07-02-2020, 07:13 PM
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#1 |
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Member
Join Date: Jul 2010
Location: Melbourne Australia
Posts: 93
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Piston size
I have picked up a spare motor the piston is stamped Q4Q, do you think that is 40" over?
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07-03-2020, 01:05 AM
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#2 |
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Senior Member
Join Date: Jul 2018
Location: Spring Grove, Illinois
Posts: 855
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Re: Piston size
It may or may not be.
I know Hudsons in the 30s and 40s and other cars throughout the years had markings on the top of the pistons. Most of the times it is a manufacturing item, like a letter corresponds to piston size. I have only seen a single letter used, but I have not torn too many engines apart. If you could find out the manufacturer of the pistons, they could probably help you in some way. Btw, I checked google and could not find anything for a code like that.
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07-03-2020, 02:52 AM
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#3 |
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Senior Member
Join Date: May 2010
Location: Victoria, Australia
Posts: 1,028
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Re: Piston size
It could also be 040, which would indicate .040" oversize. Plenty of engines I've pulled apart have had piston sizes stamped in the top. STD, 020, 040, 060 etc.
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07-03-2020, 06:50 AM
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#4 |
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Senior Member
Join Date: May 2010
Location: Van, Texas
Posts: 1,122
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Re: Piston size
I agree with Dave in Australia's comment.
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07-03-2020, 07:43 AM
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#5 |
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Senior Member
Join Date: May 2010
Location: Long Island, NY
Posts: 2,046
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Re: Piston size
Measure the cylinder,s diameter about one inch below the deck. 3.875" + 0.040" = 3.92" is a ballpark estimate of the cylinder's diameter for an 0.040" oversize.
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Bob Bidonde |
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07-03-2020, 09:28 PM
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#6 |
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Senior Member
Join Date: Nov 2018
Location: Farmington MI
Posts: 113
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Re: Piston size
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Joe B |
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07-03-2020, 11:41 PM
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#7 |
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Member
Join Date: Jul 2010
Location: Melbourne Australia
Posts: 93
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Re: Piston size
The bore measures about 3.913 so that must be 40 over
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07-04-2020, 06:17 AM
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#8 | |
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Senior Member
Join Date: Sep 2016
Location: Roanoke, VA USA
Posts: 1,000
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Piston size
Quote:
Or, maybe eyesight was so bad the installer could not tell the difference between “O” and “Q”? Sent from my iPhone using Tapatalk |
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07-04-2020, 10:02 PM
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#9 |
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Senior Member
Join Date: Dec 2014
Location: Nevada
Posts: 114
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Re: Piston size
Standard bore is 3.875 plus .040 is 3.915
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