Standard pistons + H beam rods and boost

[turk 7]

Afternoon all. 

 

 

Have been building a NA vr6 motor for a while now, but sudden change of heart has made me want to strap a GT35 to it

 

The predicament is i have brand new 2.9 pistons and block, so i dont want to splash out on pistons/block machining again. 

 

So my question is how much boost can standard pistons with H beam rods hold with a spacer gasket? Or Does the standard pistons fail before the standard rods?

 

I already have Schrick big valve head, high tensile valve springs and 268s to go with it.

 

Thanks in advance 

Edited September 24, 2014 by turk

[turk 7]

any one ? 

[UnitedMotorsport 55]

Heat will kill stock pistons, at a torque level exceeding the capability of stock rods.

Edited September 25, 2014 by UnitedMotorsport

[turk 7]

Thanks for the reply, so you reckon its a good idea to change the rods?

 

Looking for reliable set up that will take abuse of 400-450 bhp but im scared ill want more, so not sure if i should sell on what iv got and start again.

 

cheers 

Edited September 25, 2014 by turk

[MaidenVR6 26]

Did 380-400whp for over 2 years on a 8.5:1 stock engine. And 1 year daily driving with 280whp supercharger before that. It was in good shape when i took it apart. It all depends. Weak gearbox, LSD diffrential money and a very strong clutch is more what you need to concider.

Over 15 psi, drivetrain start to cost money.

[FishWick 21]

Don't you run E85 though?  Therefore much cooler cylinder temperatures and much higher octane.