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  #21  
Old 11th November 2006
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It does not make any sence that a 4 valve head can only make 10hp more... heres a guy that made just a little bit more...

97ci, 16.1 comp...160hp
http://www.et-performance.com/iron_mag.html


Also theres more issues with high compression, 12.1+ and detonation with the 2 valve design on pump gas. Most all 4 valve bikes are running a 12.1+ comp on pump gas with a lot less ping issues. I think I would have less problems running a 4 valve 12.1+ compression head on pump gas on my xl engine.
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  #22  
Old 11th November 2006
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The biggest limiting factor on H-D V-twins is they can not be spun fast enough to use huge port flow. They simply were not designed for this back in the 50's. This is why 600cc (36 inch) Jap bikes make 110+ hp at the tire and go 160 mph right off the showroom floor. Super-short strokes and incredibly lightweight valvetrain keep it together at 15,000 rpm - and nearly useless torque below 5,000 rpm. The V-Rod uses modern technology to close that gap between high-rev, 4 cylinder machines and the torky V-twin.
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  #23  
Old 11th November 2006
DC in PHX DC in PHX is offline
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Since you are paying, I think totally cool. Keep us posted, love to see pics of those heads and rocker boxes.
DC
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  #24  
Old 11th November 2006
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quote "Its your money to spend and I hope you get what you want".

rottenralph, I did not mean to come across as an a-hole to you (although my wife keeps on inforcing that fact) with my comments. I just see it happen so many times with people complaining/making an issue of cost... cost ...COST of everything, I am not saying it's not a valid one but thinking that way... fricken hell then... everything in my life has been a waste of money that I will NEVER be able to get back, why did I even buy 2 new pos Buells so I could just loose my money/shirt on they if I wanted to sell, my cars/mustangs/351C engines... same thing, never mind the rest of my lost cause hobbys. I just don't want to think about if its worth it or not... my advise... if you want it... don't think... work more and you will have it if you really want it... screw the rest... is it worth it???...when I am dead the I will never have to worry about it again.


If that dam 97" evo can make 160hp at 6000rpm with 4valve heads then damit, why can't an XL. The big $4400 question is still, is there any reason the 3.7/8 arao heads can't be made to work on an xl.
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  #25  
Old 11th November 2006
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Maybe you can get them to do the fitment for free as an experiment of sorts. You pay for the heads, they do the r&d using your bike and then you get to ride the beast.
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Spoiled but definitely not rotten. Started life as a black 1993, 1200 Now-1218, Home ported 2009 FI heads, Andrews N6 cams, Dyna2Ki, JMC aluminum swingarm, Chainsikle custom mid forward controls, GBC inverted front end, 3 degree wide-glide trees and 5 degree raked cups. 18x3.5 fatspoke rear with 150/60 and 21x3.5 with 120/70.
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  #26  
Old 12th November 2006
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Thats a good idea... but now I am wondering if 4valve evo heads would be easyer to modify to use on an xl?.
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  #27  
Old 14th November 2006
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Man I hate this e-bay thing, found at set of 4v heads to test/try out. The first time I ever tryed this e bay thing I get screwed over/snyped? by a a hole that bids 10 bucks more 4 seconds before the auction ends and when I tryed to put another bid in it wouldint work. They claim it's "part of the experience of ebay" lol. Something stinks in the way they do business. I guess I have to learn to be a crook to bid in that poop hole.

I was willing to go to $1500 and I end up loosing the auction for 10 bucks??? lol???

http://cgi.ebay.com/ebaymotors/ws/eB...8557&rd=1&rd=1
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  #28  
Old 14th November 2006
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If you were willing to go to $1500, you should have put that in as your max bid and let eBay do the rest. You would own the heads right now.

But, I think you are the winner here. Those are the heads I hate so much What a convoluted, complicated way to make horsepower. There are so many more good ways to do it now, without limiting yourself to the components that work with these heads. Plus, these are used BT heads I think, so you'd have to make them work anyway. I understand enjoying the challenge of making these work, but it's sure a lot of work for little benefit.

I also wonder why they were taken off the bike...

--Chris
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  #29  
Old 14th November 2006
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I those heads are for a BT I doubt the intake plenum would fit installed on a Sportster.
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  #30  
Old 14th November 2006
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Yup, my mistake lol, I just thought it would be silly to start with puting a 1500 bid in when the next highest was 450... oh well... live and learn, there will be others. Another silly thing about all this is I found another set before that sold for $275. lol I'm willing to bet the heads came off the BT because they did not work well lol. Modding things to fit never scared me, done it many times with many things. Some of us just want to go left when everyones going right.
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