Johnson Outboard Compression Chart
Hey folks,I was wondering if anyone had an idea of the compression specs for 1986 GT200. I have searched the web and found nothing but conflicting information.
I have seen at the top end stating that 120 psi per hole is spec, I have also seen as low as 80 psi for these as being common. I know that as long as all holes are equal, then there is not to much of an issue, but I would like a base number to go off of.
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I know that this engine is a 2.7L Bridgeport looper engine, with the high compression heads, but everything that I can find gives relatively low compression values for this engine. I always went with the rule of thumb of 110 - 120 on an average engine and 130 - 140 for high compression engines.
Can some one please help? In addition there is mixed reviews on compression testing and whether to perform them at operating temp or at ambient temp. I see the reasoning behind doing them at both temperatures, but what is the most beneficial in your opinions?Thanks in advance. So here is the story, I have no real engine complaints other then as of late it has been harder to hit max rpm in the boat when loaded with a few bodies. It makes no difference whether I run the speed wheel (30 pitch chopper) or the cruising prop (4 blade 23 pitch).
So I was thinking that maybe I had a compression issue, even though it starts fine. So I did a compression check on the engine at ambient temp and it cleared 88 to 90 on all cylinders. Sounded low to me, but they are all the same. I checked the old interweb and found a forum saying that this was normal for the v6 loopers.
Sounded weird, but I went with it. The motor still runs great, but it now feels a little sluggish out of the hole. It might be all in my head after seeing what I think are low numbers but now I am starting to question if I should be throwing some rings at it or even a full on rebuild.
Any thoughts?Thanks. So I pulled the plugs today and stuck a bore scope in to see if anything looked abnormal and everything looks fine. I performed a leak down test and there was no leakage. Frank you were right, this thing is still tight. I decided to pull off the air box and have a look and I noticed a couple of things. The first was that it had no guts to the air box (which I am told was the case for the 225hp). The second was that there was a lot fuel/oil pooled in the bottom of the air box as well all the lines and carbs were covered.
I looked into the carbs and noticed that one of them had blown/pinched mounting seal sticking out. I have ordered a new seal and plan to perform a de-carb on it this week. Could this seal be the source of the fuel in the air box?
Johnson Outboard Compression Chart Pdf
Or could the jets be sized incorrectly? I would suspect that it could certainly be the source of my performance issue.Frank hopefully some day I will be able to get that monster 3.3 built as we had discussed earlier in the year. There needs to be a couple more big johnrudes on Pigeon and Sturgeon.Thanks.