Re: wiped a lobe... expensive lesson...update
[Re: 471Magnum]
#1188104
03/31/12 03:08 PM
03/31/12 03:08 PM
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Joined: May 2007
Posts: 952 Queens, N. Y.
FASTBACK340
super stock
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super stock
Joined: May 2007
Posts: 952
Queens, N. Y.
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I wiped out a Comp Cam too.... about 3 yrs. ago. Not only did my bearings look exactly the same, but the oil pump rotors were no better. I had to strip it down, tank it, and manually clean the passages. THEN proceed with machining...parts....money....time.... and tank it again and manually clean it....
And yes, my cam is a ticker too. Noisy SOB.... But ZDDP goes in every oil change. Best piece of mind.
`68 Barracuda 340-S
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Re: wiped a lobe... expensive lesson...update
[Re: 1_WILD_RT]
#1188105
03/31/12 04:21 PM
03/31/12 04:21 PM
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Joined: Jan 2003
Posts: 75,282 A gulag near you.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,282
A gulag near you.
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Quote:
Quote:
Seems like Comp Cams have had more than their share of issues...
Take a look at the issues with [censored] cams a few years back with "Team Moparts" at the Engine Masters competition...
That wasn't the cams fault , it was the block and lifter geometry.
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Re: wiped a lobe... expensive lesson...update
[Re: FASTBACK340]
#1188106
03/31/12 04:30 PM
03/31/12 04:30 PM
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Joined: Jan 2003
Posts: 75,282 A gulag near you.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,282
A gulag near you.
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Quote:
I wiped out a Comp Cam too.... about 3 yrs. ago. Not only did my bearings look exactly the same, but the oil pump rotors were no better. I had to strip it down, tank it, and manually clean the passages. THEN proceed with machining...parts....money....time.... and tank it again and manually clean it....
And yes, my cam is a ticker too. Noisy SOB.... But ZDDP goes in every oil change. Best piece of mind.
Oil pump looked bad because unfiltered oil passes thru the pump before passing thru the filter.
Last build I had my hands in had a comp XE, it lasted 7 minutes into the break in , something didn't sound right and we stopped , good thing.
Put a Comp back in it but this time it was a custom grind speced by Dwayne Porter and paid the extra to have it nitrided , it was noisy on the breakin , checked it and everything looked good. I spent extra time adjusting the preload on every lifter and the last time I heard it run it was no where near as noisey as it was.
As someone else said , Comp has a large share of the market so it's only natural to have more failures .
If I buy any more Comp flat tappet cams they will be a custom, they are ground in house, and it will be nitrided .
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Re: wiped a lobe... expensive lesson...update
[Re: NV69B7RR]
#1188107
03/31/12 04:42 PM
03/31/12 04:42 PM
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Joined: Mar 2007
Posts: 3,298 West Coast, USA
jbc426
master
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master
Joined: Mar 2007
Posts: 3,298
West Coast, USA
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Quote:
What is a good oil filter, K&N ?
I use Jomar 100% no bypass flters in my hotrod and cut them open and inspect the catchings. http://www.jomarperformance.com/pro-filter.php
They are worth looking at for "race/street" motors, but not in long drain interval, high-milage street cars.
I use Napa Golds in those.
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's 1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
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Re: wiped a lobe... expensive lesson...update
[Re: JohnRR]
#1188108
03/31/12 05:03 PM
03/31/12 05:03 PM
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Joined: Apr 2008
Posts: 1,285 Pacific NW USA
CompSyn
pro stock
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pro stock
Joined: Apr 2008
Posts: 1,285
Pacific NW USA
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Quote:
Quote:
Quote:
Seems like Comp Cams have had more than their share of issues...
Take a look at the issues with [censored] cams a few years back with "Team Moparts" at the Engine Masters competition...
That wasn't the cams fault , it was the block and lifter geometry.
Exactly, and how many 40-year-old production blocks have lifter geometry issues? From what I've been told, MANY.
Wonder if Comp takes this into account with their CAD program?
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Re: wiped a lobe... expensive lesson...update
[Re: CompSyn]
#1188109
03/31/12 08:33 PM
03/31/12 08:33 PM
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Joined: Jan 2005
Posts: 4,526 Michigan
MarkZ
Worthy
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Worthy
Joined: Jan 2005
Posts: 4,526
Michigan
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Back in 2006 I spun a lobe on a Crane with about 11,000 miles on the motor. Pretty much the same results as seen here and it required a total rebuild. For my 408 build I picked up a '91 360 roller block. No more flat tappet for me.
1987 Fifth Avenue - 512/518/D60
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Re: wiped a lobe... expensive lesson...update
[Re: MarkZ]
#1188110
04/04/12 10:38 PM
04/04/12 10:38 PM
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Joined: Jan 2003
Posts: 3,719 Space Station #5
471Magnum
OP
master
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OP
master
Joined: Jan 2003
Posts: 3,719
Space Station #5
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After several days delay due to a dead battery and other unrelated issues, I finally had the chance to fire the motor tonight.
Once I got the timing close, it fired right off. Cam break-in was uneventful. About halfway through the alternator started howling, due to a bad bearing I'm guessing. No big deal but it was definitely startling.
The skies opened up during the break-in soaking the roads, so unfortunately there was no test drive tonight.
Need to hunt down a single groove pulley alternator now...
