Here are better pictures, as far as tuning carbs, how much time do bike riders spend tuning their carbs. Initial time to get them set up is the most time consuming.
Richard
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| Bike Carbs Anyone? https://www.slantsix.org/forum/viewtopic.php?t=42489 |
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| Author: | 60 Plymouth [ Thu Nov 04, 2010 6:47 am ] |
| Post subject: | Bike Carbs Anyone? |
Over here in the UK is a magazine called Classic Ford, and it deals with all the stuff produced by the FoMoCo in Europe, such as Zephyrs and Zodiacs, Capris, the Essex V6 engine (not the same as the Canadian one) and literally hundreds of ways of playing with four port engines (Such as our Pinto and Kent engines). Although I'm not into the European Ford scene, I get the mag occasionally because it is a cracking read. Covers everything from suspension design through engine tuning to bodywork and panel beating. Seems the Euroford guys have a similar low-budget inventive attitude that many sli6ers here do. This month I had a copy and there was an article on using bike carbs (constant vacuum) on the four pot engines. The carbs match up surprisingly well for such a different sized engine because small fast revving bike engines and large slow revving four pots tend to consume the same amount of air. Also, being a constant vacuum carb, sizing them to the engine isn't so critical (as long as you don't strangle it!). Modern bike carbs can certainly be had reasonably cheaply over here and some people even swap them in on an originally EFI'd engine (with some ignition reworks of course). I was wondering if anybody had tried the same thing on our Slant 6 engines? I'd be interested to see if anybody has ever thought about fitting a one-carb-per-cylinder setup . . . . |
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| Author: | 66aCUDA [ Thu Nov 04, 2010 7:40 am ] |
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Look for the senior dragster project in the racing section. He ran 6 snow mobile carbs on his rail. Frank |
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| Author: | Mike'68Dart [ Thu Nov 04, 2010 8:44 am ] |
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Something like this...??? http://slantsix.org/forum/viewtopic.php ... uni#241244 |
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| Author: | 60 Plymouth [ Thu Nov 04, 2010 10:25 am ] |
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Yeah, just like these! No amount of searching seemed to turn these two up. How do they drive? Anybody else running them on the road? |
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| Author: | Fopar [ Thu Nov 04, 2010 10:57 am ] |
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They drive quite well on the street, get good mileage and off idle performance. I am considering building another manifold to fit 40mm carbs to see if they will work as well as the 36mm carbs. With 2.8 rear gears on the freeway (I-5) from Redding, Calif to Eugene, Ore at 70 or so mph got 21.9 mpg (the spark plugs are colored about like a brown paper sack). Richard |
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| Author: | Polara1974 [ Thu Nov 04, 2010 11:45 am ] |
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you should look for Mikuni carbs from '80 bikes, those carbs are great to play with and you sure can make them work almost anywhere. I can't figure out Fopar carbs from the picture, but that looks like a very nice set up he got there!!!!! For multiple carbs setup i think that the best bet for a Slant Six is the 3-45DCOE Webers, those are the BEST carbs you can get and I think that in UK there should be a lot of sources to find decent ones or even new ones. Second choice for me will be 6 Mikunis on a custom built manifold. Latter is the discussion about if all the trouble is worth the effort for going multiple carbs direction instead of a 4BBL or Holley 2300 2BBL set-up ... My answer to that question is YES, but not all the people think the same way. The drawback is that you MUST be very involved in carb tunning. Martin |
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| Author: | Fopar [ Thu Nov 04, 2010 1:45 pm ] |
| Post subject: | |
Here are better pictures, as far as tuning carbs, how much time do bike riders spend tuning their carbs. Initial time to get them set up is the most time consuming. Richard |
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| Author: | 60 Plymouth [ Thu Nov 04, 2010 2:17 pm ] |
| Post subject: | |
Great replies guys, I really like the set up you have there Fopar, and not bag gas mileage either. That's the figure you posted for the Redding meet? Did that 21.9mpg include a few passes on the strip? As far as my own set up goes - not going to happen for a while! Keeping the old girl running in pretty good tune whilst sorting the rest of the mechanics and the bodywork take priority. But it's somthing I'd like to play with, I keep an eye out for free/next to nothing carbs and parts at swapmeets and the like so I've got some bits to put together. What about ported vacuum advance? Do you run it from one carb, or T them all together to get an 'average' signal? |
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| Author: | Fopar [ Thu Nov 04, 2010 3:18 pm ] |
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The mileage is with no drag runs but there is a few 6% grades to get from Redding to Eugene (some up some down). Don't run any vacuum adv on my set up, just mechanical (10 to 12 initial 28 to 30 full). Richard |
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| Author: | 60 Plymouth [ Fri Nov 05, 2010 3:43 am ] |
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Hi Fopar, That's excellent info. Interesting that you don't run any vac and still get good mileage. I thought that manifold vacuum might be the best option, this would require a dizzy that's been recurved specifically to use manifold (less initial advance since you get maximum vacuum as soon as the engine fires with the throttle closed, and maybe a slightly faster mechanical curve?). Don't know - it's all on paper anyway at the moment. I know a few automotive engineer bike racers, so there's no lack of knowledge available from them! |
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