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  #11  
Old 26th May 2020
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Hi FE,

Any G carb is not meant to run methanol... S&S told me so at the time I had mine as a gas carb on a 67 74ci CH...

But I'm stubborn and will do as I think fit so I moded it meself, quite involved and took some time.

One step was to get rid of the idle/mid range long jet that screws from the top and to put it all on the outside, that's all the clear nylon piping you can see on mine. This probably doubled the size of the emulsion tube...

Next was a new float chamber inlet valve, twice the diameter of the G one, so 4 times the area, plus 1/2" supply line and massive taps from Swagelok.



The carb would still starve a touch sometimes, so empty but moded S.U. float chamber was added on the side, it did help...

Bye for now, Gene...

Patrick
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  #12  
Old 26th May 2020
11B40 11B40 is offline
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Patrick, When Robert's bike was running a wet turbo he used an S&S GAL running on methanol. I don't think that much was done to it. On that first record run we ran, the float broke flooding the whole mess. This was at the turn for the return run. I put a float bowl and float from a spare GAL in the truck on for the return run and Robert did get the APS-AB-2000 record at 176. I'll ask him if there was anything done to it when I talk to him. Plenty of Fuel Sportsters ran GALs.
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  #13  
Old 26th May 2020
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Well, 11B40,

there are some differences, otherwise why would S&S have bothered at the time with a completely different fuel version?

Patrick
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  #14  
Old 26th May 2020
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Quote:
Originally Posted by thefrenchowl View Post





Patrick
interesting handlebar lever on the bike in the picture.i don't recognize it though.
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  #15  
Old 26th May 2020
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French bike called Durandal (the name of the magical/supposedly unbreakable sword owned by Roland, a nephew of the emperor Charlemagne. Circa 778 AD, Roland died in a Spanish ambush at the Pyrenees Roncevaux pass so he bears now that name, Roland de Roncevaux)

Pressed steel frame and forks, best models like this one fitted with Python 4 valves engines and 4 speeds foot change gearboxes from Rudge.



Made in Dijon where I used to live for a while...

Patrick
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  #16  
Old 27th May 2020
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Conversion for the Super B is easy and would most likely be my choice if i is to run on Methanol. B just needs blank jets drilled out and they have inters big enough to handle alcohol. The bowl needs to be modded to accept the big needle/seat but that's not hard to do. And I have a few spare alcohol needles and seats.
I was worried about the inter circuit which has stopped me so far from making the decision to try and run Meth in this engine.
Really I should look for an "F" carb if I want to do Meth or else just run the "B".
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  #17  
Old 6 Days Ago
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Default S&S MGAL update

I have 100 miles on the '66 XLH/XLCH with the MGAL carb.

Settled on the .040" intermediate long tube (jet) and the .072" main jet. I have the mixture screw 2 turns out. I'm running the classic S&S teardrop with a new S&S air filter element. The bike starts easy, idles steady and runs real good. The Autolite AT42 plugs are burning fine.

Gonna change the oil today then put a couple more tanks of gas through her and hopefully the MPG should be somewhere around 40. If so I will declare victory.
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Cap'N, how big is the engine ?

If I decide to run a G I am still not decided on the GBL or the MGAL

My thinking was the B version would be better for low to intermediate rpm's. I don't know the flow rates for the L Series carbs but just remember the A versions were used on the bigger engines and for things like Land Speed Racing where you really only need top end.

It's going on an 80 cube engine but I know the Super B flows well enough to handle that.

I don't know if the Super B flows better (or worse) than the L Series, but always assumed it was better.
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Old 6 Days Ago
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Stock 900 with .030" oversize pistons. Don't know much about these carbs but the A version is an 1 7/8" throat, same as the Super B. And the Super B that I run on My '69 XLCH (stock 900) is super smooth, runs great, starts easy and can get almost 50 mpg when not being flogged.

So with the B version of the L series at 1 3/4", The A, at 1 7/8" isn't too big for a 900 Sportster even though some claim it is. According to the S&S catalog I have the Super B is recommended for any H-D Big Twin or Sportster with any degree of mods including stock engines.

So the MGAL with the 1 7/8" throat should work on a 900 Sportster......and it does.
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Aha ! I keep forgetting the GAL is only the same size as the Super B.

I would probably have to run the MGAL rather than the GBL.

I think the Methanol setup is going to be more trouble than it's worth so maybe I can stop procrastinating and just settle on the MGAL. All becomes easy then.

Or maybe The Super B with an Accelo bowl ?
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