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stevecoolerking

102 Posts
Member #: 155
Advanced Member

3rd Feb, 2004 at 03:05:34pm

I JUST BOUGHT A TURBO ENGINE FOR ?200 I HAVE A 1275 COOPER , WOULD IT BE EASIER FOR ME TO JUST PUT THE TURBO HEAD ON MY COOPER ENGINE ?
IF I DID THIS ISNT THE COMPRESSION LOWER ON A COOPER ENGINE ALLOWING HIGHER BOOST ??

iain
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8506 Posts
Member #: 16
Sold the turbo and seeing what the C20XE can do!

Near Lincoln

3rd Feb, 2004 at 03:58:26pm

This is most people's mistake:

The head can indeed decrease the compression ratio but IIRC the turbo head and std head have very similar chamber volumes.

The main way to decrease compression is to fitted dished pistons as fitted to a std turbo engine. Any 1275 motor can have these fitted to it.

The overall result is a lower compression ratio for the turbo to run without detonating.

Ideally for a "higher" boost engine (i.e. more than std) around 8:1

Std compression ratio is in the order of 9.2:1 IIRC.

Hope that helps.
Plus when icreasing the power make sure the rest of the drive train and suspension is upto it. All those "iffy" bits will soon fail with more power including things like cooling systems etc.

AlexF2003

5795 Posts
Member #: 80
AFRacing LTD

Newbury, Berks

3rd Feb, 2004 at 04:15:00pm

std metty turbo is 9.4:1


alex

AlexF
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