Moparts Forums >> Moparts Question and Answer

Pages: 1 | 2 | >> (show all)
471Magnum
master


Reged: Jan 19 2003
Loc: Space Station #5
wiped a lobe... expensive lesson...update
      #7095872 - Wed Feb 29 2012 06:47 AM Attachment (240 downloads)

This stroker motor of mine has had its share of issues. Most recently, I've noticed some increasing tappet noise. I decide to remove the intake for inspection.

Found the #5 intake lifter to be partially digested.

This motor probably has less than 2000 miles on it. I've had the intake off several time along the way and each time inspected the lifters. This is a recent development.

Most recently, I replaced/upgraded the heads. Again, I noticed no cam or lifter wear while I had it apart. One thing I neglected to do after changing the oil this last time was to pour in the Comp Cams additive I've been using. In less that 200 miles, this is the result.

For the record, the cam is (was) a Comp Cams XE274HL. Nothing too crazy. Valve springs are beehives from IMM. Not sure of the pressures, but probably not much more than the double springs I ran on the old heads. Running iron adjustable rockers.

Right now I'm going with the theory that its an oil failure, with maybe a chinese lifter factor mixed in.

I haven't decided on my replacement plan yet. If I stick with Comp Cams, I'll probably step up a bit to a XE275HL. As far as lifters go, I'm not sure.

One thing for certain, I'm about to pay my "stupid tax".



--------------------
-Jim
I can fix it... my old man is a television repairman.
He's got the ultimate set of tools... I can fix it.

Currently Mopar-less

Edited by 471Magnum (Wed Mar 07 2012 03:03 PM)


Post Extras: Print Post   Remind Me!   Notify Moderator  
Challenger 1
I live here!


Reged: Feb 05 2005
Loc: Cincinnati, Ohio
Re: wiped a lobe... expensive lesson [Re: 471Magnum]
      #7095880 - Wed Feb 29 2012 06:58 AM

That sucks big time, I'm so sorry.
I would lean toward incorrect valve lash/preload.
It's so easy to get it wrong and is easy to get right when first building the motor. I do it with the intake off so I can see the lifter plunger so I can insure the proper preload at the lifter.

Good luck with your rebuild.

--------------------


Post Extras: Print Post   Remind Me!   Notify Moderator  
Rapid340
mopar addict


Reged: Sep 06 2004
Loc: oberlin, Ohio
Re: wiped a lobe... expensive lesson [Re: 471Magnum]
      #7095884 - Wed Feb 29 2012 07:02 AM

Sorry to hear, what oil did you use?

Also, it is a really good habit to never remove more than one lifter at a time when inspecting them or transfering to a lifter box for storage. I'm not saying you did anything wrong but I know if I am not careful all I need to do is misplace one to have issues.

--------------------

Jeff Patterson 71 Duster 340, Factory Appearing
11.000 122.3 MPH on 6 in. M&H Volkswagen tires.


Intelligence? http://www.youtube.com/watch?v=cpM76ymlnbA


Post Extras: Print Post   Remind Me!   Notify Moderator  
471Magnum
master


Reged: Jan 19 2003
Loc: Space Station #5
Re: wiped a lobe... expensive lesson [Re: Challenger 1]
      #7095888 - Wed Feb 29 2012 07:08 AM

I checked the pre-load a couple of times prior to this. That cam as always been a bit noisy. It's certainly possible that could be the cause. I'll definitely have the opportunity to set it with the intake off this next time.

It's also probably worth mentioning that the #5 cylinder also seems to have an oil consumption problem. The plug fouled-up with oil. I did a compression check to find that cylinder 20 psi lower than the others. That could be attributable to the reduced intake lift. Before I found the wiped lobe, I was leaning towards re-ringing that cylinder.

--------------------
-Jim
I can fix it... my old man is a television repairman.
He's got the ultimate set of tools... I can fix it.

