If I purchase a poulan chainsaw with the 46cc engine, are there any modifications that have to be made to the engine case? For example, any mounting flanges that have to be cut off etc?

Most of the 46cc engines have rails like a glow engine. So one of the large glow mounts can be used.

The hardest thing is the carb. The carb is mounted to the case, not the engine. It uses a rubber manifold to the engine. With the case gone, there is nothing to hold the carb in place. The engine has a flange with a oval tube sticking out. You will have to make an adapter to bolt on the carb. I have also seen the maniold cut down and a support bracket used to hold it.

If you want to save weight, you can machine down the fins. They are bigger than they need to be. Also, machine the fins off the flywheel. I used an old-style Q-42 prop adapter. I also cit off the rear shaft to save weight.

I added electronic ignition. Really helped starting and the power. Without it, you'll need an electric starter or something like a jump start. These are hard to hand flip.

Do yourself a favor and get the 44cc version. The carb adapter for 46cc is a major PIA to to and get reliable. Otherwise, its a easy conversion. I'm using a GP mount to put mine in a TX Hurricane. The mount is the same one that comes in the Patty Wagstaff Extra 300. I'm running the CH ignition.
Z

Yes, on my 46 (now 50), I ended up attaching the adapter with AlumiWeld. It kept coming loose. The adapter did not fit real snug and use setscrews to hold it. It ended up cracking the throat.

I have seen one with a 'Z'-shaped bracket that went from the mounting rail and fit between the carb and the stock manifold. Seems to work well.

The 44 may be a good option. But this 50cc is real nice. Much more power than the 46. Probanly due to more compression.

Send to Bill at Ch in wyoming. he can fix it.

Try a carb adapter from Scott Baldridge. He makes them on CNC equipment, and they're really nice. You can find him at

[link]http://scottbaldridgeconversions.com[/link]

Hey Scott, which one of the Poulan chainsaw models is 50cc?

Does the 50cc have the mag on the jug and side rails like the 46cc?

Any pcitures of the 50cc?

Are they available as reconditioned units from anywhere?

Thanks

Norman

Don't know.

I got the Farm Hand 2750 from lawnstation.com. It was a piece of junk, bad carb (could be cleaned), flaky coil, cylinder had lots of carbon buildup and low compression.

A buddy of mine got the 50cc chrome cylinder, I don't know what model it is from. Actually the only parts from the original saw is the crank and the bearings. Everything else had to be replaced.

scott how does that muffler sound loud quiet or in the middle on the 50 Kenneth

Not too bad, a little noisier than I like on the ground, but sounds good in the air. Half as loud as one of those B&B "Noise Diverters".

I later modified it when I put the poulan on the Christian Eagle. I cut the pipes off and mounted them on the other end. This kept the case of the muffler inside the cowl.

I have made my own mufflers. I do mine a bit different. Yours was basically an open chamber with standoffs around the bolts.

On mine, I use a U-shaped piece of metal that surrounds the port and bolts. This prevents the case from compressing but also prevents the flow from going straight out the exhaust.

I was going to have you build another with the can inverted and a baffle (really needed as the pipes are real close to the port.) But, wanted to get in the air so broke out hacksaw and AlumiWeld .

Attached is a pict of a muffler I made for a G-62. It was real quiet considering its size (3x3x1) and the power. It workes great. I extended the tubes inside with holes. This worked fine. The second one I built just has the tubes out the bottom (non inside), it was a bt noiser but still quiet.

Also attached is a drawing of my design.

I have been thinking of putting in a baffle it seems some want one but most would not want the restriction i guess they might lose a couple hundred rpms

From the few i built, as long as the area around the baffle is greater than the size of the tubes, it is fine.

The one I built for the G-62 suprised me, less than a 100 rpm difference than a B&B muffler. Much quieter and it idled much smoother. About as quiet as the crappy stock can muffler, but several hundred RPM gain.

Another member at our club has made some with baffles and they were just ok. His had very small chambers. I suggested the chambers needed to be at least the CC of the engine. I had read a thread that the first chamber should be 1.5x the CC of the engine and the two chambers should have a 1.5:1 volume ratio to prevent loud resonances. Once he made the chamber larger they worked fine.

IMHO, the baffle would have little effect. At high RPM's maybe. As long as the volume above the baffle is large enough to accept most of the exhaust volume.

I think I calculate your can has a volume of over 200cc. That is huge. Dividing it up with a baffle should have little effect. There is still plenty of volume to dump the exhaust charge and then plenty of time for the exhaust to work its way past the baffle and out.

Which Christen Eagle version do you have? I was considering this engine for a Byron Christen Eagle. I think this is what you have, you stated Christian Eagle, but I'm sure you meant Christen.

oops, yes it is Christen Eagle.

It is a Great Plane 1/3 scale CE.

The 46 or 50 would be good for this plane. Not for 3D, but general use. Mine on the 50 will barely hang on the prop.

Scott,

Is the carb intake the same on the 50cc Poulan as the 46cc Poulan?

Scott B

Yes, the cylinder is identical except for the bore.

That is as long as your old cyl has the same type of bearings. There are two different types on the 46. Mine was different.

Which models have what style bearings? thanks