WD45 piston difference

David Maddux · Dec 27, 2008

I understand the 45 pistons ar concave as where the WD's are flat top. Other than that, is the height from wrist pin to top of piston the same?

jd plowboy · Dec 27, 2008

they have different compression heights

Anonymous-0 · Dec 30, 2008

JD Plowboy is correct. Remember that a WD 45 has a 1/2" longer stroke. Using the WD 45 pistons in a WD with the WD crankshaft will give poor performance because the compression ratio will be very low. Using WD pistons in a WD 45 engine will result in a very high compression ratio that I have been told requires premium gasoline and is appropriate only for short runs like in a tractor pull. Also makes it hard to start with a 6 volt system.

WD45 piston difference

David Maddux

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jd plowboy

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Anonymous-0

Well-known Member

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