State Of This Engine.

[Andyn]

Hey,

Just curious what you guys think of this compression test for a rb20, thats done 144,000 ks (140,125,125,120,125,130). Stock engine with normal bolt ons. 3"exhaust, AVCR boost controller, BOV, Turb timer.

The timing was overadvanced from the previous owner-not sure for how long, and there was a bit of knocking when under load. Planning to reset the timing and regularly keep this engine in shape.

Trivial question - is it possible to improve the comp test after timing is reset, or will the readings not really change? What are your thoughts/guesses about the engine, just from the info I gave above?

[smurf80]

I dont think so To fix the compression on a motor a rebuild is in order.

Readings are a little low with an engine with relatively low kays. Sounds like its had a hard life.

Edited February 23, 2006 by alphanumeric

[Tommyk]

kms wont be genuine

[Andyn]

Assuming that engine has hard a hard live and has had knocking etc.

What are the chances changing the rings will fix this issue? Not too sure what parts usually give first when knocking occurs.

[CruiseLiner]

Assuming that engine has hard a hard live and has had knocking etc.

What are the chances changing the rings will fix this issue? Not too sure what parts usually give first when knocking occurs.

get rid of it while it still has compression, as it wont last long

[rev210]

yep once they start to go it all goes down hill pretty quick.

Checked my No 3 again the other day it's down to 100psi. Blow by like puffing billy.

Thanks to a blown turbo ceramic dusting the bore, all the others are a nice 150+ even.

[Andyn]

Thanks for your comments guys. I decided to give that one a pass.

I am looking at getting another one with comp test of 125 in all cylinders. Whats do u guys think an acceptable range is for comp test results for standard rb20?

[rev210]

was that 'cold' or 'hot' compression?

[Andyn]

I know for sure it's a dry test, and when you say Hot or cold, I'm guessing Hot is just after the car has been running.

In which case yes it is a hot test - We drove the car to the mechs and he did the test straight away. This car has been freshly imported and has been sitting in the garage for about 5 months (Not sure how long it has been left in Japan). So I'm hoping as I use it more and give it another comp test down the track it should go up slightly.

Any comments?