I would like to hear you're bike run......Theres a vid on youtube of a fatboy lo with a thunder header 103" upgrade and cam and it sounds sick...

 

Oh yeah!! Did Gerolamy do the head work?

Not trying to hijack this thread...

 

ok thanks guys my bike idles at 950 when it is warm it sound ok with the 203's but there has to be something a guy can do to get these things to be lumpier with out going to a 103 etc.What is the advantage of the 4 deg key.

 

It moves the power band to the left, earlier, a few hundred rpm. Builds up a little more compression sooner then not using a key.

Have read that some tuners allow you to drop the idle rpm. Some say not a good idea because it drops the oil pressure. I do not claim to know either way - just sharing what I read.

imo - ride it and enjoy it. Cant hear the idle when youre rolling down the road.

 

There is nothing you can do to get the sound I think you are looking for. Just ride it and be happy or get an older shovel.
A bigger cam might give you a rougher idle but it will also move your power band to the upper RPM level and lower the fuel mileage.
1000 RPM is the normal idle range to keep the oil pressure up and the engine cool.
I think you are looking for the impossible.

Look on youtube and listen to some of the engines running.

 

The Andrews 48H and 54H work with stock springs, good low end power and mid range power and produce a nice thump with stock compression.

 

On my 06 SB I went from the 88 to 95 inch with 10.25 to 1 pistons. Shopping cams I opted of Fueling 574 cams and race roller lifters. Heads I picked out were ported/polished, flow tested with larger valves and heavy duty/high lift springs. Baffle I used are BCT Monster Baffles.

At idle it is plenty "lumpy" and you know it isn't stock....Looks stock though.

Give Fueling a call and chat for a bit, great people and they will point you in hte right direction even if it isn't they cams.

Karsten

 

Not sure, dont think 48 and 54 will work with his 04 heads. Those are higher lift cams. And he may need to do the cam plate conversion and 48N cam.