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

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  #81  
Old 10th December 2021
Ferrous Head's Avatar
Ferrous Head Ferrous Head is offline
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Posts: 7,539
Sportster/Buell Model: XLB, XLCH, Sporton
Sportster/Buell Year: 1962
Sportster/Buell Model #2: XLCH
Sportster/Buell Year #2: 1966
Other Motorcycle Model: XLCH (Another one)
Other Motorcycle Year: 1966
Reputation: 3070140
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I once (well, actually many times) thought about building my own engine.
From scratch. Casting the cases and other parts, doing the machine work and making something I could ride and call "mine".
I bought books on casting metal and got together the things I needed to make small metal castings. I had clean paper on a drawing board.
The plan was to build a simple. single cylinder engine.

But you quickly realise it;s not much more to build a twin.

And it's also smart to use other people parts, readily available, when you can. Things like pistons, cam shafts crank pins, a lot of the difficult parts already exists.

And I think Srociek was taking this route. far from totally, totally different he used as many HD parts as possible.

And I am grateful as it means finishing this thing off is not as big a challenge as I originally thought it would be.

But just a little disappointed he didn't correct the biggest hurdle to making power with an IH engine, the combustion chamber. The one concession is the central plug location.
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  #82  
Old 10th December 2021
Ferrous Head's Avatar
Ferrous Head Ferrous Head is offline
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Join Date: Jun 2009
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Posts: 7,539
Sportster/Buell Model: XLB, XLCH, Sporton
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Sportster/Buell Year #2: 1966
Other Motorcycle Model: XLCH (Another one)
Other Motorcycle Year: 1966
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Quote:
Originally Posted by Chuckthebeatertruck View Post
No you won't get .500 out of them. They will bind.

Coil bind averages around .791 on the Kibbles. Just not enough travel unless you are ok with running below .060 safety (I wouldn't) or really sink the hell out of the valves and re-radius the rocker tip to match.

In other words -- worry less and stick with a lift below .475. There's pretty much no reason to try and go higher on a street ridden bike these days.

I was never going to go too high with lift. I would like late closing intakes as this will be electric start.

I did in fact get approval from MA to run this engine in P4. But it's right on the limit at 1356 cc's. And I have no idea what the heads flow like but was always considering using the torque this engine should make.

I think I need to try one more time to contact Mr. Strociek. I still wonder about the history of this thing.
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