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Sportster Motorcycle Engine Conversions Advice, questions, and tips for 1200, 1250, 1340, 1450 etc... for Sportster and Buell motorcycle engine conversions

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  #11  
Old 20th November 2004
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Quote:
Originally Posted by gwcrim
1- port the heads
2- add cams
3- Cycle Shack Slip ons

That should get you into the 90s. Call NRHS, Zippers, or Headquarters.

A good 2 into 1 header should add some HP; I would perfer to move slower on a limited budget and get quality. And with the 2 to 1 header he still should have a few bucks for a cam.
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  #12  
Old 20th November 2004
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Quote:
Originally Posted by Narley
Ditto.
do the heads pick up 10 ponies..do the cams maybe 5 more...so the heads are the way to go...do you have the cycle shacks or some other slip ons?
I have the SEII slipons-no baffles
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  #13  
Old 20th November 2004
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I have had my heads done, got Cycle Shacks and a set of cams plus an ignition and got 84HP at 6300. I think 90's is a little high in expectation unless you want to rev a lot higher. I saw a 1200R with 883 heads and 9.5 wisecos with factory cams make 80+ ft lbs at around 3K up to around 4300. I was impressed. Of course its HP #'s were low with the factory cams but the Tq curve was very impressive. This is the dyno from yesturday.
The red curve is with N2's and the green curve is N3's.


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Last edited by barry1967; 21st November 2004 at 01:48..
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  #14  
Old 21st November 2004
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If you get a buyer for the se II ,sell them. The cycle shacks (aka se I) are way cheaper and make more power. I had the bike on the dyno all day with my indy . we ran the se II with no baffles , modified unstruction, cut out little holes, sortened baffle and no bafffle...it was a fun day. the cycle shacks made better results with the baffles in!
I had the hq mild heads at 10.5-1 and the andrews N8 and the cycle shacks and got 83 hp.
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  #15  
Old 21st November 2004
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barry1967,

What kind of head work did you have done?
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  #16  
Old 21st November 2004
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It started with a radial valve job with a little back cut I believe, shrink porting the exhaust side, a lump of aluminum welded into the intake side and then cnc'd to reshape it to increase velocity and I had the springs adjusted for height and lbs. Also took off a few thousand'ths to square em up. Thinner head gasket. Cylinders honed to round and squared as well. About 10 to 1 now.

It cost me 800 for all that but he gave me a bit of a break cause it was the first 04 1200 he did. Normally I think it was a 1000 job.

Her's the link, http://www.johnsonenginetechnology.com/index.html

Last edited by barry1967; 21st November 2004 at 19:35..
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  #17  
Old 21st November 2004
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NOS and some big balls
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  #18  
Old 22nd November 2004
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Yeah , nitrous...thats good for 20 -40 ponies and the kits are only about $800
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Old 22nd November 2004
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children , don't try this at home
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  #20  
Old 25th November 2004
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truth..with your budget..NITROUS
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