xr2wishy

iTrader: (2)

since i'm getting custom sized wiseco pistons made up (already paid for just need to confirm ratio).
what would be the best ratio to aim for?
i thought an 8:1 would give me plenty of scope for bigger power later on, but an 8.5:1 would give a little more power for boost.
i don't really want to drop any lower as i don't think i'll be on the edge of sensibility anytime soon, but will have eagle rods, area six cams/springs, arp rod bolts and arp main studs too.
just after an opinion on anyone who has done this as all searches vary from 8:1, 8.2:1 and 8.5:1.
i will be in touch with an engine builder to do the boring out of the block etc.
but only whe pistons arrive in the next four to five weeks.
only got a 2.5BAR map sensor, so limiting factor of 21psi ish boost for the near future.

cheers
sean

clarke5700

my comp ratio is 8.1-1 and drives very well atm. its only on a base map but is still very responsive off boost

xr2wishy

iTrader: (2)

i'll stick with a ratio of 8:1, i will probably raise it a touch with the block being skimmed for good measure no doubt.

Sp3no

iTrader: (1)

Impossible to say exactly what your comp ratio will be without cc ing the head. Specially with a skim. If your skimmimg the head go for 8.0-1

crazycage

i would spec it so it's 8-5-1 on the standard focus rs gasket then if you want to drop it a little all you need to do is fit a st170 head gasket.

mine is 8-7-1.

Sp3no

iTrader: (1)

I was under the impression all the 2.0l head gaskets were the same

crazycage

no mate the focus rs one is 0.6mm the st170 is 1.1mm and i have a few 1.8mm ones thats are ford also.

robnock

wot does all this ratio mean wot is better lower or higher