can propane be put on a sammy motor? I want to know if there is way to get this thing to run upside down without doing an engine conversion.

sure, anythings doable ... i saw propane on a Toyota 22R a few weeks ago. I imagine with an already unpowered sami motor a propane sami motor would compare pretty nicely with a 5hp briggs I'd imagine. :D

- jack

Originally posted by morpheus
a propane sami motor would compare pretty nicely with a 5hp briggs I'd imagine. :D

- jack

bwahahah :laughing: :laughing: nice one



but i bet you could build up that samy motor to burn propane and have more then stock power

come on guys, think realistic................... 12HP lawn mower............:flipoff2: :flipoff2: , funny thing, i wheel a zuki but yet cutting them up..........:D

If you revise the timing and advanc curve to work with LP you should really be able to do it with very little power loss.

Of course on a sammi that could result in a complete loss of power......

To really utilize the LPG you should bump the compression up 11.1+

You do not have to raise the compression to get power out of LP, you just have to time the engine so that it makes use of the slower burn rate of LP. Upping the compression of the motor is just going ot make more power by creating a higher cylinder pressure before combustion, this applies to gas, LP, diesel, LNG etc... While propanes higher octane rating will help keep the detonation down it will stop detonation no more then gas of a simalar octane rating. Plus you get even further increased CHT over a normally hotter burning LP motor.

I had my distributor recurved and run a lot of initial advance on my 350 and get damn near the same power I did on gas out of it. I think my only real loss of power is coming more from a lack of fuel then anything else, I don't think the 425 carb and model J converter I selected supply enough air or fuel.