My car seems to idle awful low when
it is warmeed up.. is this normal?

 

with a stock cam idling about 500-600 rpm's when warm is normal.


Are you lower than that?

 

Thats bout where I am.. I guess
I guess I just thought it shoulda
been higher.. plus.. when its idling
that low.. I cant hear the rumble of my
exhaust darnit.. hehe

hey tpi_roc, do you know what cam would give a little bit of a lopey idle, and make my car more "heard" when idling.. and work with my stock computer without any programming?

actually.. anyone who can answer that thats kewl.. I just rebounded on him since hes one of the gurus that answers a lot of post.. hehe

 

On a 305 I'd say around 220 duratoin, 112lsa, and maybe 450-460 lift should give an audiable tone and should work with your ecm.

But just keep in mind that "lope" has its expences, like torque and gas mileage.

 

I would lose torque?
bad?
so where does it gain.. in the higher rpm range?

 

Yes

The function of duration is overlap, basically your incoming charge of air through your intake runner will loose momentum due to both valves being simultaniously open. However, at higher rpms this time period of overlap is shortened quite a bit and has less negative effects or "reverb" up the intake track, in fact it makes more power due to the momentum being carried forth and the exhaust pulse pulling the next intake pulse into the chamber.


This is how huge cars with huge engines and huge duration breath fire

 

(that choppy lopey idle is from a lack of vacuum do to the reverb from overlap at low rpms)