Crankshafts

Stroker Crankshafts for all makes and models of tractors. 

Increasing the stroke adds Cubic Inches and most importantly TORQUE and HORSEPOWER!!!   One of the most effective changes you can make to your engine is to increase the stroke.

 

Farmalls, Olivers, AC, Massey, Deere, Ford, you name it, we can stroke it.

 

John Deere 7.5” B Crank shown, but most models can be stroked.

 

Cranks can be stroked to many sizes.  Common Sizes listed for several popular models.

 

Farmall H/300     5.5” -5.75”

Farmall M/400     7.0”-7.5”

John Deere B       7.0”-7.75”

John Deere A       9.0” - 9.25”

John Deere G       9.25” - 10.0”

Crankshaft Questions and Answers:

· Q.  Where did you come up with these numbers?

· A.   These are strokes that are moderately difficult to install in the engine and provide a balance of power and durability.

· Q.   I don’t understand, what is so hard about installing a stroker crankshaft?

· A.   Installing a stroker crank is not like rebuilding a stock engine.  For one thing, it’s not going to fit without a little help.  That help usually comes in the form of a 4.5” angle grinder.

· Q.   So why not a 9” Farmall M crank or a 12” JD G Crank?

· A.   That’s easy.  It won’t fit in the block, clear the cam, etc.  Oh, and it would break.

· Q.   What is meant by “Offset Grind”?

· A.   This is a low cost option where the crank isn’t welded, it’s just reground with smaller “Offset” journals.  The “back” of the journal remains fixed and the inside of the journal is ground away to increase the stroke slightly.  Different rods (often stock rods from a different model) are used and often inexpensive M&W pistons.

· Q.   How much HP is gained by an offset grind?

· A.   In reality, the minor increase in stroke does not make a significant impact on the HP of the tractor.  The real benefit to the offset grind is that since you are using stock parts, it is very reliable and relatively inexpensive.  Most of the HP gains are from increasing the compression, not the small amount of added stroke.

· Q.   So should I do an offset grind?

· A.   This is not recommended in most cases due to the time and work it takes to pull a crank, have it modified and install it.  Look at it this way, you spent all day pulling the crankshaft out of the tractor, spend an extra day putting the big one in to maximize HP.

· Q.   Can I stroke it a little bit this year and next year if it’s not big enough go a little bigger on the stroke?

· A.   Sorry, once it’s been welded and ground, it is what it is.