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Cub engine rebuild

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gary magee

01-13-2008 12:27:18

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I am doing a complete rebuild of my 1962 cub engine. I can regrind the crank but the rest of the internal parts are beyond use. I will need to rebore but am not sure yet mow much. I am wondering about using the high compression pistons to gain the hp up to 18 from 10. Am wondering about about both avaliability and advisability of doing this vs just staying with the regular pistons? Gary

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gary magee

01-14-2008 04:52:36

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Re: Cub engine rebuild in reply to gary magee, 01-13-2008 12:27:18

I want to thank those that responded for pointing out the many flaws in my overly simlistic idea for adding more power for what looked to be hardly any difference in cost. I'll just leave it at original but oversize specs. Thanks, Gary

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gary magee

01-14-2008 04:54:04

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Re: Cub engine rebuild in reply to gary magee, 01-14-2008 04:52:36

Thanks for the info. I'll stay fith the original specs in oversize! Gary

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El Toro

01-13-2008 18:26:02

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Re: Cub engine rebuild in reply to gary magee, 01-13-2008 12:27:18

Your local auto machine shop can measure the block
and determine how much to bore it oversize. They can probably get the os pistons and rings too.
Have them to do the valves too. Hal

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mkirsch

01-13-2008 17:14:51

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Re: Cub engine rebuild in reply to Nebraska Cowman, 01-13-2008 12:27:18

If your idea of 10HP is based on the tractor's performance before the rebuild, you're in for a surprise. A badly worn engine won't be putting out anywhere near its rated HP. You'll be lucky if it had 5HP.

Domed pistons alone won't get you 18HP. The biggest contributor to the higher HP is the higher RPM that the last engines were running at. A good rebuild and breakin will get you about 12HP.

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r4etired

01-13-2008 17:06:01

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Re: Cub engine rebuild in reply to gary magee, 01-13-2008 12:27:18

Remember you do not have a water pump.You might have some cooling problems with increased hp

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teddy52food

01-13-2008 13:43:35

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Re: Cub engine rebuild in reply to gary magee, 01-13-2008 12:27:18

Find out and get oversized pistons before you bore it. Mike the cylinders just below the ridge as that is where they are wore the most.

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