Currently Mopar-less


Post Extras: Print Post   Remind Me!   Notify Moderator  
Dodgem
master


Reged: Mar 21 2008
Loc: Ontario, Canada
Re: wiped a lobe... expensive lesson [Re: 471Magnum]
      #7095891 - Wed Feb 29 2012 07:15 AM

Get good lifters and make sure you do not preload to much. Hughes offers
Cryogenic treatment for the lifters and probably the cams too. pay me now or pay me later.
My be time to step up to a hydraulic roller.

For sure always use a zinc additive!!!


Post Extras: Print Post   Remind Me!   Notify Moderator  
lewtot184
top fuel


Reged: Jun 09 2008
Loc: usa
Re: wiped a lobe... expensive lesson [Re: Dodgem]
      #7095919 - Wed Feb 29 2012 07:46 AM

check the seat pressure. some of those beehives have a lot of seat pressure for street flat tappet cam.

Post Extras: Print Post   Remind Me!   Notify Moderator  
MLR426
Hair today, gone tomorrow


Reged: Aug 17 2005
Loc: ILL
Re: wiped a lobe... expensive lesson [Re: lewtot184]
      #7095962 - Wed Feb 29 2012 08:16 AM


James,

Brad Penn or equivalent oil only with zinc and phosphur in it. If your using an additive what do you think is going on inside the engine until the additive is getting mixed in with the oil ?? It's also a gamble when adding the additive after the fact.

logan426 martin


Post Extras: Print Post   Remind Me!   Notify Moderator  
A57_RT
Parts Problem


Reged: Jan 12 2012
Re: wiped a lobe... expensive lesson [Re: MLR426]
      #7096005 - Wed Feb 29 2012 08:50 AM

With it that far gone, didnt it show signs of issues long before this point???

Ive run old junkers for years that ticked, knocked and the worst lifter I ever saw was a pushed in bottom, thats ugly....

Good luck on the fix though Its got to be bad parts these days, luck of the draw???

I say this simply because luckly ive not had this happpen ever, just a good stash of old stp and std breakin like we all do.

Im still trying to grasp the concept of metal on metal when most dont consider a cam a wear item.


Post Extras: Print Post   Remind Me!   Notify Moderator  
DAYCLONAź
Badge Bunny


Reged: Dec 10 2007
Loc: Mass
Re: wiped a lobe... expensive lesson [Re: 471Magnum]
      #7096006 - Wed Feb 29 2012 08:51 AM

I've seen, HAD, and heard too many horror stories with Comp Cams to warrant any future involvement with purchasing any of their cams....might be another problem, but IMHO I'd suspect the cam

Mike


Post Extras: Print Post   Remind Me!   Notify Moderator  
471Magnum
master


Reged: Jan 19 2003
Loc: Space Station #5
Re: wiped a lobe... expensive lesson [Re: A57_RT ]
      #7096122 - Wed Feb 29 2012 10:17 AM

I ran this motor a bunch before this. Had a saga with the heads leaking through the guides that took a long time to resolve, and probably masked and distracted me from this issue. Finally installed the RHS heads to take care of that.

That being said, I inspected the lifters on several occasions prior when I had the motor torn down for the head issues. No wear was noted.

It's always have had a lot of lifter noise. Tweaked the preload in an attempt to quiet it down some to no avail. It's possible that I over did it.

I used plenty of break in lube. The Comp Cams additive was at oil changes... but not this last one.

Biggest concern now is lifter trash and potential bearing damage.

As far as what cam and lifter package goes in next, I'm not sure. It'll will likely be a similar grind as I really liked the performance. I'll probably be talking with Hughes this weekend in Indy.

--------------------
-Jim
I can fix it... my old man is a television repairman.
He's got the ultimate set of tools... I can fix it.

Currently Mopar-less


Post Extras: Print Post   Remind Me!   Notify Moderator  
JohnRR



Reged: Jan 20 2003
Loc: U.S.S.A.
Re: wiped a lobe... expensive lesson [Re: 471Magnum]
      #7096156 - Wed Feb 29 2012 10:35 AM

Quote:



Biggest concern now is lifter trash and potential bearing damage.






