How much psi can stndard pistons withstand?
Turbo Mini Forums

just wondered roughly what the max psi the standard metro turbo pistons could withstand if reconditioned, any one any ideas?
thanks mark

1310 - Supercharged 16v Twin Cam - 190BHP - SC Built.
1293 - Turbo 16v Twin Cam - Build Commenced

well over 1000 psi

probably nearer 10,000 ?

can i get that out of a t3?

some people including me have given them 16psi of boost and they still hang in there

fast carl has reved the stock! MG metro pistons to over 8k and has got a full seasons racing out of them, on inspection these were fine

thanks guys thats a great help!
mark

1310 - Supercharged 16v Twin Cam - 190BHP - SC Built.
1293 - Turbo 16v Twin Cam - Build Commenced

As above, you'll have no problems running 15psi or so on them.

WWW.TURBO-MINI.COM

I run 14PSI no problems.

Boost isn't really your enemy where pistons are concerned, however DETONATION is you big worry, this is what will most likely KILL pistons.

Avoid detonation by- reducing compression ratio, having an ignition system that can retard ignition timing with increasing boost pressure, run decent octane fuel/booster.

great advice as usual. thanks

1310 - Supercharged 16v Twin Cam - 190BHP - SC Built.
1293 - Turbo 16v Twin Cam - Build Commenced

also a intercooler :

an Intercooler is not the iceing on the cake its....................."MORE CAKE"!

corky bell: american turbo guru! quote:

Edited by BENROSS on 10th Aug, 2006.

If the standard pistons are that good, what are the advantages of using the Forged pistons?

Im about to rebuild and not sure whether to just keep the standard ones in or not?

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1/4mile in 13.2sec @ 111 terminal on 15psi

Advantages of forged pistons is that they have a 15cc/18cc dish to get your CR right down.

also, the forged ones are more likely to stand a bit (notice I said bit!) of detonation.

So would it be be reasonable to think i could lower my comp ratio from 9.4:1 to around 8.4:1 just on enlarging the chambers?

Ive read on other threads that this is a good ratio to aim for for power on and off boost.

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1/4mile in 13.2sec @ 111 terminal on 15psi

By getting plenty of meat out of the cyl head I believe you can get it down to 8.5:1 or less, Benross is the man to ask about this as until recently he was running standard pistons with a large chambered head.

Ah well its good to know that its possible.

Any preferences on a place where to get the chambers enlarged?

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1/4mile in 13.2sec @ 111 terminal on 15psi

simon at morspeed took my cyl head out to 24cc on the chambers and said he really didnt want to go much more.

balls to the blower!!!



1330,stage3 head, gt1549, canems ecu, S/C box and drops

the head iv recently bought has got 29cc chambers on the head and im going to use 15cc forged pistons in a 1293 block and run a intercooler, should get my cr down enough to run a decent boost i would of thought!

cheers
josh

My build thread..

http://www.turbominis.co.uk/forums/index.php?p=vt&tid=542985

I really want it to be a quick miniturbo as they are becoming more common and i want a bit more than dumping a standard turbo lump in.

So far its a 1293, stage 2 cam, Ul flywheel, cossie intercooler (2wd), stage 4 NA head, ive got nearly all the parts for megajolt now and im just getting the bits for a SCCR box.

The main thing i need to do now is get the CR down to turn the boost up.

i thought 8.4:1 or there abouts would be a good compromise of track and 'normal driving'?

I'll PM Benross now, Cheers Tom.

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1/4mile in 13.2sec @ 111 terminal on 15psi

if its bored out +0.020" (1293cc) then you cant use the standard pistons. you have to get +20thou, which you cant get in standard spec, so the world is your oyster

thanks gents, matty has PM me

i will sort him out