Lex

So last night I got a ride in my friend's 1990 red miata. It was a blast and I fell in love with the little car - first convertible I was ever in!

We did a compression test later that night and the motor came out with 215psi compression across the board. The manual specifies 192psi compression and the tester was working fine. The motor has 160k miles on it. Has anyone seen such high compression on a broken in motor?

olderguy

iTrader: (19)

Sounds like someone shaved the head, used a thinner head gasket, or changed pistons along the way if the test was done correctly. But that's just my guess:gay:

Ben

iTrader: (33)

yeah a motor I had came back at 205 psi per hole. I figured that my gauge may be a bit innacurate.... and hope that I didn't sell some bad *** built motor for $350.

hustler

iTrader: (6)

magic motor

brgracer

iTrader: (14)

It shouldn't do it that much, but if it was owned by someone who rarely took the car above 4k rpm (as some "wine & cheesers" may be known to do), carbon buildup could also certainly raise compression as well. Time to do the fabled "ferrari tune-up."

y8s

iTrader: (8)

or maybe it's suckin oil into the CC

nester

iTrader: (6)

leak down test, it's the only way.

Lex

we'll have to look into it some more, I don't think it's burning any oil and I don't think the motor was ever opened up but then again we don't know the complete history. It runs fairly well however.

brgracer

iTrader: (14)

Bitch, you ever gonna let that go. :gay:

LOLA - 92

Or -- Massive amounts of Carbon Build-up! :gay:

olderguy

iTrader: (19)

Now that we have a little more history, I agree.:gay:

turbopezz

my compression was 200 across the board.i should let it sipp on some water,but im scared.

olderguy

iTrader: (19)

The key is to let it sip, not gulp.

turbopezz

yes,thats what ive been reading..i might do it tonight so no one calls the fire department.

LOLA - 92

Water is not bad! It's that other **** they use over on m.net that makes the black smoke.........:gay: "SEAFOAM"

cjernigan

iTrader: (13)

Yay fouled plugs and caked 02 sensors.

Lex

you guys don't like seafoam?

lazzer408

iTrader: (1)

Seafoam rules! 160k worth of carbon buildup? hehe

EDIT - And no more mosquitos for the evening! =)

LOLA - 92

It's not that I don't like SEAFOAM --- I like the idea of FREE WATER. :gay:

turbopezz

i let my car sip a very very little bit of water ..and you can actually here a difference the motor sounds a little smoother quiter.