| Author | Topic |
|---|
Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
|
|
Re: cam sizzing for boosted 18rgeu
|
Mon, 14 November 2005 20:11
 
|
 |
| rcodea wrote on Tue, 15 November 2005 06:19 |
Oldcorollas,
I am keeping my revs on the 18rgeu to an absolute max of 7k. i gather from your comments that I want a lob profile that holds the valve open at max lift for as long as possible, correct? That would make the lobs very rounded of the top, but also increase the stresses of the valves due to the increases acceleration the will be going through. What are you thinking?
|
thats pretty much what i'm thinking...
smack the valve open, hold it open for as long as possible then close it quick 
overlap will blow charge out the exhaust, and since you are not revving very high, you shouldn't need a long suration cam..
in an NA motor, a 272 should allow you to make power around 7000rpm or more... boosted, it may go to 8000-9000rpm... so basically, any extra rpm you cater for with your cam.. is wasted if you are limiting rpm anyway... if that makes sense...
but lift... lift is always good... you have a nbice reservior of pressurised air just waiting to get in, so you may as well give it the biggest opening
extra stress on valves is not great, but rpm also affects this loading a great deal...
|
|
|
