Originally Posted by the_experience03
It pains me to recommend this site to you, but...
I can see why. Geez. I also ended up on http://binderbulletin.org
, which was almost as bad, but I did find the information I needed.
Seems that IH 304 and 345 engines of the era were built to run either propane or gas, so they already have a moderately high compression, by design, and all you're *supposed* to have to do is tweak the timing. One fellow reported not even having to do *that* much. They came with hardened valve seats from the factory.
The group wisdom seems to be:
1. Make sure your ignition system is top-notch. Better spark = good results.
2. Be prepared to adjust the timing and/or idle settings and/or mixture. All easy adjustments.
3. Accept a *slightly* lower performance curve--which I found highly relevant in a Scout, but less so, I would think, in a 6.5 ton bus.
4. Have fun with a vehicle (the Scout/Scout II) that will run at any angle, even upside down. I'd like to see a video of that, personally.
Between that, and your device specs, I'm a happy boy. I'm looking for the Impco E regulator, 425 mixer, a VFF30 lockoff, to shut the gas off when the engine stalls out, and some sort of solenoid switch to shut off the gasoline flow and switch over to propane. Plus tank, hoses and such, right? (http://www.propaneguy.com
, sure enough, has a kit for all this, for $450 Canadian, less the tank and service line. Probably, similar gear can be had elsewhere, possibly cheaper. I did find the Impco parts on eBay.)
Thanks a bunch for all the help; I think propane is the way to go, though I'm a fair ways from getting to that conversion....thinking ahead, so I can plan for tank space under the body!