Extractor Lenght...

[chinozie]

Need to make some calculation, but got blur with some "terms" already...
the calculations :

Pipe Lenght = [ (850 x ED) / RPM ] – 3

ED = 180 + number off degrees the exhaust valve opens before BDC and with the pipe length at ED in inches

RPM = engine speed for which the extractor are being tuned



The questions :
1) In ED, what's the defaults exhaust valve degree of SVT and BT b4 BDC...need more explaination on ED


2) In RPM, is the engine speed based on out RPM cut off...or else...or is it the results from dyno chart ?



Please advice...
Thanx in advance...

 

[sincere1]

The following information was extracted from ''The Modified 4AGE Page''

the exhaust length
you need to find out the number of degrees your cams have between when the exhaust opens to when the inlet opens, then read up to the revs, then to the numbers on the left hand side, which give you the length of the exhaust in feet. Another example, you'd want the effective exhaust length (The distance from the middle of the exhaust valve to the first muffler) to be about 3 3/4' long.

the inlet length
On the bottom of the diagram is where you go across with your inlet cam timing, and then read upwards until you hit the line at the revs you want the most benefit from the correct length inlet. Then look on the left hand side and read off the number, which is in inches. As an example, a 4AGE with fairly big cams which you want to make max power at around 8,000 rpm would need an inlet length of about 10".

 

[nappx]

wow...interesting!!!
like math, already...

 

[KHWONG]

waohhhhh.. apatu .. total lost.. really sifu's matters.

ahha.... anyway.. nice thread

 

[chinozie]

thank you very much sincere1...
it's from Bill's page right ? didn't see that coming...heeee

 

[netmatrix]

ED is Engine Degree or Erectile Dysfunction.......................... *cabut!!!*

 

[chinozie]

hahahahah...you laa the one...kihkihkih