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

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  #1  
Old 11th May 2018
Keithybloodygeorge Keithybloodygeorge is offline
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Default 1967 XLCH stroker project

Hey guys Iím in the process of collecting parts to build a mild stroker of my mostly stock 67 CH so I figured now was probably a good time to jump on here, share my plans and tap into the collective wizardry that lives on this kick ass forum!

Iíve been following a number of the stroker builds over the past few years and they have fuelled my passion for these bikes even more and now of course I have to have one

Iíve been trying to learn what I can but Iím really keen to get stuck in and have a go now so Iím slowly collecting a few bits and pieces to throw at the build. I have big plans for some cases Iím sitting on which have already been heavily modified for a big bore stroker but thatís at least a year off so hopefully this is a good way to get some first hand experience before going all out on that one down the track.

My list at the moment is:

-T&O stroker crank: either 4.5, 4.5625 or 4.625, Iíll talk more about this decision shortly
- stroker pistons: I grabbed some MC supply pistons which Iíd seen floating around on eBay for sometime. They are listed as 10:1 900 bore pistons for KH wheels at 090 over which may raise some eyebrows but after reading some of dr dicks thoughts on them in another thread I figured stuff it, itís worth a shot
- sifton minus minus cams, Iíve got a full mag fired set but will probably just run the exhaust cams at this stage as it sounds like the intakes might be overkill on a sub 70Ē motor
- S&S Heavy duty rods, these might not be necessary but I got a deal with the cams so figured Iíd grab them just in case
- XLR style exhaust: i love the beautiful flow of the XLR front pipe and while the 2 into 1 I built for the bike a couple of years back has proven to work reasonably well despite being way too short in the rear header Iím keen to have a go a building an XLR style set of drag pipes maybe with a little twist thrown in just for the hell of it
- transmission: at this point Iím not sure what is required of the 900 transmissions for a sub 70 inch build so Iím all ears on this. At a minimum I know that one of my trap door bolts is a little bit suspect and my trans end play measurements are on the edge so Iím going to pull everything and make sure itís at least up to spec. Oh and Iíll probably take a look at reinforcing the trans corner while Iím there
- oil pump upgrade: Iím thinking about doing the 72-76(?) pump upgrade too. I donít know whether anything further is required with the pump but I donít think Iíll get too carried away with the more significant oiling system mods at this stage

I donít claim to know it all when it comes to these machines so Iím sure there is plenty I need to get my head around as part of this project. The amount of knowledge on this forum is humbling to say the least but the passion for these machines is something I definitely get

Hereís a few pics of the bike as it stands, pre-sissy bar chrome and also the pistons that Iíll come back with a few questions on shortly......




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  #2  
Old 11th May 2018
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very cool starting point, that bike! i really love the exhaust pipes!!
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  #3  
Old 11th May 2018
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Very cool.
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Old 11th May 2018
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On the mc brand pistons, I have them in my 59.

They expand like crazy and you need to give them quite a bit of clearance.

The first 30 seconds on a cold start are a bit noisy.
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  #5  
Old 11th May 2018
Keithybloodygeorge Keithybloodygeorge is offline
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Thanks Doodah and Dave, glad you approve

Good to know chuck, the clearance is definitely something I want to get right first time if at all possible. Iím ok with noise on start up if it avoids a stuck piston at full temp WOT

So the compression ratio and stroke options are what Iím trying to get my head around at the moment. They call these pistons 10:1 although Iíve never understood just how accurate that measurement is and obviously there are a heap of variables which can impact that figure. The 2 things Iím trying to get straight are:

-what the CR will be if I go either side of the 4 9/16 stroke. That stroke doesnít seem to be the easiest to get in a crank these days although T&O have said theyíll do one for me if need be. But also the strokes either side might give me the better target Static CR. See below
- what static CR do I really want to aim for to get a sensible corrected CR to run on 95/98 fuel. I also donít know what the effect of the cams etc will be. Iím guessing that a safe corrected CR might be more like 9:1 on his fuel. If anyone has experience with what sort of effect the minus minus cams have on the CR that would be great to hear

I had a play with some calcs for the CR just to test the water. I know this will not be completely accurate without a true combustion chamber volume but it kinda seemed like a decent enough place to start to see how much movement there is with the stroke

I landed here. Iím not completely sure Iíve got the equations fully nailed but I think itís close?


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  #6  
Old 11th May 2018
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Love the bike. That's going to be a great project.
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  #7  
Old 11th May 2018
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hmmm,those don't look like short skirts on the pistons.makes me think you'll need plates under the cylinders?with a stock frame there may be a clearance problem.something to think about.
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  #8  
Old 12th May 2018
Keithybloodygeorge Keithybloodygeorge is offline
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Thanks John!

Iíll take some measurements Bruce. The pin is definitely up a lot higher and I feel like the overall length is way down on stock but Iíll do some measuring


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  #9  
Old 12th May 2018
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I hope you're right.
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Old 12th May 2018
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this is what I've been looking at since 1978 this is S&S 3700 FOR 1000 C.C. bore.4-1/2''-4-5/8 stroke,no plates.the wrist pin location in your pistons looks similar,the skirts get my attention.
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