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

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  #51  
Old 24th July 2021
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Quote:
Originally Posted by DR DICK View Post
respectably gentlemen there has been one no commenting that there are two different side bowl s&s carbs.

im not talking about throat size. im talking about fuel/air circuitry.

whats being shown here isnt an L series its an 'early'.
L and early are not the same.

bottom line anyone comparing an e carb (f or g) to an L series ----- you guys take it from here.
As most won't look up the Dr's sand cast carb article; here's an illustration to show the basic differences between the carbs:




It was beyond a pleasure and a treat to hold Leo's carb. I'm still excited.

I've also had the chance to also hold an early gas carb at Davenport.

I made a horrible mistake of thinking as many that the L and the early were the same . . .and when my buddy brought the early to davenport for us to discuss and get a lesson from the Doc, I realized instantly that I knew nothing I thought I did.

Put simply, one of these things is not like the other.

Hopefully its a bit more clear Leo Payne really did design and develop a carb.
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  #52  
Old 24th July 2021
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post #65 http://xlforum.net/forums/showthread...1022912&page=7 from 2011.
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  #53  
Old 25th July 2021
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What it all points to is there is no one perfect carb for all Sportster engines.

You would need to clarify what your engine is and what you use it for. The posts by the Doc clearly point that out.

But we all like pictures of race stuff, historical stuff and unusual stuff.

So come on, anyone running a Bing on their K or IH shows us that !
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  #54  
Old 25th July 2021
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Default more S+S carb history

S+S carb history from 1985 S+S catalog.



Pics of early G carbs. Bottom feed float bowl. Early mainjet on top, current S+S jet on bottom



This is early carb G-115 with a GAL top feed bowl. The bowl spacer increases capacity. It has a tube to show the gas level and by turning the needle seat in or out the gas level can be adjusted without removing the bowl. The large brass hex is a lock nut. There is a baffle in the spacer to keep the gas from rushing too fast to or away from the main well.

Most of these carbs have a intermediate air bleed with a check ball. This one came with a 1/4-20 aluminum screw with a hole through the middle that served as the air bleed, as shown in the catalog and parts diagram. Without the check valve the intake pulsing at idle would squirt a stream of gas out the air bleed. The check valves have a 5/16-24 thread but instead of tapping the carb to 5/16 I have an adapter 1/4 on one end and 5/16 on the other.




Some differences between early and GAL carbs:
A harley air cleaner can go on a GAL. Not on an early.
Early is a bottom feed bowl, GAL is top feed.
GAL has an integral choke plate, early does not.
Both are 1-7/8 carbs where they meet the manifold but I think the venturi in the early is slightly bigger, though I no longer have an GAL to verify that. Venturi diameter of the early ones I have range from 1.630 to 1.660.
The GAL has a Intermediate tube through the center of the venturi like a bendix and the early does not. Those tubes can disrupt the air flow so I believe the early can flow slightly more air at wide open.
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  #55  
Old 25th July 2021
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thanks for posting needspeed.i now know my Super B is an early version with the bowl vent at the top of the carb.
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  #56  
Old 25th July 2021
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So the "perfect" piece does not exist...

IMO the BEST union would be a selection of the rider/builder with their knowledge & expertise for the installation.

My newly acquired XLCH has a Bing.... NO its a Bendix. From what I have read it is an inexpensive piece for a build {I have yet to start & evaluate it performance}. What I want is something that starts well with good performance to about 5k.

For my FXR I chose to run the stock Keihin butterfly. With the EV27 cam and low redline it works just fine, that is after weighing the options. The S&S piece just weighed to much to hang on the engine and the vacuum slide Keihins {having used them forever} were boring.

Last edited by Fivecats; 31st July 2021 at 22:43.. Reason: incorrect carburetor noted
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  #57  
Old 25th July 2021
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this thread started as a display of a 50 yr old pioneering component that was fitted to land speed setting sportster.

if a linkert was on that bike wouldnt we be posting about that?
but we aint are we?

so:
lets be honest.
so maybe before making comparisons to linkerts you share your linkert posts.

not being a wise ass. if comparing to something show both sides please.

"my carb is bigger than your carb" may have been averted if
the title of this thread was something like "check it out leo paynes recrord setting carb"

can we be more straight up?
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  #58  
Old 25th July 2021
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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 ?
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  #59  
Old 25th July 2021
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I get bored myself at times and when nothing seems to be happening I like to throw a grenade into the fire.
What's the best Carb/oil/ignition system is always a slightly controversial subject as far too many people don't specify enough parameters to really produce a definitive answer.

It's a bit like saying "What's the best Sportster ever built ?" and then posting a photo of your own bike.

I myself would also love to see and to know where the engines these carbs came off have gone to now.
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  #60  
Old 26th July 2021
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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
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Last edited by thefrenchowl; 26th July 2021 at 10:33..
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