Compression Pressure for 4agze (afm + map)

[~SlideWays~]

I've searched and can't find.

I need to know what the compression pressure should be on both the MAP 8.9:1 and the AFM 8:1 gze's


My MAP small port was at least 180 on each cylinder does that sound right? I'm just about to test my AFM big port now but i assume it'll be less because of the compression?

Plus is there anyway to do the test wrong and get a bad reading?


Thanks in advance.

[~SlideWays~]

ok tested big port afm gze and they're all around 155psi compared to the Smallport's 180psi.

Would this be because of the compression ratio?

Are these decent readings for both engines?

[EVLGTZ]

Sounds about right. As long as they consistent then that should be good enuff. Dif testers give different readings so yeah sounds fine

[ATAl]

I got 180psi on all cylinders on my small port 4agze and it seems to be in good condition so I guess yours is fine.

[kingcorolla]

the only ways to get a bad reading is-

-Not winding enigne over sufficient amount of times. (roughly 10 comp strokes)

-Blowby past the gauge if not held in tight.

-Throttle not wide open.

-maybe if you bought your gauge from supacheap.

-faulty gauge. (see above)

[~SlideWays~]

Cheers guys, happy to know my engines are healthy