Miatapower List Archive

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Mail From: "Jason Cuadra" <(email redacted)>


I think going between 9.0 and 9.4 is splitting hairs. If you can get the
automatic pistons then stick with 9.1.
Theoretically an increase of 1 point of compression ratio is an 11% increase
in power, IIRC. So going from 9.0 to 9.2 is 2%. Forget the c/r and
concentrate on tuning. If you're going turbo, correct tuning, and a large
exhaust, can give you as much as 20% for the same boost pressure.

Also it's not a good idea to lower compression with a thicker head gasket
because you're increasing the "squish" gap.

-Jason

P.S. To the guy asking about the 1.6 head on a 1.8 block, you can ask Jared
about his adventure fitting a 1.6 exhaust manifold on a 1.8 head.. :-D
Sorry, just being an ass..

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This read-only message was archived from a public mail list.
Mail From: "Gary and Hakuna" <(email redacted)>


Power is not the only issue. Assuming correct tuning and a big exhaust
already, reducing CR will stave off detonation...possibly allowing more
timing for the bottom end and also giving those of us with stock injectors
some help.

Gary
hakuna-miata '91 silverstone turbo IV.2 12psi
pacificsites.net/~hakuna/miata.html



>From: "Jason Cuadra" <(email redacted)>
>Reply-To: "Jason Cuadra" <(email redacted)>
>To: (email redacted)
>Subject: Toda gasket
>Date: Sun, 05 Nov 2000 06:03:43 GMT
>
>
>I think going between 9.0 and 9.4 is splitting hairs. If you can get the
>automatic pistons then stick with 9.1.
>Theoretically an increase of 1 point of compression ratio is an 11%
>increase
>in power, IIRC. So going from 9.0 to 9.2 is 2%. Forget the c/r and
>concentrate on tuning. If you're going turbo, correct tuning, and a large
>exhaust, can give you as much as 20% for the same boost pressure.
>
>Also it's not a good idea to lower compression with a thicker head gasket
>because you're increasing the "squish" gap.
>
>-Jason
>
>P.S. To the guy asking about the 1.6 head on a 1.8 block, you can ask Jared
>about his adventure fitting a 1.6 exhaust manifold on a 1.8 head.. :-D
>Sorry, just being an ass..
>
>_________________________________________________________________________
>Get Your Private, Free E-mail from MSN Hotmail at hotmail.com.
>
>Share information about yourself, create your own public profile at
>profiles.msn.com.
>

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