9:1 Wössner

namso

Registered
What PSI should you be getting when doing this TEST with 9:1 pistons :please:
all are 80 psi is it normal ?
 
Usually between 100 and 120psi on the builds I have done

Need to have a fully charged battery, throttle wide open, and be sure there is a check valve in your compression gauge.

What is the cam timing?
 
Yeah, without the check valve, you only get the compression from a single stroke. With the check valve, it will sort of build up over a few strokes.

What compression pressure did you end up with namso?
 
all around 115psi
but before installation i cut piston rings ,
it can be lower than original ,
before i have oem pistons with 2mm spacer

do you know what i have to do about ignition retard sportbikeryder ?
 
Timing depends on fuel, charge cooling, howmuch boost, and what you are doing with it.

If you have a fairly conventional system, and you are only drag racing and using a fuel such as VP C16, ~28-30 degrees timing should be good for up to about 30psi boost with lowered compression. It really depends on what the complete setup is.
 
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