Re: Boring....What is it???

Posted by wdtom on November 17, 2005 at 17:18:59 from (155.212.223.19):

In Reply to: Boring....What is it??? posted by farmallman on November 17, 2005 at 06:31:05:

I will add to what Old said just a little. Boring increases the size (displacement) of the engine. Maybe not too much,but it does and this will increase the power. How much can you bore an engine? It depends on the engine. Older engines generally had thicker cylinder walls than newer ones. A .030" or .060" over bore is probably safe in most engines, getting up near .125" is probably shakey in most engines. Always consult your engine shop, they will probably know. Also, if it isn't safe to go to a certain size there probably won't be pistons available either. For a tractor the over bore kits are the way to go. Another way of increasing the power of an engine is "stroking" That is making the stroke longer for more displacement and torque. Longer stroke increases torque by giving the piston a longer lever to turn the crank. There are several ways to stroke an engine. One is to just put a crank in with a longer stroke, maybe from the same engine buy a larger version that had a longer stroke. Another way is to grind the crank throws off center, you can't go much longer this way. And the third way is to weld up the side of the crank throw that you want longer, then grind. This is not the easiest way to go. When stroking you need to have rods and pistons that are compatable with the stroke you end up with. You don't want pistons running into the head, or excessive compression. You need to know what is going on to do this. Or buy kits or parts from those who do.

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