Another thought I had to make a Intake Manifold like the
Juans & LDwingnut manifold.
Is to take a spare Goldwing head with the OEM manifold's mounted, to the head down to my muffler shop, and have him mandrel bend a few U shaped tubes going from the front to the rear cyl's on the oem manifolds
Just happen to have a spare head in the shop with oem manifolds mounted.
Probably use some 1.3/8" OD x .055-.062 thin wall steel tube, with 1.25" ID silicone hose over the tube then pushed into the Oem manifold then clamped as this is a great tight seal, to the oem manifolds, it will take up the difference and have something stiff to clamp to, the connects would very easy also.
This seems like, to me, that it would have a better/Faster charge speed into the cyl.'s. as it would be the same ID as the Oem manifolds.
ID of the manifold, less of a larger air gap Volume, like the VW manifold has and more directed.
But i have to say that My GL1100 Is running excellent, so how can i get much better.
Have the muffler shop mandrel bend a couple of 180 degree U shaped manifold ends, this would be the 1-3/8" od steel tube, as this is the correct size thin wall Steel tubing to go from one manifold to the other,
U shaped, Like from Front to Rear cyl.'s on left side and Front to Rear cyl. on right side head, so they can be clamped in the oem manifolds,
then at the top or end of the bend open a hole, also the ID of the 1-3/8" steel tube.
Have muffler guy weld on a short piece of straight pipe on the new hole opening.
Now you could use that same Silicone hose 1-1/4"ID, between the two new piece's and the center section that muffler guy just bent w/ the short straight stub tube welded on.
Then a third piece could be made for the center section to mount the single barrel carb. Or a 2bbl carb.
You could have two different center section made, for each carb base,
Again using the same steel tubing for the center section and making a carb. mounting plate.
Those "U" shaped Manifolds would make some really Nice Dual carb.
I could probably crank out a set of dual carb manifolds out in a weekend, they seem like they would be pretty easy.
Have My Muffler guy mandrel bend me a couple of few pairs of them, he is cheap when it comes to that sort of thing
I wonder if two 32DFT's would be to much for a GL1100 or GL1200
I may build this manifold, Just to prove it, for my GL1200 Reverse trike project that is coming up for winter. i have 95% of what i need to complete this project
I will need to change connectors for my shop's 220V outlets, for my Compressor, Plasma Gun, and Welder, so they will be ready to go here at the new shop.
The Dual Carb manifolds would be good on a Reverse Trike with the Chevy Alternator off the front using 5" diameter pulley from tractor supply that charges at full from idle.
1983 GL1100 72K 32DFT Single 2-bbl Progressive Carb, and Runs Excellent,
1984 GL1200A 55K Reverse Trike Project, Single 2bbl. Progressive carb
1986 GL1200 Interstate, Now Naked, She just turned 43K
1988 GL1500/6 Phantom Grey 2-bbl SCC Trike Mustang GT Rearend, Rear Disc Brakes, HD Mufflers
2005 Burgman 650 20K
07' M109R 1855 miles 130hp 120ft lb torque Reverse Trike 99' Miata front suspension
2013 Honda NC700X 4k, AVG 77.68mpg
2015 Valkyrie, 4K miles Hot rod, Excellent bike