-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
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Re: wiped a lobe... expensive lesson...update
[Re: 471Magnum]
#1188111
04/04/12 11:59 PM
04/04/12 11:59 PM
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Joined: Aug 2008
Posts: 1,568 Omaha, Nebraska
Scott Carl
pro stock
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pro stock
Joined: Aug 2008
Posts: 1,568
Omaha, Nebraska
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Jeeze, guys! You got me sweating bullets now I am in the process of rebuilding a 318 with a mild cam upgrade. Guess what brand I bought?? I got Comp's 20-221-3, and I figured I go the whole brand loyal route and ordered Summits kit; cam, lifters, springs, keepers etc. My machinist told me about the importance of good oil and additives and such and recommended a few brands. This is a near stock rebuild but my first with a cam upgrade. Wish me luck Scott
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Re: wiped a lobe... expensive lesson...update
[Re: astjp2]
#1188113
04/05/12 02:47 AM
04/05/12 02:47 AM
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Joined: Jan 2003
Posts: 27,558 So Cal
autoxcuda
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,558
So Cal
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I've got 2826 miles on my 416 stroker. Comp XE274-solid. Using the standard Comp solid lifters. No Issues. Edelbrock heads have standard Edelbrock valve springs. I have the Comp Magnum roller rocker that come bronze bushed. Broke in motor using the Comp cam lube. Never used it since. 1st two oil changes used 15-w40 Rotella and Justice Brothers Engine Treatment (ET/33P) to replace the Zinc. Had plenty of oil pressure and that 15-w40 is sort of noisy so I now run Castrol GTX 10-w30 from Walmart, again with JB Engine Treatment (ET/33P). No issues. I've run the car at two all day road course track events, one autocross, and cruise RPM between 3600-3800. Car will see high rpm down long straight all the way to 6,000 rpm. I took the car tonight to the grocery store 4 miles and back. Shifted at 5,000 only once . It's my only running car I own (have another vehicle provided by/for work). So it gets short trips also.
Last edited by autoxcuda; 04/05/12 02:50 AM.
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Re: wiped a lobe... expensive lesson...update
[Re: Scott Carl]
#1188114
04/05/12 07:39 AM
04/05/12 07:39 AM
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Joined: Jan 2003
Posts: 3,719 Space Station #5
471Magnum
OP
master
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OP
master
Joined: Jan 2003
Posts: 3,719
Space Station #5
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BTW... About 5/8 turn lifter preload this time. No cam noise.
I wouldn't have thought this cam would run quieter (same duration, more lift). Maybe it was the lifters.
-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
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Re: wiped a lobe... expensive lesson...update
[Re: Challenger 1]
#1188116
04/05/12 04:45 PM
04/05/12 04:45 PM
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Joined: Feb 2008
Posts: 992 Simi Valley, CA
MoparJ
super stock
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super stock
Joined: Feb 2008
Posts: 992
Simi Valley, CA
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I have about 31k on my .060 over 318 since I built it about 3 yrs ago. Running an XE268H with the supplied Comp lifters and springs. Its a noisy SOB, especially when cold and at engine speeds of 2300-2700 rpm, but so far, so good. Used Rotella 15w-40 at break in, with Comp Cams break in lube and actually had the distributor gear off a bit, so it didnt start right away. Had one lifter collapse at 7000 miles, so I replaced it with a stock replacement type. Ok since then, but one on the left bank has bled down to the point where it wouldnt pump up without some coaxing a few times (used some Marvel Mystery oil directly into valve cover while running to pump it up). I will probably need to go in and replace all of the crappy Comp lifters as piece of mind before too long.
Runs great, excellent power band and decent low end torque. Still runs high 13s with 3.23s. Using 15w40 Chevron Delo oil, since my dad gets it for free, along with a bottle of STP 4 cyl oil treatment for added zinc. Oil changes are done every 1500-2000 miles with a Wix oil filter.
2016 Ram 1500 Crew Cab: 5.7, 65RFE, 4.56 gears with locker, Hemifever tuned, AFE intake, 87mm throttle body, JBA headers, 3" Flowmaster exhaust, split to dual 2.5" exits. 13.57 best ET so far.
Searching for new A or B Body Project!
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Re: wiped a lobe... expensive lesson...update
[Re: 471Magnum]
#1188118
04/06/12 12:47 PM
04/06/12 12:47 PM
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Joined: Jan 2003
Posts: 642 New Jersey
Craig
mopar
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mopar
Joined: Jan 2003
Posts: 642
New Jersey
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471Magnum, sounds like its fixed, good for you. But I'm wondering, were the valve guides OK, not sticking? The problem occurred after you changed heads, and you said there was an oil use problem in that cyl, and you thought you had bad preload. I'm thinking the problem may have started from a bad guide in the new head, hopefully that's not still an issue...
67 Dart, 426 Hemi, 9.23/145mph, 3400lbs, footbraked, owned since 1982
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Re: wiped a lobe... expensive lesson...update
[Re: Craig]
#1188119
04/06/12 03:27 PM
04/06/12 03:27 PM
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Joined: Jan 2003
Posts: 3,719 Space Station #5
471Magnum
OP
master
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OP
master
Joined: Jan 2003
Posts: 3,719
Space Station #5
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I didn't disassemble the heads. I put my trust in IMM's quality.
I don't think it was a preload issue. The adjuster on that rocker was set no different than any of the others. That said, they all might have been too tight and that one was just first to go. Or it may have been my choice of oil.
Oil consumption was probably due to the intake lobe being wiped. There was pretty much no valve lift remaining. Without the valve opening, it was pulling a bunch of vacuum in that cylinder and sucking oil past the rings. That's one theory anyway. Similar thing happened when I lost an intake rocker on a 440 several year ago.
This cam is much quieter than I ever recall the other being. It's a very similar grind to the old one (XE274H vs XE275HL), albeit with more lift. I expected more noise if anything. Makes me wonder if there may have been an issue from day one with the old set up that I never noticed.
-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
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