: Carburetion Q's


Scott@Rockstomper
08-01-2002, 09:55 AM
I'm feeling sorta out-of-it at the moment, and had this warped thought about carburetion.

The new Holley Truck Avenger is a 670 CFM carb. Much more than needed for a Toy four-popper.

From what everybody who's got one so far tells me, it runs almost like injection, but without the electronics hassles.

If you jetted it down to make up for the reduced air/fuel requirements of the 22R, (can you jet a 670 down that far?) and made an adapter plate, is there even a chance of it working?

I'm wondering if (with a decent exhaust) that'd make for a reasonably powerful 22R, but more importantly, one that runs better at angles.

I already know, just get EFI, but I like looking around at other options even if I don't end up using them.

Shepper
08-01-2002, 10:19 AM
It looks like they make a 570 version of the avenger. At least you might have a chance with that one.

I've never had very good luck jetting an oversized carb down on an engine. I think when you get to a certain point, you're just sucking too much air. I'm no carb. wizz, so I can't ramble numbers for you.

You could always do the setup you think would work with any old 4bbl carb and jet it down. Then if it doesn't work, at least you didn't blow a bunch of money on the Holley.

Ratbasturd
08-01-2002, 12:26 PM
why such a big carb?
I run a webber that does really well at high angle.
You are talking about a 22R ?

steveh
08-01-2002, 02:09 PM
It's still way to big CFM wise. A stock carb in good shape will work better wheeling on a 22r than a any 4bbl. Scott, you should swap to EFI if your sticking with the 4

Tankota
08-01-2002, 03:09 PM
I knew a guy who tried to put the analog 2 barrel holly projection on his 3.8 liter buick that was in his '84 toy. It ran too rich no matter what he did to it.

Not quite the same as a carb but my guess is that you would be spending alot of money on a carb that may never work for your application.

I saw a propane setup on a toy buggy last weekend that looked pretty good. 8 gallon tank and regulator/heater and a throttle body. The guy said it was like running fuel injection without the electronics. Sounds good to me except for the power/mileage loss (get a bigger motor and the problem is solved :D )

Coop 50
08-01-2002, 11:00 PM
This is from www.bob2000.com/carb.htm

He is a self professed Holley carb guy

Carburetors are really just dumb fuel and air mixers. Any source of airflow through a carb will draw fuel. This is why a carb for a 460 c.i. engine will also work on a 260 c.i. engine. The performance may not be optimum due to signal strength or restrictions, but if the jetting is close for one, it will be close for the other. 2 examples: I took the 600 cfm carb off my 390 truck and put it on my 4 cylinder Pinto. The jetting was right on! My Pop took the 390 cfm Holley off my Pinto and put it on his 390 powered 62 Thunderbird. The mixture was right on. This is why it is important to know what jets your carb came with, and to start out with those jets.

skulltoy
08-01-2002, 11:10 PM
Scott, I'm the one that bought that 22re from you. I never got the time to put it in so I did the carb mods that toyfamily did to his buggy and mine works fine. I've had it straight up and down with the tail lights in the mud, and rolled it onto it's side and it still always kept running! I saw Aaron running your truck at Kremmling and it seemed to die alot at angles, try those mods they worked for me! Or better yet I'll sell that engine back to ya if you want! PM me if interested or if you know anyone else. Jason

dunehopper027
08-04-2002, 08:15 AM
what carb mods did you do?

skulltoy
08-04-2002, 08:21 AM
Put a hose on the bowl overflow (the little brass tube on the top) so that when the bowls overflow it goes to waste not into the carb. Put an eletric fuel pump on it.