does anybody know anything about this engine and would it be worth converting

Hi Mike,
Why don't you upload a picture of it. I think it is a trimmer engine. McCulloch trimmer engines came in three types that I know of. The most common are the 28cc and 32cc engines. they make good airplane motor, but are on the heavy side. Then there are the rebadged Poulan/Weedeater engines that have been seen in Europe. Also there are the Echo/Kioritz style Mac's which are 18 to 21cc. They all can be converted to plane use.

Dave

i would like to but dont have a digital camera is there a number stamped on the engine to show what cc it is

Hi,
The most common trimmer engines are the 28 and 32cc which have the size cast into the cylinder mounting flange just below the exhust port. Here are pictures of two trimmer types and a saw engine.

Dave

dave i took the muffler off and pulled the mag off and no numbers under the muffler the modle number is 400029b also when i pulled the magnetooff it has 2 slots for the sheer pin whitch one do i use to time it with

Hi Mike,
Does it look like any of the three engines in my last post? The one on the left is a saw engine. The one in the middle is a standard trimmer engine. The one on the right is a Roadrunner trimmer with a Echo style engine. It is hard to answer questions without knowing what you have or exactly what you are describing. You may have an old engine with points. Engines produced in the last few years just have a flywheel and coil. The flywheel is keyed to the shaft and the coil is mounted in a fixed position above the flywheel. All you di is set the clearance between the coil and flywheel. Since you do have internet access, just do some searching for McCulloch on the net. When you find a picture of an engine that looks like yours, save the picture to your harddrive. You can upload it in a post so we can see what you have.

Dave

found the manufactoe its a 21cc would it be worth converting if so what size/weight airplane and prop size

ps the phone number for the older macs is 479-996-6844 michael

Hi Mike,
The 21cc Mac was the engine on the right in my post above. It is a Echo style engine with dual counter weights and built in mount. The shaft stud should be 8x1.25mm. I am converting one now from a Mac Roadrunner trimmer. The flywheel is heavy and the ports are small. I plan on triming the flywheel and advancing the port timing. It will weight about 3 and 1/2 pounds ready to fly with magnito ignition. It will swing a 15 or 16" prop close to 8,00rpm with a 9 or 10mm carb. In glow terms it will have the power of a good .75ci with the weight of a 1.8ci. You can figure a gas engine willproduce about 2/3 the power of a glow engine at about double or more the weight.


http://www.rcuniverse.com/forum/m_31...tm.htm#3229361

Dave

hi dave i found a 18cc homelite all ready converted with spiner and prop shaft and mounts the person said it spines at 11,700 rpm with a 16x6 prop total wt 3.5 lbs he also said it pulled his 13lb lanier stinger 120 around just fine if its true i think it you be just fine for a spad to the bone corocub wingspan 76" lenght 47" wt 6.75 lb rated engine 40-60 what do you think iam new to gassers

Hi,
I think much of what you were told is sales pitch(BS). A Moki glow 120(20cc) turns 9,000 with a 16x8. A OS 1.08 (18cc) turns 8,900 with an 16x6. These are very high perforance glow engines with rotary valves. A piston ported or reed valve conversion is going to have a hard time competing wih them and they don't get close to those numbers. They also weight almost half as much at two pounds. The sad turth is that a 25cc magnito engine weight almost as much as a 50cc mag engine. If you can see it run it would be good. Don't pay much for it. You can pick up used conversion on RCU classifieds cheap everyday. I don't think that Homelite has made engines that small in a while. Anyway take what people say with a grane of salt.

Dave

hi dave i will take your advice and ask him a few more questions i was only going to go sa high as mabey 20 dollors the spinner and prop hub would be worth that and i will ask about the carb if its stock or not

that motor in the middle here what brand is it. it looks like a motor ive got but its under the name talon. i need to know some things bout that motor coz mine has died

Hi Dan,
The middle engine is a McCulloch 28 or 32cc trimmer engine sold in the US as McCulloch. They aren't made here anymore. What is wrong with yours?

Dave

well i had it straped to my bike... and i was riding it a little hard and the casing mould behind the flywheel broke. i fixed it but now the magneto wont fire the plug any ideas? i reset the magneto over and over again but i think its BROKE!! at the moment im waiting to get a new motor

Well, can't resist.

My Kioritz 23.6cc converted to glow but running a gasoline/ethanol mix weighs 2 lbs. 5 ounces and turns a 16 x 8 at close to 9000.

!Vale la pena!

AV8TOR

Hi aidaniel,
When you repaired the coil mount, you may have changed the gap with the flywheel or timing. Loosen the coil and slip a playing card between the coil and the flywheel magnets, then tighten the coil screws and remove the card. the gap should be between 0.25 to 0.6mm. Eight to 15 thousands of an inch. Do you guys use inches down under? If the coil is in about its original location and doesn't drag on the flywheel you should be ok.

Dave

g'day davewallace

'down under' we use millimetres. n e way, when i fixed it i only had to remake one of the mounting points. with the coil, i tried over and over again using different thicknesses of paper and card. the best i got was a weak spark but it only came up every now and then. the other problem might be because it was straped to my bike it jumped around alot. the coil and the flywheel knocked against each other all the time and now they are both worn a little bit. so with this info any other ideas? also i am putting a 25.6cc 'pope' motor (dont know what there called there) into a car and was wondering if leaveing the flywheel and coil on there would be alrite. any tips on this idea as well would be great.

Hi
I am going to put a 25cc Toro into a car also. I am going to leave the plastic housing,clutch and flywheel in place. This will give me a clutch and good cooling thats required. The pull start will also be retained. If you look at how some of the guy setup their boat motors on the net, you will get the idea. Think that I am going to cut down the plastic in the shaft area, so that I can mount a sprocket in the clutch drum. I can use a bike chain for drive giving easy gear ratio changes. Now all I need is a good used quarter scale chasis.

Dave

hi again,

its like you red my mind! but instead of putting the sproket on the clutch i was going to put it on the shaft and run an outboard bearing. im making the car from scratch though. im going to build the chassis and the wishbones for the front out of ally and not going to run any suspension on the back. if you've seen the raco jac rabbit then you'll get an idea on what im going to make it look like. im also going to run the chain straight to the back axel with a 2.5:1 ratio. any pics of yours while you built it would be great so i can see if its anything like what im making.

hey dave

long time since i've brought any info on my motor but i thought i'd let you in on what happened to it ... when i was setting the magneto i tried over and over to get the gap rite but i think when i fixed the plate i knocked it about 2 degrees out from original. i finally got it sparking after trying for about 3 hours but the only way it would work was if the magneto rubbed on the wheel on the opposite side of the magnets. i thought this would be fine coz it would have to wear away soon enuf. HOW WRONG I WAS!!! when i was trying to start it it would pop a few times but it wouldn't kick over hard enough 2 get it running. after about 10 mins of trying to start it, i was kicking it over when all of a sudden the damn thing just exploded. it fill the surrounding area with white smoke and blew the air filter off the end of the carb. after this happened i gave up on starting it and just decided to dismantle it for parts for the new motor. when i was taking off the flywheel, i found the key had chewed out the inside of the wheel causing it to fire when the piston was at the bottom of the cylinder (the wheel had turned 180 degrees on the shaft). talk about your all time backfires ... LOL but now i got a new motor and i've done some killed mods so hopefully i wont break the mounting plate again.

aidaniel: Let us know how the next engine does. Better I hope!!!! Capt,n