Slant Six Forum :: is this 800 cfm carb ?

Wikipedia :As an engine fuel

Nitromethane is used as a fuel in motor racing, particularly drag racing, as well as for rockets and radio-controlled models (such as cars, planes and helicopters) and is commonly referred to in this context as "nitro." The oxygen content of nitromethane enables it to burn with much less atmospheric oxygen.
4CH3NO2 + 3O2 → 4CO2 + 6H2O + 2N2
The amount of air required to burn 1 lb (0.45 kg) of gasoline is 14.7 pounds (6.7 kg), but only 1.7 lb (0.77 kg) of air is required for 1 lb of nitromethane. Since an engine's cylinder can only contain a limited amount of air on each stroke, 8.7 times more nitromethane than gasoline can be burned in one stroke. Nitromethane, however, has a lower energy density: Gasoline provides about 42â€“44 MJ/kg whereas nitromethane provides only 11.3 MJ/kg. This analysis indicates that nitromethane generates about 2.3 times the power of gasoline when combined with a given amount of oxygen

Author:	Rick Covalt [ Fri Apr 12, 2013 1:42 pm ]
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Quote: a member who ran Nitromethane in his street Aspen. He no longer posts...... How big was the fire anyway??

Author:	slantzilla [ Fri Apr 12, 2013 3:17 pm ]
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That was Putzie. He was running very small loads. He killed 6 pistons, but no fire.

Author:	sandy in BC [ Fri Apr 12, 2013 3:26 pm ]
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That was Putzie. He was running very small loads. He killed 6 pistons, but no fire.

Author:	USAJon [ Fri Apr 12, 2013 3:41 pm ]
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This morn I called and talked to neil newman the man himself..hes 85 now.2 much 2 post using marys cell. Will post sarurday night.unbelievble info.

Author:	ceej [ Fri Apr 12, 2013 5:03 pm ]
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What is it Bob has painted on the trunk of his inliner coupe? "The older I get, the faster I went!" CJ

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is this 800 cfm carb ? https://slantsix.org/forum/viewtopic.php?t=51669	Page 3 of 4

Author:	805moparkid [ Fri Apr 12, 2013 5:44 pm ]
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well i dont run an AFB but my vac secondary 750 holley was an upgrade from the 600 mech secondary. seat of the pants and the vacuum gauge tell me it likes the 750 but when i get to go out and run out of tuning to do i'll throw the 600 back on and compare... as a bar i got 20mpg with the 600 mech from phx to Las Vegas with 3.91's @ 3000rpm and a loaded down car...

Author:	DusterIdiot [ Fri Apr 12, 2013 5:48 pm ]
Post subject:	Lol...
Quote: Wikipedia :As an engine fuel Nitromethane is used as a fuel in motor racing, particularly drag racing, as well as for rockets and radio-controlled models (such as cars, planes and helicopters) and is commonly referred to in this context as "nitro." The oxygen content of nitromethane enables it to burn with much less atmospheric oxygen. 4CH3NO2 + 3O2 → 4CO2 + 6H2O + 2N2 The amount of air required to burn 1 lb (0.45 kg) of gasoline is 14.7 pounds (6.7 kg), but only 1.7 lb (0.77 kg) of air is required for 1 lb of nitromethane. Since an engine's cylinder can only contain a limited amount of air on each stroke, 8.7 times more nitromethane than gasoline can be burned in one stroke. Nitromethane, however, has a lower energy density: Gasoline provides about 42â€“44 MJ/kg whereas nitromethane provides only 11.3 MJ/kg. This analysis indicates that nitromethane generates about 2.3 times the power of gasoline when combined with a given amount of oxygen As much as Wikipedia is a nice source of general information, I find it disconcerting that in the "Engine Fuel" section you quoted it failed to impart a particularly important study in 1985 by Bush, Germane and Hess (experiments conducted at BYU) that tested the fuel with various compression engines and where the peak ignition had to occur for best use of the fuel with the least amount of knock. Also they had noted that various antiknock additives had no effect or worsened knock (it was found that methanol injection increased knock up to 50%) when used with the fuel. Another batch of experiments was done by Bob Norwood and C.J.Batten that noted that multispark (and up to 3 spark plugs) in the chamber increased the efficiency of the burn compared to a single spark plug chamber. FYI. -D.Idiot

Author:	slantzilla [ Fri Apr 12, 2013 7:14 pm ]
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On Top Fuel cars about half the nitro run through them is simply to cool the chambers to keep the motor from melting itself. Also, nitro motors need to be loaded down to get the fuel to burn. That is why you see so many go "BOOM!" after they spin the tires. The mags and plugs will throw about a 3 foot long flame. It is needed to keep nitro lit. If a plug goes out with that fuel volume really bad things happen.

