Anyone ever thought about using motorcycle Carburetors?

Had lots of communication with the guy who built the set up in post #13.

His set up would idle just fine and take small blips of throttle with no load just fine.

He said the biggest problem he faced was the fact that with the type of carbs he was using were garvity feed only and they did not like any kind of mechanical or electrical induced fuel pressure.

The setup also runs on alcohol and not gasoline.

 

Umm...true, but:

The reason for this is reversion of the intake charge - known as 'stand-off'. Even on an OEM induction setup has stand-off; removing the air cleaner leans out the A/F ratio.

A CV carb can run without a stock airbox, but a combination of velocity stacks and a box are needed to contain the stand-off. To make it work 'right', the intake of the airbox has to have an adjustable snorkel to 'tune' the airbox...it takes a few passes, but it can be done without a ton of dyno time.

 

It will run...but the throttle response ain't so great until the motor is spooled and WFO.

 

Lots of info guys...thanks..although it does make me wonder if its worth trying...or just stay with the good ole 4 barrel

Well if I could use them strictly as throttle bodies..with no fuel going through them..that would work wouldn't it...then I wouldn't have to deal with those issues..

anyway..this has at least been fuel for thought...

 

It's possible - you really have to understand how the carbs work to make 'em work, tho.

 

There's a guy in Sweden converting an S&S carb on a Harley to fuel injection. He thought about flipping the carb upside down so the float bowl was on top just to screw with people. I don't think he's got it done yet though.

 

I can't for the life of me remember where, maybe club hot rod, but I saw video of a slant six running snowmobile carbs, pretty wild.
CHAZ

 

great thread, lots of food for thought.

Moose bult an intake for a Mopar flathead six with some kind of M/C carbs, I think there are pics on his site.

When i lived in Wichita (88-92) there was a guy with a '46-'48 Chevy coupe, 235 motor, with S&S Super E carbs. (accelerator pumps!)

I just scored a pair of Stromberg/Zenith 175CD's and a pair of 175CD2's, I'm going to try to put three on my flathead six Mopar powered HA/GR, (cuz there are three intake ports)

I've always wondered about the car's fuel pressure, since pretty much all M/C carbs are gravity feed. Maybe some sort of home brewed float chamber that shut off the pump feed before the chamber built pressure?

 

Not a 6 but Pinto 4 http://www.esslingeracing.com/

 

Ran 38mm mikunis, set up for methanol, on my minisprint with electric fuel pump. A good quality press. reg. set at about 3 worked fine.

 

OK so maybe this won't work for the same reasons a log won't, but here's a dumb idea I had. Bolt on in place of a regular 4 barrel and run all the throttle cables to the center before going back to the pedal.

 

Yup,if it would work without the "log" effect of the plenum,(i'm thinking), you could have a circular or "master" bellcrank in the center,
then links to individual carbs.

 

i`d give the cv carbs a try, my honda ones have an accelerator pump and you can run a 4 into 1 cable setup. what do you have to loose by trying those old carbs are free.

 

I think this is the same motor as post 13.The car ran like a banshee on a gravity fed alcohol fuel system.A lot more going on here than motorcycle carbs though.I like the converted exhaust to intake manifolds.Cam?This motor is like eating icecream to fast.I think it's a minnesota car.

 

Anyone know why we're seeing accelerator pumps on CV bike carbs lately? Seems like it shouldn't be necessary.

 

1980 honda cb750 twin cam, arrow points to the accelerator pump that in turn is conected to a tube running to all 4 carbs.

 

huh - so it's not lately. Why is it needed?

bitchin' arrow BTW :-D

 

Wow!..I never would have expected this much discussion...lol, honestly...I figured I'd get more of..WTF is this guy thinking..

This was my first major post on this site...I love this place...

Seems like a lot of ppl here have the same thoughts as me...take something odd or something that nobody else wants..and not only make it cool..but make it work!

I guess I'm going to have to join the Alliance and get one of those cool plates...but then I'd have to choose which ride to stick it on...

 

That doesn't make total sense to me.

Most of the brit and jap bikes of the 70s ran a single carb on a manifold for the base models, and duals for the sport models, same carbs.

But, what do I know...

Rich

 

The difference is a single carb on a split manifold going to both cylinders verses multiple carbs feeding a common intake. The dual carbs used separate manifolds.

 

Uhhhh... from the list in your sig I'd say there is no choice...

 

Try and get a look under the hood of a Triumph Stag or Rover SDI sedan from the 70's with the 3 litre Stag V8 or Rover 3.5 litre V8 (Alloy Buick) Both these engines ran a pair of big SU's in a 'cross ram' setup.

I had a mate in the 60's drag racing an FJ Holden (Aussie GM) with a factory straight 6 in it. The stock head had siamesed intakes, so he cut up a 12 port head (off a Vauxhall I think) and shortened it to fit the Holden block. He then had a reverse grind cam made to switch exhaust and intake lobes, then built an intake system using 6 x 1" SU's, one for each cylinder.

Bloody thing ran like stink when he could get it all working, then coughed its guts up when he got it to the strip. The carbs were so close together he had the bowls mounted on the inner guard and ran fuel lines to them.

Looked awesome, was an absolute mongrel to work on.

Cheers, Glen.

 

I guess I can assume your talking about the 37 Pontiac?...

 

Hey Guys,

I wanna revive this thread because at the Blacktop Bash this past weekend, I saw hotrod truck with a Straight Eight Bufford in it, fed by 6 mikuni's. The guy was runnin the dogshit out of it up and down the road, and it didn't sound like it had any driveability issues. Wish I had brought my camera, because I'm not exactly sure what kind of mikuni's they were, but I do know that it was run into a log type manifold, and Oh yeah... it was completely BADASS!! Now I wanna ditch my three deuces, and build a manifold to run 8 of these things on my sbc.

Anyone here own that Buick powered truck, or know who he is?

 

There's a guy here on the list (Dolmetsch) who's
running 6 floatless Tilotson snowmobile carbs on
his Mopar slant-6 powered 'Senior Dragster"
with good results. Back in the '60's a few boat
racers used 8 floatless Tilotson carbs on small
block Chevies in the under 5-liter Hydroplane
classes. I remember one of the car mags 'back in
the day' - circa late '60's - Hot Rod - I think, did
an article them.

Mart3406
=====================

 

the reverse flow chev was in anoka car show today and i heard it run at show and heard it run down the road, they look like a Honda set up. my bud talked to guy and it is a 40 MPH car due to it not being able to stay on road due to snakey beam axle
it runs nice and sounds decent, starts just by reaching in and turn key

the honda carbs in a frame are nice why not try some???

 

I didnt read all the replies, but I actually had a dream once and it was about this very same thing. If you had a SBF, and took the lower half of the 5.0 intake plenum, it has 8 individual runners. In my dream I made a T going into each runner, and had a small motorcycle carb on each end of the T. So on the little V8 you would have 16 carbs!! Would look sweet, but put you in the looney bin trying to get it all tuned. The big advanatge would be able to tune you runner length, very easy if you made slip joints in the long vertical part of the T.

 

I'd love to see that reverse flow chevy. I remember reading in HotRod/Car Craft a few years back about a Flattie that was done similar, but both the intake, and exhaust were up top... wild.

Anyhow, I'll check into the Honda carbs. Thanks for the tip.

 

A Nail head was done that way back in the 60's. It was said it the intake flowed better that way than the normal way.
Motorcycle carbs dont now what there sucking for so why not. A carb is a carb, dont over think that last line.

 

Ck some hotrod mags ak miller ran mc carbs on for 6 cylinder at salt flats in street car.