Got a compression and leak down test done last night and here are the results:
Piston 1: 220 and 11%
piston 2: 210 and 10%
Piston 3: 210 and 15% (small exhaust leak, maybe abit of carbon on my exhaust valve)
Piston 4: 210 and 9%

So I will run a SeaFoam treatment to hopefully lower the compression to about 200 and reduce all the leakdown results to under 10%. With those numbers it seems like my engine is ready for TURBO baby!!!!
Oh, by the way, it's a 1999 LS motor with 190,000 KM (or 114,000 milles for my American friends)

 

Thats a high compression number for the LS. I usually hear it between 170-190 and a +-8 difference between high and low.


Do you have a lot of carbon buildup in your cylinders?

 

Sweet!!!

I'd do a valve adjustment - I bet that would fix those leakdown numbers.

 

sweet, did you do them yourself, or did you get a shop in the ottawa area to do it, and also which shop?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by carlos11 &raquo;</TD></TR><TR><TD CLASS="quote">Got a compression and leak down test done last night and here are the results:
Piston 1: 220 and 11%
piston 2: 210 and 10%
Piston 3: 210 and 15% (small exhaust leak, maybe abit of carbon on my exhaust valve)
Piston 4: 210 and 9%

</TD></TR></TABLE>

Thanks for proving my point that I've been trying to get through many peoples' heads. Compression tests are not an accurate way to diagnose an engines condition. Compression tests are good for finding major problems internally in the engine.

To have an accurate description of your engines condition, YOU MUST DO A LEAKDOWN TEST!!!! No way around it!

Take a second to look at the #'s! Judging from the compression #s, we would say that cyl #1 appears to be the strongest. Conversely, Judging by the leakdown #s, it shows that cyl. 1 is actually one of the weaker ones. Who's right?

THe leakdown tester is more accurate because it does away with the many variables of compression test. Spinning the crank at 350 rpm shoots oil on the cylinder wall which eventually makes its way to the rings. This causes the tester to believe the rings are in better condition than they actually are.

So maybe you should think twice before posting your compression #'s because all your really telling us is that your engine is still together and in running order.

 

btw, those are great #'s especially for the mileage. I willing to bet most of the compression is being lost through the ex. valves which is perfectly normal. You really have to remove the mani to get the full picture.

# 3 cyl. has the highest leak rate because it the hottest running cyl on all b series motors. This causes extra wear on the exhaust valve. Even at that, the cyl shows to be in good condition.

I believe that as the motor warms up, they ex valves do a better job of sealing the cyl. so in actuality, your leakage rate is far below than what's suggested by the leakdown tester

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by carlos11 &raquo;</TD></TR><TR><TD CLASS="quote">Got a compression and leak down test done last night and here are the results:
Piston 1: 220 and 11%
piston 2: 210 and 10%
Piston 3: 210 and 15% (small exhaust leak, maybe abit of carbon on my exhaust valve)
Piston 4: 210 and 9%

So I will run a SeaFoam treatment to hopefully lower the compression to about 200 and reduce all the leakdown results to under 10%. With those numbers it seems like my engine is ready for TURBO baby!!!!
Oh, by the way, it's a 1999 LS motor with 190,000 KM (or 114,000 milles for my American friends)</TD></TR></TABLE>

Better than new



Probably a lot of carbon on the pistons.

 

Actually a guy in Limoge (30min from Ottawa) did it for me. He does this as a hobby but he is great! if u want his contact # let me know.


And yes there seems to be abit of carbon build up, hopefully seafoam does the trick! but even if it only lowers it abit, I beleive the engine will still be perfect for Turbo.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by carlos11 &raquo;</TD></TR><TR><TD CLASS="quote">Actually a guy in Limoge (30min from Ottawa) did it for me. He does this as a hobby but he is great! if u want his contact # let me know.
</TD></TR></TABLE>

That's Leemogees!

PS I would check with B17 before giving out his contact info

 

haha! yeah I would check with him before for sure!

ps. love the avatar!!!

 

Thanks!

You on CI.ca?