Hoosiers concern, and mine, is the front journal on the blower cars. The belt tension of the blower will fatigue the fillet after a while. No blower, no problem.  

Frank/Rebop

Bristol, In ( by Elkhart) 

Thanx John - that recommended corner radii was one of the basic things I was interested in.

 
 Steve Metzger       Tucson, Arizona

I wouldn't be concerned about the reduction in journal overlap on the mains. You will only be reducing the O.D. of the main .125" so this makes the reduction 1/2 that or .062". You are offset grinding the rods to increase the stroke and will be reducing the overlap by either .085" if going to 2.100" journal or .185" if going to 2.00" journal because all of the material is removed from the overlap side of the rod journal.

If the radius is properly ground you will not have a problem. Radius needs to be between .090 and .125". Larger is better but more care must be taken with a larger radius. There is a greater chance of the rod bearing riding up on the radius and pinching off oil flow off the bearing. Bearings require oil flow, not just pressure. Use narrowed bearings and check carefully that the rod can move up to the crank cheek and the side of the bearing doesn't get too close to the radius.

http://ford-y-block.com 

20 miles east of San Diego, 20 miles north of Mexico

Steve, Call Mummert or Ted. Either guy will be able to sketch it for you.

Frank/Rebop

Bristol, In ( by Elkhart) 

Google 'john mummert y-block' or 'ford y-block.com'. Toggle the subheading 'Technical'. From the list of technical topics that opens, toggle 'Crankshaft Identification'.



At the top of the page that opens is the crankshaft dimensional info. you are seeking.



Hope this helps.

NoShortcuts
a.k.a. Charlie Brown
near Syracuse, New York

Do what you think is best (both work well) and in the end you'll be happy.

Heber City, UT (15 mins outside of Park City- basically it's in the mountains)

55 Effie

Are there any drawings, sketches or machining diagrams available that show the crankshaft details we are discussing? I have found a what my partner in crime says is a decent 312 crank (has the right main journal size and no wounds anyway) - and I'm headed over to get it Friday afternoon. The business of the corner radii - and their impact on fatigue life has to be seen to be believed. It can drastically alter the life of a part - alonng with nicks and scratches you'd never suspect. So the whole thing will get a close going over before I get too carried away.......

The details of the tail end oil seal and slinger of the 292 are not familiar to me. I may have to just hunt down a junker to have a better look - but drawings would be a help.

 
 Steve Metzger       Tucson, Arizona

Some time back the factories used to roll the radius and undercut it. That's a fairly labor intensive operation or time consuming, depending on how it was done. the fact that they thought it was necessary should tell us how important they thought it was. As I remember Pontiac did this on some of the Ram Air motors which used cast iron (not steel) cranks. Actually they were nodular iron. Guys who didn't duplicate that feature on rebuilds wound up with rotating parts in the oil pan. Those cranks had relatively huge mains and large rods, a lot of journal overlap.

Frank/Rebop

Bristol, In ( by Elkhart) 

Jepito

What is your location? I`m in south west Ohio . I should have what you need , either a 312 block or C2AE ''292''  or other. If interested give me a call if no answer leave message & I will call back. Thanks  Harry Hutten 513-868-3311

I too prefer to make the crank fit the block.  I am very adamant about the radius though, I don't know how many times I've had to tell someone their crank is junk because a crack has started in a fillit with no radius.  I was fortunate to learn a long time ago how important the radius is, the first shop I worked for just wanted you to dress the edge of the grinding stone with a diamond "free hand" this was quick but not good enough.

   God Bless.   Tim                           http://yblockguy.com/

350ci Y-Block FED "Elwood", 301ci Y-Block Unibody LSR "Jake", 312ci Y-Block '58 F-100, 338ci Y-Block powered Model A Tudor

tim@yblockguy.com  Visalia, California    Just west of the Sequoias