Onan Engine Project 

Or an ultralight aircraft. That's a good motor to use.

Actually im in the process of putting an onan engine on a gokart, big issue with mine is the driveshaft is 1-1/2 inch in diameter and the biggest clutches and torque converters only come in 1 inch diameter. So as of right now im seeing how id run a jackshaft with a torque converter.

@@absolutelyphucked150 A torque converter? That would have to be one heck of a go kart. Sounds like you're putting an automatic transmission in it.

@@Cat-fy5lw these engines are heavy duty cast iron and weigh a lot not running fast enough or light enough for an aircraft

Unfortunately I only buit 3 of them after I found one and then bought a bulk lot of 4 engine in rough shape that needed some work. I had to order all the parts on ebay. Exhaust components were the hardest to find because the steel seemed to thin for use as headers.

parker stutsman yeah :) it’s such a dumb thing to get stuck on too so unless you have a welder, pipe bending skills, and the tools to cut the flanges it’s a major pain. I’m putting a points box on now and it’s so unclear how to adjust everything to get it right.

Nice.

Correct. Just for the startup I left the sheilds off the bottom . The front shroud is enough for a short run. The final assembly had all the sheilds installed

Does it use a pickup at the flywheel or points like my engine?

@@parkerstutsman7181 pickup at the crank shaft. I have taken the plugs and zip tide them to the muffler pipes. Crank it over and both plugs have spark. I see plenty of fuel at the plugs.........

@@vincentprocaccini i feel like it has to be due to timing. But one thing about these engines that you won't notice easily is if the cank and cam are not timed correctly. Its easy to tell by taking a head off and turning the engine slowly. If you can clearly see each stroke and get to the ignition pickup point on the crank just before top dead center with both valves closed you can verify you are close. I would be willing to say you may be seeing ignition just before your intake at the end of an exhaust stroke.

@@vincentprocaccini also reason I say its hard to notice is because your valves will never impact the cylinder head which makes this a great engine to learn to rebuild. Hard to really damage much.

parker stutsman copy. Thanks so much for monitoring your site. I will give it a close look. Thank you

Do yours idle high

I've rebuit 2 and restored parts for sale. I haven't done them in a while now. I have a miata I'm almost done with and 2 polaris ATVs that had engine rebuilds now. If you believe the engine has just typical wear then it would be good to rebuild. Its when you have to buy a new block that the choice is hard. I'm not sure I am ready for another project just yet.

parker stutsman yeah the blocks good just needed pistons rings and the cylinders honed. It smoked

I am guessing this as an 18 horsepower ?

Is that the same one as the onan performer 18 xsl see I don't know because it didn't have one side cover to it just the front cover I need to know if if uses points or a condenser on the coil My onan gt 19.9 does have points and a condenser but not the 18

Life not lite

I belive the motors are very reliable, they are simple and built well. They used these engines in kit aircrafts. I've seen many people say they get 1750-2000 hours. The issue is lubrication of the cylinder walls. Being opposed and laying on the side rings wear out and can cause cylinder wall wear.

Thanks

Change oil and filter and air filter and do maintenance and take care of it and it will outlast you

1.25

mine is 1-1/2, i also think i have a different onan engine though.

The p series’s have usually 1-1/8

I sold the fully built green motor for 850+shipping. Which was less than it should have been but I made some money.

Unfortunately not sir