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Engine - General, Exhaust & Induction Topics about the general engine items, exhaust system discussed here & Improving the intake tract - air filter to intake valve.

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Old 12-04-2012, 08:43 AM   #16
Re: low compression?????  
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shelby x's 2 is keeping the peace
great advice guys thanks.

im ordering parts today ( sealed power re-ring kit)
am i going to need to file the rings??? if so, how do i do that?
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Old 12-04-2012, 08:46 AM   #17
Re: low compression?????  
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also, im sure you guys have seen the tiny cracks in the head between the valves, how afraid should i be of those?
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Old 12-04-2012, 08:52 AM   #18
Re: low compression?????  
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Quote:
Originally Posted by shelby x's 2 View Post
also, im sure you guys have seen the tiny cracks in the head between the valves, how afraid should i be of those?
Normal, have the head pressure tested and if ok leave them alone.
Cylinder Leakdown Test will also show head leakage.
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Old 12-04-2012, 09:27 AM   #19
Re: low compression?????  
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thanks naj!
while she is in pieces im also considering adding an after-market intercooler
is this going to affect my computer?will i need a bov? i have the mitsu turbo with bov in the air box right now
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Old 12-04-2012, 12:38 PM   #20
Re: low compression?????  
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hell, back in the day we used to swap piston/rod assys out at the track!!!!!!! our motto was broken piston, better then a broken trans!!!!!!
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Old 12-04-2012, 02:16 PM   #21
Re: low compression?????  
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I've cracked 3 pistons (2 on the same weekend drag racing). The last time I didn't have time and drove the car on 3 cylinders basically (cylinder 4 had like 60 psi compression) for a few months. Then I finally saved up and got forged and did it right and haven't broken a piston since. Reusing old pistons and getting it to run is fine as long as you don't expect them to last a long time if you thrash on the car. It's always a trade off, time or money.
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Old 12-04-2012, 03:39 PM   #22
Re: low compression?????  
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I've done the swap by doing a sand paper hone with the old rings before, rings from another engine. Just making sure to go sideways. I also swap rods too, even less timing involved.

The biggest issue is piston weight change really. With the 8v Dodge though near stock they run under 5,000 mostly and it just doesn't matter that much. Weight gets off from filth and carbon more than the little bit in piston weight change.
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Old 12-05-2012, 09:46 AM   #23
Re: low compression?????  
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You need to find why this happened,or it probly will do it again and crack more pistons, you allready know that I guess
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Old 12-05-2012, 11:01 AM   #24
Re: low compression?????  
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shelby x's 2 is keeping the peace
thanks guys!
patrick- im sure this happened because i found a crack in the air box(T1), a broken knock sensor, and overboosted it HARD, all at the same time!! it was running great before that. it sat in storage too long and this happened bringing it home to get started on restoration. oh well, the head gasket looked terrible anyway.

im ordering new pistons and gaskets, hopefully be done by sunday, i will keep you guys updated.

btw, whats up with filing the new rings? i have never done this before

thanks for everyones help!!!!!!
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Old 12-18-2012, 09:10 AM   #25
Re: low compression?????  
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Finishing up putting her back together today. Thanks for everyone's help! Any advise on breaking in those mahle rings?
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