UkLegacyT

anyone know where i can find this info?

thanks

David_Wallis

Total engine cc / 4 ???

David

ustolemyname??stevieturbo

iTrader: (1)

David, that would just be the same for every std subaru...
Its the cc of the individual parts he is asking for, to calculate CR.
eg head cc for various heads
piston dish cc for various pistons
gasket cc ( easily calculated )
ring land cc ( wouldnt worry too much about that 1 )
If I could find all me bits, Id measure my legacy heads, I just have no idea what I done with my syringe/burette for measuring.

SMG

Ian ive got this info at the workshop find it for you tomorrow
Steve.

Bob Rawle

Somewhere close to 67cc clearance volume for the Sti5 is about right. (per cylinder) This assumes zero deck clearance and a 0.6mm head gasket. Gives an 8:1 comp ratio at that on std pistons.

UkLegacyT

thanks for the help guys

steve, would be great if you could find the info mate ....then i can work out what pistons to use.

thanks
ian

SMG

Sorry its a bit late mate, my95 impreza chamber volume 43cc
rough guide to go by cant remember if thay are 1994cc or 1998cc, so 1998cc divide by 4, 499.5 plus unswept volume 69=568.5 divide by usv 69= 8.2:1.
unswept volume.
3 layer steel shim gasket 8cc
V6 sti piston and unswept bore 18cc
Steve.

ustolemyname??stevieturbo

iTrader: (1)

Dont forget the impreza head volume will be smaller than a legacy.

MaeckyMY98

Hello!

How much comb. chamber volume have the European specs (my00) GT?

can i work on the comb. chamber to get the Compression ratio down a little bit if i am too high?
Wich CR is good?

MaeckyMY98

Hello!

Noone this Info??

cu

Maecky

dowser

Just did phase 2 (my99/00) Impreza heads; 50ml volume for the head portion.

Maecky - you need to know the bore and stroke to calculate CR. Then use PixR2xstroke to calculate cylinder volume. As mentioned above, you also need to include head gasket thicknes and measure volume of head chamber and piston crown (I used a plastic plate with holes drilled in it, placed over the cylinder or chamber (sealed with oil) and then accurately measuring the amount of fluid it can hold (blue screen wash is best, no issues with airbubbles)).

I'm running a CR of 8.8:1 - a little high perhaps (?), my target was 8.5:1.

Edited to add: the above makes it sound like I know what I'm doing....I don't....but my engine builder is quite short...making it easy to look over his shoulder

Richard

[Edited by dowser - 1/12/2004 7:00:30 AM]

MaeckyMY98

Hello!

@dowser!

Thx for the info!
The procedure of calculating i know and i use this page to calculate it! http://www.csgnetwork.com/automotiveconverters.html

Where in Switzerland are you located? Sprichst du Schweizerdeutsch??

cu

Maecky

dowser

Nicht so gut....Hochdeutsch ist auch schlecht I'm around Zurich area - are you the Mäcky I've heard about via Cirpower and Streetcarcup?

Richard

MaeckyMY98

UPS im going that round?? lol

Yes i am Mäcky!

Mail me offline please mpmotorsport@vol.at

cu

Maecky

MaeckyMY98

Hello!

Other question!

How much cc´s can i get out of the Heads if the Volume will not fit (the comb. ratio ist too high) and on wich pos. i can remove some material!
Anyone have done work to his combustion chambers??

cu

Mäcky

dowser

Ignore my email - thought you were talking about increasing CR

To reduce it, potentially a different (thicker) head gasket, but I don't know what reliability issues this may/may not bring about. One of the UK guys probably has more info. What MY engine?

Richard

MaeckyMY98

Hy!

The engine is/was a My00 engine!

i will use 1.4mm Gaskets cause thes are not to expensive and easy to get in the 97,5mm! (tried a long time to get 2mm strong ones but was not possible!

cu

Mäcky