There is no potential damage, it's a definite with that much worn off that lifter , I'm sure the cam looks as bad.

Metal chips on the piston skirts in the vicinity of that lobe and the oil pump will be scared because it sees unfiltered oil.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Challenger 1
I live here!


Reged: Feb 05 2005
Loc: Cincinnati, Ohio
Re: wiped a lobe... expensive lesson [Re: JohnRR]
      #7096169 - Wed Feb 29 2012 10:40 AM

Quote:

Quote:



Biggest concern now is lifter trash and potential bearing damage.






There is no potential damage, it's a definite with that much worn off that lifter , I'm sure the cam looks as bad.

Metal chips on the piston skirts in the vicinity of that lobe and the oil pump will be scared because it sees unfiltered oil.




Yup it's gonna be neccessary to replace all bearings, maybe rings and more.
Every inch and passage of the block, crank, rods and pistons will need to be cleaned.

--------------------


Post Extras: Print Post   Remind Me!   Notify Moderator  
471Magnum
master


Reged: Jan 19 2003
Loc: Space Station #5
Re: wiped a lobe... expensive lesson [Re: 471Magnum]
      #7096266 - Wed Feb 29 2012 11:54 AM

I'll start tearing into it further tonight. We'll see what I find when I pull a few caps.

The cam lobe is definitely damaged. I haven't turned the motor over to inspect the entire lobe, but yeah, the cam is toast, no doubt.

I'm not counting on getting lucky.

--------------------
-Jim
I can fix it... my old man is a television repairman.
He's got the ultimate set of tools... I can fix it.

Currently Mopar-less


Post Extras: Print Post   Remind Me!   Notify Moderator  
rave_12000
enthusiast


Reged: Jan 03 2007
Loc: kansas city, mo
Re: wiped a lobe... expensive lesson [Re: 471Magnum]
      #7096527 - Wed Feb 29 2012 02:19 PM

I lost a completely rebuilt 340 after 12 miles. Chalked it up to oil pump failure? Spun a main bearing and there was trash all over the motor. I would think that bearing material is softer than that of a litter. In my case all of the crank journals were scored. You might have to turn yours.

Post Extras: Print Post   Remind Me!   Notify Moderator  
Frankenduster
Sloppy drunk and stupid is no way to go thru life


Reged: Feb 15 2010
Loc: Granite Bay CA
Re: wiped a lobe... expensive lesson [Re: A57_RT ]
      #7096586 - Wed Feb 29 2012 02:58 PM

These cams are a bit noisier than other types. I wasted 2 XE285s in my 493. I also figure that it was due to my ignorance about inadequate Zinc protection. I've since learned plenty on the subject, but there is always room for improvement.
Comp now offers the "Pro Plasma" treatment. Its a sort of surface hardening that along with proper oil, should last a long time. I'm thinking of switching back to that 285 since I liked the performance ans streetability of it.
Sorry for your troubles. Broken parts are a hard lesson to learn, huh?


Post Extras: Print Post   Remind Me!   Notify Moderator  
JohnRR



Reged: Jan 20 2003
Loc: U.S.S.A.
Re: wiped a lobe... expensive lesson [Re: Frankenduster]
      #7096628 - Wed Feb 29 2012 03:18 PM

Quote:

These cams are a bit noisier than other types. I wasted 2 XE285s in my 493. I also figure that it was due to my ignorance about inadequate Zinc protection. I've since learned plenty on the subject, but there is always room for improvement.
Comp now offers the "Pro Plasma" treatment. Its a sort of surface hardening that along with proper oil, should last a long time. I'm thinking of switching back to that 285 since I liked the performance ans streetability of it.
Sorry for your troubles. Broken parts are a hard lesson to learn, huh?




is that pro plasma the same as the nitride they offer to the tune of $150 EXTRA ???


Post Extras: Print Post   Remind Me!   Notify Moderator  
471Magnum
master


Reged: Jan 19 2003
Loc: Space Station #5
Re: wiped a lobe... expensive lesson [Re: Frankenduster]
      #7097059 - Wed Feb 29 2012 06:19 PM

I don't necessarily think it's the cam that's noisy, but the lifters that come with the kits. I'll be ordering a set of Topline Hylifts for the next cam.

