Alky carb ??????????????????
#1073296
09/11/11 07:40 PM
09/11/11 07:40 PM
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Joined: Jan 2003
Posts: 1,235 TN
65racer
OP
2009 IHRA World Champion
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OP
2009 IHRA World Champion
Joined: Jan 2003
Posts: 1,235
TN
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Need a little advice from the carb experts, I changed over this weekend to alky, in my car for some testing purposes, mostly everything went as planned, with the exception of 1 problem that croped up, the car will not do a decent burnout, it pops, and bangs in the box, like it is on a two step, the car leaves the line as it should, but the water box problem has me perplexed, I did not take my gas stuff with me to change back if there was a problem, so I didn't get to see if it was something about the car or the carb, I borrowed the carb from a friend that ran it on his car, until it lost the engine a while back, I replaced the pump gaskets. and cleaned it good, it cranks and idles great, revs great, but I figured the carb was lean on the front 2 barrels, being the reason it was popping in the water box, but turning the air screws out made no difference with the problem, so if someone has any suggestions I am all ears, the car ran fine last weekend on gas, so I don't really suspect that there is something wrong with the car, and to finish up, the car didn't run a bit faster on alky than it did on gas, can lay time slips side by side and there is no difference in the et's and mph's go figure, I have always heard that if you were set up right on gas going to alky there would be very little gain, but the car does run a bit cooler.
Thanks Dave
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Re: Alky carb ??????????????????
[Re: 65racer]
#1073298
09/11/11 08:07 PM
09/11/11 08:07 PM
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Joined: Nov 2003
Posts: 6,293 Rock Springs
Bob_Coomer
master
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master
Joined: Nov 2003
Posts: 6,293
Rock Springs
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Whats the throttle position when performing your burn out? Some of those carbs arent the cleanest running at part throttle. What I did when I was running injection was add a extra 3 step, limiter. Its easy to over rev a dragster in the box, killing valve springs. I had a 5500 or 6K chip in that side, flip the switch and lay it on the wood. Also what kind of fuel filer are you running... It needs to be a stainless mesh type filter for sure.... Dont go crazy with plug gap too.... Alky motors dont like wide plug gaps...... about .035-.038 is max.. Hope this helps ya..
[color:"red"]65 Hemi Belvedere coming soon [/color] [color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]
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Re: Alky carb ??????????????????
[Re: 65racer]
#1073300
09/11/11 08:42 PM
09/11/11 08:42 PM
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Joined: Nov 2009
Posts: 2,177 ill
dennismopar73
top fuel
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top fuel
Joined: Nov 2009
Posts: 2,177
ill
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heres what i learned and picked up from guys ,, if the fuel system is close on gas , the switch to alk, is at best 10-2 tenth mostly for cooling advantage, and some hp gains,, i have seen 3-4 tenths pick up, idono carb to carb change you did, no info there given? i know the guys are told to look at mph, and heat gain in the 1/4 -1/8 mile, if it gets colder down track, its lean,, if it gets warmer by 20 deg its to 'fat' , sometimes diffrent heat rang of plugs are also needed to maximize the effect and burn of alk, timming may also come into play, useually couple * less timming ? it is alittle diffrent game getting the carb set and fine tunning, oo 7 # most likley not enough
Last edited by dennismopar73; 09/11/11 08:43 PM.
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Re: Alky carb ??????????????????
[Re: mistress]
#1073302
09/11/11 10:45 PM
09/11/11 10:45 PM
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Joined: Jun 2004
Posts: 6,780 Alabama
Mopar-Al
master
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master
Joined: Jun 2004
Posts: 6,780
Alabama
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Quote:
[i know the guys are told to look at mph, and heat gain in the 1/4 -1/8 mile, if it gets colder down track, its lean,, if it gets warmer by 20 deg its to 'fat'
You got it backwards. too fat and temp will drop down track, too lean will get hotter.
I am having to jet up now myself. I was running 165/170 and could never get it hotter with the 440/ 1050 dominator. I stuck a 520 cube under the same system and now it stays at 200. I figure I am really lean, which makes it run hotter. Plug gap is .026 and timing at 36*
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