The Ford Barn

Dave72dt · 07-11-2010, 08:48 PM

I know current production pistons are cam ground to compesate for heat distortion. Were they always cam ground or originally true round ground? If so, when did that occur?

36fordguy · 07-11-2010, 09:12 PM

they were always cam ground

Ross in East Texas · 07-11-2010, 10:47 PM

Not all manufacturers used cam ground pistons. It wasn't until the advent of aluminum in piston manufacture that cam grinding became routine. In Cushman engines the cam ground pistons didn't appear until the early 50's. Of course these were air cooled engines and had more radical temperature variations than a liquid cooled automotive engine.

trainguy · 07-14-2010, 12:36 PM

Many manufactures used split skirt pistons,Ford used them on the Model A.Phil

Hotrodster · 07-14-2010, 08:03 PM

Sponsored Links (Register now to hide all advertisements)

I have a Van Norman piston grinder which I'm sure is from the 1940's, that will grind them either way. I think that is the time frame (40's) when it became common.

07-11-2010, 08:48 PM	#1
Dave72dt Senior Member Join Date: May 2010 Location: SW WI Posts: 359	Cam ground pistons I know current production pistons are cam ground to compesate for heat distortion. Were they always cam ground or originally true round ground? If so, when did that occur?

07-11-2010, 09:12 PM	#2
36fordguy Member Join Date: May 2010 Posts: 73	Re: Cam ground pistons they were always cam ground

07-11-2010, 10:47 PM	#3
Ross in East Texas Senior Member Join Date: May 2010 Location: Longview, Texas Posts: 282	Re: Cam ground pistons Not all manufacturers used cam ground pistons. It wasn't until the advent of aluminum in piston manufacture that cam grinding became routine. In Cushman engines the cam ground pistons didn't appear until the early 50's. Of course these were air cooled engines and had more radical temperature variations than a liquid cooled automotive engine. __________________ Ross Murphy 1939 Ford Standard Coupe

07-14-2010, 12:36 PM	#4
trainguy Senior Member Join Date: May 2010 Location: Lehighton Pa Posts: 1,085	Re: Cam ground pistons Many manufactures used split skirt pistons,Ford used them on the Model A.Phil

07-14-2010, 08:03 PM	#5
Hotrodster Member Join Date: May 2010 Posts: 48	Re: Cam ground pistons Sponsored Links (Register now to hide all advertisements) I have a Van Norman piston grinder which I'm sure is from the 1940's, that will grind them either way. I think that is the time frame (40's) when it became common.