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01-21-2022, 06:20 AM #1
Fishing V6 piston clearance 2.0 vs 2.5
I'm looking at the specs in my manual for Mercury V6 135 150 175 200 225 (1992 up)
105 Jet/135/150 (2.0 liter):
Cylinder bore: 3.125"
Piston: 3.115 +/- 0.002"
Thus clearance is 0.008" - 0.012"
XR6/MAGIII/175/200 etc (2.5 liter):
Cylinder bore: 3.501"
Piston: 3.494 +/- 0.001"
Thus clearance is 0.006" - 0.008"
Why is the piston clearance so much higher on the 2 liters? Anyone can explain?
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01-21-2022, 08:45 AM #2
Maybe sleeve thickness.
RockTeam Junk
No sparkling wiggles in here, only dump truck grinches.
"Screamin Heathen"
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01-21-2022, 06:58 PM #3
That's weird, you would think it would be the other way around by .001 or .002
12 thousandths would be pretty sloppy. 2.0 may be a good motor to run forged pistons in. Although I do have one that squeaked a piston out in the shop. I think someone ran it out oil or water though.
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01-31-2023, 01:18 PM #45000 RPM
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I have a clearance of . 01 to . 012 on my 88 2.0 black Max is that acceptable. I'm going to hone and ring it.
They are Wiseco pistons.
Is that too much?1988 Bass Tracker 1800FS Tournament W/ Mercury 150 BlackMax 2.0
With a need for speed!!
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01-31-2023, 04:55 PM #55000 RPM
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