The Ford Barn

34 FORDOR · 04-29-2024, 04:42 PM

Hi guys Iam having a sort out. I have a French crank was told it’s 4 inch but haven’t checked measurements. It has several numbers on it a cast one and stamped one as well . Do these help id it . Thanks in advance.

petehoovie · 04-29-2024, 05:43 PM

Quote:

Originally Posted by 34 FORDOR

Hi guys Iam having a sort out. I have a French crank was told it’s 4 inch but haven’t checked measurements. It has several numbers on it a cast one and stamped one as well . Do these help id it . Thanks in advance.

Ronnieroadster · 04-29-2024, 06:17 PM

Its actually easy to measure the stroke if the crankshaft is not in a block.

Here's how I do it. Place a block of wood under the front and rear main bearing surface here in the U.S. I simply use a 2x4. Next rotate the crankshaft so the front rod journal is at its highest point. Now I use a carpenters adjustable square I make sure the steel scale is touching the same surface where the bottom of the blocks are sitting. Now place the adjustable square on top of the rod journal now lock it in place and mark the steel rule at the location of the square that's touching the rod journal. Next and final step rotate the crankshaft so the rod journal is now all the way down and then using the square slide it down the ruler scale until its touching the top of the journal lock the square at this position you can now measure the dimension of the stroke. Measure between the square edge that was touching the rod journal and the mark you made above on the ruler hopefully it reads 4 inch.
Ronnieroadster

34 FORDOR · 05-04-2024, 07:48 PM

Ronnie , I measured it up as you described and confirmed it’s a 4 in stroke crank .
Thank you

Ronnieroadster · 05-04-2024, 08:32 PM

Sponsored Links (Register now to hide all advertisements)

Quote:

Originally Posted by 34 FORDOR

Ronnie , I measured it up as you described and confirmed it’s a 4 in stroke crank .
Thank you

Your Welcome

04-29-2024, 06:17 PM	#3
Ronnieroadster Senior Member Join Date: Dec 2010 Location: East Coast in CT Posts: 1,552	Re: French Flathead Crankshaft Its actually easy to measure the stroke if the crankshaft is not in a block. Here's how I do it. Place a block of wood under the front and rear main bearing surface here in the U.S. I simply use a 2x4. Next rotate the crankshaft so the front rod journal is at its highest point. Now I use a carpenters adjustable square I make sure the steel scale is touching the same surface where the bottom of the blocks are sitting. Now place the adjustable square on top of the rod journal now lock it in place and mark the steel rule at the location of the square that's touching the rod journal. Next and final step rotate the crankshaft so the rod journal is now all the way down and then using the square slide it down the ruler scale until its touching the top of the journal lock the square at this position you can now measure the dimension of the stroke. Measure between the square edge that was touching the rod journal and the mark you made above on the ruler hopefully it reads 4 inch. Ronnieroadster __________________ I use the F word a lot no not that word these words Flathead , Focus and Finish. "Life Member of the Bonneville 200 MPH Club using a Ford Flathead block" Owner , Builder, Driver of the First Ford Flathead bodied roadster to run 200 MPH Record July 13, 2018 LTA timing association 200.921 in one and a half miles burning gasoline. First ever gas burning Ford flathead powered roadster to run 200 MPH at Bonneville Salt Flats setting the record August 7th 2021 at 205.744 MPH

05-04-2024, 07:48 PM	#4
34 FORDOR Member Join Date: Jul 2010 Location: Canterbury, New Zealand Posts: 97	Re: French Flathead Crankshaft Ronnie , I measured it up as you described and confirmed it’s a 4 in stroke crank . Thank you