I'm in the process of pulling the pan now. No obvious junk found when I drained the oil, but I didn't expect to find anything. Trying to bust the drag link from the idler arm. Got to feeling weak swinging the mini sledge. Decided I'd better take a dinner break. LOL

--------------------
-Jim
I can fix it... my old man is a television repairman.
He's got the ultimate set of tools... I can fix it.

Currently Mopar-less


Post Extras: Print Post   Remind Me!   Notify Moderator  
bigtail
mopar


Reged: Jan 01 2012
Loc: NE
Re: wiped a lobe... expensive lesson [Re: 471Magnum]
      #7097228 - Wed Feb 29 2012 07:35 PM

I second the use of Hyd rollers. You would have been bucks and headaches ahead at this point. Be aware, Comp Cams had had catastruaphic failures with their roller hyd lifters. Maybe time to change to another brand. Do a google search.

--------------------
This page is made up completely of recycled electrons.


Post Extras: Print Post   Remind Me!   Notify Moderator  
JohnRR



Reged: Jan 20 2003
Loc: U.S.S.A.
Re: wiped a lobe... expensive lesson [Re: 471Magnum]
      #7097422 - Wed Feb 29 2012 08:52 PM

Quote:

I don't necessarily think it's the cam that's noisy, but the lifters that come with the kits. I'll be ordering a set of Topline Hylifts for the next cam.






It's the cam , XE have fast ramps and the valves tend to slam shut.


Post Extras: Print Post   Remind Me!   Notify Moderator  
JohnRR



Reged: Jan 20 2003
Loc: U.S.S.A.
Re: wiped a lobe... expensive lesson [Re: JohnRR]
      #7097432 - Wed Feb 29 2012 08:57 PM Attachment (160 downloads)

Here's the rod bearings from a 360 with HOURS of run time , car was never driven other than up and down the driveway, lifter not nearly as bad as yours .

Post Extras: Print Post   Remind Me!   Notify Moderator  
471Magnum
master


Reged: Jan 19 2003
Loc: Space Station #5
Re: wiped a lobe... expensive lesson [Re: JohnRR]
      #7097555 - Wed Feb 29 2012 10:08 PM

Pulled the 2 and 4 main caps. Bearing halves looked pretty much like JohnRR's pic above. Maybe not quite as bad, but definitely scored.

No scoring on the crank though from what I've seen this far.

Guess the motor is coming out.

--------------------
-Jim
I can fix it... my old man is a television repairman.
He's got the ultimate set of tools... I can fix it.

Currently Mopar-less


Post Extras: Print Post   Remind Me!   Notify Moderator  
Frankenduster
Sloppy drunk and stupid is no way to go thru life


Reged: Feb 15 2010
Loc: Granite Bay CA
Re: wiped a lobe... expensive lesson [Re: JohnRR]
      #7097656 - Wed Feb 29 2012 11:24 PM

Quote:








It's the cam , XE have fast ramps and the valves tend to slam shut.




I meant to write this very thing! Forgive me John, I'm starting to emulate your way of thinking!
Summit warrantied the first cam when it went bad. After the second one crapped out, I felt that I was pushing my luck so I just let it slide. I slipped back in a cam referred as THE Dinosaur.... the Mopar Performance 292/509. In the time since, Comp began offering that hardening process for their product line. I agree that a Hydraulic roller cam would be a better choice in terms of reliability, but the cost is just too hard to take! I'd have to sell a few parts or scrap a few cars to feel okay about spending $1000 for a cam swap!


Post Extras: Print Post   Remind Me!   Notify Moderator  
64Post
Whiney, slow internet crybaby


Reged: Aug 18 2003
Loc: all over
Re: wiped a lobe... expensive lesson [Re: JohnRR]
      #7097668 - Wed Feb 29 2012 11:38 PM

Quote:

Quote:

I don't necessarily think it's the cam that's noisy, but the lifters that come with the kits. I'll be ordering a set of Topline Hylifts for the next cam.






