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Old 10-20-2012, 09:39 PM
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Want to build an SBC on alcohol

Hey guys, I'm new to the forum and hopefully I can get some help here. I'm wanting to build an 355ci or 383ci (not sure which would be better for my goals) on alcohol for a mud truck. I'm looking for something that can handle 8000 rpm and is in the neighborhood of 750hp on methanol and NA. Please help guys. I'm going off of VERY little knowledge of sprint car motors that these numbers are possible. Let me know. But I'm drawing the line at $15,000 on this thing. Lets here the ideas, everything from rotating assy, to heads, cam and grind profiles, and fuel delivery (carb vs hilborn)

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Old 10-20-2012, 10:23 PM
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The only way you are going to do this for that money is with a 871 supercharged 454 --496 BBC
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Old 10-20-2012, 11:14 PM
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What are you wanting to use for induction?to make 750 horse power on ethanol you need to use very high compression,or forced induction.Not sure 15k is enough money,,,figure on 4k just for the injection
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Old 10-21-2012, 08:11 AM
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I was thinking naturally aspirated with hilborn injection and 15:1 compression, but kinda starting to think that's a pipe dream...
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Old 10-21-2012, 08:15 AM
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I know for 12k I can hit 1,000hp with a 468 and an 8-71 on pump gas but I thought alcohol was much more volitle...
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Old 10-21-2012, 08:16 AM
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Find a couple reputable engine builders in your area that only build high performance engines and ask them this same question most of them would be more than happy to help you in hopes of recieving your business. And good luck sounds like a cool project
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Old 10-21-2012, 08:22 AM
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Btw my buddy just had a 434 built for spray done ot cost him 25k and it out down 740the on race fuel
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Old 10-21-2012, 10:25 AM
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the cheapest way to make 1,000 reliable horse power would be a boosted 540/555.A normally aspirate 598 would cost 17k on pump gas
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Old 10-21-2012, 10:57 AM
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Quote:
Originally Posted by nskyline34 View Post
I know for 12k I can hit 1,000hp with a 468 and an 8-71 on pump gas but I thought alcohol was much more volitle...
Methanol will work very well as a fuel for the same engine combo.
Whats the problem?
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Old 10-21-2012, 01:53 PM
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Quote:
Originally Posted by F-BIRD'88 View Post
Methanol will work very well as a fuel for the same engine combo.
Whats the problem?
Oh ok, I just thought I could do it NA. What compression should I run? This motor is at 8.5:1 right now... If I were to do a carbon copy on alcohol should it be more like 10:1 or should I just turn more boost more more power? Right now it's breathing though dual 750 double pumped, what should that be for alcohol? Also what do I need to do to turn more RPM with it? Is 7500 rpm possible with a 468 and an 8-71 on alcohol? The internals are all forged, but should I use aluminum rods? What cylinder heads can handle this?
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Old 10-21-2012, 01:56 PM
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I've built plenty of engines myself, I'm not about to start taking them to people to build for me. This is why I'm asking, I don't know what heads and ect to run to handle the power and 7500 rpm with an 8-71 and a BBC. Let's forget the money and just talk parts... If it cost more so be it, just want a 7500 rpm 468 BBC with a blower and alcohol and NO LESS THAN 1,000hp
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Old 10-21-2012, 02:20 PM
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468 would need heads flowing 375 cfm with 80% exhaust flow ratio. The solid roller needs 640 lift and duration about 255@50 with a lobe separation at 114 ish.8 or 9 plus pounds boost,2x 1050 cfm holley HPs,2 1/8 headers,etc,standard parts
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Old 10-21-2012, 03:14 PM
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What about injection? Is that better than carb with alcohol? What kit/company is good with alky injection on blown applications? Also why comp ratio will this need?
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Old 10-21-2012, 03:26 PM
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original post was to make 800 hp with a small mouse?
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Old 10-21-2012, 03:56 PM
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The original intent was 700-750 with an SBC with hilborn injection on alky. I want it to spin 7500-8000 rpm. It's basically a sprint car motor. I just have no clue about heads or valves or anything. Can u help with that? Basically if the 700's aren't possible then I want as much as I can squeeze out of it. What do you think are realistic numbers and parts?
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