NGWClub®, Inc.

dontwantapickle wrote: ↑Tue Jan 12, 2021 1:16 pm

83Interstate wrote: ↑Tue Jan 12, 2021 12:59 pm I'm using a larger inner plenum to create somewhat of a "swirl pot" if you will. I think one of the reasons the single carbs tend to lose upper RPM Power is the fuel does not get a chance to mix well enough in a small plenum area. I may be wrong but this will be my first complete manifold I have built other than using a Type 3 Volkswagen manifold and a Ford
Escort carburetor with some rubber hose as runners.

I have always been of the mindset that it is the long intake runners that effect the high rpm power in
the single carb conversions.
Every single carb manifold that I have seen puts the carb farther away from the intake valves than the
stock setup does.

ericheath wrote: ↑Tue Jan 12, 2021 3:06 pm My 0.0002 cents. Watched various designs for over ten years now. The one spell where there seemed to be quite a few “successful” converts was after HOTT did his Weber 32/36 on an 1100. Now one “expert” had ridiculed anyone that attempted a 32/36 for being too large. His worked well. He made his own manifold, I think, others began using the VW adapter. Some with the VW adapter had issues until using the 2into1 adapter. Jake2012 also had a successful 32/36 along with a neat hidden alternator modification.

That was the major difference in HOTT’s though, and counterintuitive to what you’d think, he used a two-into-one carb adapter. They were designed to place a two barrel on a manifold designed for a one barrel. He used it in reverse. In the couple years that followed there were a number of people who reported similar successes with different carburetors. Theories are just theories, but most guessed the 2into1 adapter maintained or even sped up the charge as it moved into the lower manifold plenum.

HOTT has a couple successful two- carburetor transforms as well.

Another that I saw a video of in action and looked impressive used the VW adapter and a one barrel, but he used smaller runners from the VW manifold to the elbows of our Goldwings. I think they were only 1” in diameter. I thought that might choke it, but in the video he did a few higher rev accelerations through the gears and it was impressive. Speculation there was small runners helped maintain charge speed.

Whatever you design, I suggest trying to make one that can be adapted easily.

I’m leery of the big plenum without sloping the base towards the runners or welding whatever tubes you use to get right to the bottom. If you do have a place where fuel can pool and have a backfire, it could become more powerful with a puddle of gasoline there. I recall one PVC manifold that blew to bits. No one was hurt, but it could have been bad.

Good luck. Your starting out absolutely perfect: lots of pics.

dontwantapickle wrote: ↑Tue Jan 12, 2021 1:16 pm Every single carb manifold that I have seen puts the carb farther away from the intake valves than the
stock setup does.

ob1quixote wrote: ↑Sat Feb 06, 2021 6:45 pm How well does that set-up run with the uneven intake lengths?

gregforesi wrote: ↑Fri Feb 05, 2021 7:18 pm Stock carbs, just a different look. It runs like a stock 1000 and they use the stock synchronizers and air cutoff valve. I run them about 2 months a year (until I miss the bark and performance of the Webers).

IMG_0263.JPG