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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 26th June 2009
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jessearias jessearias is offline
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Default answers

Grind,

To answer your questions. The Buell XB/1200R heads are the best production sportster heads to date. In the NRHS section, there is a nice write up on all the sportster heads.

As for cams, depends on how hot you want to go. In stock form, they will handle SE-497 or SE-536 cams with no modifications. Both are great street cams.

A lot of people on this forum like Mr. T, Terp1984Alum, myself and others have made over 90 HP with STOCK Thunderstorm heads so, the HP potential with the new heads is even greater.
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2002 XL1200S "The Black Beauty" NRHS 1250 kit CI, NRHS Stage 1 TS heads dual plugged, NRHS Hurricane Air Filter, SE 536 cams, Rich Products Thunder header, 42 Mikuni, Daytona Twin Tec ignition w/ Dyna coils. 97.4 HP, 85.5 Torque 1984 XR-1000 S&S Crank/rods w/windage tray, Vision Grinding Cylinders, Arias 11:1 compression pistons, Andrews XR-1000-1 cams, Baisley modified dual plugged heads, Rich Products Thunder header, 38mm Delortos, Daytona Twin Tec ignition w/ Dyna coils. (the never ending project but, got a 66 Barracuda drag car sucking up all the funds and time)
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  #12  
Old 26th June 2009
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drummerboy4as drummerboy4as is offline
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Originally Posted by Bob F View Post
Dyno it yet? How had is it to keep the front wheel on the ground? Don't be a pic tease.
No I haven't had much luck in finding a decent place to get it done. I really need to though, just to make sure my carb tuning is correct.

If I get on it hard in first I can pull the front end up, I try not too though cause I get sick of changing my pants If I do about 35 in second rev to 5k and pop the clutch it'll come up too.

Lot's of good pics of the engine pieces and other goodies in the link in my sig.




I've since added clip-ons, bar end mirrors, a Licks Solo bag and lowered the headlight. I'll have to take more pics when I find a good location

Back to the engine setup goodies
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"Take most people, they're crazy about cars. They worry if they get a little scratch on them, and they're always talking about how many miles they get to a gallon, and if they get a brand-new car already they start thinking about trading it in for one that's even newer. I don't even like old cars. I mean they don't even interest me. I'd rather have a goddam horse. A horse is at least human, for God's sake." ~ Holden Caulfield

[URL="http://xlforum.net/forums/showthread.php?threadid=175003"]Link to my NRHS build thread[/URL]

Have wrapped exhaust? [URL="http://xlforum.net/forums/showthread.php?t=544763"]Please read[/URL]
[QUOTE=khaskins;2765309]"my bike scares the cars and they scream like little girls"[/QUOTE]
[QUOTE=rottenralph;1773182]Bees and balls don't mix.[/QUOTE]
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  #13  
Old 26th June 2009
XLdaveR XLdaveR is offline
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Hey DrummerBoy, your bike looks sweet !
I've been waiting for you to Dyno your bike, I'm going to be using the same cam/pipe combo when I rebuild my top end. Just gathering parts at the moment, got the cams, hurricane valve, manley springs, high comp forgies so it'll be very similar to yours. I reckon you would be in the mid 90's, if not more
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  #14  
Old 27th June 2009
grindbastard's Avatar
grindbastard grindbastard is offline
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Quote:
Originally Posted by jessearias View Post
Grind,

To answer your questions. The Buell XB/1200R heads are the best production sportster heads to date. In the NRHS section, there is a nice write up on all the sportster heads.

As for cams, depends on how hot you want to go. In stock form, they will handle SE-497 or SE-536 cams with no modifications. Both are great street cams.

A lot of people on this forum like Mr. T, Terp1984Alum, myself and others have made over 90 HP with STOCK Thunderstorm heads so, the HP potential with the new heads is even greater.
Thanks for the info. So are the Buell XB/1200R heads the same animal as the Thunderstorm heads you guys are running? (This is all new to me.)

90HP? Damn. With what additional modifications? Stage 1, cams, and...?
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2005 XL1200R - Arlen Ness Big Sucker AC, Cycle-Shack slip-ons, #185 Main/#45 Pilot, DynaTek Dyna 2000 Ignition, Forward Controls, 12" air shocks
2005 XL1200C - Stock as F*#k.
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  #15  
Old 27th June 2009
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drummerboy4as drummerboy4as is offline
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Originally Posted by XLdaveR View Post
Hey DrummerBoy, your bike looks sweet !
I've been waiting for you to Dyno your bike, I'm going to be using the same cam/pipe combo when I rebuild my top end. Just gathering parts at the moment, got the cams, hurricane valve, manley springs, high comp forgies so it'll be very similar to yours. I reckon you would be in the mid 90's, if not more
Thanks! I've been procrastinating on the dyno, I really need to get it done I've just been spending money on suspension and other modifications.

