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Author Topic: 1000cc MPG or A/PG questions for WOS  (Read 1596 times)
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Unforgiven
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« on: October 07, 2017, 10:24:35 PM »

Just trying to learn the basics to get me started. From what I see, an 883 punched to 1000cc would go in Modified Production Gas 1000cc class. Now the question I have, would a hardtail put on a 2006 rubbermount qualify it as A (special construction) Thanks for your time and answers.  Ed
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Stainless1
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« Reply #1 on: October 07, 2017, 10:33:30 PM »

Ed, get a rule book... I don't think just adding a hardtail will put you in A..... did I mention get a rule book  wink Buy one now, don't wait for the new one.... it will be March or so.
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Stainless
Red Hat 228.039, 2001, 65ci, MSA Bockscar Lakester with a little N20 
MSA Bockscar Lakester #1000 my fastest mile 245 and change, 84 ci turbobusa motor... but Corey's 233 MPH H/BFL record is still 3MPH faster than mine.
mtiberio
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« Reply #2 on: October 08, 2017, 07:35:34 AM »

Hardtail via struts, or welded on frame?
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Unforgiven
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« Reply #3 on: October 08, 2017, 10:48:55 AM »

Ed, get a rule book... I don't think just adding a hardtail will put you in A..... did I mention get a rule book  wink Buy one now, don't wait for the new one.... it will be March or so.


Ordering rulebook tomorrow. Thanks man.
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Unforgiven
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« Reply #4 on: October 08, 2017, 10:51:53 AM »

Hardtail via struts, or welded on frame?

Wanted to weld on a hard tail that will increase wheel base. I'm sorta partial to the lines of a motorcycle and like to keep the flow of the line instead of just adding a longer swing arm with steel struts.
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Dakin Engineering
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« Reply #5 on: October 08, 2017, 05:07:11 PM »

Personally, I'm going from struts to shocks.
The Salt is getting to rough for a hardtail.

Sam
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Unforgiven
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« Reply #6 on: October 08, 2017, 08:34:17 PM »

I am looking at most likely putting together a modified production Sportster together for the 1000cc class, but I am still cyphering on a A build with a turbo. Just more stuff I have to gather up for that. Either way they both look attainable.
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Freud
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« Reply #7 on: October 09, 2017, 11:30:46 AM »

Start with the simplest one.

FREUD
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Unforgiven
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« Reply #8 on: October 09, 2017, 01:55:57 PM »

Modified looks simpler than a turbo and fuel injection, since I can't find anyone that has made a carb/turbo combo on a sportster work very well, yet.
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55chevr
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« Reply #9 on: October 09, 2017, 06:43:47 PM »

An 883 won't make a very efficient 1000cc LSR engine.  I suggest you use an XB9 Buell engine.  Much better bore/stroke ratio.
Joe
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Stan Back
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« Reply #10 on: October 09, 2017, 08:15:31 PM »

He's been racing Sportsters for 40 years and's got "a pile of parts".  Probly should give them a try first and see what he likes.  Maybe put a green seat on it or change the headlight -- I don't really know the multitude of bike classes (and it shows!).

Stan
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Unforgiven
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« Reply #11 on: October 09, 2017, 09:35:19 PM »

An 883 won't make a very efficient 1000cc LSR engine.  I suggest you use an XB9 Buell engine.  Much better bore/stroke ratio.
Joe

Was thinking like you, but am considering dropping an xb9 rotating assembly in a rubbermount case (think it is a drop in-gotta check ) use some buell xb12 cylinders have a few sets of 06 heads either or 1200 or xb12.  Buell and sportsters are basically the same engine, except the buell's got the hp stuff. Cranks are lighter versus heavier. Thanks for thinking like me. I am trying to do this as cheap as possible so the pile of parts will come in handy. All I have are rubbermount bikes and parts to pick from right now. Little heavier than the older bikes, but way mobetta built.  The only difference in the rubber 883 and 1200's are piston size, and heads. They all use the same crank and rods, and even the same cylinders (cept different colors) until 08. Everything I have is excellent used or new, so modified looks the cheapest and simplest. Now I gotta figure out how to make it go 150 something. The swap will put me at 984cc and it will rev way higher.
« Last Edit: October 09, 2017, 09:46:05 PM by Unforgiven » Logged
Unforgiven
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« Reply #12 on: October 09, 2017, 09:42:52 PM »

He's been racing Sportsters for 40 years and's got "a pile of parts".  Probly should give them a try first and see what he likes.  Maybe put a green seat on it or change the headlight -- I don't really know the multitude of bike classes (and it shows!).

Stan

You have a sense of humor, that's way better than knowledge sometimes. Modified, I am basically assuming as stated can or must be production modified. So. dropping a xb9 crank with some decent pistons in a 06 with xb12 cylinders and 06 1200 heads (modified production of course) would get her in modified production. Nahlin and a couple guys did a rigid 883 to 1000 years ago and set the record. But they did it with custom pistons and crank etc. Cheaper nowadays. Anyway that little swap puts the engine at a higher revving 984cc. And cheap to do. And way simple. I like your thinking too; But green on a bike is bad luck. Maybe no seat ?
« Last Edit: October 09, 2017, 10:28:58 PM by Unforgiven » Logged
55chevr
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« Reply #13 on: October 09, 2017, 10:13:25 PM »

I put an XB9 engine in an iron head Sportster frame ... I am sure a rubber mount wouldn't be impossible.   On any rough surface a rigid bike will drive your ax hole up through your shoulder blades. I converted a rigid drag frame to swing arm because the uneven surface kept unloading the rear tire plus the shake was jarring.  Think this out carefully.  Do it right the first time. 

Joe
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Unforgiven
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« Reply #14 on: October 09, 2017, 10:26:27 PM »

I don't have a complete engine. The XB9 crank is new in the box. I would like to have the better gearing of the xb9. The pile of parts yielded up enough to get started. I still have to consider how to build it. The record Nahlin helped with back in 2001 was a P-PP build on a rigid mount 883. Took it out to 1000. Either P-PP or Modified production looks the simplest and cheapest. I have a friend that does this land speed stuff with Buells and sportsters..
« Last Edit: October 11, 2017, 12:13:32 PM by Unforgiven » Logged
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