thicker metal head gaskets

[30psi]

The cam would be advanced by less than a degree with even a 2mm gasket, so its not anything significant.

The off boost power would be reduced.

[Dez]

All of the above plus the fact that the boost depends on a fine balance between the comprssion ratio and the volume of air been induced into the cylinders. Yes the engine will take in more air, but what you gain you'll lose automatically becase the compression ratio will be far less. Sorry mate but you'll acheive nothing.

[Beany-s12]

surely the increase in boost pressure that he's lookin to gain from doing this will over compensate the loss of compression!

[sideways danny]

Originally Posted by Beany-s12

surely the increase in boost pressure that he's lookin to gain from doing this will over compensate the loss of compression!

but the ET is already a low compression engine, at 8:1 it's lower than a lot of turbo engines of the same era, newer turbo engines seem to be running a lot higher CR. the Audi/VW 1.8T is 9.5:1 for instance. IMO you don't need to go lower than 8:1.

The engine I'm building will have re-worked combustion chambers but I will skim the head to compensate

[CNHSS1]

i thought the ET was 8.5:1

[30psi]

Nope its defo 8:1.

[sideways danny]

Originally Posted by CNHSS1

i thought the ET was 8.5:1

no, the DET it 8.5:1 the difference is almost entirely down to the larger chamber volume of the head, the pistons aren't dimensionally much different really

[smoker]

I skimmed 40thou of my head when I rebuilt so i reckon my CR is 8:5 - 9.0:1. No problems with detonation so far, i plan on using water injection if I hear any when I up the boost further.