BCMA engine
 

I have a BCMA 40 or 44, I don't know which. Can anyone tell me how to tell. Plus where I can find info, or a manual on the engine.

I search and I can only find old threads on it, which don't answer my questions, and the web site everyone use to use, seems to be down

Pat

RE: BCMA engine
 

The BCMA is a re-branded SPE and also the same as a MT40

If I remember right SPE is now MLD

Any two stroke gas engine out of China will have about the same manual,

Milton

RE: BCMA engine
 

It looks like a 42cc poulan

RE: BCMA engine
 

Sure does, I never looked at the pictures before posting, Just has a RCexl ignition with a BCMA label.

The BCMA were rear mounted.

Milton

RE: BCMA engine
 

I am thinking the only thing that is from BCMA is the ignition.

RE: BCMA engine
 

Hey if it runs good...run it like you stold it. I am sure it is a Poulan. Capt,nhttp://www.rcuniverse.com/forum/js/f.../thumbs_up.gif

RE: BCMA engine
 

Thankyouall!
After your suggestion of it being a Poulan 42, I searched it, and it is a Poulan 42.
I will now find a plan to a plane that I can build for it. I have no idea what yet!

Thanks, Pat</p>

RE: BCMA engine
 

it actualy looks like one of my mufflers

RE: BCMA engine
 

I have been using one for about 5 years. It is currently installed in a Hangar 9 150-size P-47. Best prop for that setup has been a XOAR 19x8. Not as powerful as other engines in its class but it has been trouble free. I would be happy to answer any questions that you have if it would be of any help.

RE: BCMA engine
 

I'm not sure it is a Poulan 42cc. The Poulan 42cc had the ignition coil mounted in the chain saw; not on the engine. Looks like this engine has mounts for a coil on the cylinder. It might be a Poulan 46cc.

AV8TOR

RE: BCMA engine
 

Is it a simple piston port or is there a reed block in there?

RE: BCMA engine
 

It is piston ported. Here's a pic of a 42cc.

AV8TOR

RE: BCMA engine
 

thats the old style 42 they changed them for the EPA on the newer models. The 46cc has an oval carb adapter that slides on, but at this point it could be anything they all been sold and bought by so many companys.

RE: BCMA engine
 

Thanks guy's!

Here is some more pictures of it.

The exhaust has slots with nuts behind, to hold themuffler on.

What is the tubethat was added to the diaphragm cover for?

I got this engine in a trade, and I guess he didn't know what it is either.

Pat

RE: BCMA engine
 

The tube is so you can run a rubber line too the inside of the airplane to a place with dead air. Not always needed. For right now get it on a test stand or airplane to test run itand learn how to start &amp; run it. Also getting the carb set toothe right basic settings so it will run right. Capt,n

RE: BCMA engine
 

It might be a Homelite 45?

Doesn't really matter as long as it runs.

RE: BCMA engine
 

BCMA was run by a guy named Adam who lived in Colorado. He eventually gave up. The engines are made by SPE, and are 43cc. They are currently sold by Cermark and Chief RC.

RE: BCMA engine
 

It looks like you have yours on a stik. That is what I was thinking of building for mine. What inch wing do you have? What inch wing would you sudjest to use?
I'm going to scratch build mine so any size is ok. I'm thinking maybe a 70-80" wing. I have the plans for the 101" Bud Nosen big stik, that I could shrink down, or I also have the the plans for a 50" sweet &amp; low, that I could blow up. but I think I'd rather have a shoulder wing.

Pat

RE: BCMA engine
 

After looking at pictures of the SPE, they arenot the sameengines asmine.

Pat

RE: BCMA engine
 

I kinda agree, But! If I hang it on the nose of a stik, and someone say's Hey! whats the engine your running, and I say a Poulan 42, and someone goes, No it's not! it's a Homelite 45, or something else,don't you know what you have!, I don't want to say no I don't know!

Other wise I could care less. Like you say, as long as it runsgood, it'll fly a plane.
I don't care what it is, I just want to know.

20 some years ago I had a Homelite on a GP100" Cap 21, but it looked different. I don't remember what size it was now.

Pat

RE: BCMA engine
 

The fact is . . . The engine was part of a trade and you're not sure what it is? And what is important is that it flies the plane and you are having fun.

The Poulan and Homelites like this were made different 10-15 yrs ago than they are now. These brands are still made today but they are a different design. In fact, now the Poulan, McCulloch, and Homelite in 46cc are identical except for the color.

Some important identifying features of the engine are that it has what's called a bolt on carb and was not one that had the carb mounted in the chainsaw case with a rubber bellows connecting the carb to the engine like they are today. The other important feature is that the coil originally fastened to the cylinder on this engine and was not mounted in the chainsaw case.

Some other facts about the engine was that these designs were typically from 33 to 50 cc. What rpm it turns what prop might be the best judge of what size it is?

There were probably more 42cc engines made than the other sizes?

RE: BCMA engine
 

Here is a picture of a Poulan 46 and take notice that it has an adapter on the intake because this engine originally had a rubber boot to the carb. The carb was not a bolt on one.

http://images.rcuniverse.com/forum/U...95397_1454.jpg

http://images.rcuniverse.com/forum/U...31/Pj18958.jpg

http://images.rcuniverse.com/forum/U...31/Uo35146.jpg

http://images.rcuniverse.com/forum/u...30/Ig13411.jpg

RE: BCMA engine
 

Here are a couple pictures of a Poulan 42. Notice the bolt on carb and magneto

http://images.rcuniverse.com/forum/U...88/Mk26837.jpg

http://images.rcuniverse.com/forum/U...88/Zv66943.jpg

RE: BCMA engine
 

Later model Homelite 45 with the rubber boot type intake. There was a slightly earlier one with a bolt on intake

http://images.rcuniverse.com/forum/U...07/Ge95495.jpg

http://images.rcuniverse.com/forum/U...07/Rp44651.jpg

RE: BCMA engine
 

Studying all the pictures, I think your engine is a Poulan 42.

They should pull a 18 X 10 around 7200?

It is difficult to identify these as they changed little things from year to year?