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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #61  
Old 26th July 2021
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Thanks Needspeed for your photos, but here's better scan of S&S history:





Patrick
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  #62  
Old 26th July 2021
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I was at one time very interested in the "Fuel" version of the Super.

While the gas version can be converted to alcohol simply with a larger needle and seat trying to provide fuel with an electric fuel pump is "problematical" to say the least. The larger needle and seat only acerbates the problem.
The trick is getting enough volume at the lower pressures required.

The "Fuel version of the carb overcomes this with something not mentioned in your article Patrick. The bowl also incorporates a return outlet to allow excess fuel to leave the bowl by a line rather than into the throat of the carby.

Seen as the slot bear the top of the bowl here.




This picture shows the two inlets and the rteurn (at the bottom of the pic)




here you can see the cam that controls the "extra" fuel required at larger throttle openings.

(Kind a rudimentary system)

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  #63  
Old 31st July 2021
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Quote:
Originally Posted by Ferrous Head View Post
I was kinda joking about the Bing.

These days you only find them on scooters AFAIK.

If you really have a Bing on there, I'd like to see that. I like unusual things. I've seen people run Lectrons and POSA's as well as Hilborn Mechanical Injection. Not to mention Webber's and Del'Orto's.

Anyone have any really unusual things hanging off there ?

The XLCH does have a Bendix, not a Bing. The "Baby Bings" are on the R50/5 Beemer.
My mistake... to many bikes
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  #64  
Old 31st July 2021
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I remember them from my mates R69S. Basically an Amal copy I think. Or did Amal copy from them ? But I don't think they ever built them with a big enough throat to run one on a Harley.

From memory (so probably wrong) but the Linkert Dc series were 1 1/2 inch. That's basically 38mm. Harley weren't in the business of "throttling" their engines to restrict top end performance so one would have to assume they ran the numbers and decided 38 mm gave them sufficient flow to feed the engine at max RPM.
They MAY well have erred on the cautious side though to protect the engines from being exploded by over zealous pilots.
I THINK (again from memory) the Tillotsons were 40 mm and the Bendix's were again 38 mm.
So it would seem a 38mm carb should be a good choice for a stock engine.

I don't like round slide type carbs on big bore engines. There is always some amount of stiction on the slide and the vacuum created when you snap the throttle shut at high rpm can hold the slide in place unless you have a sufficiently strong enough spring to return it. It all gets a lot worse as the slide/body wears.

A lot of people will argue that slide type carbs will flow more than the equivalent sized butterfly carb and that's true. But if you run a slightly bigger butterfly type carb that negates any advantage. If you run in a race class that stipulates maximum carby sizes (we have them here) then it can get complicated. But at the end of the day you just need a big enough size to feed your engine at maximum revs. More than that will only make you slower.
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  #65  
Old 1st August 2021
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what happened to this thread?


you guys have a chance to reverse engineer the actual record fuel carb used on payne's land speed setting bike.
but instead of doing that --- what???

seriously what is the matter with old timers who cant recognize the quantum leaps happened when you were standing right there?
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  #66  
Old 1st August 2021
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I think the problem is almost no one is building/using Ironhead race engines anymore.

I am always interested in seeing different approaches to doing these things. I haven't understood if the original poster actually has that carb that Leo ran or one something like it or even just pictures of it.

I can understand their need for a bigger carb to go on a much bigger engine. An given the application I can understand they were not concerned about idle quality or even the mid range.

I'm not even sure how they fed the carb on the streamliner. Gravity ? Where was the tank ? You need to have a fair bit of fuel to cover that distance at that speed so the whole fuel delivery system has to be taken into account.

And I have always wondered that the Bernoulli effect didn't play havoc with the open bell-mouth sitting sideways to the air-stream at over 250 MPH.
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  #67  
Old 1st August 2021
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that is something to wonder about (bernoulli) at that speed. Would think it had some effect...
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  #68  
Old 1st August 2021
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I honestly thought this was just done as a joke thread. Numerous.

Like asking what's the best oil for your Sportster ?

Or what's the best exhaust system for your Sportster ?

Or why is it both illegal AND immoral to paint a Sportster any color other than black ?
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  #69  
Old 1st August 2021
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Quote:
Originally Posted by Steve9 View Post
that is something to wonder about (bernoulli) at that speed. Would think it had some effect...
good on you.
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  #70  
Old 1st August 2021
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Some seem to have not seen this post..

Quote:
Originally Posted by thefrenchowl View Post
I'm not ashamed to post another Linkert DC...

Before the S&S Early came the unique S&S Early-Early!!!



I have 2 similar throttle bodies bored to fit the Tillotson butterfly:



They (George and Leo) couldn't make it flow big enough so the Early was born soon after...

Patrick
So there is a plain to see timeline that goes DC > Moded DC > Early > L...

Patrick

Last edited by thefrenchowl; 1st August 2021 at 11:25..
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