Compression

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emdsapmgr

Supreme Mariner
Joined
Dec 9, 2005
Messages
11,551
Re: Compression

Which model? A a base model 150 may run 90-95 lbs, the 150S models have higher compression heads and should run 10 lbs more. Compression can vary 5 lbs between the two heads.
 
Faztbullet

Faztbullet

Supreme Mariner
Joined
Mar 2, 2008
Messages
15,620
Re: Compression

Anythig above 100psi is ok as long as others as within 10%
 
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kchighrider

Cadet
Joined
May 16, 2011
Messages
10
Re: Compression

Runs but all are around 80-85 I was told that this could be a low compression motor which could be around 90 which would be ok but 80 seemed low to me.
 
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emdsapmgr

Supreme Mariner
Joined
Dec 9, 2005
Messages
11,551
Re: Compression

Your base 150 model would have had small carbs and the low compression-bathtub heads on it from the factory. The 150 "S" models were the XP/GT engines, with large 175 (1 5/16") carbs, stiff motor mounts, vented cowlings, high compression heads, special paint/decals. Some of the S models ran advanced timing (depending on year).
 
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kchighrider

Cadet
Joined
May 16, 2011
Messages
10
Re: Compression

ok so I have the base model is what your saying meaning that the compression should be lower right? My question is what should it be I have heard 90 100 and 110????
THANKS
 
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emdsapmgr

Supreme Mariner
Joined
Dec 9, 2005
Messages
11,551
Re: Compression

Your compression readings are on the low side, but close to the 10% allowable variance. Not quite at the condemning limit at this point. I'd decarb the engine and see if the compression comes up slightly. It certainly won't hurt the engine and you may be happy with the results. See your Bombardier dealer and get a can of Engine Tuner-follow the directions on the can.
 
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