recurring race engine problem help


JohnOBrien8 said:
im not saying your wrong but what about all the fellas running turbos alot just uprate the headstuds with no problem.
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I've never had issues using ARP headstuds but I agree on not using ARP mains.
 
JohnOBrien8 said:
im not saying your wrong but what about all the fellas running turbos alot just uprate the headstuds with no problem.
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We're probably at a point where more of the B and D series engines out there run ARP hardware than don't.
 
Pretty sure no torque plate was used when boring but I will have to ask to confirm

Do any rally cars or 210 bhp engines use block guards ?
 
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dave benson said:
Pretty sure no torque plate was used when boring but I will have to ask to confirm

Do any rally cars or 210 bhp engines use block guards ?
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It doesn't matter with open deck blocks. It's only when the block is "closed deck" that a torque plate is advisable .
 
Sorry Ive no valuable input but it's quite an interesting read. Hope you get it sorted!
 
Getting sick of it to be honest, all those mods and money and it won't last without eating itself, I know it's getting a pasting but it's going to be scrap after 300 miles !

Help:angry2:
 
dave benson said:
Getting sick of it to be honest, all those mods and money and it won't last without eating itself, I know it's getting a pasting but it's going to be scrap after 300 miles !

Help:angry2:
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Find out off your machine shop what the piston to wall clearance is. What rods are you using?
 
Your best off bringing it to an competition/race engine specialist to get a definitive answer in person.. these things cannot be diagnosed properly over an internet forum.

It would have been an ideal time to do a simulation run on a dyno to rule out faulty components but looks like you have it fully stripped ...
 
If you're only doing the assembly, and you've used the same machinist/engine builder for every engine, and they've all had the same issue, then get another engine builder to measure the engine. The problem 'could' lie there.


Having another engine builder measure it will rule out if any tools used are in/out of spec. Using the same builder to remeasure with the same tools might miss the issue

To me it looks like p-w clearance is too tight. The piston is expanding too much and is scuffing.
 
The wiseco pistons are supposed to run tighter than most other makes ? The space sheet says 0.0025"' that's what they were set to, but need to recheck

Could the way my head was welded up (cloverleafed)cause the thrust faces to get too hot ?
 

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have you got any pics of the tops of the pistons?
unless the quench areas are causing det, i doubt they'll affect it.
 
no signs of det. i dont think that's causing any issues.

you say the rings are fine, so piston ring gap isn't causing any issues.

its gonna be p-w clearance. you know what it should be, just get a 3rd party to measure what your engine builder bored it to.
 
It's getting measured again tomorrow at my house but I have an event in a few weeks and I'm not sure I have time for another strip rebuild and taking it to another engine builder to be checked so I'm a bit stuck

I'll post the figures tomorrow, thanks
 
Had it re measured and the p/w clearance is 3-3 1/2 thou, no time to remove the engine/ gearbox and get it measured elsewhere, just have to see how it develops

Thanks
 
First off I would only ever use a decent 10w40 Semi Synth oil in there.
Secondly get it fully mapped again.
Dunx
 
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