I know it's the cam, but what's actually happening in an engine that makes the specific sound?

Just curious.

Thanks.

 

usually it's valve overlap....when both the intake and exhaust valves are open at the same time....it has to do with longer duration camshafts...

typically you give up idle quality and low rpm quality for the engine to make power more efficiently somewhere else in the RPM band...ie....usually higher up.

 

i would take that sound over any 4cyl with a blow off valve any day.

 

 

you could make a honda lope.


just rig the VTEC silinoid so that its running off the big cam at low RPM...

 

this guy i used to work with at pepboys has a 1990 or 91 eagel (sp) talon tsi awd and he's pushin about 500+ hp and the cams he has in it , it lopes like a ****, im sorry to say but it actually sounds good for a 4 banger but he's also pushin like 25-30 lbs of boost on pump gas and about 42-44 lbs on race gas.

 

Whoa now....44lbs of boost? I think not.

 

actually yeah he runs 44 lbs of boost. there isnt anything stock in the motor, the turbo is bigger then youyr head

 

I'm sure that possible... remember, he said race gas.

And yea, its overlap that causes that sound, but solid lifters add a nice sound to that lope too

 

the 1500hp blown alcohol big block in our race truck has about 25lbs at maximum boost, granted its waaaaay more volume...just to put things in perspective though

 

44psi of boost can mean anything.. The guys who run the honda race shop near my shop run 30-50psi turbos on their little vtecs, but in actual airflow its prolly about the same as my 8psi supercharger.. Its a measure of restriction, which is why its such a lame way of judging - and there is absolutly no way to calculate boost vs hp. You can only calculate fuel + air ..

-- Joe

 

ever been to a local circle track? they sometimes have 4 cylinder series and they have really lopey sounding exhaust notes, you ought to check it out its actually pretty cool granted its got just 4 cylinders