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23rd February 2021
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Flat Track Champion
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Join Date: Dec 2014
Posts: 635 Sportster/Buell Model: X1 Sportster/Buell Year: 1999
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Quote:
Originally Posted by cycowrencher
At this kind of compression it wont matter much...
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Nice! Lol
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23rd February 2021
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XL FORUM TEAM MEMBER
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Join Date: May 2009
Location: Pepperell, MA
Posts: 2,807 Sportster/Buell Model: XLH 1200 Sportster/Buell Year: 2003 Other Motorcycle Model: 1984 KX 125
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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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__________________
USN 1991-1995 VFA-81/ USS Saratoga, Iraq 1, Kosovo/ Bosnia Conflict
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23rd February 2021
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Senior Master Custom Bike Builder
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Join Date: May 2010
Location: Pottstown PA.
Posts: 14,509 Sportster/Buell Model: xlch Sportster/Buell Year: 1960
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Quote:
Originally Posted by cycowrencher
Ceramic top and teflon skirt.
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you didn't mention the gas ports in this post. are they common with these pistons?
__________________
72 1000cc barrels and heads, s&s 41/2'' flywheels, sifton cams, s&s super B w/ zippers thunderjet w/yost powertube, andrews gears,and shafts, competition engineering kevlar wet or dry clutch, 72 oil pump, morris magneto w/auto advance and single fire module, cycle electric generator w/electronic regulator,73 cu.in.
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23rd February 2021
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XL FORUM TEAM MEMBER
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Join Date: Feb 2008
Posts: 7,468 Sportster/Buell Model: 883 Xl Sportster/Buell Year: 1992
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Quote:
Originally Posted by cycowrencher
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...
Sent from my LM-V405 using Tapatalk
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Just curious, why the Ti valves if you are shifting at 7600? |
24th February 2021
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XL FORUM TEAM MEMBER
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Join Date: May 2009
Location: Pepperell, MA
Posts: 2,807 Sportster/Buell Model: XLH 1200 Sportster/Buell Year: 2003 Other Motorcycle Model: 1984 KX 125
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Quote:
Originally Posted by madnss
Just curious, why the Ti valves if you are shifting at 7600?
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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; 24th February 2021 at 00:48..
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24th February 2021
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XL FORUM TEAM MEMBER
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Join Date: May 2009
Location: Pepperell, MA
Posts: 2,807 Sportster/Buell Model: XLH 1200 Sportster/Buell Year: 2003 Other Motorcycle Model: 1984 KX 125
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Quote:
Originally Posted by brucstoudt
you didn't mention the gas ports in this post. are they common with these pistons?
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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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24th February 2021
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XL FORUM TEAM MEMBER
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Join Date: Feb 2008
Posts: 7,468 Sportster/Buell Model: 883 Xl Sportster/Buell Year: 1992
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Lets see your off season builds
Quote:
Originally Posted by cycowrencher
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.
Sent from my LM-V405 using Tapatalk
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Nice!! Gonna be in the 9’s soon!
Sent from THEE White House
Last edited by madnss; 24th February 2021 at 01:22..
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24th February 2021
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XL FORUM TEAM MEMBER
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Join Date: May 2009
Location: Pepperell, MA
Posts: 2,807 Sportster/Buell Model: XLH 1200 Sportster/Buell Year: 2003 Other Motorcycle Model: 1984 KX 125
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Quote:
Originally Posted by madnss
Nice!! Gonna be in the 9’s soon!
Sent from THEE White House
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Im hoping on pass 4 of licensing...
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24th February 2021
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Senior Master Custom Bike Builder
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Join Date: May 2010
Location: Pottstown PA.
Posts: 14,509 Sportster/Buell Model: xlch Sportster/Buell Year: 1960
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thanks cycowrencher.
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28th February 2021
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XL FORUM TEAM MEMBER
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Join Date: May 2009
Location: Pepperell, MA
Posts: 2,807 Sportster/Buell Model: XLH 1200 Sportster/Buell Year: 2003 Other Motorcycle Model: 1984 KX 125
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Hows that for a dome.... 320cc...
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