http://www.percyshp.com/adjustajet.html

Came across this from another forum with a guy looking at this for an old mopar.. he think with this he could switch easily between e85 and 93 octane...

Anyone using this? Thoughts, Ideas, Opinions?

Would it be an option, because isnt there other modification that is needed to be done to a carb to handle e85 and run properly?

 

Yes there are other considerations, but if you know what you're doing and set it up correctly, then it could be easy once everything is in place.

Having dual fuel systems would be a big plus.
A lot of guys that race with methanol have a separate system to run gasoline. It allows them easy cold starts to warm the engine up, and it also allows them to flush the alcohol from the carb and lines before putting the car away for the night. It's also much cheaper to cruise around on gasoline if you're not going to go WOT or load the engine.

Spark advance is easy to change by just flipping a switch if you have the right electronics.

In most cases the alcohol is used for high-load or WOT only, and those circuits can be jetted separately and no need to change back and forth once it's set up.

Cruise and idle jetting would need to change, but that's not such a big deal.

The total fuel capacity of the carb - large bowls & high-flow needle & seat assembly would be part of the conversion.

 

I can't open up the link because it's blocked by my work ISP.

But, this thread is linked in the "welcome to the car forum" sticky:

https://www.thirdgen.org/forums/carb...5-jetting.html

Since I can't open up your link right now, I'll assume they're talking about a Holley carb. To get the carb to properly run on E85, you need to alter the emulsion bleeds, idle restrictors, and power valve restrictors. More and more outfits are providing E85 conversions, but the Quick Fuel Technology E85 metering blocks p/n 34-106 get you well on the right path. You still need to jet up, and idle and high speed air bleed changes are still needed as well. Although I haven't tried it yet, I've also been told the floats should be set a little higher (has to do with the density of E85 vs. gasoline - closes the needle valve quicker). I did put larger needle valves in, but I don't think it made any difference at my power level.

I've been working on this for 3 seasons, I'm about to start my 4th season with E85. I haven't upped compression, which is the easiest way to benefit from E85. The QFT metering blocks helped a lot, but I'm still working out the air bleeds - I hope I'm finally to the point where it will idle cleanly without dying when the throttle closes or going around corners (very frustrating).

By the way, do NOT apply anything you've heard about methanol to E85. Completely different animals.

 

I see the linked page now.

If they had externally adjustable emulsion bleeds, and externally adjustable PV restrictors, and externally adjustable idle restrictors, and adjustable air bleeds, all which could be switched with one turn of a wrench. . .

It would be easier to have an E85 carb and a gasoline carb, and switch back & forth between them.