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Help with engine ID

Old 06-17-2009, 10:21 AM
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iwannaknow
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Default Help with engine ID

This is out of a "Yardworks" 32cc string trimmer (MTD), i bought it in 2004 and want to convert it for use in a plane. The carb is not working, what should i look at doing to this engine (carb, ei, muffler etc) and would it be a suitable plane engine.
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Old 06-17-2009, 11:40 AM
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tkg
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Default RE: Help with engine ID

Its a Mac 32cc. It looks like a long shaft
CH Electronics has a EI conversion. 119.95
307 857 6897
Old 06-17-2009, 11:49 AM
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w8ye
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Default RE: Help with engine ID

With the ignition system from CH, you can remove the front shroud, cut down the rear back plate and the engine will look like it was intended to be a model airplane engine.

With a Walbro 11mm carb like a WA167-1 or WT499 it wil, turn a 18-8 prop around 7500 rpm.

I have two of them.

13 pounds thrust and 50 mph
Old 06-17-2009, 12:09 PM
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iwannaknow
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Default RE: Help with engine ID

Thanks guys, thats a great start. I'll search for pics on an aready modified one so i can gage what i am doing as i cut fins etc. Your help is very much appreciated.
Old 06-17-2009, 12:27 PM
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rangerfredbob
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Default RE: Help with engine ID

look at my post a little way down, engine choice for a ultra stick lite or something to that effect, a couple posts from the end are pics of my engine on EI
Old 06-17-2009, 02:56 PM
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bcchi
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Default RE: Help with engine ID

www.carrprecsion.com
Old 06-17-2009, 03:30 PM
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w8ye
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Default RE: Help with engine ID

for some unknown reason "www" no longer works Don't ask me - I know not why?

Try http://carrprecision.com
Old 06-17-2009, 10:01 PM
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Twin Star
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Default RE: Help with engine ID

I have two Mac 32s, but I heard there kinda weak so I wasn't too excited to convert them. Should I reconsider.
Old 06-17-2009, 10:08 PM
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rangerfredbob
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Default RE: Help with engine ID

mine is about the only conversion engine I've had running a prop, and I think it has about the power of a zenoah 26 (that's what I was going for at least on the plane I put it on)

most say the homelite 30cc is stronger, but if you have them runum...
Old 06-17-2009, 10:40 PM
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Default RE: Help with engine ID

There's not much difference between a Mac 32 and a Homelite 30 if all they have on them is 11mm carbs and open exhaust.

But the Homelites respond better to timing and combustion chamber changes

I have two Homelite 30's and two Mac 32's

One Homelite 30 is stock including magneto except for a 11mm carb and open exhaust and it runs the same as the one Mac 32 that is also stock except for CH ignition, carb, and exhaust.

The other Mac also has the cylinder and edge of the piston cut down by TKG. It is faster than the stock Homelite by a little over 150 rpm.

The second Homelite 30 has everything done to it that is practical for a airplane engine. It is 500 rpm faster than the stock Homelite 30 both with a 18-8 prop.

A Mac with CH ignition is a nice looking engine. Unknowing people will think it was manufactured to be a model engine.

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