Increased HP in a CUB

ESKAY · Aug 16, 2010

If I was to bore the cylinder and icrease the size of the pistons to say 30 over how much increased HP could I expect ? Thanks

Hill-Billy Rock-Star · Aug 16, 2010

You won"t gain enough HP to make it worth it if the engine don"t need a rebuilding anyway.

teddy52food · Aug 16, 2010

I didn't do the math, but on those small bores ,the increase wouldn't amount to much. Maybe a cubic inch or two.

d. coleman · Aug 17, 2010

you might try a set of "domed top" pistons to increase compression, but i dont think the differance would be very noticable. like the previous post the small size of engine is limited to horse power output. d.coleman

Matt L · Aug 18, 2010

Im gonna do the pop up pistons in mine someday.

But for now I turned up the governor speed like the 154/ 184 lowboy. It helped alot on the hills.

Few weeks ago I broke the exhaust pipe and had to take it off to fix it. I bead blasted all the junk outta the manifold while I was at it. Aso took the die grinder and did some mild porting/ cleaning up the casting flash. It helped a touch, but its a 60ci engine. I found its easier to hop on a bigger tractor.

mkirsch · Aug 18, 2010

Porting and polishing and overboring by .030 gives you what, 10-20 HP on a 300HP engine?

A Cub engine is 9HP.

The increase is going to be proportional. Best case is .6HP. You could do better by getting off and pushing.

Increased HP in a CUB

ESKAY

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Hill-Billy Rock-Star

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teddy52food

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d. coleman

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Matt L

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mkirsch

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