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Sportster Motorcycle Drag Racing Discuss drag racing on a Sportster Motorcycle.

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  #1601  
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Tinz Tinz is offline
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At this kind of compression it wont matter much...



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Nice! Lol


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  #1602  
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There is a GRC crank service and Carrillo rods in my future... As well as Ti valves so I can spin 8500 plus.... I'll be setting the limiter at 7900 and the shift light at 7600...

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  #1603  
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Ceramic top and teflon skirt.

you didn't mention the gas ports in this post. are they common with these pistons?
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  #1604  
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Originally Posted by cycowrencher View Post
There is a GRC crank service and Carrillo rods in my future... As well as Ti valves so I can spin 8500 plus.... I'll be setting the limiter at 7900 and the shift light at 7600...

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Just curious, why the Ti valves if you are shifting at 7600?
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  #1605  
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Just curious, why the Ti valves if you are shifting at 7600?
I'm setting the light for 7600. I average about another 200rpm for the shift, and should be shifted at 78ish... The Ti valves will be next year so I can shift @ 8500...it should make power to there. I have SS valves in it now, and they are too heavy to shift that high. If I can get it to a dyno, I'm betting that when the limiter hits at 7900 the power will still be climbing with that compression and those cams... My engine guy went with some pretty hot triple valve springs just to get to 8k. He does a lot of work for Ryan T. , so Im trusting his judgment.

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Last edited by cycowrencher; 2 Days Ago at 01:48..
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you didn't mention the gas ports in this post. are they common with these pistons?
These are a set of custom CP bullet series pistons that were originally ordered by Rat Racing for a project in 2017. Those ports are in the oil ring for oil scraping. Gas ports are usually through the crown into the top of the upper ring land. I bought them to step up the power since the turbo and custom efi was going to be more than my budget... I may still go down that road later, but this was cheaper and easier...

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Originally Posted by cycowrencher View Post
I'm setting the light for 7600. I average about another 200rpm for the shift, and should be shifted at 78ish... The Ti valves will be next year so I can shift @ 8500...it should make power to there. I have SS valves in it now, and they are too heavy to shift that high. If I can get it to a dyno, I'm betting that when the limiter hits at 7900 the power will still be climbing with that compression and those cams... My engine guy went with some pretty hot triple valve springs just to get to 8k. He does a lot of work for Ryan T. , so Im trusting his judgment.

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Nice!! Gonna be in the 9’s soon!


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  #1608  
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Nice!! Gonna be in the 9’s soon!


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Im hoping on pass 4 of licensing...

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  #1609  
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thanks cycowrencher.
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