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3rd February 2023
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Biker
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Join Date: Aug 2018
Location: CT
Posts: 18 Sportster/Buell Model: XL883 Sportster/Buell Year: 2005
Reputation: 10
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TC88A and higher compression timing
Hey guys, been a minute but ended up on another Sportster (05 883) and like always I can't leave anything alone.
Have a bunch of parts on the way, 04+ 1200 heads and 03+ Buell XB pistons, cylinders, and cams. Using a 0.030" head gasket so static compression should be around 10.1/2:1 and dynamic just under 9:1 (Buell XB "E" cams are identical to to SE551's) and all the necessary supporting mods
My question is on my last Sportster (04 1200) I used the 35* ignition map and it worked great. I'm getting a ton of different information on how to write a timing table for this engine. Some are saying 28* max, some say 33, and I pulled a stock XB12 map and it has over 40* at 6k+ dialed in (not sure I believe that)
Anyone have a general idea of where to start?
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3rd February 2023
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XL FORUM TEAM MEMBER
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Join Date: Nov 2004
Location: jupiter fl
Posts: 2,946 Sportster/Buell Model: 1200C Sportster/Buell Year: 04
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I have max timing set at 30. No pinging.
__________________
04/07 1275 BFH heads Darkhorse XB crank .600 cams S&S 1.725 rockers S&S precision lifters BDL+15% clutch TC88A HSR-45 S&S 3" ac LSR 2-1
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3rd February 2023
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Senior Chief Harley Engineer
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Join Date: Oct 2019
Posts: 1,054 Sportster/Buell Model: 883 Evo Sportster/Buell Year: 1989
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W/r/t static compression should be around 10.1/2:1 and dynamic just under 9:1
What's the intake closing point? Taken @ what duration?
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3rd February 2023
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Biker
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Join Date: Aug 2018
Location: CT
Posts: 18 Sportster/Buell Model: XL883 Sportster/Buell Year: 2005
Reputation: 10
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Quote:
Originally Posted by kitabel
W/r/t static compression should be around 10.1/2:1 and dynamic just under 9:1
What's the intake closing point? Taken @ what duration?
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Valve timing is:
IN 25/45
EX 59/10 |
4th February 2023
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A Million Facts & Figures
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Join Date: Jan 2005
Location: Famous Potatoes
Posts: 10,456 Sportster/Buell Model: XL883 Sportster/Buell Year: 2007 Sportster/Buell Model #2: Buell Cyclone Sportster/Buell Year #2: 1999
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Quote:
Originally Posted by clark_zrx
Have a bunch of parts on the way, 04+ 1200 heads and 03+ Buell XB pistons, cylinders, and cams.
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Are the pistons XB9 or XB12? |
4th February 2023
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Biker
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Join Date: Aug 2018
Location: CT
Posts: 18 Sportster/Buell Model: XL883 Sportster/Buell Year: 2005
Reputation: 10
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Quote:
Originally Posted by aswracing
are the pistons xb9 or xb12?
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xb12 |
5th February 2023
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A Million Facts & Figures
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Join Date: Jan 2005
Location: Famous Potatoes
Posts: 10,456 Sportster/Buell Model: XL883 Sportster/Buell Year: 2007 Sportster/Buell Model #2: Buell Cyclone Sportster/Buell Year #2: 1999
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Quote:
Originally Posted by clark_zrx
xb12
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You're golden on the pistons.
But the XB's "E" cams are not exactly the same as the SE "E" cams ... same specs, sure, but the marks and the timing cup slot are not the same. Much discussion on here about using them in XL's. |
6th February 2023
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Biker
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Join Date: Aug 2018
Location: CT
Posts: 18 Sportster/Buell Model: XL883 Sportster/Buell Year: 2005
Reputation: 10
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Quote:
Originally Posted by aswracing
You're golden on the pistons.
But the XB's "E" cams are not exactly the same as the SE "E" cams ... same specs, sure, but the marks and the timing cup slot are not the same. Much discussion on here about using them in XL's.
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I know how to install them, I'm just worried about writing a timing curve for the TC88A |
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