The Ford Barn

Yoyodyne · 05-13-2012, 11:17 PM

When I see a cam gear described as .003, .005 etc, what part of it is oversize? Or undersize?

Pete · 05-13-2012, 11:55 PM

I saw one about 20 years ago that had a plus sign ahead of the .003. (+.003)
It was .003 over on the pitch diameter, not the OD.

40 Deluxe · 05-14-2012, 12:49 AM

I believe it's the thickness of the teeth, to compensate for a worn crank gear. The crank gear has half as many teeth as the cam gear, so will wear faster but the cam gear is easier to change in the vehicle.

deuce_roadster · 05-14-2012, 10:03 AM

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If it was a - dimension it probably would be for when the mains are line bored and the crank is closer to the cam.

05-13-2012, 11:17 PM	#1
Yoyodyne Senior Member Join Date: Nov 2010 Location: Lancaster PA Posts: 535	Oversize cam gear? When I see a cam gear described as .003, .005 etc, what part of it is oversize? Or undersize?

05-13-2012, 11:55 PM	#2
Pete Senior Member Join Date: May 2010 Location: Wa. Posts: 5,408	Re: Oversize cam gear? I saw one about 20 years ago that had a plus sign ahead of the .003. (+.003) It was .003 over on the pitch diameter, not the OD.

05-14-2012, 12:49 AM	#3
40 Deluxe Senior Member Join Date: May 2010 Location: now Kuna, Idaho Posts: 3,779	Re: Oversize cam gear? I believe it's the thickness of the teeth, to compensate for a worn crank gear. The crank gear has half as many teeth as the cam gear, so will wear faster but the cam gear is easier to change in the vehicle.

05-14-2012, 10:03 AM	#4
deuce_roadster Senior Member Join Date: Oct 2011 Location: Shelton, WA Posts: 3,800	Re: Oversize cam gear? Sponsored Links (Register now to hide all advertisements) If it was a - dimension it probably would be for when the mains are line bored and the crank is closer to the cam.