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25cc homelite compression

Old 02-22-2007, 11:14 PM
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rivercityflyer
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Default 25cc homelite compression

How do you know how much compression is enough, and how do you check it? I used a screw-in automotive compression gauge and flipped the prop till it would'nt register any higher, i assumed that is correct(?). It was 90 lbs. I'm thinking it should be higher than that. this is a used engine, and thinking about converting it. thanks.
Old 02-23-2007, 12:29 AM
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Ralphbf
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Default RE: 25cc homelite compression

I maybe wrong but that is pretty good for a 2 stroke.
Old 02-23-2007, 06:50 AM
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w8ye
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Default RE: 25cc homelite compression

There's nothing wrong with 90 lbs dynamic compression.

Full size airplane internal combustion engines are measured by the leak-down-rate. With the piston at top dead center, a certain air pressure is applied to the cylinder through an orifice and the rate at which the pressure bleeds off is noted on a second gauge.

http://www.littleflyers.com/engcomp.htm

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