21251 pistons..Can they be used or not?
Turbo Mini Forums

Hello. I'd like to know if anyone has successfully installed these 21251 pistons and what their experiences have been.

I know they're not the best pistons you can install, but after measuring the cylinders, I'm seeing that I'm just slightly outside the standard tolerances and I'm forced to go with the 0.020" oversize. I have the opportunity to get 21251 pistons at a very good price. I'll be using the car sporadically, on weekends, some spirited driving, but nothing like racing all the time. The engine has a 998A+ camshaft and I'll be revving it to 6000 rpm. I know that high revs are the main weakness of these pistons. It will have an intercooler and an IHI VL38 turbo like the one in the Abarth, which operates at around 10 psi. It's a very compact and efficient turbo, and I managed to install it with the Metro Turbo exhaust manifold without modifying the bulkhead. The idea is to get around 120/130 hp. Above all, I'd like to hear opinions and experiences from people who have them. What results have they obtained? Pistons with holes due to poor combustion, there will be cases of 21251 and omega forged pistons.

They are generally considered a bit fragile for boosted use. The 21253 is the better of the budget pistons and will handle some boost.

Phil.

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