Anyone out there running on propane? - Page 2 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Chevyman69 · 03-29-2002, 11:34 PM

Valve rotators is a thing for helping prevent carbon build up and heat distribution. Propane runs a lot hotter than gas and that valve gets extremely hot. What happens when it spins, it is so hot that the valve actually starts to chews into the vale seat until the seat is gone. Personal experience off my my friends propane powered 84, the seats were all chewed out of the heads on the exhaust valves. A true propane motor should have better valves and higher comppression to allow the full potential of the fuel. Like I said one or the other, or do it right or don't do it all.

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69 CST 10, 402, steel crank, heavy rods, Federal Mogul Forged Pistons, 9.9:1 compression, polished ported 781 heads 2.19/1.88 manley stainless valves, Crane Powermax Hydraulic roller 288/296 and .587,.610 lift, hardened pushrods, Crane Roller Rockers, Weiand Action Plus, 750CFM Rochester QJET, MSD HEI, MSD 8MM Wires, Dynomax Ceramic coated headers, should be about 500 H.P. 700R4 2500 stall, pretty nasty shift kit, 373 Auburn Pro Series Posi, buckets/console air/tilt/tach 4wheel discs

Daily Driver: 92 Chev Reg Cab LWB Silverado 4x4, loaded, 350 Accel filter/cap/rotor/coil/AC Delco wires/AC Delco RapidFire plugs, Edelbrock intake and headers, 180 degree thermostat, Hypertech Thermomaster Chip, true duals 700R4 with B@M Shift Kit for now!

Canada20 · 03-30-2002, 12:56 AM

Chevyman: I hadn't thought the turning valve would dig in like that; no kidding it gets awfully hot. Another thing that I've heard is that one of the weak points on the 292 are the valves burning (on gas engines) which is why they used the rotators. I have no idea if that's true.

I assume your buddy's '84 was a 292 as well (not that it makes any difference anyway :-> )

You guys are still making good points everytime I check in here....great stuff. I didn't think this topic would go this far.

I'm going to look into this fairly seriously but may not really be able to afford everything right away anyway so I'm going to do some searching for info about it.

Greg

03-29-2002, 11:34 PM	#26
Chevyman69 Vortec 350's Suck Join Date: Nov 2000 Location: Pickardville Alberta Canada Posts: 544	Valve rotators is a thing for helping prevent carbon build up and heat distribution. Propane runs a lot hotter than gas and that valve gets extremely hot. What happens when it spins, it is so hot that the valve actually starts to chews into the vale seat until the seat is gone. Personal experience off my my friends propane powered 84, the seats were all chewed out of the heads on the exhaust valves. A true propane motor should have better valves and higher comppression to allow the full potential of the fuel. Like I said one or the other, or do it right or don't do it all. ------------------ 69 CST 10, 402, steel crank, heavy rods, Federal Mogul Forged Pistons, 9.9:1 compression, polished ported 781 heads 2.19/1.88 manley stainless valves, Crane Powermax Hydraulic roller 288/296 and .587,.610 lift, hardened pushrods, Crane Roller Rockers, Weiand Action Plus, 750CFM Rochester QJET, MSD HEI, MSD 8MM Wires, Dynomax Ceramic coated headers, should be about 500 H.P. 700R4 2500 stall, pretty nasty shift kit, 373 Auburn Pro Series Posi, buckets/console air/tilt/tach 4wheel discs Daily Driver: 92 Chev Reg Cab LWB Silverado 4x4, loaded, 350 Accel filter/cap/rotor/coil/AC Delco wires/AC Delco RapidFire plugs, Edelbrock intake and headers, 180 degree thermostat, Hypertech Thermomaster Chip, true duals 700R4 with B@M Shift Kit for now! __________________ 69 Chev CST 10 reg cab lwb Daily Driver: 92 Chev Reg Cab LWB Silverado 4x4, K.I.A 7:51 AM 04/22/03 Will be resurrected

03-30-2002, 12:56 AM	#27
Canada20 Registered User Join Date: Jun 2001 Location: Calgary, Alberta, Canada Posts: 802	Chevyman: I hadn't thought the turning valve would dig in like that; no kidding it gets awfully hot. Another thing that I've heard is that one of the weak points on the 292 are the valves burning (on gas engines) which is why they used the rotators. I have no idea if that's true. I assume your buddy's '84 was a 292 as well (not that it makes any difference anyway :-> ) You guys are still making good points everytime I check in here....great stuff. I didn't think this topic would go this far. I'm going to look into this fairly seriously but may not really be able to afford everything right away anyway so I'm going to do some searching for info about it. Greg __________________ No such thing as a stupid question, right?



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