Compression Test Results

[Iamjohnhayes]

i just did a compression test on my KA24E and here are the numbers,

1 - 1602 - 1603 - 1604 - 165

The motor is out of an 89 has about 190+K on it never been rebuilt. I know the compression brand new should be in the 175 to 180 range at best. I plan on running a garrett Super 60 trim t3 w/ .48 a/r turbine at about 7 to 10 psi, after buying a new clutch (b/c mine is original still).

Should I boost it or rebuild it i have not found what the minimum compression on a stock motor should be.

[Craving4Boost]

shooo im going to boosting 8lbs on a t3/t4 with 150psi compression next week for the first time. you're not gonna let me show you up are you.

but id say your good to go

[nismofly]

it doesnt have to be up there by any means, more important is having it close to equal on all 4, which you have

i think the FSM states that down to 150 is perfectly normal, and anything very high or low could be the test method

you should be ok

[Craving4Boost]

yes the most important thing about compression tests are consistency. but IIRC if under 150psi, although consistent, is reccomended for a rebuild.

[nismofly]

if you get under 150 on several consecutive tests maybe

but if its only one test, how do you know one little thing wasnt off causing the whole thing to read 70 psi low

[WDRacing]

Change the oil, run Royal Purple and boost away. I picked up 5-8 points on my RB when I switched to Royal Purple.

WD

[Iamjohnhayes]

Normally I am a fan of amsoil but i had to settle for mobile one with the last oil change for a few reasons. I just didn't know what was considered too low of a compression number. I tested maybe 4 times with the engine warm and everytime they came up the same or within 1 or 2 of the numbers i posted.

So I guess it settled then im buying a new clutch, wideband and few few more turbo parts and i'll boost it till it blows or i finish building a 2nd block

[Jookmasta]

looks like ur engine should be fine for ur plans.............

[Edub1]

190K and you're goint to turbo it without rebuilding. How long do you expect that motor to last?

[TheOne]

190K and you're goint to turbo it without rebuilding. How long do you expect that motor to last?

whats so wrong about that? people have boosted non-opened over 200k mile ka's and they seem fine, usually its so long as the tune is right then the engine should be fine.

[sil80drifter]

I boosted a 140k engine, the initial compression numbers were similar to yours. After 2 weeks of boost my numbers were around 100 for 1 and 4 and 140 for 2 and 3. Expect to rebuild soon, even without the ping, boost will make the rings/ringlands go sooner.

Oh, and here is what you can expect from a proper break-in on a rebuilt engine (again my numbers after rebuild): 195, 195, 200, 195. It made me so happy. Too bad the oil pickup o-ring was busted and the engine oil starved.

sil80

[Chezedik]

So, just did the dual exhaust swap, and am making 150 now (no matter what little adjustments I make, sort of) where I was making 180, are we good, or keep playing?

[Nismo_Freak]

So, just did the dual exhaust swap, and am making 150 now (no matter what little adjustments I make, sort of) where I was making 180, are we good, or keep playing?

Run more boost.

[nissanfanatic]

I'm pushing 144k on mine and boosting 20psi. I just trapped 118mph Wednesday night at 18psi...

[Chezedik]

Eat more ****.

[The All Mighty KA-T]

whats so wrong about that? people have boosted non-opened over 200k mile ka's and they seem fine, usually its so long as the tune is right then the engine should be fine.

Yep and i'm one of them.........when i had my T25 setup i ran 17 PSI with 230K on my motor and my compression is :

#1 200 PSI#2 200 PSI#3 210 PSI#4 200 PSI

[Nismo_Freak]

Eat more ****.

Wow, you're cool.

[Chezedik]

That's funny because I was thinking the same thing about you.

[nissanfanatic]

17psi on a T25 doesn't seem like such a great idea... But hey, if it works...

I personally won't touch over 15psi on pump gas...

[WDRacing]

Eat more ****.

LMFAO....

[Nismo_Freak]

Yep and i'm one of them.........when i had my T25 setup i ran 17 PSI with 230K on my motor and my compression is :

#1 200 PSI#2 200 PSI#3 210 PSI#4 200 PSI

17 PSI with a T25 on a KA?

LOL...

[Nismo_Freak]

LMFAO....

Don't you have some turbos or a KA to blow up?

[The All Mighty KA-T]

17 PSI with a T25 on a KA?

LOL...

yeah, i was a noob at my first setup and i didnt run a Vac. Line to my Wasetgate , so the dang turbo just keep on spoolin........

[The All Mighty KA-T]

17psi on a T25 doesn't seem like such a great idea... But hey, if it works...

I personally won't touch over 15psi on pump gas...

yeah, i feel the same way about that. Like i said, that was my first KA-T setup and it did the job for a while, i'm just sick of having full boost at 2200 RPM's, so thats why i'm going with somthing alittle bigger and i'm only going to run 7 to 10 PSI.