Eagle stock stroke crank

[go302]

Just wondering if someone can tell me why the eagle stock store crank has a stroke of 3.544" instead of 3.543"? They have the same journal sizes and everything as a stock stroke crank except the stroke isn't the same lol.

 

[tjm73]

Zero point zero zero one. Let that sink in. 1/1000 of an inch.

Anyway, it's a rounding error when converting from it's true spec in mm.

 

[go302]

My bad it was a typo in the first post it's actually 3.554 so it's .011 bigger. I consider that a pretty significant difference

 

[tjm73]

Perhaps they did it to make off the shelf rods and pistons be closer to ideal quench.

 

[go302]

dont the stock pistons sit like .012 in the hole?

 

[tjm73]

Well deck height is 227mm, the rods are 150.7mm and the stroke is 90mm. The piston pin height is 31mm. So, that's 227-150.7-31-45(half the stroke) = .3mm. That works out to a .0118" below deck height. Add .010" to the stroke and you get better quench from off the shelf parts.