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Carb question

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zbob
curiousgeorge
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Post  curiousgeorge January 14th 2022, 6:20 pm

I’m working on building a mild street engine and I’m thinking it will need around an 850cfm carb. I have an 1190 King Demon and I was curious if it could be jetted down and used effectively? I will probably just sell it or trade for a smaller carb but figured I’d ask first.

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Post  zbob January 14th 2022, 8:50 pm

850 carb is too small for a bbf. been there done that. weld some bungs in your headers for a wide band set up. then go tune the bigger carb you have....

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Post  Gregaust January 15th 2022, 5:34 am

Have a look towards a 950... I had some years ago a 1090 Demon, it was a P.O.S . No matter what we did spending a whole afternoon on a chassis dyno could not get enough fuel out of it ..
Had a 2 circuit 1050 custom built by Performance Carbs in California . Still there to this day

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Post  curiousgeorge January 15th 2022, 8:59 am

It seems there’s no in between with a demon. They either work great or they don’t. I’ve never had an issue with this one and I ran it for 8-9 years. I have a guy wanting to trade me a 950 xp but now I’m on the fence about it.

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Post  BBFTorino January 15th 2022, 1:34 pm

curiousgeorge wrote:It seems there’s no in between with a demon. They either work great or they don’t. I’ve never had an issue with this one and I ran it for 8-9 years. I have a guy wanting to trade me a 950 xp but now I’m on the fence about it.
Trade him! Barry Grant stuff is junk!

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Post  rmcomprandy January 15th 2022, 4:01 pm

Where does this idea of "jetting down" or "jetting up" originate ...?

This is nothing but a bunch of hogwash ... the carb is still the same CFM size.

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Post  curiousgeorge January 15th 2022, 5:04 pm

BBFTorino wrote:
curiousgeorge wrote:It seems there’s no in between with a demon. They either work great or they don’t. I’ve never had an issue with this one and I ran it for 8-9 years. I have a guy wanting to trade me a 950 xp but now I’m on the fence about it.
Trade him! Barry Grant stuff is junk!

I’ve heard that but my experience with this carb has not been that they are junk. Required no more tuning than the 4150 on my brothers truck.

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Post  curiousgeorge January 15th 2022, 5:09 pm

rmcomprandy wrote:Where does this idea of "jetting down" or "jetting up" originate ...?

This is nothing but a bunch of hogwash ... the carb is still the same CFM size.

Sorry for using the generalized term “jetting down”. Maybe I should have said: Is installing the proper air bleeds, power valves, jets and tuning to achieve proper air/ fuel ratio was possible with a mild street motor.

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Post  BBFTorino January 15th 2022, 6:47 pm

curiousgeorge wrote:
rmcomprandy wrote:Where does this idea of "jetting down" or "jetting up" originate ...?

This is nothing but a bunch of hogwash ... the carb is still the same CFM size.

Sorry for using the generalized term “jetting down”. Maybe I should have said: Is installing the proper air bleeds, power valves, jets and tuning to achieve proper air/ fuel ratio was possible with a mild street motor.
In a word, yes. The CFM size only comes into play at wide open, or near wide open. At part throttle, the CFM is much less, and well within the usable parameters of the engine.
Tune it to run good at part throttle / cruise...and the WOT will be pretty close to optimal (But will still need some fine tuning to get it spot on,)

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Post  rmcomprandy January 15th 2022, 11:16 pm

curiousgeorge wrote:
rmcomprandy wrote:Where does this idea of "jetting down" or "jetting up" originate ...?

This is nothing but a bunch of hogwash ... the carb is still the same CFM size.

Sorry for using the generalized term “jetting down”. Maybe I should have said: Is installing the proper air bleeds, power valves, jets and tuning to achieve proper air/ fuel ratio was possible with a mild street motor.

The carb is still the same CFM size no matter what else you change, unless the actual ventui's are changeable.

Getting the correct air/fuel ratio will require certain jets and other stuff ... anything else won't work correctly with that carb.

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Post  Mark Miller January 16th 2022, 12:46 am

rmcomprandy wrote:Where does this idea of "jetting down" or "jetting up" originate ...?

This is nothing but a bunch of hogwash ... the carb is still the same CFM size.

I always get a laugh when people say wow that 1050 Dominator is going to be to much fuel for your engine,until i say you know that 1050 Cfm is an airflow rating not fuel!!

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