It's the cam , XE have fast ramps and the valves tend to slam shut.




I think my MM lobe solid might have been too much for the street.


Post Extras: Print Post   Remind Me!   Notify Moderator  
MLR426
Hair today, gone tomorrow


Reged: Aug 17 2005
Loc: ILL
Re: wiped a lobe... expensive lesson [Re: JohnRR]
      #7097919 - Thu Mar 01 2012 06:57 AM

Quote:

Quote:

I don't necessarily think it's the cam that's noisy, but the lifters that come with the kits. I'll be ordering a set of Topline Hylifts for the next cam.






It's the cam , XE have fast ramps and the valves tend to slam shut.




Thats correct and creates,and resonates the noise.
Johnson Hylift manufactures lifters for many companies, At Radiac Abrasive we make grinding wheels for them.

logan426


Post Extras: Print Post   Remind Me!   Notify Moderator  
rbstroker
super stock


Reged: Sep 24 2006
Loc: West Tennessee
Re: wiped a lobe... expensive lesson [Re: 471Magnum]
      #7097951 - Thu Mar 01 2012 07:25 AM

I wonder if the composite lifters available through 4secondsflat would be worth considering?

Post Extras: Print Post   Remind Me!   Notify Moderator  
Moparnut426



Reged: Mar 07 2007
Loc: Finally a HUSKER again
Re: wiped a lobe... expensive lesson [Re: MLR426]
      #7097963 - Thu Mar 01 2012 07:32 AM

How old it the set up? The reason I ask is there was a run of "bad" lifters going around a few years ago. Too bad you got bit, there is far too many variables to know what caused it now. Hope ya dont have too many issues when ya dig in further.

Good luck, and price a hydrailic roller, it hurts....



--------------------
Light travels faster than sound. This is why some people appear bright until you hear them speak.





Post Extras: Print Post   Remind Me!   Notify Moderator  
Pale_Roader
The correct spelling is "of." Just passing that along.


Reged: Jan 21 2005
Loc: the frozen wastes...
Re: wiped a lobe... expensive lesson [Re: Moparnut426]
      #7099496 - Fri Mar 02 2012 04:13 AM


Well now you got me wondering about using those 10 year old (new in box) Comp lifters and springs with a Hughes Whiplash cam...

Why cant this stuff just be simple...???


Post Extras: Print Post   Remind Me!   Notify Moderator  
JohnRR



Reged: Jan 20 2003
Loc: U.S.S.A.
Re: wiped a lobe... expensive lesson [Re: Pale_Roader]
      #7099747 - Fri Mar 02 2012 09:40 AM

Quote:


Well now you got me wondering about using those 10 year old (new in box) Comp lifters and springs with a Hughes Whiplash cam...

Why cant this stuff just be simple...???




10yrs old would put the lifters before the bad ones got dumped into the system , but you want to check and make sure they spin well first .


Post Extras: Print Post   Remind Me!   Notify Moderator  
471Magnum
master


Reged: Jan 19 2003
Loc: Space Station #5
Re: wiped a lobe... expensive lesson [Re: JohnRR]
      #7099944 - Fri Mar 02 2012 11:56 AM

Cam was purchased about a year ago.

Lifters were definitely spinning before the accelerated wear started. I went to extra effort cleaning out the bores and test fitting the lifters at assembly. Judging from the wear pattern, it even appears it continued to spin after the wear started. It would have wiped a lot sooner otherwise. I'm pretty sure botched preload was the culprit.

Picking the next set of lifters right off the proverbial tree. Ordering direct from Topline Hylift.

--------------------
-Jim
I can fix it... my old man is a television repairman.
He's got the ultimate set of tools... I can fix it.