With a proper tune I hope to make at least 100 horse. It's sort of what I was shooting for with the build. Had I know better I would have done a couple things differently that would make the century mark easier. I guess I'll get off my duff and get a dyno

Are you getting jugs from NRHS or having yours bored out? What size?

Quote:
Originally Posted by grindbastard View Post
Thanks for the info. So are the Buell XB/1200R heads the same animal as the Thunderstorm heads you guys are running? (This is all new to me.)

90HP? Damn. With what additional modifications? Stage 1, cams, and...?
No, the Thunderstorm heads are specifically Buell heads. I don't know a lot about them except they have a cast in angled squish band which, from what I understand, is usually inaccurate. They can be machined to be pretty good heads, but that's about all I know.
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  #16  
Old 28th June 2009
XLdaveR XLdaveR is offline
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Originally Posted by drummerboy4as View Post
Thanks! I've been procrastinating on the dyno, I really need to get it done I've just been spending money on suspension and other modifications.

With a proper tune I hope to make at least 100 horse. It's sort of what I was shooting for with the build. Had I know better I would have done a couple things differently that would make the century mark easier. I guess I'll get off my duff and get a dyno

Are you getting jugs from NRHS or having yours bored out? What size?
What exactly would you have done different, looks like you've got all the best parts already?
Going to rebore my cylinders and use Wiseco 10.5-1 +.020 pistons. 1214cc
I'm shooting for 100HP also, I think the Bub 2-1 pipe is as good as any and doesn't hang as low as many others do. I'm going to experiment with different baffles to get the best power spread also, I don't mind sacrificing a little on top for a bit more mid range
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  #17  
Old 28th June 2009
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Quote:
I've been procrastinating on the dyno, I really need to get it done I've just been spending money on suspension and other modifications.
You'll gain power with a "good" Dyno tune. How's your brakes? I'm enjoying reading this thread, have some rep on Bob.
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  #18  
Old 28th June 2009
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drummerboy4as drummerboy4as is offline
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Quote:
Originally Posted by XLdaveR View Post
What exactly would you have done different, looks like you've got all the best parts already?
Going to rebore my cylinders and use Wiseco 10.5-1 +.020 pistons. 1214cc
I'm shooting for 100HP also, I think the Bub 2-1 pipe is as good as any and doesn't hang as low as many others do. I'm going to experiment with different baffles to get the best power spread also, I don't mind sacrificing a little on top for a bit more mid range
Not a whole lot. I would've got an angled squish band and some pop up pistons to help with the burn and it sort of directs exhaust gasses out better. I would probably figure out what size pushrods I need and get a fixed length. I can still do this, while I'm at it I may get different lifters. I'd have to weigh the $ vs whether I REALLY need them

I haven't looked around much, but I don't know of many different baffles for the Rinehart. If you want real tunability go with the Supertrapp 2-1. They sound great too.

Quote:
Originally Posted by Bob F View Post
You'll gain power with a "good" Dyno tune. How's your brakes? I'm enjoying reading this thread, have some rep on Bob.
I recently upgraded to the 4 pot Vrod brembo caliper and floating rotor setup in the front so she stops pretty well

Didn't mean to hijack your thread there jesse
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  #19  
Old 28th June 2009
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misterT misterT is offline
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Quote:
Originally Posted by sig061 View Post
Thinking about getting the NRHS Hurricane air cleaner. Vance & Hines 2-1 competition pipes. (Black of course) Leaning towards Fuelpak. What are your cam recommendations? What recommendations at all? Thanks.
The Vance & Hines 2-1 does look really good but the jury is till out on it, many of their pipes have mediocre performance gains. A better choice would be a Supertrapp 2-1, fatcat 2-1, or RB racing 2-1. You can add the SE497 cams without any head work or clearencing your pistons. The SE 537 cams will give you some more top end but require 10.5-1 pistons and careful measurement of clearences. A better ignition like the TC88A with Turbotas map mod 33 will add a few more HP. a MIkuni HSR42 for carb models, and rejetting or the SERT with a dyno tune for EFI bikes is a must. The PSIII is also considered a good fueler for EFI as well.
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04 1200R 90+HP/10.5-1 SE pistons/.536 cams/Heads by MR T/mikuni HSR 42 w/25 pilot, 96 needle, 170 main/TC88A ignition w turbotas mod 33 map pos.4/ Supertrapp 2-1 w 23 disks/ 28T FRONT PULLEY /NRHS Hurricane A/C & adj. pushrods /progressive 440 shocks & fork springs w/10 OZ SE fork oil
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  #20  
Old 28th June 2009
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jessearias jessearias is offline
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Default Listen to the T man

Listen to Mr T. He has one of the proven combinations that work.

Look at his parts combo and learn grasshopper.
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