Bill Maropolis Racing Engines

OLD SCHOOL#6 wrote on 05/02/10 at 2:30pm:

You get them from Bill, it's a VDL...........

All a "go-no-go" test does is check to see if the venturi is stock.  Many other things can be done to the 4412.  Replacement base plates that measure 1 3/4", along with ported main body and a custom tailored racing metering block.  Also "modified" boosters help to improve fuel atomization, signal strength and mixture distribution.  These modifications can make a 500 cfm 4412 flow up to 600 cfm.

C&S  4412 carbs flow very  nicely.

formercrewguy wrote on 05/03/10 at 9:17am:

lol

Old School, I have to disagree with you somewhat. It depends on the track and the tools available to the track. At some tracks they will check not only the Venturis, but also the fuel boosters for opening size and height, the base plate and also the throttle/butterfly shaft size.

Perry25 wrote on 05/03/10 at 1:05pm:

Perry25 -- my post was basically a answer to this question ----

So who builds the best 4412 carb that will pass bakos go no go test? Is VDO the best or are there others better?

I agree with you, there are many more things that can be teched if the track rules say stock "no touch" 4412"s.  The E/W rule "was" just that, and when I teched their carbs I did not use a go-no-go gage, I used a pair of inside calipers becuase there are ways of making the venturi pass a go-no-go gage, (oval venturi), I also checked the boosters for size, and I had the guys remove the carb so I could tech the base plate for size, also the throttle shaft and butterflies for any machining.  Thats as far as I went becuase I figured those were the main places where performance could be picked up .................

if it works y take A CHANCE of having TROUBLE with others thts y i got mine not many people like to try off the wall stuff i mean if its not a good carb then y does most of the racers run one

i got mine cuz i barrowed one from a friend and had one ever since but whos cares if everyone runs them if there just OK then not very many people would have them but since everyone has them i think there BETTER than OK

Nothing is better than a VDL 2bbl period.  It feels like a 4bbl.  I've tried everything from Blake, Carb shop etc and VDL whoops on all.  Once they are ok in a class, you need to have one or you better find some extra HP somewhere else to make up for it. Almost impossible to police the metering block.  I've read some tracks swap the metering blocks in a no touch class but that would suck if you invested 6 large in a VDL carb.

b

i got my vdl out the door and shipped for 688...go to vdlfuelsystems.com