Post by matthew j henschel...still trying to get this damn abacus hooked up to the rear wheel. Trick
shit, no doubt.
Any pointers on books or resources regarding head flow theory? I got no
idea of the physics of it except what old bikers tell me, half of which is
probably really good information and perhaps even wisdom. It's the sorting
it all out thing that gets trickey. Weld the ports, enlarge them, polish
them, keep em rough, etc. I gotta make it work for ME, and knowledge is
power. Input accepted.
I've lowered my sights a little. I'm shooting for 80hp outta 74 ci and less
then 10:1 compression with a fairly flat torque curve (ie not all above
4500rpm).
Meanwhile, I'll chase down reoccuring leaks and other assorted fastener
phantoms.
-Matt
With those goals, I'd start by checking with a few cylinder head hotshots. The
guys who do shoveheads are getting harder to find, most being obscured by the
glut of evo and twin cam "experts". I'd call one of the older, established
high performance guys like Dan Baisley or the equivalent. I have no idea if
Dan's doing shovel stuff now, but he'd have some ideas. He's one of the more
knowledgable guys I've talked to on head flow theory. Might also call Barry
Gerolomy.
In general, without having the heads done right, you're going to have a bitch
of a time making a drivable combination. With the combustion chamber design on
a shovel motor, especially at increased compression you fight the battle of
lighting the fuel early enough to complete combustion, while at the same time
trying to avoid detonation. Dual plugging helps, but isn't the complete
answer.
Court Jester
www.CourtJesterRacing.com