Was suggested by tech(s) who installed a Woods TW-555 cam into my 2011 FLHRC to think about doing a 4 degree advance timing gear then dyno tune, I'm currently running with a Dynojet PV tuner with an updated map from Fuel Moto for the new cam install, was also told it's a gamble when advancing the timing?

any gains by doing this? pros/cons ??

 

is the bike falling short on something? 9.6:1 compression has it's limits.....

 

To add to Fritz's comments, if it was my bike I would want to do head work with a bump in compression before messing with the gears......

Just my $0.02

 

The 4 degree gear will normally move the torque band down about 200-300 rpm.

 

It depends. Fuel Moto posted up some dyno charts last year shoing the TW6 cams don't really respond to the +4 gears, and the 555 cam is close enough to the 6 that you could reasonable expect a similar result. (the folks predicting a shift to the left in the torque curve were wrong). The only way of knowing is to install and tune it, and compare it against the build without the +4 gear.

Advancing the intake timing to boost corrected compression is the desired effect, but 4 degrees really only can do so much, and your exhaust valve timing is going to be coming along for the ride, too. If you open the exhaust valve too early, any potential gains you'd be getting from the very, very slight compression bump would just be going down the pipe. People get focused on intake close, but ignore the rest of the timing events.

The fact is, there's just no way of knowing if you'll get anything at all from it until you try in the specific application. Maybe. Maybe no change at all.

 

that's exactly what the tech was trying to explain to me but in a different kind of confusing way (to me anyways),
by reading your explanation is easier to comprehend, thus explaining 'a gamble' ... thanx !

 

You'd be better off installing an Andrews 48..................

 

Before I ever started messing with advancing or retarding a cam I'd be checking the timing to verify where you're really at to begin with.

With all of the cam threads on this forum, one thing I've never heard mentioned, is degreeing the cam. Back in my old car days, degreeing cams was the norm. From what I'm reading today on HDs, that doesn't seem to be the case.

There's no other way to know what the tolerance stack-ups are really doing to your cam timing.

 

...or, if you have your heart set on a Wood's cam, the TW-5-6.