Visit The Dirt Forum for More Information

Author Topic:   gas to alcohol
dan ferry
Dirt Maniac

Total posts: 183
posted March 15, 2005 08:29 PM  
Yes i know id be better off buying an alcohol carb ready to go, but a local guy who builds alot if street stock and hobby stock carbs said if i could get the info on what needs changed and a ball park starting point he'll get the parts and build me one as a sponsor. any help greatly appreciated 406CU in 13.5:1 compression roller cam track1 heads hv1000 intake about 7500 max rpm. this will be a 750 with the proform center section with air bleed jets and all jet size,pump cams, shooter size and float type needed for starting point , thanks

zeroracing
Dirt Forum Champ
Total posts: 1875
posted March 16, 2005 06:38 AM  
keep with gas and save your weights.

Ego Racing
Dirt Forum Champ
Total posts: 724
posted March 16, 2005 06:55 AM  
I KEEP RUNNING GAS! We just spent ALOT of money switching our Late Models to gas. The car dosen't loose weight as fast and the handling will be more consistant. Also if you want to run anything over 50 laps you will be close to running out with the caution laps involved.
Also if your motor was built for gas the cam in it will not get the most power from alcohol.
The maint involved in running alcohol is ALOT more than gas. You will need to pull the fuel system apart about every week and clean it to keep corrosion down and everything working. If not things go bad in a hurry.

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted March 16, 2005 07:47 AM  
If your guy hasnt built or had experience building an alcohol carb then I really think youd be better off buying a used one even. You can find a decent used one for 3-400$. You dont want to burn down a good engine with a carb that isnt built right for the application.

The alky is more corrosive but we ran it for years without any problems and rally only cleaned it up good once a year or so. Run a good top lube and that helps a bunch. But keep in mind you will burn almost twice as much alky as gas.

FlyNLoIMCA17
Dirt Forum Champ
Total posts: 753
posted March 16, 2005 04:26 PM  
I agree I would keep the gas! I switched to alky a few years ago. I ran about 3 races and decided to go back to gas. Less fuel burn off, less corrosive. Basically better all around for me. But hey if you just have to run alky. I still have my alky setup. I'll sell it pretty cheap!!

dan ferry
Dirt Maniac

Total posts: 183
posted March 16, 2005 07:48 PM  
thanks all i agree with the loosing of weight ive been wanting to run gas but a couple people say alcohol makes alot more hp and alot of mods at our track that run alky because cant seem to run cool enough on gas, im brand new at the mod from street stock and i can keep it cool while alot of those were blowin their tops so im gonna try it, the only problem is the way the car is cut you can only fit i think it measured 24 or 25" wide rad i have a 22" rad and its only one wide row maybe ill try it if it dont work ill get a bigger one

zeroracing
Dirt Forum Champ
Total posts: 1875
posted March 16, 2005 08:51 PM  
i run gas, use a cheap aluminum water pump, a tru cool speedway special radiator, and the key is 1:1 pulleys and never overheat. the reduction pulleys cause the motor to overheat, but the 1:1 made it run cool, many nights the rad is taped about 30% off.

James Birmingham
Dirt Full Roller

Total posts: 28
posted March 17, 2005 08:41 AM  
Hey have your guy email me and I can help with some of the mods to the circuts in the carb. But you have to also change the supply system up. It takes double the amout of Methonal most fuel systems on gas are marginal.

Its not just the HP gain that makes Methonal so neat. Even over rich it still produces almost the same amount of HP as when its at the ideal A/F ratio thats why the cooling effect works so well. On gas if its off a little power is down alot or the motor burns up. I always looked at it that you can chase the chassis and not worry about the HP. Plus lets face it if your getting out HPrd you can always put some POP in.

James Birmingham
Dirt Full Roller

Total posts: 28
posted March 17, 2005 08:44 AM  
Oh yeah its nice to install an oil heater in the pan works great to make sure the oil stays dry.

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted March 17, 2005 09:04 AM  
I woudlnt reccomend running rich on alky just to be safe or to help cool the engine. It will wash the cylinders down and you will greatly increase wear on the internals by having the fuel in the oil.

James Birmingham
Dirt Full Roller

Total posts: 28
posted March 19, 2005 07:46 AM  
agreed but theres rich and then theres RICH, That rich on any fuel will wash the cylinders down.

rrrrick
Dirt Maniac

Total posts: 192
posted March 21, 2005 11:33 AM  
You can run gas and not overheat, Mark Allison runs gas at tracks all over the southwest temps in the 100's and I have never seen him overheat.
I personaly like Alky, simple fan shroud and a thermostat keeps me at 190 all night


Back to the Archives