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Author Topic:   Progressive carb or all open at once?
Dirt Maniac

Total posts: 120
posted May 08, 2005 02:54 PM  
I am currently barrowing a Bolaws carb that has a progressive linkage. The primaries open first then after about 1/3 throttle the secondaries open. A friend had a carb that all four opened at the same time. I can see a little bit better throttle control with the progressive setup in the corners, but maybe this is old school and I need a carb that open up all 4 at the same time.

The shafts are worn out and I found the top of the head of one of the screws holding a butterfly on the shaft had broken off. So I got the ok to look for another alcohol carb. The Bolaws is a double pumper and seems pretty strong. I can't really afford a Demon with the replaceable sleeves, I wish I could though, but somewhere between 4 and 700 dollars should get me a decent usable alcohol carb........maybe?

Any thoughts on this?


Dirt Maniac

Total posts: 116
posted May 08, 2005 03:47 PM  
Holley 4150HP. (For alcohol) You cant go wrong.

Dirt Maniac

Total posts: 196
posted May 08, 2005 04:05 PM  
I have a barry grant with the replacable sleeves.Dont really need it so i will sell it for $550.I Just spent $200 on a rebuild.
.It has the blue sleeves whcih makes it a 825cfm but you can make it any size you want.

Dirt Maniac

Total posts: 196
posted May 13, 2005 03:03 PM  
Does anybody have a preference on the linkage being 1 to 1 or not?I think holley says there oval track carbs come that way?

Dirt Forum Champ
Total posts: 2007
posted May 13, 2005 03:15 PM  
I think the 1:1 linkage is better. Because you have more throttle control over the entire range of movement. With the progressive linkage once you start opening the secondaries they come on fast. The 1:1 lets you feather both primary and secondary over the whole range

Dirt Forum Champ
Total posts: 1019
posted May 13, 2005 03:25 PM  
Why not have your existing carb repaired and restored to original condition and then try 1:1 linkage but retain the option of simply swapping back to the progressive linkage if you don't like it?
We do repairs and restorations like that all the time...


Dirt Full Roller

Total posts: 32
posted May 14, 2005 11:02 AM  
Hey Wallbanger, If he doesn't want that carb I may be interested.

Dirt Forum Champ
Total posts: 755
posted May 16, 2005 09:12 AM  
I wish I could though, but somewhere between 4 and 700 dollars should get me a decent usable alcohol carb........maybe?

Yes you should be able to find a used alky carb for 4-700 dollars no problem. I sold a Gaerte and a Demon on here last fall for around 3-400 If I remember right.

I think the responsiveness with the carb and how the butterfly's open is more of a driver preference/track condition thing.

Figure out what you need as a driver. I prefer it to be to where the secondaries open up almost as soon as the primaries so when I put my foot in it, I get instantaneous power. It depends alot on how smooth you are with your foot and the track surface.

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