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Propane engine builds (tech, questions, advice)
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<blockquote data-quote="halcat" data-source="post: 257530" data-attributes="member: 2295"><p>For a while I ran a 427 big block chevy. L72 ,11 1/2 to 1 pistons, 600 lift solid cam, rect. Port heads, made about 520 hp on gas with a 850 carb. Took it out of my 69 camero because of to much compression for pump gas . Installed it in my jeep and put it in pane because of it's higher octane rating. Ran pretty good but did not have the power it had on gas. Called comp cams and told the tech dept what I was doing and they ground me a cam that would build more cylinder pressure. My old cam had so much overlap that more propane was going out the header pipes unburned than was being burned. This cam gave me at least 50 hp. Than I put two mixers with two throttle bodies on a duel plane single four barrel intake, hooked upon progressive linkage. Ran on one to 1/3 throttle and than kicked ass when opened up. Got all my hp back and gat a lot better milage to boot. Propane goes inas a gas and displaces a lot of oxygen. Needs a defferent cam to build better pressure, but with this pressure is more heat which is harder on valves and seats. Won't hurt rock crawlers but would hurt school busses and such. That's about all I know!</p></blockquote><p></p>
[QUOTE="halcat, post: 257530, member: 2295"] For a while I ran a 427 big block chevy. L72 ,11 1/2 to 1 pistons, 600 lift solid cam, rect. Port heads, made about 520 hp on gas with a 850 carb. Took it out of my 69 camero because of to much compression for pump gas . Installed it in my jeep and put it in pane because of it's higher octane rating. Ran pretty good but did not have the power it had on gas. Called comp cams and told the tech dept what I was doing and they ground me a cam that would build more cylinder pressure. My old cam had so much overlap that more propane was going out the header pipes unburned than was being burned. This cam gave me at least 50 hp. Than I put two mixers with two throttle bodies on a duel plane single four barrel intake, hooked upon progressive linkage. Ran on one to 1/3 throttle and than kicked ass when opened up. Got all my hp back and gat a lot better milage to boot. Propane goes inas a gas and displaces a lot of oxygen. Needs a defferent cam to build better pressure, but with this pressure is more heat which is harder on valves and seats. Won't hurt rock crawlers but would hurt school busses and such. That's about all I know! [/QUOTE]
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