conpression ratio’s

[wayne_clio16v]

alrite jst wondering if any1 has a turbo convesion on a 1.8 16v lump? and wot the compression ratio should be? and wot psi the turbo should be running?

thx wayne

 

[edde]

It all depends on the power your going to run.

Nick hill has a high pressure 1.8 16V.

The higher the psi (assuming no change in temps) the higher the power 14.7 psi will give twice the stock power. 29.4 would give 3 times stock power. However you need to lower the compression ratio to enable you to stop detonation etc. If your only running very low boost and intake temps then you might get away with stock internals but the gains will obviuosly be low since any more psi and youll have knock etc unless your running very high RON fuels.

 

[BenR]

Thats a very poor way of looking at it.

Boost and power are not linear and the correlation between boost and dynamic CR is what makes the power difference. And since pressure is nothing but a measure of restriction, you cannot simplify it like you have.

CR on any turbo is only dictated by the entire engine as a system, there is no CR that the engine should be.

 

[wayne_clio16v]

ok let me re-phrase it then can any1 tell me wot the compresion ratio and psi there running on there own turbod 1.8 16v or 2.0 i want to know as i have a foumla renault racing engine thats got forged pistons,rods,high lift cams,lightened bottom end etc and i want to no wot sort of boost i could run on it ?

 

[BenR]

It wont be suited to forced induction applications with the piston compression height and design and the camshafts wont work with a turbo very well.