Compression pressure in ok 907Ie engine????

Finnpaso · **Posted:** Thu Aug 07, 2008 6:55 pm

Have anybody tested, what shall be right compression pressure in normal working 907IE engine ???? One USA guy contacted to me and asked, cause he feels, that compression is not enough high. He is suffering also serious charching problems(maybe both, regulator and generator have blown).. i try help him... :oops:

Tamburinifan · **Posted:** Thu Aug 07, 2008 9:27 pm

10-11 kg/cm2 is average f a 2V 900.

Finnpaso · **Posted:** Fri Aug 08, 2008 4:27 am

Thanks!

jcslocum · **Posted:** Fri Aug 08, 2008 12:56 pm

Even pressure is more important than high pressure.

Finnpaso · **Posted:** Fri Aug 08, 2008 3:18 pm

Btw, i check from ST2/2002 workshop manual and it says:

Standart: 9-11 bar
Min: 8 bar
max diffrerence between 2 cylinders: 2 bar

ST2 engine is same, as 907, only bigger bore.

thanks guys! :thumbup:

samandkimberly · **Posted:** Sun Aug 10, 2008 5:57 pm

Just measured mine - stock 907ie, 20k mi, 1k mi on fresh valve job, measured on COLD engine, with throttle open: 9.5 bar both cylinders.

I'm sure it would go up on a warm motor.

Sam

Finnpaso · **Posted:** Sun Aug 10, 2008 6:30 pm

Sam, You dont have anything to worry! ST2 workishop manual says, that pressure have to be measured after heating engine up, that fan start to work.... Your pressures seems to be ok.... :smoke:

samandkimberly · **Posted:** Sun Aug 10, 2008 7:32 pm

Compression pressure in ok 907Ie engine????

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