Standard turbo pistons...
Turbo Mini Forums

Are standard metro turbo pistons up to the job of around 180 bhp

What cc are they

And what CR will i make with them and a 28cc chamer head..

i have ran them with intercooler at 14psi all day

they are much better than some peeps give them credit for

dont know the cc in them as my heads a shed a lateley, but....... with 28 ccs in the chamber on a 1275 will give you 8.4:1 cr
just about right

Just what i wanted to hear, cheers mate..

What did your engine make? And what turbo was on it?

Standard dish is 12cc , You can open out the dish on these pistons and get 18cc at a push. Mine are currently at 15cc and i intend to hammer them to 180bhp. rings can be a bugger to find though

Edited by Sprocket on 11th Nov, 2007.

How did you get them machined out, or who did you use?

What boost are you running?

I had the pistons CAREFULLY removed from the rods.

I used an damaged piston first, cut the dish in the dimensions i wanted, then cut the piston in half. In doing this i could see the crown profile, i didnt want to reduce the strength of these pitons with 180bhp behind it. Once i was happy, i machined the four good pistons, measuring the cc it came to 15cc.

As you can see looking at the cross esection you can still go more on the machining, it all depends how far you want to remove the safety margin.

I am more than happy with the results

Same thing was done with mine - looks just like the above.

fine at 12-15psi so far.

If i sent one of you a set of four, could you dish them out for me please?

I used standard in mine and ran 16 PSI fine with a Cossie cooler.

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

I just got mine whacked in a Lathe, and took 5.9mm from the top lol. I ended up with about 7.5:1 CR on a std combustion chamber.
Mine happily ran 1.5 bar boost with a T3.

Standard pistons are heavy, but very strong.
Just dont have detonation...it will destroy any piston/ Although I have to say, I did detonate the crap out of mine at times, and they survived.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

Stevie, Those pistons in the pictures above the dish was machined down 5mm, so you can actualy see how much meat there is in the crown. Going the extra .9mm shouldnt be a problem, as you have experienced. I was erring on the safe side

yes i too think the standard pistons are really good.

Best 1/4 mile 13.2 seconds @116 mph
First 5 port miniturbo to make over 200 bhp on a carb?
First 5 port miniturbo to make over 200 bhp on Injection?

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On 11th of Nov, 2007 at 08:18pm Mini Sprocket said:
Stevie, Those pistons in the pictures above the dish was machined down 5mm, so you can actualy see how much meat there is in the crown. Going the extra .9mm shouldnt be a problem, as you have experienced. I was erring on the safe side

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will