Another desktop dyno question for propane
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Senior User
Joined: Feb 2006
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From: Texas
Another desktop dyno question for propane
Ok, can anyone tell me what this thing might be making for HP and torque? This is a running engine, most of the info is based on what previous owner told me, compression check showed most cylinders were 180 to 200.
390 engine, 12:1 trw forged pistons, Performer RPM 390 intake, headers, dual exhaust (not sure of diameter, but tail pipe does not look huge), "turbo" type mufflers, exhaust all the way to the rear, Mallory dual point distributor, big high voltage coil, an "RV" type cam (don't know the specs or brand, but may be a little better for low to midrange torque than a stock cam), heads are D2TEE-A (standar truck heads from '70s). Block is from '60s and shows a 66 date code, as far as I know heads are not ported...I'm not sure on bore size, may be .030 over. It runs only on propane. (might want to sell or trade, as this truck project is too much for me right now...). thanks, CJ
390 engine, 12:1 trw forged pistons, Performer RPM 390 intake, headers, dual exhaust (not sure of diameter, but tail pipe does not look huge), "turbo" type mufflers, exhaust all the way to the rear, Mallory dual point distributor, big high voltage coil, an "RV" type cam (don't know the specs or brand, but may be a little better for low to midrange torque than a stock cam), heads are D2TEE-A (standar truck heads from '70s). Block is from '60s and shows a 66 date code, as far as I know heads are not ported...I'm not sure on bore size, may be .030 over. It runs only on propane. (might want to sell or trade, as this truck project is too much for me right now...). thanks, CJ
Logistics Pro
Joined: Jun 2004
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From: South Central Utah
At peak HP RPM propane produces close to 10% less hp than gasoline. Off idle of just pulling away from a light propane hp could be down as much as 30%+ less than gas. Ideal comp ratio for propane is 10.5:1. Soprry I don't have the answer but maybe this will help if someone can figure hp on gasoline.
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Joined: Jul 2003
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From: iowa
Its hard run a sim without all the info,
based on 396, 12:1cr, 600cfm carb, rpm intake, headers and mufflers, d2te heads, I used the stock camshaft specs, and propane.
348hp at 4500 and 443tq at 3500
My personal opinion, is that the compression is lower than 12:1 but that impossible to tell without the related info.
based on 396, 12:1cr, 600cfm carb, rpm intake, headers and mufflers, d2te heads, I used the stock camshaft specs, and propane.
348hp at 4500 and 443tq at 3500
My personal opinion, is that the compression is lower than 12:1 but that impossible to tell without the related info.
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