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Tech & Fab
need help with cam selection for Propane
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<blockquote data-quote="altfuel1991" data-source="post: 570475" data-attributes="member: 1211"><p>A few years ago I supplied a dual mixer setup to an engine builder in Atlanta that was putting together a 383 stroker for use in a competition buggy in the XTERRA series. He had a cam ground specifically for that combination. It had a strong idle, not loping, and had a torque curve of over 500lb.ft of torque from 1800 rpm through 6500rpm. He would not give out the specs on the cam. My suggestion is to contact a cam grinder and tell them what you are going to run and let them make the proper suggestion. Horsepower on comes into play at high rpm, torque is what gets you there. You can run a higher lift but you do not want a lot of duration. The cam needs to keep the vacuum signal high. The cam grinder needs to know all the critical info on the engine. And as was poster earlier, a single mixer will not feed a small block above 5000 rpm properly. It is like running a two barrel carb, simply can't flow enough air and fuel.</p></blockquote><p></p>
[QUOTE="altfuel1991, post: 570475, member: 1211"] A few years ago I supplied a dual mixer setup to an engine builder in Atlanta that was putting together a 383 stroker for use in a competition buggy in the XTERRA series. He had a cam ground specifically for that combination. It had a strong idle, not loping, and had a torque curve of over 500lb.ft of torque from 1800 rpm through 6500rpm. He would not give out the specs on the cam. My suggestion is to contact a cam grinder and tell them what you are going to run and let them make the proper suggestion. Horsepower on comes into play at high rpm, torque is what gets you there. You can run a higher lift but you do not want a lot of duration. The cam needs to keep the vacuum signal high. The cam grinder needs to know all the critical info on the engine. And as was poster earlier, a single mixer will not feed a small block above 5000 rpm properly. It is like running a two barrel carb, simply can't flow enough air and fuel. [/QUOTE]
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need help with cam selection for Propane
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