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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 13th March 2010
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Ferrous Head Ferrous Head is offline
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Quote:
Originally Posted by Stephen Lowry View Post
Can't wait to see the pics. I truely love stuff like this. I'm trying to put together a evo style XL stroker ( 4.125 x 4.00 = 106.9" ) motor to run in AHRMA pro twins formula 1 to beat a 100 inch Vincent. I need 170-180 rwhp. I'm gonna use STD XR style max effort heads and S&S cases. I need all the info I can get from the present and past to get this done.
Goliath, now that was some race bike. it's bikes like that, that give me hope. all info and help is appreciated. This is gonna be a titanic efffort. We are all XL extremist!!!!!!!!!!
Thank You very much ..................steve
The biggest problem I see is the cases themselves. STD don't make them anymore so you need to find a set from somewhere. One other possibility is John Trease in Melbourne Australia. John is well known here for is "Race cases" for big twins. John has made a set of Sportster cases for the bike he runs in Period 3 here and it runs away from EVERYTHING ! Holds the lap record at Phillip Island and outruns nearly all of the Period 4 bikes, it's that fast. I spoke to John a couple years ago and he has the patterns but wanted $5k at the time for a set of finished cases. I am now considering getting in touch and ponying up the money if he will still do them.
Unless of course someone else now has a source of race cases for Sportsters.
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  #52  
Old 13th March 2010
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It really depends what you would like to use the engine for. Stroking is easiest most inexpensive way to get a awesome street engine. Long stroke is costly and alot of work though. Large bore is costly tons of work but obviously better for high RPM. Xr style heads work great with either way you go. Why not do all three if you are capable and/or can afford to have the work done. There is a company selling Complete XR style heads on Ebay: $3500.00 would need custom cylinders,pistons,intakes,carbs,exhaust,pushrods,c ams, never mind the case work,crank scrapers,ect. Any thing can be done with MONEY.... I would say $10,000 would build you a nice setup. Worth it?
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  #53  
Old 13th March 2010
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Quote:
Originally Posted by chevelle View Post
It really depends what you would like to use the engine for. Stroking is easiest most inexpensive way to get a awesome street engine. Long stroke is costly and alot of work though. Large bore is costly tons of work but obviously better for high RPM. Xr style heads work great with either way you go. Why not do all three if you are capable and/or can afford to have the work done. There is a company selling Complete XR style heads on Ebay: $3500.00 would need custom cylinders,pistons,intakes,carbs,exhaust,pushrods,c ams, never mind the case work,crank scrapers,ect. Any thing can be done with MONEY.... I would say $10,000 would build you a nice setup. Worth it?
FOR THAT KIND OF MONEY
I would buy a Zuki Hayabusa before I spent that kinda money. That way I would have 2 reliable bikes to ride. But what ever floats your boat. Make sure you take pics either way.
Larry
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  #54  
Old 12th May 2010
tom gordon tom gordon is offline
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hyperformance will make you big bore cylinders,any bore you want 515-266-6381, i bought a set,$1000 just for the cylinders.IHTOM
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  #55  
Old 1 Week Ago
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Default Late for the Party .. !!

Well, better late then never ...

Bringing this thread back from a 10 year nap with a new project that happen to jump in my lap ...

A little tidbit of the back story: .. Did some horse trading a while back and came up with a 1974 CH, bone stock as they come, been took apart for paint and forgot about ...

My plan was to build it back to it's glory days since all the Oem parts was there to do so...
Well after a few years sitting in the floor of my shop and very little work going down on the Sportie, I sold it to a friend ...

He wanted to go through the motor in order to make sure it was up to snuff.
Pulled it down to bare bone and found only a Heavy-Duty rear motor mount, all other parts was Oem ...

Now this old boy was somewhat of a gear head and wanted to up the cubes a bit ...
So we bought a set of T&O 4-5/8" stroke flywheels for the critter ...



Our aim was to get a new set of Trock-Cycle 3-7/16" bore jugs ..
86 cubes here we come ...

... But ....

It just so happened that a deal jumped up and bit me on the ass ...

Ran up on a set of NOS Poole Shovster jugs ...





Now a new game plan is afoot .. !!

Maybe a Panster, not all that sure what heads he will be adding into the soup ...



In another trade came up with a 1980 XLH motorcase that has already been bored for running 3-7/16" jugs ...



No beefing up the deck area was done on em ....

On the 74 CH that is going together, mega work will be done for adding deck meat ...
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  #56  
Old 1 Week Ago
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BTW ...

The 80 case will not be needed and I got it for sale along with it's matching Cam Cover ...





(In real good condition with no repairs seen, shoot if I hadn't already started building the 74 CH, I would be building the 80 motor)



A super nice cut down job was done to it ...





Been converted to Torrington needle bearings and both the motorcase & cam cover seen a very nice polish job ...
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  #57  
Old 1 Week Ago
1Scooter 1Scooter is online now
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Best Big Bore ya can get is .070 oversize pistons. NOBODY make a big bore kit for 1957-1985 IRONHEAD Sportsters. Ya want Big Bore . . . start with an EVO Sportster.
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  #58  
Old 1 Week Ago
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Quote:
Originally Posted by 1Scooter View Post

NOBODY makes a big bore kit for 1957-1985 IRONHEAD Sportsters.

Wonder if Ronnie Trock knows that ... ??


eBay item number:252458207927

These are 3-5/8" bore Sportster cylinders. They are the tallest Sporty cylinders I have ever made. They are 6.250" tall. The fire ring on top is 3.750" dia by .125" tall. The bottom spigots are 3.780" dia by 1.050" long. I made the root depth of the fins .100" larger diameter than usual, so these have extra strength for racing. These cylinders have the Trock bolt pattern on top and have the stock 1000cc bolt pattern on the bottom. Your heads and cases need to be modified to use these. As always, Trock cylinders are made from 80,000 lb. tensile strength ductile iron. Other bores, lengths, and bolt patterns are available. Call Ron Trock (jr.) at 847-683-4010 afternoons and evenings Chicago time for any questions.
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  #59  
Old 1 Week Ago
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Ferrous Head Ferrous Head is offline
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I did ask him about the possibility of making some slightly bigger 900 case bolt pattern cylinders. But not going to happen.
The last batch new stock cylinders I bought weren't even cast correctly. Pretty sure they cam from India or China. Suspect they are made from compressed belly button lint.

Flathead Power will make anything you want in ductile iron - all you need is the money. It's just that you need a LOT of that.

There are still a few sets of Axtell and Dytch cylinders floating around but getting much harder to come across these days.

I'm not sure why because nobody (apart from me) really races these things anymore.
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  #60  
Old 6 Days Ago
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Made slight progress on the Big Bore 74 CH ..



Cam Bushings was a bit worn-out ... Starting off back to tight specs ..





Using a blind hole puller got all the old bushings out ...



Decided where the staking was going to go ..



Nailed those bad-boys down for the long run ..



After line reaming all the bushings including the pinion bushing, a spin test was done using the Oem cams ...

We have our sights set on a set of these bump-sticks ...



Leineweber L-6 grind is sitting in a box with my name on it, ready to be shipped out as soon as I send the money ...

Hadn't did any work on the motor case just yet, going to weld in a plate on the left side and filler weld on the right side ...
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