Multiple carbs on a 300
Thread Starter
|
Tuned
Joined: May 2005
Posts: 331
Likes: 0
Multiple carbs on a 300
As in... 6. 
I've been playing with bikes for too long I guess, but I'm curious. Anyone ever mounted one carb per cylinder as you would see on a street bike? I've seen a 300 with THREE side draft carbs, pretty slick.
Doing some quick figuring, a 300 has about 800 cc / cylinder. I'm thinking that if I were to find 6 motorcycle carbs from a 500cc bike, with some jetting (and carb syncing) this might be kinda fun- straight shot in to each cylinder. I'll probably never do it, but any ideas / suggestions?
I've been playing with bikes for too long I guess, but I'm curious. Anyone ever mounted one carb per cylinder as you would see on a street bike? I've seen a 300 with THREE side draft carbs, pretty slick.
Doing some quick figuring, a 300 has about 800 cc / cylinder. I'm thinking that if I were to find 6 motorcycle carbs from a 500cc bike, with some jetting (and carb syncing) this might be kinda fun- straight shot in to each cylinder. I'll probably never do it, but any ideas / suggestions?
Elder User
Joined: Feb 2004
Posts: 830
Likes: 0
From: Indiana
I remember a few years ago a guy had just that type of set up for sell on ebay. I recall he used motor cycle carbs on it but don't remember what type. Seems like he had a video link showing it running i think.
It could be done but would take quit a bit of time to make it work.
It could be done but would take quit a bit of time to make it work.
Post Fiend
Joined: Oct 2003
Posts: 6,949
Likes: 1
From: utica il
carb synching is hard enough on 2-4 cylinders, and I6's have poor flow to the 2 end cylinders. can it be done? sure. is it worth it? maybe for cool factor, but it would probably run like chit without a lot of thought and time put into it
Moderator
Joined: Dec 2007
Posts: 7,987
Likes: 104
From: Boise, Idaho
Setting it up is pretty easy. You would pretty only have to worry about a single runner to each cylinder. Probably could make it out of 6 stock intakes. Or, cut a hole into each runner and weld on a carb base. There was a guy who collected unusual intakes on Fordsix from swap meets and stuff. I wish I could find his pictures. He had pictures of a 6 1bbl carb intake in his collection.
TUNING it on the other hand would be the real task, and one I wouldn't want to mess with. If I were to, though, I'd get an exhaust shop to weld in an O2 sensor bung on each port of the exhaust manifold, so I could monitor each cylinder individually and tune one at a time.
In a sense, it's a lot like multi-port fuel injection, but tuning each fuel injector by hand instead of letting a computer do it.
TUNING it on the other hand would be the real task, and one I wouldn't want to mess with. If I were to, though, I'd get an exhaust shop to weld in an O2 sensor bung on each port of the exhaust manifold, so I could monitor each cylinder individually and tune one at a time.
In a sense, it's a lot like multi-port fuel injection, but tuning each fuel injector by hand instead of letting a computer do it.
Moderator
Joined: Dec 2007
Posts: 7,987
Likes: 104
From: Boise, Idaho
Forgot about this one. It's set up for 3 using the bottom half of the EFI intake. The picture of the top half being put on this seems to have been deleted. The THUMBNAIL still exists though, lol.
I can see how it'd be pretty easy to put attachments for 6 1bbl carbs onto it. Again though, I wouldn't want to be the one to tune it.
Elder User
Joined: Oct 2008
Posts: 708
Likes: 1
I thought the dellorto and weber style carbs had two barrels per carburetor and each barrel is individually tunable. So you only need three actual carbs to have all six cylinders completely isolated and independantly tunable. Am I wrong here? Or are motorcycle carbs different than these carbs?
Trending Topics
Lead Driver
Joined: Jul 2009
Posts: 6,477
Likes: 19
From: Sheffield, AL
While there are some motorcycles which have used dual throat carburetors and presently, the trend is more and more to use fuel injection, by and far most modern era motorcycles have had a practice of 1 carburetor per cylinder.
I once owned a very sweet 1979 Honda CBX with an inline 6 cylinder with 6 carburetors. Six cylinders and only 1047cc... each cylinder of our 4.9L engines equals ~817cc.
Some early twin cylinder engines shared one carburetor.
By the way, I still love motorcycles! I grew up with them and have an older dual purpose Japanese bike. [It looks great in the back of my true love... 1986 F150 with 4.9L power.]
I once owned a very sweet 1979 Honda CBX with an inline 6 cylinder with 6 carburetors. Six cylinders and only 1047cc... each cylinder of our 4.9L engines equals ~817cc.
Some early twin cylinder engines shared one carburetor.
By the way, I still love motorcycles! I grew up with them and have an older dual purpose Japanese bike. [It looks great in the back of my true love... 1986 F150 with 4.9L power.]
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
Thread Starter
|
Tuned
Joined: May 2005
Posts: 331
Likes: 0
Guess I should have been a bit more specific... My truck is a '76 F150. No o2 sensors. Heck, it barely has WIRES for that matter!
