http://www.utterpower.com/pmg-frame-building-secrets/ Alternative Energy Solutions Thu, 09 Feb 2012 04:49:52 +0000 hourly 1 http://wordpress.org/?v= http://www.utterpower.com/pmg-frame-building-secrets/comment-page-1/#comment-1569 George B. Sun, 16 Jan 2011 16:56:02 +0000 http://www.utterpower.com/?p=951#comment-1569 You are right, 1900 might be ok, you are making less heat at that speed, maybe you use a non contact thermometer to check cooling fins and exhaust temp and full load? The Onan flathead gas twins were designed to run up to 3600 RPMs I believe, they were used at 1800 for a lot of Onan RV 4000 watt 120VAC generators, wonder what the mods were if any? I have found a few of these where the previous owner had cranked them up to 240 AC output, 3600 RPM 120hz, I assumed they were using it to run a welder or similiar, but who knows? You are right, 1900 might be ok, you are making less heat at that speed, maybe you use a non contact thermometer to check cooling fins and exhaust temp and full load? The Onan flathead gas twins were designed to run up to 3600 RPMs I believe, they were used at 1800 for a lot of Onan RV 4000 watt 120VAC generators, wonder what the mods were if any? I have found a few of these where the previous owner had cranked them up to 240 AC output, 3600 RPM 120hz, I assumed they were using it to run a welder or similiar, but who knows?

]]> http://www.utterpower.com/pmg-frame-building-secrets/comment-page-1/#comment-1563 Joseph Bolton Sun, 16 Jan 2011 10:04:15 +0000 http://www.utterpower.com/?p=951#comment-1563 I like the link for the small air cooled 10hp diesel engine! One thing I wish the Lister 6/1 could be is air cooled. Just out of curiosity, I looked up typical Hp, BMEP, and torque profiles on diesel engines and made a spreadsheet that calculates Hp at rpm. This 10hp engine, if it follows 95% of diesel engine power profiles, will still make 6hp at 1900 rpm's since BMEP increases to a point as rpm's decrease. With a heavy enough pulley or different flywheel, this could be a reliable little machine if engine life increases significantly at these lower rpm's, all things being equal. The engine might not cool as well as it does at full rpm, but it might cool just fine too since a lot of heat comes from friction at 3600 rpm's. Either way, it is a cute engine. If I could make a new flywheel for it and run it well at 1900 rpm, I'd try using it as a backup for the Lister 6/1 any day. I like the link for the small air cooled 10hp diesel engine! One thing I wish the Lister 6/1 could be is air cooled. Just out of curiosity, I looked up typical Hp, BMEP, and torque profiles on diesel engines and made a spreadsheet that calculates Hp at rpm. This 10hp engine, if it follows 95% of diesel engine power profiles, will still make 6hp at 1900 rpm’s since BMEP increases to a point as rpm’s decrease. With a heavy enough pulley or different flywheel, this could be a reliable little machine if engine life increases significantly at these lower rpm’s, all things being equal. The engine might not cool as well as it does at full rpm, but it might cool just fine too since a lot of heat comes from friction at 3600 rpm’s. Either way, it is a cute engine. If I could make a new flywheel for it and run it well at 1900 rpm, I’d try using it as a backup for the Lister 6/1 any day.

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