rg42284

I'm about to purchase a 93 with a streetported new engine that has 3mm seals that has a ratio
of 85psi on the front and 60psi on the trailing rotor. Is this bad? Or just right?
What about an air/fuel ratio of 14:1 ratio.....stoichiometric is 14.7:1? Please help me out.

Thanx in advance

adamlewis

I always thought it was supposed to be 9-9-9...

As for the A/F ratio...who knows? It depends on what all has been done to the car

adamlewis

oops...im an ***....that 9-9-9 is for kg/cm or some metric stuff like that...

But if you use this little thing I found, it still looks like the compression is low

vosko

iTrader: (4)

i was told 100 psi is bare minimum acceptable. should be around 110-115 for a healthy engine........

adamlewis

Yeah...that engine is definately low

vosko

iTrader: (4)

how many miles are on the engine? if it has 0 miles compression might be low because of seals not seating yet but still not a good sign.

rg42284

the engine has only 1,500 miles on it. He said that he did the break in process. The engine
has 3mm seals, and streetported. He said that the compression ratio should lower because of the
3mm seals.

vosko

iTrader: (4)

3mm seals don't seal as well but 60 PSI is barely running. that engine might be built incorrectly. it is VERY easy to screw up the engine when putting in 3mm apex seals. extreme caution needs to be used to do it right.... might want to call the shop who did it and ask them.