Currently Mopar-less


Post Extras: Print Post   Remind Me!   Notify Moderator  
471Magnum
master


Reged: Jan 19 2003
Loc: Space Station #5
Re: wiped a lobe... expensive lesson [Re: 471Magnum]
      #7099951 - Fri Mar 02 2012 11:59 AM

I should mention that the set of Comp Cam lifters I just received have no country of origin listed on the packaging. They're going back un-opened.

--------------------
-Jim
I can fix it... my old man is a television repairman.
He's got the ultimate set of tools... I can fix it.

Currently Mopar-less


Post Extras: Print Post   Remind Me!   Notify Moderator  
scatpacktom
super gas


Reged: Jan 26 2003
Loc: Phila Pa
Re: wiped a lobe... expensive lesson [Re: 471Magnum]
      #7099979 - Fri Mar 02 2012 12:17 PM

I would measure the lifter bores

--------------------
F.A.S.T T/A Challenger 340 six pack 4sp 11.48 at 123 on G60 15s
F.A.S.T 71 Super Bee 440 six pack 4sp 11.49 at 122.99 on G70 14s
Pure Stock 70 Duster 340 4 sp 13.15 at 105.76 on F70 14s


Post Extras: Print Post   Remind Me!   Notify Moderator  
70Cuda383Moderator
Kaptain Kuda


Reged: Oct 07 2003
Loc: Marysville, O-H-I-O
Re: wiped a lobe... expensive lesson [Re: scatpacktom]
      #7099997 - Fri Mar 02 2012 12:28 PM

don't be alarmed when you fire up the XE275HL cam...it's a noisy one too.

I was worried at first when I heard mine, sounded like a sewing machine! but, 4,000 street miles and it never skipped a beat.

--------------------


Post Extras: Print Post   Remind Me!   Notify Moderator  
471Magnum
master


Reged: Jan 19 2003
Loc: Space Station #5
Re: wiped a lobe... expensive lesson...update [Re: 471Magnum]
      #7107990 - Wed Mar 07 2012 03:09 PM

Took the day off today to pull the motor and tear it down.

Pretty much have finished the tear down. All that is left is pulling the crank.

Removed the pistons and rods to find those journals lightly scoured. I think it will clean up with a polish though.

Bigger concern is the piston skirts and bores. Some light scuffing there. Not sure how much would be considered acceptable. I'll try to post a photo later. Hopefully they are salvageable.

Plan is to get the block and crank to the machine shop tomorrow.

--------------------
-Jim
I can fix it... my old man is a television repairman.
He's got the ultimate set of tools... I can fix it.

Currently Mopar-less


Post Extras: Print Post   Remind Me!   Notify Moderator  
Challenger 1
I live here!


Reged: Feb 05 2005
Loc: Cincinnati, Ohio
Re: wiped a lobe... expensive lesson...update [Re: 471Magnum]
      #7108006 - Wed Mar 07 2012 03:18 PM

Did you tear it apart like I did the last time I had to do that?


__


Post Extras: Print Post   Remind Me!   Notify Moderator  
JohnRR



Reged: Jan 20 2003
Loc: U.S.S.A.
Re: wiped a lobe... expensive lesson...update [Re: Challenger 1]
      #7108023 - Wed Mar 07 2012 03:28 PM

Quote:

Did you tear it apart like I did the last time I had to do that?


__




Hopefully you swept before laying the pistons out ...


Post Extras: Print Post   Remind Me!   Notify Moderator  
471Magnum
master


Reged: Jan 19 2003
Loc: Space Station #5
Re: wiped a lobe... expensive lesson...update [Re: 471Magnum]
      #7108192 - Wed Mar 07 2012 05:48 PM Attachment (135 downloads)

Here is a picture of the #7 bore. Seems to be the worst of them.

--------------------
-Jim
I can fix it... my old man is a television repairman.
He's got the ultimate set of tools... I can fix it.

Currently Mopar-less


Post Extras: Print Post   Remind Me!   Notify Moderator  
AndyF
moparts guru


Reged: Jan 20 2003
Loc: Oregon
Re: wiped a lobe... expensive lesson...update [Re: 471Magnum]
      #7108247 - Wed Mar 07 2012 06:14 PM

Chewing up a cam lobe is a real bummer. I lost my original 426W engine years ago that way. The lobe material went into the oil pump and then that sheared the pump drive and once oil pressure went away the rod bearings spun. You caught your issue sooner than I did!

