susanandlance
Well-Known Member
What would be considered good compression #'s on a 300 hr Mercruiser 8.1 Horizon, freshwater engine?
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I can't because it's not near me, I heard 120-140 but service dept will send numbers Tuesday, seems low to me but don't know if it was cold or hot check and leak down info...…..getting worried, service dept supposedly said great numbers for an 2007 with 275 hrs...……..The engine should be warm for the test.
Also get “dry” and “wet” numbers.
Called off the deal, too many what ifs!!!!!! Not to say that I'm not PISSED!!!!Is this boat/motor new to you ? 120-140 no effin good news there
Do the leak down, and listen to the air coming out your exhaust.
Yup Corvette would be an easier toy
Smart...don't need some ones worn out motorCalled off the deal, too many what ifs!!!!!! Not to say that I'm not PISSED!!!!
Numbers we're 123-130 across both motors, 270 hr. Fresh water boatView attachment 66846 130-175 is the range for a crusader 8.1 standard HP engine. HO is the same. I would think Merc should be the same. Important issue is all cylinders should be close to each other. Testing techniques can alter the results.
How long has the boat sat with the engines not operating? How was the compression test done?
I wasn't there Captronn, I assume cold because they were changing the plugs as well, don't know how long it satHow long has the boat sat with the engines not operating? How was the compression test done?
Understood, they were changing all the plugs and I requested a compression check, boat is 600 miles away, will be there for sea trial and surveyToo many variables here. Always ask for details, and if possible be there to see it done.