Re: duration spread whats needed?
[Re: mafo]
#566749
12/31/09 09:52 AM
12/31/09 09:52 AM
|
Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
|
Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
|
Quote:
my motor have 2.25 / 1.55 valves maybe it has something to do with it..
On your PS motor, what is the LSA and installed at. The fact that you run a small valve on the exhaust is why it has so much duration. Like was said already it force over time to measure power.... every pulse (firing)in a minute is what is measured.... put more pulses in that minute it will be more(if you can get the air/fuel in and out). Now when you get high rpm you have to REALLY control the valves... bounce off the seat will kill the power(letting that pressure out with only a very short period of time to play in)
|
|
|
Re: duration spread whats needed?
[Re: mopar dave]
#566754
01/01/10 08:00 AM
01/01/10 08:00 AM
|
Joined: Feb 2009
Posts: 1,019 Finland
mafo
super stock
|
super stock
Joined: Feb 2009
Posts: 1,019
Finland
|
114.5 separation, installed at 110.5
-65 Valiant,420", all motor,2700#, dot tires, 8,42 @ 160,2
|
|
|
Re: duration spread whats needed?
[Re: mopar dave]
#566755
01/01/10 12:54 PM
01/01/10 12:54 PM
|
Joined: Oct 2007
Posts: 4,219 New York
polyspheric
master
|
master
Joined: Oct 2007
Posts: 4,219
New York
|
Best answers: 1. ask your head porter for the flow data (bias), and what cam he recommends, if he builds engines with these heads similar to yours. If he doesn't, take the flow data to Harold Brookshire, etc. 2. duplicate the cam choice used successfully in an engine as similar to yours as you can find - especially size, head casting and porting, rocker ratio, and manifold.
What not to do: Average, interpolate, or "take the best of both" from more than one model.
Boffin Emeritus
|
|
|
|
|