Toyspeed.org.nz Message Board

by **B_giB** » Wed Nov 11, 2009 7:56 am

What should the compression be on an AE92 FX-GT 4AGE?

100 psi to low?

by **Adamal** » Wed Nov 11, 2009 8:23 am

What kind of 4AGE is it?

by **B_giB** » Wed Nov 11, 2009 8:43 am

I think its a red top

by **jakesae101** » Wed Nov 11, 2009 12:58 pm

yup thats pretty low

by **strx7** » Wed Nov 11, 2009 1:11 pm

depends on cranking speed and if the engine has been running or if its a cold compression.
if its cold compression and it had 100psi across the board, i'd pay money for it

by **d1 mule** » Wed Nov 11, 2009 7:05 pm

low, the manual says 156 minimum. I did my ae92 4agze cold comp (not been run for months) was 155-160 across all four

red car · by pc » Wed Nov 11, 2009 8:51 pm

I'd check the basics before getting too worried about it, is the cam timing correct?, tried a different compression tester? is the battery charged enough to do a valid test? is the starter a different type with lower gearing? etc.

Having all 4 cylinders being completely fail, evenly, sounds unlikely.

by **iOnic** » Wed Nov 11, 2009 9:21 pm

Hard to answer a question like "is 100 too low". Need more details ie was the engine up to operating temp? Any intake restrictions? Was the compression test wet/dry? What condition was the battery/starter in? Throttle wide open? Good compression tester? Repeated tests? etc etc etc

The variation between cylinders matters more than the actual figure. It's highly unlikely for all 4 cylinders to be low on compression with little variance between them...

by **strx7** » Wed Nov 11, 2009 9:55 pm

d1 mule wrote:low, the manual says 156 minimum. I did my ae92 4agze cold comp (not been run for months) was 155-160 across all four

for cold compression, unless it had oil in the bores, that is some pretty high cold compression. some of the engines we get at work which hot test at 220-230 only cold test at 130-140.

by **d1 mule** » Wed Nov 11, 2009 10:48 pm

strx7 wrote:
d1 mule wrote:low, the manual says 156 minimum. I did my ae92 4agze cold comp (not been run for months) was 155-160 across all four

for cold compression, unless it had oil in the bores, that is some pretty high cold compression. some of the engines we get at work which hot test at 220-230 only cold test at 130-140.

yeah i brought it from a engine importers then had it sitting at my place for a few months, couldnt get it going so comp tested, all were 0psi, had the exhauts cam in 180 out re tested all 155-160 without being run in at least 6 months

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