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

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  #11  
Old 25th January 2009
11B40 11B40 is offline
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Default You are plowing ground that has already been tilled

In the 60-70s all avenues of Sportster performance were thoroughly explored and proven. Take it from someone who has been there and done that, stroking a Sportster will give you more usable performance than anything you can do. It's a proven technology and when you ride one you won't believe the difference in performance. The Sportster is not a Japanese bike, it is 50s design utilizing hemi heads and cubic inches for performance not RPMs. As a matter of fact spinning a Sortster past 6K is just wasting your time. It will easily go to 6800 or 7000, but it won't do it rapidly. Putting on a set of shovelheads will just add extraordinary mounting and frame issues and if I am not mistaken the shovel doesn't flow as well as a Sportster. 1 7/8" XLR intakes and 1 3/4" exhausts will give you everything you need. If you want to go that way, sell the Ironhead and buy an Evo. It is 1990s design. An S&S 4 5/8" stroke will give you about 75" and that's strong power. Your big jug idea will not come close to it in seat of the pants horsepower, torque and acceleration.
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  #12  
Old 25th January 2009
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Quote:
Originally Posted by MouseChez View Post
im trying to get the bigger bore.....
I am not an expert on this, but it has been discussed here in the past. It is going down a wrong road to increase the bore as a route to more power. You can build a successful stroker - one member here has done it; but i think it too is a wrong road to follow.

Read the two books i referenced above.
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  #13  
Old 25th January 2009
11B40 11B40 is offline
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Default Mick: Tems of Thousands of people have done it

It was the thing to do. Every KH Harley had it's flywheels stolen to do this, then George Smith made them for everybody. The only down side is you may use a little more oil. I rode one for years. They are dead reliable. We are not talking about automobiles here! You ride a Sportster for performance, this is the ultimate trip for performance. You are not condemning your bike to a life of misery, it is no big deal and it can be reversed if you think you can't deal with the trauma.
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  #14  
Old 25th January 2009
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Quote:
Originally Posted by 11B40 View Post
It was the thing to do. Every KH Harley had it's flywheels stolen to do this, then George Smith made them for everybody. The only down side is you may use a little more oil. I rode one for years. They are dead reliable...
OK, so there are stroker kits available, such as one from S&S. I have heard that back order is many months. And a person should most definitely read all the cautions in the Sportster Performance book before doing anything. It is not a project for the inexperienced to learn on.

But i thought the originator of this thread is asking about boring to increase displacement for more power. And i think there is no significant gain to be had there.

Last edited by IronMick; 26th January 2009 at 04:35..
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  #15  
Old 25th January 2009
BuckIRyder BuckIRyder is offline
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The biggest bore used on Ironheads I've ever seen is 3.5 inches. At that size, the cases need to be bored and that makes them too thin in the lifter block area. So they have to have a weld build up to allow the boring with adequate margin for case strength. I don't even know if any one is making big bore cylinders for Ironheads any more. A stroker is more practical for the street and would give you a really good seat of the pants power increase.
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  #16  
Old 25th January 2009
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Boys, come on now, let the guy go for it if he wants to. Who knows maybe he's rich. I don't think anyone is making Ironhead cylinders even Axtell. After all I don't want to be the only guy here with a big motor. I think when he finally realizes how hard it will be to get parts and the cost of them, plus the labor he might rethink it all. But I'll tell you this, nothing beats cubic inches.



Here is the welding between the lifters that will need to be done.
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  #17  
Old 25th January 2009
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FDNY,
I want that Motor when you are Ready.........
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I mean't that I'd Love to Buy it.......
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  #18  
Old 25th January 2009
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Do a search on ebay, guy was selling trock big bore iron head cases and starting bid was 500.00. i dont think they sold, maybe he relisted them. Would be a good start to a very expensive project.
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  #19  
Old 25th January 2009
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D & S still sells cases, and STD makes a set as well. The problem is cylinders. Axtell does make custom cylinders, I just had a set of custom cylinders made for a revtech 100" motor last year. I gave some thought to an evo top on an early 'ch bottom. I was going to turn down the spigot of 883 cylinders to the biggest I could bore the cases, and fill the stud holes, redrilling for through studs. The big problem is top end oiling. All evos oil through the pushrods, and there is no easy way to plumb oil to the rockerboxes. It's also just as difficult to put oil through ironhead pushrods. Additionally, EVO top ends grow dramatically, so solid lifters are a bad idea with alloy top ends.

Big bores are superoir to strokers in a number of ways. Especially in a sportster, because they are capable of higher revs. The piston speed increases when you stroke a motor, leading to reduced piston/cylinder life, and lower redline rpms. A big bore is capable of stock-like reliability and redlines. The problem is the difficulty of adapting the cases. Early cases are flimsy and have minimal deck surface. Also a big bore will always breath better, as when you move the cylinder wall away from the valves you unshroud them. Big bore EVOs beat stroked EVOs easily. I'll take a 97" axtell over a 96" S&S any day!
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  #20  
Old 25th January 2009
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Sounds like the Guy needs an EVO, I played with a Buell for 2 years and that bike was fast as a stocker, an Ironhead is a different animal, yes piston speed increases with the long stroke but for the dollar as many stated, the stroker will walk from the big bore Ironhead, a Sportster is a natural stroker anyway and the KH from the factory had a stroke of 4 9/16", that would be 1/16 larger than guys runnin S&S 4 1/2" stroke.
Add to my BS, the Man will pay a small fortune today to have the heads matched to the cylinders, relocating bolt holes, welding the case deck when the stroker using the 1000cc top just would have to be notched for the longer stroke, oil holes in jugs lowered.. there is no cheap way out dude..
How about this:Leave the stock displacement, have the heads Ported, Andrews R5 cams, S&S E carb, lighten the bike by 50 pounds and ride the shit out of it..
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