So is the difference what makes a Yugo engine a "128A"? Or does
the "A" suffix make any difference at all, between FIAT and Yugo?
JEFF FAHRINGER <joffrey1@verizon. net
The spacing of the valves is about 39mm from center to center if
your valve heads were 36 and 31mm diameter, they would be about
5.5mm apart at the heads. If your valves were 30 and 26.75mm, they
would be about 10.5mm apart. You say you see about 7mm on the fiat?
Somethings not right here. What are you using to measure?
CR is the ratio of swept volume (displacement) over the remaining
combustion chamber volume when piston is
at TDC. As Art said it is
not about valve size. You have to measure the volume of c chamber.
This is normally done by filling it with liquid from a graduated
measuring thingy. That will allow you to determine which will give
higher compression. Otherwise you are just guessing.
Ye said: "Yes, maybe both used valves I have are not exhaust valves"
Actually, I was suggesting that they were exhaust valves. 31mm is the
size that I see on yugo exhaust. 31mm is not a size that you say you
saw at all on your yugo head. Please be very careful that you read,
measure and write without error as it puts everything in question.
Valves have to be matched to their seats, so you cant switch any of
them around or install new ones without doing that. I recommend
having a auto machine shop do it. They have the tools and experience
that you and I do not.