im getting into a fizz about compression ratio

from what i gather you determine it via head cc,piston cc and stroke etc etc

im planning a 2.1 stroker using avcs heads and im nearly ready to start collecting the parts

i see companies like advanced automotive selling kits with head gaskets but how do you know which size gasket to go for?

http://www.advancedautomotives.com/s...age-1484-p.asp

i want to run around 450-475 bhp as a fast road car,no track use and no meth just v-power fuel as its an everyday car

anybody help?

 

You can always join bbscoobys as we have advanced as our sponsor and nick is always happy to answer questions like this

 

yeah I might do that, I bought my car from down that way and its got the bbscoobys sunstrip.its jase wrx old car if you know it?

 

Yeah I know the car quite well , he looked after it very well so it was a good buy

BBS is free to join and you get a nice discount with advanced aswell then

 

Yeah i will sign up later matey

 

if i used this combo in my build with my avcs heads what thickness head gasket should be used?

http://www.ebay.com/itm/JE-Pistons-Manley-H-Beam-Rods-Subaru-Impreza-WRX-2-0L-EJ205-92mm-8-5-1-Stroker-/290979895242?pt=Motors_Car_Truck_Parts_Accessories&vxp=mtr&hash=item43bfc0d7ca

 

It states all the required figures to work it out, it would be a 1.1mm gasket to get 8.49:1, if its a 0.9mm its 8.65:1.

 

does it take into consideration any machine work i may have to do on my block/heads regarding skimming

 

are you building the engine yourself??

 

no but im sourcing all the parts myself mate

 

That you will have to measure with the piston in the bore, those figures quoted by manufacturers is a guide only, you should always measure each build, inc head cc's as they are all different, your changing rods, crank etc, they all have differing tolerences from batch to batch, so you need individual measuring.

 

ahh well why not get a list of parts required from the engine builder as i think your going to make errors doing it the way you are.


dont buy something on somebodys say so on here, im not saying the advice is incorrect but it could well be.

 

this is the bit thats confusing to me,how can a company sell you a full stroker kit including head gaskets when you dont actually know what size you want until the pistons are in the bore and the machine work has been done?

 

Because most people wont know any different, and HG's are cheap but make the kit look bigger etc

 

Exactly, there are pistons out there claiming to be a specific cc crown, when in fact they are nothing like it, so never trust anything out the box, it can & will catch you out.

 

I'd leave the headgasket out of the equation and have that worked out once the build is done. Have you spoken to any engine builders (Engine Tuner etc) as having it built and buying a "kit" will probably work out a similar price.
IIRC Enginetuner had a "roll in, roll out" price on a 2.1 depending on parts used?. I'd see if that includes any block work (skim, reface or thrust conversion) then of course its heads etc etc.