engine inspection
#2007076
02/07/16 12:10 AM
02/07/16 12:10 AM
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Joined: Nov 2004
Posts: 3,518 pacific northwest
Stroker Scamp
OP
master
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OP
master
Joined: Nov 2004
Posts: 3,518
pacific northwest
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I am going to pull my motor in the scamp, the engine was built in 2007 so it has been together for a while. I do not consistently race every weekend but I think its time to open it up and take a look. the car has seemed to slow a bit over the years. Any tips on a list of things to check on would be of a great help. Thanks, Mike
footbrake N/A SB 408 Scamp 10.10 @ 132 street/strip 73 Duster 340 street strip 12.79 @ 105
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Re: engine inspection
[Re: Stroker Scamp]
#2007089
02/07/16 12:30 AM
02/07/16 12:30 AM
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Joined: Dec 2004
Posts: 10,558 Rittman Ohio
fourgearsavoy
I Live Here
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I Live Here
Joined: Dec 2004
Posts: 10,558
Rittman Ohio
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Leak down test before you disassemble it. At the very least do a compression check wet and dry. Gus
64 Plymouth Savoy 493 Indy EZ's by Nick at Compu-Flow 5-Speed Richmond faceplate Liberty box Dana 60
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Re: engine inspection
[Re: fourgearsavoy]
#2007226
02/07/16 05:40 AM
02/07/16 05:40 AM
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Joined: May 2003
Posts: 1,751 Graham, WA
Polarapete
top fuel
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top fuel
Joined: May 2003
Posts: 1,751
Graham, WA
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Leak down test before you disassemble it. At the very least do a compression check wet and dry. Gus I have a trick leak down tester that I have never used. Send me a PM and you can borrow it.
1986 Dodge Ramcharger 440 2wd, Bracket Racer Under Construction 1998 Ram 2500 QuadCab, new daily driver. 2008 Honda Element 2014 Carry-On 7x14 Cargo Trailer
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Re: engine inspection
[Re: Polarapete]
#2007400
02/07/16 03:44 PM
02/07/16 03:44 PM
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Joined: Nov 2004
Posts: 3,518 pacific northwest
Stroker Scamp
OP
master
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OP
master
Joined: Nov 2004
Posts: 3,518
pacific northwest
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Leak down test before you disassemble it. At the very least do a compression check wet and dry. Gus I have a trick leak down tester that I have never used. Send me a PM and you can borrow it. I plan on the leak down, checking the bearings on the rods and crank, I do have a leak down tester (thanks for the offer Pete) going to check the roller lifters for anything out of the ordinary and replace the valve springs. not sure what else to look for though
footbrake N/A SB 408 Scamp 10.10 @ 132 street/strip 73 Duster 340 street strip 12.79 @ 105
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Re: engine inspection
[Re: Stroker Scamp]
#2007439
02/07/16 04:55 PM
02/07/16 04:55 PM
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crabman173
Unregistered
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crabman173
Unregistered
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Most fresh ups are not needed--we get lots of drag engines in every other season and they would have easy kept going--the Main things are
The roller lifters--excessive spring pressures or not enough pressure kills lifter axle bearings--these need to come out--go on Egay and be replaced pretty often if you race lots of week ends--all depends on what level $$ of lifter you start with
Timing chains--stutter boxes Kill chains--no stutter no worry--stutter--replace chain
Valve springs--check them --if good keep on keeping on--
Bearings--almost never
Rings--I see lots of bracket engines with several years on them--sure they can use a hone and some fresh rings --they may not be as sharp as new but hey..they are not going to hurt a thing--so you run a tenth slower than new who cares?
Many combos can go lots more races than owners think long as lifter wheels stay on lifters
Most fresh ups get plate hone , rings, new bearings , timing set, lifters ( or lifter check),springs, valve job touch up, crank polish, new stem seals and maybe a new set valve locks and away they go I just did a 496 BB that had 5 years of points racing on it and it really could have gone a couple more except timing chain was slacko from stutter--other than that it really would have gone like the ever ready bunny
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Re: engine inspection
[Re: greendart408]
#2007743
02/08/16 02:11 AM
02/08/16 02:11 AM
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Joined: Nov 2004
Posts: 3,518 pacific northwest
Stroker Scamp
OP
master
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OP
master
Joined: Nov 2004
Posts: 3,518
pacific northwest
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His motor has slowed a bunch, something is up, be it parts in the motor worn, which as little as you use it I find that hard to believe, or your tune up is off. Mike, do you loosen rockers in your yrs of no use or atleast turn motor over frequently? I think the valve springs are the culprit, there have been some times I have not backed the rockers off but I have always turned the motor over tune has always been a couple jets either way since day 1 motor will be out on Monday to take a look
footbrake N/A SB 408 Scamp 10.10 @ 132 street/strip 73 Duster 340 street strip 12.79 @ 105
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Re: engine inspection
[Re: Stroker Scamp]
#2007894
02/08/16 01:13 PM
02/08/16 01:13 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Check the leak down and do a compression check.. if the valve springs are weak you might be pulling the heads for a valve job.. if your gonna pull the engine then check everything EDIT If you took a leak down and compression check when it was new you can see if they dropped much and if you checked the springs when new you can check them also
Last edited by MR_P_BODY; 02/08/16 01:21 PM.
