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EFV-8 Club Forum / 1940 Ford Discussion / confused or just ignorant 41 commercial

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Discussion Topic: confused or just ignorant 41 commercial

rustedorrotting

06-14-2022 @ 9:11 PM

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Posts: 50
Joined: Mar 2010

I have a unique problem. The rebuilt 41 v8 i purchased off from an engine stand years ago has 175# compression per cyl and i can't seem to get more than 13 inches of vacuum. I made my living as a mechanic and this smells of a cam and maybe it's been stroked. Any suggestions?

TomO

06-15-2022 @ 8:21 AM

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Most modified cam shafts were marked on the distributor drive. Look for a stamp or engraving on the face.

Tom

40 Coupe

06-17-2022 @ 4:04 AM

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Wow the compression is out of sight! usually about 90# on an original stock engine. I would agree with your suspensions.

carcrazy

06-17-2022 @ 12:46 PM

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That high compression could be due to extreme amounts of carbon and/or lead build up in the combustion chambers. Are the vacuum readings steady at idle? What is the altitude of your location? If your altitude is 6,000 ft. above sea level a vacuum reading of 13" Hg is about right.

37RAGTOPMAN

06-23-2022 @ 7:56 AM

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did you you try a differnt compression testers to campare, ?
low vacuum sounds like a modified cam shaft, also try another vacuum gauge,
does the engine idle and at what speed,
my 2 cents 37 Ragtopman

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