Tuning carbs really isnt that hard- IF you have the right tool for it, which I do.
I'm assuming the FI intake will bolt on to my carburated engine? Looks like what would be easiest is to get the bottom half like the picture shows and cut the curved part off leaving you with the straight shot in. From there it would be pretty easy to come up with some rubber tubing to clamp the carbs into and onto the manifold. Hard part would then be how to tie all the carbs together so they COULD be synced.
Think the carb I would chose for this would be 6 Mikuni BST 40's- they are a CV carb, butterfly controlled, are used on several big bikes including my KTM 640, so I'm familiar with them.
Tuning carbs really isnt that hard- IF you have the right tool for it, which I do.
I'm assuming the FI intake will bolt on to my carburated engine? Looks like what would be easiest is to get the bottom half like the picture shows and cut the curved part off leaving you with the straight shot in. From there it would be pretty easy to come up with some rubber tubing to clamp the carbs into and onto the manifold. Hard part would then be how to tie all the carbs together so they COULD be synced.
Think the carb I would chose for this would be 6 Mikuni BST 40's- they are a CV carb, butterfly controlled, are used on several big bikes including my KTM 640, so I'm familiar with them.
New User
Joined: Apr 2010
Posts: 2
Likes: 0
Ak Miller did it with three Weber dual-throat sidedraft carbs back in the sixties. I think it was in Hot Rod Magazine circa 1967. He put it in a Mustang and beat the pants off 283 Camaros and 321 (?) Firebirds. The thing was supposed to have amazing throttle response. He later upgraded it to mechanical fuel injection using Mercedes bits.
If you do an Amazon search for "Hot Rod Engine Annual" you might find the article on the second-hand market.
Miller also did a couple of build-ups on Mustangs with 200 and 250 sixes - "Horsing around with Ford's six" but that is not what I'm talking about.
By the way, Miller started his motorsports career with a flathead Ford six in a speedboat about 1952.
I think your thinking is right on the money with six motorbike carbs. I would go with 32 or 34mm Kehin CVKs.
Kugelbake
If you do an Amazon search for "Hot Rod Engine Annual" you might find the article on the second-hand market.
Miller also did a couple of build-ups on Mustangs with 200 and 250 sixes - "Horsing around with Ford's six" but that is not what I'm talking about.
By the way, Miller started his motorsports career with a flathead Ford six in a speedboat about 1952.
I think your thinking is right on the money with six motorbike carbs. I would go with 32 or 34mm Kehin CVKs.
Kugelbake
Moderator
Joined: Dec 2007
Posts: 7,987
Likes: 104
From: Boise, Idaho
Sounds like you're really on track to making this work. Got me intrigued. Yes, the EFI and carb block are 99% the same, so that intake will bolt right up like it's made for it. I have a pair of the EFI exhaust manifolds on mine and really like them.
Yes, the EFI and carb block are 99% the same, so that intake will bolt right up like it's made for it. I have a pair of the EFI exhaust manifolds on mine and really like them.
Logistics Pro
Joined: Nov 2009
Posts: 3,885
Likes: 12
From: Lawrence Swamp
you're really on track
Gorsh, I wuz gunna say 'dorkpunch' wuz what wuz needed.
Whadda U gunna do for the throttle cable, get a thick, long Lockar and unravel it into 6 seperate threads to sinc. the carbs?
Good luck,
cf
Gorsh, I wuz gunna say 'dorkpunch' wuz what wuz needed.
Whadda U gunna do for the throttle cable, get a thick, long Lockar and unravel it into 6 seperate threads to sinc. the carbs?
Good luck,
cf
Thread Starter
|
Tuned
Joined: May 2005
Posts: 331
Likes: 0
Not sure yet. If you're familiar with bikes with multiple carbs, there is only one throttle cable. The carbs are linked together in a way that the one carb that has the throttle cable attached opens the rest of the carbs, which is also how you sync them. I think the hard part will be getting fuel to all six carbs without making it look like a huge mess...
Logistics Pro
Joined: Nov 2009
Posts: 3,885
Likes: 12
From: Lawrence Swamp
just came from UMass 4th annual car extravaganza. The "M" Co. that jazzes up the 4 n 6 cyl beemers has a carb each cyl. (2002 tii, M5 etc). Only the 1st carb is cable style. The other 3 or 5 R bar or rod linkages like ur 300, old mustangs and some race cars...you know? Not so hard after all. Check out what Abandon Bronco did w/his carb linkage.
Thread
Thread Starter
Forum
Replies
Last Post
FordTruckChuck
1997 - 2003 F150
9
Jun 7, 2017 08:10 AM
TrailKroozr
Bed Covers, Tonneau covers, Toppers/Canopies & Bed liners
3
Feb 24, 2017 07:28 PM
TonySuzio
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
15
Feb 24, 2017 01:23 PM
