JBurer

Can someone tell me what psi ranges indicate acceptable compression on a 13B-rew when the engine is COLD?

The Hayes manual for the second gen says 85 is the minimum, but that is with a fully warmed up engine....



Any help is appreciated!

Best,

John

JT-Imports

Also matters what your RPMs are. I dont have the chart but I

would think its in the HAYES manual

Fd3BOOST

look here

vosko

100psi is decent. my FD engine has 150psi compression on both rotors

9BASE3

Goddamn... I thought a 120-130 was like max?

vosko

normal engines have 100-130. most are on the lower range...... what can i say judge ito is the man :bigok:

9BASE3

Ahh. Sweet ***!

vosko

my TII when it ran had like 95psi and 90psi. that engine ran fine. no hot start problems nothing. obviously the higher the number the better but if you get around 100psi the engine should run fine

9BASE3

This might be a stupid question... But:



Why does low compression lead to hot start problems? Whats the heat have to do with it?

j9fd3s

well the ecu is setup to the "stock" compression specs, so thats one. the other thing is that the higher the compression the more torque you will have, so it will run and start better. thats not a really good way to explain it but i'm having a hard time putting it into words.



the heat basically acts like vapor lock, the fuel can boil in the rails and it might do other stuff too



mike