Barry Grant EFI Carbs

[ggl205]

I have three, brand new Barry Grant EFI carburetors similar to the Holley Sniper EFI. Don't know anything about them but the are very well made and have a few spare injectors that can be had as well.. I believe they are 750 cfm. Make me a reasonable offer for one or all three.

A little more digging produced the following link to the patent. Commercially, this throttle body was known as Barry Grant V.F.I. (Venturi assisted Fuel Injection). https://patents.google.com/patent/US5809972

John

[Jack Gifford]

Isn't "EFI carburetor" an oxymoron?

[ggl205]

True enough, Jack, EFI carburetor is an oxymoron but that is what these carbs are. EFI based on a carburetor body. Probably operates more like a throttle body but looks like a carburetor. Interesting concept because there is literally no change to induction other than swapping out a carb for one of these units. Of course, you will need a fuel computer to run them but so it goes with EFI. I think the Holley Sniper is a similar unit.

I did a little more digging and found the patent application for this EFI. It is called Barry Grant V.F.I. (Venturi assisted Fuel Injection).

https://patents.google.com/patent/US5809972

John

[Jack Gifford]

But any fuel injection requires significantly different fuel handling than a carburetor- fuel pressure an order of magnitude greater than for a carburetor, etc.

Note to readers: be advised that ggl205's edit of his original post (patent, etc.) occurred after my 1/27/21 post.

[ggl205]

Jack, I am not arguing merits of this system, only offering hardware that has existed. It may or may not be the best alternative to other EFI out there, I don?t know but it may have application. The patent reference was to give greater clarity to what the inventor had in mind and how he saw the device working.

John

[manta22]

"Injection carburetors" have been used on aircraft engines for decades.

[Jack Gifford]

John- I didn't read the full patent enough to answer this- are the various sensors (required by the EFI controller) built into the carburetor-looking device?

[ggl205]

Jack, I don?t know much about these devices. They belonged to Dave Dahlgren who did original prototyping for Barry Grant. The Holley unit similar to these have some fuel pressure control built in but other than that, injectors are controlled by an engine management computer just like a standard EFI system. That would also require various sensors necessary for the ECU to function properly. I read that some users had trouble with over fueling but I reckoned they did not map fuel properly in the ECU or likely did not have required sensors present for the ECU to manage correctly. No float bowl or other mechanical fuel regulation properties exist so fuel management is entirely up to the ECU.

John

[gh4462]

Are these BG carbs Long gone or do you still have one?

Glenn

[ggl205]

Glenn, I still have two of them.

John

[gh4462]

John, If you would like to sell the last two, or one, I am interested.

Glenn