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Re: engine inspection
[Re: Stroker Scamp]
#2007903
02/08/16 01:33 PM
02/08/16 01:33 PM
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Joined: Mar 2006
Posts: 9,882 MI, usa
dvw
master
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master
Joined: Mar 2006
Posts: 9,882
MI, usa
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I compression check when fresh. Then I have a known number. Same with springs. Get a on the car checker. They're not perfect but they will show a change. With these two tests you'll have a pretty good idea if there was something in the motor slowing it down. With the heads diasembled you can get a pretty good look at the seats and valves. If it compression tested good they may be fine. I'd send the lifters in. Inspect everything very well. It's nice to have the original build sheets to see what changed. Check pistons close for loose ring lands and cracks, pin for feeedom of movement, rod bolt length if measured originally, cap mating surfaces, cam lobes, valve lock grooves, diassemble and inspect oil pump. Doug
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Re: engine inspection
[Re: dvw]
#2007928
02/08/16 02:38 PM
02/08/16 02:38 PM
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Joined: Jul 2004
Posts: 19,318 State of confusion
Thumperdart
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 19,318
State of confusion
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Another unmentioned tester is a vac gauge install and viewed to keep tabs...........
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: engine inspection
[Re: Stroker Scamp]
#2008886
02/09/16 11:04 PM
02/09/16 11:04 PM
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Joined: Feb 2003
Posts: 12,675 Columbia, CT
moper
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 12,675
Columbia, CT
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I am always looking close at the backs of the rod bearings, and the main cap parting lines. It can tell you a lot about the tuneup and longevity of the lower end.
Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.
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Re: engine inspection
[Re: moper]
#2010888
02/13/16 01:12 AM
02/13/16 01:12 AM
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Joined: Nov 2004
Posts: 3,518 pacific northwest
Stroker Scamp
OP
master
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OP
master
Joined: Nov 2004
Posts: 3,518
pacific northwest
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Well #6 and #8 exhaust ports are pretty oily think it may be a guide issue not sure, all leak down numbers are less than 10% except one at 19%, I did have #2 cyl. that gave me a reading at 70% but that was a stuck intake valve, hit the valve with a hammer and all is well now bores still show a cross hatch checked a rod bearing and all looks well. Oil pan bottom clean. think I will run thru the heads diagnose the oil issue and button it back up Thanks for the tips
footbrake N/A SB 408 Scamp 10.10 @ 132 street/strip 73 Duster 340 street strip 12.79 @ 105
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Re: engine inspection
[Re: Stroker Scamp]
#2010956
02/13/16 05:25 AM
02/13/16 05:25 AM
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Joined: Aug 2003
Posts: 43,307 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,307
Bend,OR USA
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How are the #6 and #8 intake ports and the back side of the intake valves in those ports, are they dry and clean or oily and gummy? If dry and clean then the exhaust guides and seals are the only items left for possibly oiling those exhaust ports Good luck, let us know what you find
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: engine inspection
[Re: Cab_Burge]
#2010959
02/13/16 05:35 AM
02/13/16 05:35 AM
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Joined: Nov 2004
Posts: 3,518 pacific northwest
Stroker Scamp
OP
master
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OP
master
Joined: Nov 2004
Posts: 3,518
pacific northwest
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How are the #6 and #8 intake ports and the back side of the intake valves in those ports, are they dry and clean or oily and gummy? If dry and clean then the exhaust guides and seals are the only items left for possibly oiling those exhaust ports Good luck, let us know what you find Both intake ports look clean however both had oil on the back side of the valve where it hits the seat, haven't really dug into them yet, will tomorrow
footbrake N/A SB 408 Scamp 10.10 @ 132 street/strip 73 Duster 340 street strip 12.79 @ 105
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Re: engine inspection
[Re: Stroker Scamp]
#2011245
02/13/16 06:37 PM
02/13/16 06:37 PM
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Joined: Jan 2003
Posts: 5,486 SoCal
Brian Hafliger
master
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master
Joined: Jan 2003
Posts: 5,486
SoCal
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Leak down only tells you about the top ring, valve job, and bore... If you have oil on the intake valve, and in the ports it's going to be oil ring and possibly the 2nd ring as well...
What's the deal with the "stuck" intake valve????
Brian Hafliger
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Re: engine inspection
[Re: Brian Hafliger]
#2011883
02/14/16 06:15 PM
02/14/16 06:15 PM
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Joined: Nov 2004
Posts: 3,518 pacific northwest
Stroker Scamp
OP
master
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OP
master
Joined: Nov 2004
Posts: 3,518
pacific northwest
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Leak down only tells you about the top ring, valve job, and bore... If you have oil on the intake valve, and in the ports it's going to be oil ring and possibly the 2nd ring as well...
What's the deal with the "stuck" intake valve???? I was for sure I have a bad #2 hole because I checked it 3 times with the same results, so I pulled the piston expecting a broken ring. everything was fine. Put the piston back in and put the head back on without the rockers and this time when I did the leak down I felt air coming out of the intake port, Valve was stuck open, tapped the top of the valve with a hammer and it sealed?? Not sure why it hung open yet
footbrake N/A SB 408 Scamp 10.10 @ 132 street/strip 73 Duster 340 street strip 12.79 @ 105
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Re: engine inspection
[Re: Stroker Scamp]
#2012160
02/15/16 12:43 AM
02/15/16 12:43 AM
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Joined: Aug 2003
Posts: 43,307 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,307
Bend,OR USA
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A piece of grit, carbon or maybe a small spot corrosion on the valve seat or the valve mating surfaces The valve not seated all the way will do the same thing, check the valve guide to stemm clearances also If it is more than .0030 fix it I've seen the same reults many times in the past
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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