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

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  #21  
Old 4 Weeks Ago
Ferrous Head's Avatar
Ferrous Head Ferrous Head is offline
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When I first tried to "Log Book" my sidecar for racing I specified ab S&S Super B for it. Strictly speaking it was not allowed in the rule book. I run Period 3 which means the basic components had to be available in 1962. The Super B clearly wasn't.
But once I explained to the rules committee that this was basically the same as a Stromberg carburetor supplied on the 1934 Ford V8, except not as sophisticated, they let me run it.

I would try a Yost on there except I don't think anyone's done one for Methanol.

The poor old Ironhead is crying out for ANYTHING that will atomize and distribute fuel better. Modern design heads introduce swirl and squish which goes along way towards getting complete combustion.

Ideally, we have 13 (aprox) molecules of fuel surrounding every molecule of gas.

How often do you think that actually happens ?

The easiest (and best) mod you can make is to simply drill and tap the air bleed hole to take a jet. That allows you to reduce the rich area between inter and main circuits.

The serious way to do this is with a dyno so you can actually see what the A/F curve does when you change things.
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  #22  
Old 4 Weeks Ago
kitabel kitabel is offline
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Even the Yost does not completely vaporize all liquid - they could have, but didn't want to. I'd explain this, but I already did.
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Making the air correction adjustable is valuable, but the effect is closer to linear compared to changing the hole pattern in the emulsion tube.
As engine RPM rises, each hole (from the top) is uncovered and begins to supply air to the fuel inside the tube. Hole size determines how much air, its height determines when.
If the engine is too small, the lowest hole will never "open". If the engine is too large, there will be no air added at top RPM. The air jet adjusts the whole range.
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  #24  
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Yes, but the air bleed is an easy fix.

The Super B's intermediate and main jet range overlaps. This means you wind up with both jets supplying fuel at the same time. They all start out running rich to start with if you have the correct main and inter.
If you drill and tap the air bleed it's very easy to go up or down a jet size to "flatten the curve" (no pun intended) /
You can do it in between dyno runs in about 1 minute.
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When I was doing my air bleed jet, I drilled & tapped the carb body for the jet and then actually drilled out the orifice in the jet to 3/32”.
I soft soldered that jet hole closed and then drilled it out slightly smaller than the air bleed was originally.

I took a set of # drills, a pencil torch, solder, a screw driver, small vise grip and a pin vise out to the road.

I drove around and incrementally increased the orifice size using the drills. Keeping a little notebook of observations. Things got better and then went worse. I melted and redrilled the solder to the drill size I thought was best and left it that way. No need to have a bunch of different size jets while dialing in.

A good way to spend a Saturday afternoon driving home from a morning of machine shop OT.
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an adjustable air bleed is recommended when installing a Zippers thunderjet.are you running one on your sidecar motor Gene? i don't remember.
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Yes, I run one on my sidecar. I think it's a .046 in there. Memory only)

There is absolutely NO way I could run my sidecar on the street long enough to jet it there. And I'm a numbers man anyway. I have to see numbers. I know what 7 grand sounds like. I know what 7 grand feels like. But it's impossible to pick up the minor difference in the mid range with an engine like this.

For a start, the cops really aren't that keen on an Unlimited Period 3 Sidecar with an open pipe doing laps in my suburb. Jessie and Brett are ok but some of the new cops out on patrol have no respect.

Last year, even one of my neighbors came down and complained to me.

(And I suspect that took a helluva lot of courage.)
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Quote:
Originally Posted by Ferrous Head View Post
Yes, I run one on my sidecar. I think it's a .046 in there. Memory only)

There is absolutely NO way I could run my sidecar on the street long enough to jet it there. And I'm a numbers man anyway. I have to see numbers. I know what 7 grand sounds like. I know what 7 grand feels like. But it's impossible to pick up the minor difference in the mid range with an engine like this.

For a start, the cops really aren't that keen on an Unlimited Period 3 Sidecar with an open pipe doing laps in my suburb. Jessie and Brett are ok but some of the new cops out on patrol have no respect.

Last year, even one of my neighbors came down and complained to me.

(And I suspect that took a helluva lot of courage.)
and that's kinda like me makin laps around the neighborhood on my drag race ironhead.gotta do it ever once in awhile,hahaha.got pulled over in my driveway(after my first bad wreck)by the highway patrol.he seemed to know me so I talked my way out of anything so 1 time worked out for me.the second time I may end up in handcuffs hahaha
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