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Old 05-09-2005, 11:50 AM
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Barry grant carb air/fuel question

I was trying to tune my car, It's a 468 CI with a 750 mighty demon.

the driver side spark plug are brown-chocolate, thats mean, this is the correct air/fuel ratio, but (this is my problem), the passenger side spark plug are really black, i think this mean I have too much fuel on this side and i need to ajust them.

My question Do I have to turn the adjustement screw clockwise or counterwise to give more air??

I loose the Barry grant CD, and I really dont know in what side to turn those 2 screw....

Last question, what is the used or the screw in the middle of this carburetor???? How am i supposed to adjust the carb with this screw..what is the effect on my motor if I turn this screw..

Thanks in advance...

Stephane

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Old 05-09-2005, 01:13 PM
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You can download all the manuals here:

http://www.barrygrant.com/pages/manuals.aspx

Please read them, -a lot easier, than us writing a long story about whats in the manual...

Happy tuning!
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Old 05-09-2005, 02:14 PM
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I was looking

Hi, 59vette

I was looking to barry grant internet sites, I not find the answer to my question, the only thing I want to know, is if I have to turn the mixte screw clockwise or counterwise to solve my problem (black spark plug, too much gaz!!)

Do I have to turn clockwise to put more air or inverse???

That's I want to know!

The internet cut you was sending me was resolve my idle speed screw question, but not my other problem...My main probleme concern.

Stephane

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Originally Posted by 59vette
You can download all the manuals here:

http://www.barrygrant.com/pages/manuals.aspx

Please read them, -a lot easier, than us writing a long story about whats in the manual...

Happy tuning!
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Old 05-09-2005, 02:37 PM
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No offence, but on page six, last paragraph of the MD manual it says:

Turning the screws in, clockwise, reduces the
amount of idle fuel and leans the idle mixture.
Backing the screws out increases idle fuel and
enriches the idle mixture.

This would mean that you must turn them in = clockwise to reduce the amount of fuel added at idle...

Hope I understood your question right?...



/59Vette
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Old 05-09-2005, 03:17 PM
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another question

OK, I have another question, if you said, I have to turn the screws ''IN'', clockwise, this is right for the back screws on passenger side, but for the front, If I turn this screw clockwise, I turn this screw OUT, not ''IN'' as you explain in your last sentence.

Do you understand what I mean... When I read the post, I understand this, If I turn both screw IN clockwise for the back screw, and counterclock wise for the front screw, or I turn the screw bu the middle of the carburetor) Thats I understand, am I right???

or, I have to turn the screw clockwise, the back and front screw...thats the word IN in your post I dont understant...(clockwise, reduce the fuel, and counterwise, put more fuel....Is that right...

Sorry, I'm french, I'm not almost bilingual...Hope you understant what I want to mean..

Quote:
Originally Posted by 59vette
No offence, but on page six, last paragraph of the MD manual it says:

Turning the screws in, clockwise, reduces the
amount of idle fuel and leans the idle mixture.
Backing the screws out increases idle fuel and
enriches the idle mixture.

This would mean that you must turn them in = clockwise to reduce the amount of fuel added at idle...

Hope I understood your question right?...



/59Vette
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Old 05-09-2005, 06:53 PM
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By "in", they mean "tighter" or clockwise, no matter which screws you are talking about. The front and the back screws on the driver and passenger sides all give less fuel at idle when they are turned clockwise.
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Old 05-10-2005, 05:48 AM
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Finally understood

Thanks, I was finaly understand the tread yesterday, after read them carfully many times...

Thanks allot, it will be more easier to tune this car right now...

Have a nice day...



Quote:
Originally Posted by benwantland
By "in", they mean "tighter" or clockwise, no matter which screws you are talking about. The front and the back screws on the driver and passenger sides all give less fuel at idle when they are turned clockwise.
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Old 05-10-2005, 07:17 AM
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All Demon carburetors are set up so that screwing in (clockwise) on the mixture screws will lean it out, while coming out (counter clockwise) will richen up the idle mixture. Hope this clears it up.
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Old 05-10-2005, 04:51 PM
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Righty Tighty......Lefty Loosey Doesn't matter if you're upside down doing a split looking south and the carb is facing north-east. Right turn = leaner... Left turn = richer.

Hope that helps.

Larry
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