Generator comparison question

MEXICOWANDERER wrote:
Wanna know HOW HOT things get? With a dead stock engine, towing the cast iron exhaust manifolds glowed BRIGHT RED; enough to burn rubber a foot and a half distant.

Glowing exhaust manifolds doesn't prove anything. Load a lean gasoline engine pulling Grapevine on a 100 degree day and you'll experience similar results. Sorry... but the ONLY meaningful EGT readings are with calibrated K-probes mounted at the exhaust ports. LPG Stoichiometric is 15.5, on gasoline it's closer to 14.7. Ignition timing is critical, meaning that the static, dynamic and total advance curves are completely different between the fuels. Get it wrong and you risk losing an engine... with ANY fuel.

Among a few other LPG rigs I own, I have a pet Honda GX240 coupled to a Leece Neville 24V/140A alternator. It was built specifically to charge a rack of FLA batteries, but doubles nicely as a backwoods welder. When first built, I ran it for about 100 hours on gasoline before converting it to strictly propane. In preparation for LPG conversion the head was shaved .050" and a GX270 stamped steel head gasket installed. This combo netted approx. 11 to 1 CR. Next, I installed the vastly improved, 2nd gen ignition coil, altered the advanced curve, then screwed-in Iridium BPR7EiX spark plug. Prior to the mods on 87 pump regular at 50% load, EGT hovered consistently around 1080-1105f. After the mods, on propane and pulling the exact same load, the EGT dropped 55-65f degrees. All measurements were taken with a permanently installed k-probe (piped into the exhaust port) and fed to a Fluke 179.

MEXICOWANDERER wrote:
LPG powered engines leak lube oil a lot more than gasoline powered engine. Work around them enough and you also learn this point.

Nonsense.

In well over 40 years of wrenching, I never experienced such. So what was your 'experienced' assessment of the root cause?

My hands-on LPG began in 1973 at Arnold Machinery in SLC, Utah under the guidance of a veteran Impco training instructor. My forte from that day forward with AM, was LPG installs on industrial equipment... primarily Hyster & Clark forklifts. With the 70's oil embargo, LPG business was brisk, so I started my own business doing nothing but gaseous installs on any and all privately owned vehicles. Some years later I landed in French Camp, California with training emphasis on Honda portable generators.

Not in person, but I too have had a few lengthy discussions with Mr. Miller - specifically regarding his turbo/LPG Pinto. Informative gent.

That said, I guess we'll just politely disagree.