Author:	USAJon [ Fri Apr 12, 2013 8:10 pm ]
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We hydro a harley rod..as we lost fire..

Author:	ceej [ Fri Apr 12, 2013 9:48 pm ]
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And we're having way to much fun with you. Take a deep breath. Your one of us. Just don't put a snoot full of nitro to your motor. It won't live to tell the tale. These engines can handle quite a bit. Think seriously about aluminum rods and a good crank girdle before you put the boots to it. And seriously consider what it's going to take to keep the head from warping under the load. If you put a load of Nitro in there, the head will bend between the head bolts/studs. Your going to want to O-ring. On top of that, you'll be changing oil between passes if you are even remotely rich. Even with the jets removed, it'll probably go lean and turn your pistons into some form of pan liner. I'm hoping you were joking around! The primary circuit of the AFB really isn't conducive to fuel loads you can't tune. With the metering rods hanging through the jet threads, you don't have a lot of adjustability. I'm not sure you can tune a carb that big to run on methanol on such a small engine. The enrichment circuits will have to be really big. Once you have that under control, you can play with nitro percentages. A good rule of thumb is to increase the jet area based on the percentage run. For instance, off base methanol, if you run 30%, it's going to be in the neighborhood of 1.3x area increase. That's a generalization. And it's not linear. What's going to bite you in the butt is the vacuum secondary. The AFB is a flow based carb in the secondary. Primary metering is vacuum based, and you won't have a lot of that. To nail a nitro build, an alcohol Holley based carb will be a lot easier to deal with. You won't be playing tag with metering rod diameters, springs and tapers. Get a fresh magneto or something seriously strong so you have lots of fire. There's no place for a second plug in the head. CJ

Author:	slantzilla [ Fri Apr 12, 2013 11:01 pm ]
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A certain team did run a 30% load with methanol. It ran very well. Can't honestly comment on engine damage. Right now, unless you are a licensed fuel team possession of nitro makes you a terrorist in the eyes of Homeland Security. How the hell did we get from an 800 not being viable on a Slant to nitro anyway?

Author:	ceej [ Fri Apr 12, 2013 11:26 pm ]
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It's a boatload of hose or Nitro to make a car go on such a big carb. Doc was running a 750 Edelbrock on the Toad. If he didn't get on the hose at the hit, it fell on it's face. Since then, He tuned it a bit. I think he has an appropriate carb now. Not sure though. Throw enough down it's throat on the fogger, it can run on anything as long as the base mixture is right. CJ

Author:	DusterIdiot [ Sat Apr 13, 2013 7:49 am ]
Post subject:	Lol...
Quote: How the hell did we get from an 800 not being viable on a Slant to nitro anyway? If the carb wasn't going to fit at 14.7:1 stoich, we just adjust the fuel to fit the proper delivery (especially at 2-3:1 stoich on this one). It's all fixed and everything is good. Quote: Right now, unless you are a licensed fuel team possession of nitro makes you a terrorist in the eyes of Homeland Security. Yeah, Oklahoma didn't help racers or farmers needing fertilizer at all. Just takes one idiot to ruin things for the rest of us... -D.Idiot

Author:	sandy in BC [ Sat Apr 13, 2013 9:02 am ]
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I may be an idiot.....but I mean well. I slur my words ...so Homeland security always thinks I said terrist instead of toorist. I want to run 2 500 cfm afb s on a tunnel ram.....does that mean I have to run Hydrazine? What if I run acetylene through the fuel side of a fogger nozzle and straight oxygen through the NO2 side? Will it pass Smog?

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Author:	DusterIdiot [ Sat Apr 13, 2013 9:20 am ]
Post subject:	Uh huh...
Quote: I want to run 2 500 cfm afb s on a tunnel ram.....does that mean I have to run Hydrazine? Only if injecting Nitro to boost the power levels in the engine, it is similar if done this way to injecting nitroglycerin as an octane booster. Quote: I said terrist instead of toorist Sandy, they must've thought it was the French accent and put you on the watch list. Instead of swigging red ale in front of them, keep a can of Budwhizzer handy then they'll think you are a patriot with a cold.