| Author | Message | ||
     Tony87 |
Hi! It is winter in Norway and i am doing some work on my buell s1 lightning 1998. Is it possible to run xb9 pistons in the s1 to Get some higher compression? And will it gain more hp? | ||
| Phelan |
Because of the dome in the center of the XB9 pistons, you would have to use the XB heads as well (or '04-up XL1200 heads), but you would be looking at 12:1 compression, which is really too high for even 91 Octane fuel. | ||
| Tony87 |
We got 98 octane in Norway. but the "dome" in the xb9 pistons do not fit / clearance in stock s1 lightning heads? Thats why i have to use xb heads? | ||
| Phelan |
Correct. The dome is high and in the shape of the bathtub of the XB heads. Even if you ground out material to make clearance for them in the lightning or T storm heads (whichever you have), both have a 15* squish cast in them that would collect fuel cut off from the flame front, and it would cause hot spots on the piston when those areas do ignite, eventually causing piston melting. | ||
| Tony87 |
OK Thnx | ||
| Dannybuell |
I understood that the lightning heads used flat top pistons, like the xb. the domed pistons are the thunderstorm heads. | ||
| Phelan |
Motors with Lightning heads did use flat top pistons but the heads have a cast squish band in them. Same heads as the '98-'03 XL1200S and pre-'04 Screamin Eagle heads, though the 1200S and SE variants are dual plugged. |
