Is there a way to "tune" a new carb prior to installation?
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Normally if it is a brand new carby and is specced pretty good for your application ( ie not a 1050 dominator going on a 302 !) it should be pretty close out of the box. double check things like acc pump clearance and small things like that. Also the carbs come with instructions or dvds these days, have a read of them.
good luck !
good luck !
The Carb Shop will build to suite your needs,
http://www.thecarbshop.com/ourservices.html
http://www.thecarbshop.com/ourservices.html
SICK CAT: This is what I was after. Do you think they'll work on a Demon? I didn't see it mentioned on their website.
v8capri: Thanks. I've adjusted it per their instruction manual and still can't seem to get it dialed in. Wondering if there was something I was missing.
v8capri: Thanks. I've adjusted it per their instruction manual and still can't seem to get it dialed in. Wondering if there was something I was missing.
I'd give them a call, If this does not work out then try; http://www.barrygrant.com/demon/default.aspx?page=techsupport.
Also try a quick search on the net, you might have someone close.
Mark
Also try a quick search on the net, you might have someone close.
Mark
If your engine is basically stock, then a basically stock carb will probably not be too far from optimal. A little rich, but it will probably not be bad.
If your engine is not stock, then the only way to get a carb working properly is to either spend a whole bunch of time playing with jets, etc, or to pay someone who knows what they are doing to get you close.
I bought a Holley 700 that was "dyno tuned" for a Pantera. After buying it I realized that there really is no way that a carb dyno tuned for one engine can be optimally set up for a different one.
I installed the "tuned" Holley on my engine and it ran pretty terribly. I bought a complete set of jets from Holley and spent weeks pulling the carb off and adjusting stuff. I got closer, but not acceptable.
I finally threw in the towel and sent it to a specialist - Chuck Nuytten. He had a 5-page questionnaire - compression ratio, cam specs, vehicle weight, on and on. I sent him the carb and some money (I don't remember how much) and got a carb back that was right on.
One other owner - Chuck Engles - had his Nuytten tuned carb installed and then dyno tested his car. By fiddling with the carb and changing jets he was able to find an additional 2hp or something. That's pretty damn close to be optimal in my book, considering that he hadn't seen my engine!
I got tired of trying to get it dialed in myself and called an expert. If you have a non-stock engine (or would rather be driving than pulling the carb AGAIN!) then that may be a solution.
If your engine is not stock, then the only way to get a carb working properly is to either spend a whole bunch of time playing with jets, etc, or to pay someone who knows what they are doing to get you close.
I bought a Holley 700 that was "dyno tuned" for a Pantera. After buying it I realized that there really is no way that a carb dyno tuned for one engine can be optimally set up for a different one.
I installed the "tuned" Holley on my engine and it ran pretty terribly. I bought a complete set of jets from Holley and spent weeks pulling the carb off and adjusting stuff. I got closer, but not acceptable.
I finally threw in the towel and sent it to a specialist - Chuck Nuytten. He had a 5-page questionnaire - compression ratio, cam specs, vehicle weight, on and on. I sent him the carb and some money (I don't remember how much) and got a carb back that was right on.
One other owner - Chuck Engles - had his Nuytten tuned carb installed and then dyno tested his car. By fiddling with the carb and changing jets he was able to find an additional 2hp or something. That's pretty damn close to be optimal in my book, considering that he hadn't seen my engine!
I got tired of trying to get it dialed in myself and called an expert. If you have a non-stock engine (or would rather be driving than pulling the carb AGAIN!) then that may be a solution.
Charlie, Do you have a contact number for Chuck Nuytten?
Best tuning is done in a step procedure with a wide band O2 under normal in car conditions. But realize, that a Carb is NOT an accurate fuel metering device. I used a Wide band O2 to tune an Edelbrock on a near stock 350 chev and the best I could achieve was a range of 11.5 to 17:1 fuel ratio. Carbs just are not good. It is amazing, the Engine I tuned runs great and gets 20MPG in a 1983 pickup but the ratio is still all over the place. Even openloop EFI is better than a carb.
Crazy Dave, The more I think about it the more I want to go EFI!!!
SICK CAT: Called the Carb Shop today. They'll work on Demons but they sure don't like them. Takes twice as much time to tune and very inconsistent performance. They'll put them on the test engine, run them for awhile and they work just fine. Turn the engine off, let it sit for a half hour or so, start the engine again and it'll run like crap. He said they run great at WOT but then again "even a coffee can works great at WOT".
quote:Originally posted by Husker:
Charlie, Do you have a contact number for Chuck Nuytten?
http://www.chucknuytten.com/
Here's all the info you need
Charlie, Excellent. Thanks. Looks to be a great source.
One other advantage is that they work your carb so that it flows better. I'm not smart enough to know how much is hype, but after milling, polishing, etc my carb, the Holley 700 is supposed to flow like a 750 but with the responsiveness of a 700.
Oh, and they'll mill off your choke to improve airflow, most likely.
I'm happy with mine...
Oh, and they'll mill off your choke to improve airflow, most likely.
I'm happy with mine...
I submitted my forms this morning. We'll see what they have to say. From the looks of things they are very thorough. Can't wait to see the price list.