I wrote an article on the subject last year. It is in the tech archives on this board if you want to check it out. I talked to a bunch of people in the industry and tried to find all the newest parts on the market to help flat tappet cams live. I think it can be done if you use the right oil, lifters, springs, coatings, etc.

http://www.moparmax.com/tech/2011/vi_8-flat-1.html

Edited by AndyF (Wed Mar 07 2012 06:20 PM)


Post Extras: Print Post   Remind Me!   Notify Moderator  
471Magnum
master


Reged: Jan 19 2003
Loc: Space Station #5
Re: wiped a lobe... expensive lesson...update [Re: JohnRR]
      #7108262 - Wed Mar 07 2012 06:29 PM

Quote:


Hopefully you swept before laying the pistons out ...




The carbon build-up acts as a protective coating.

--------------------
-Jim
I can fix it... my old man is a television repairman.
He's got the ultimate set of tools... I can fix it.

Currently Mopar-less


Post Extras: Print Post   Remind Me!   Notify Moderator  
451Mopar
mopar addict


Reged: May 19 2008
Loc: Aurora, Colorado
Re: wiped a lobe... expensive lesson...update [Re: 471Magnum]
      #7108491 - Wed Mar 07 2012 08:34 PM

sorry to hear that. My 360 wiped a cam a few years back. It ran fine for several years, and I would always use Mobile-1 in it. The cam lifter failure was right about the time all the companies changed to the "new" lower ZDDP additives (maybe 10 years ago?) The metal from the wiped cam and lifter made a mess of the oil pump, bearings and some cylinder wall scratches. I was able to have the machine shop re-hone the cylinders, and I rebuilt it with new bearings, rings, and a slightly hotter cam. I quit using Mobile-1 and only use the "Race" oil in the engine.

Post Extras: Print Post   Remind Me!   Notify Moderator  
Rick_Ehrenberg
super street


Reged: Sep 22 2003
Loc: Marlboro, NY, USA
Re: wiped a lobe... expensive lesson...update [Re: 471Magnum]
      #7108885 - Thu Mar 08 2012 06:22 AM

Complicated subject!

Basically, over the last 10-15 years, there has been a "perfect storm" of conditions contributing to this widespread problem. The three main ones:

> Detroit totally stopped using flat tappet camshaft, resulting in a loss of dependable, low-cost tappet and cam-blank suppliers

> The guys who knew how to make the above "for generations" are dying off

> ZDDP levels in oils have slowly been reduced. No law against ZDDP, but it isn't good for cats, and the EPA forces automakers to give long "low emissions" warranties

The fixes? Also multi-prong:

> Use oil with enough ZDDP (EG: Mobil 1 15W50, etc.) or an additive

> Use lifters with either a ceramic-composite face, or the 0.012" laser-drilled hole in the face

> Avoid long periods of idling

> Don't go crazy with valve spring pressure. If "enough is enough", "too much" ISN'T better!

> And, most important: Assure that your new engine fires INSTANTLY (timing right, float bowls filled, shot of ether, etc.) and doesn't see under 2,500 RPM for the first 20 minutes or so.

Rick


Post Extras: Print Post   Remind Me!   Notify Moderator  
Pages: 1 | 2 | >> (show all)



Extra information
10 registered and 61 anonymous users are browsing this forum.

Moderator:  moparts, SanityLost, tboomer, LTDan, 70Cuda383, Hotwheelsjr, not_a_charger, Eric, Al_Alguire 

Print Topic

Forum Permissions
      You cannot start new topics
      You cannot reply to topics
      HTML is disabled
      UBBCode is enabled

Rating:
Topic views: 6451

Rate this topic

Jump to

Contact Info | Privacy statement main index

Powered by UBB.threads™ 6.5.2