Compression results

[Majik]

This is sort of for POS since we talked about it yesterday, but I wanted everyones ideas. I did a compression check on the engine today. 160-163 across the board dry, 190 in 1,3,and 4 210 in 2 wet. I think I put a bit more oil in number two so that might throw results huh? My car burns oil especially at autoXes when I close the throttle at high rpm. THe smoking has been brought to my attention even by others. Would these results seem to point towards rings or head? I will do a leakdown, but I am taking the car to the body shop tomorrow, so it will be a week or so for that.

BTW: I read in the tester instructions, slow build up to pressure can indicate bad rings. What is slow build up? The way mine was, on the first stroke, 120-130 second 150 and third 160. Any thoughts on that? Thanks guys

[fwMiata]

i saw your car today, by the fox and hound(?) off bryant irving. which wheels you have? looks nice.

[POS Racing]

What is Mazda’s spec for compression for your new fangled big block motor?

[Flyin96M]

It sounds as if your problem is in your head or in this case the head. Slow build up would be like 60-80-ect. When the throttle is closed the engine is in high vacume so it could be drawing oil past the valve seals or guides. I know you have JDM motor in there and depending on how long it sat the valve seals could have dried out. I would look at removing the head and getting freshend up as the compression number look good.

[Treibenschnell]

I know you have JDM motor in there...

I thought we all had JDM motors in our cars...

[Majik]

I do have a replacement, I just got it from a junk yard though, so it isnt anything special. you are right about it sitting around though. Thanks for the info.

BTW 3bean, everyone but you has a JDM motor!!!

[Treibenschnell]

BTW 3bean, everyone but you has a JDM motor!!!

:P

[Screamin'Screw]

Dude I cannot take your AVATAR - It's causing me to have seizures!

Oil consumption on throttle release is heads not rings.

[Adam Payrot]

Marc, I agree w/ Justin, it's your valves.

[EvilSpeeder]

I also agree. Head problems are much more common than bottom-end problems and all your symptoms point to the head.

[Adam Payrot]

I also agree. Head problems are much more common than bottom-end problems and all your symptoms point to the head.

Unless you're me, and buy a motor with both rings and valve problems

[Majik]

Great, thanks for the info guys!