Need some CB360 spec from the head, please.

[tweakedlogic]

So I was thinking about making some pipes. I'm going to a lot of troble to build this engine, i want pipes too. I decided it would be better to start with science to get me in the ball park and move on to the art of pipe building from there. Unfortunately, there are many values I don't have and can't find. I found this nifty calculator http://dairally.net/daihard/chas/MiscCalculators/DaiPipes.htm and would like to have fewer blanks. Mostly cam open/closing times as well as duration. Valve and port size etc I can measure from my own heads.

Please, if you have any of the needed values for a 75 CB360, will you let me know? I've been searching for hours. I found mega cycle's cam values, but little else.


Edit:
Alright, I found some finally.
Intake opens @ 5* btdc' closes 40*atdc
Exhaust opens @ 40* btdc' closes 5* atdc
duration 221

I still need valve lift, and to figure out the port volume. I have spent all this time searching that I haven't gone out to measure the valve diameter or ports.

 

[4 stroker]

valve lift is 0.341 inch , intake valve is 1.339 inch exhaust 1.102 inch.
and maybe I'm wrong but i thought
intake opens 10° btdc - closed 34.5° atdc
exhaust opens 48.5° btdc - closed 1° atdc

port volume will very from port to port due to mass production.

kind regards

 

[tweakedlogic]

Thanks 4 stroker. The specs I found came from here. https://drive.google.com/file/d/0B8RLEMngUB63bEZGc2tJNW5ZSGc/edit
I did think those numbers looked odd. I plugged in what numbers I had and the output for intake length was very close to what Sonreir came up with in a post I can't find now. (I had copied it and saved it)

I'm trying to build an intake and exhaust system that will give me really good torque in the midrange but not limit my top end power too much. The tricky part is that I ultimately want a 2 into 1 pipe and I'm going to have to factor the reflected wave on both ports. But that comes later. I want to figure out the optimal head pipes first.

 

[tweakedlogic]

I thought this would generate more discussion about building intakes and exhaust... especially with the link to the calculator. first time I was wrong.

 

[barnett468]

I thought this would generate more discussion about building intakes and exhaust... especially with the link to the calculator. first time I was wrong.

these are complicated subjects that very few understand which is likely why you did not get other posts . . probably better to get no posts then get ones with wrong info in them.

 

[4 stroker]

what intake lenght did you come up with? crazy pj did some tests and calculations for a 2 into 1 exhaust.