Porting degress BTDC,ATDC etc article??

[royal]

Does anyone know the link to an article that shows examples of degrees that ports are opening and closing? I was sure it was on rotary engine illustrated but can\'t seem to find it?

It has racing beat street porting, bridge porting etc and what the opening/closing times was, along with similar from other US tuners.

Or if anyone has any info? anyone would think its the holy bloody grail IMO people would still take their cars to the tuners as they are practices at it?

[royal]

Lol, find it in my own posts
http://www.turborx7.com/porttiming.htm

[shaunwil]

I noticed this as well, interesting book. Not sure if its much help. Nice write up on the ports

http://www.wankel.net/~krwright/files/manuals/REbyKenichiYamamoto-1981.pdf

Shaun

[Bobbit]

^^^ first link does not work for me?

[royal]

I noticed this as well, interesting book. Not sure if its much help. Nice write up on the ports

http://www.wankel.net/~krwright/files/manuals/REbyKenichiYamamoto-1981.pdf

Shaun

Great find mate, I was considering buying that if I could find it. There\'s some hardcore maths in it lol

[royal]

^^^ first link does not work for me?

Fine for me mate?

[shaunwil]

Great find mate, I was considering buying that if I could find it. There\'s some hardcore maths in it lol

Its on the same web page with the workshop manuals. Definitely an eye opener.

Shaun

[royal]

Is anyone able to confirm some timings for me? I\'ve done my exhaust ports and just been measuring the timing to make sure I havn\'t gone too far early. My hair brained thoughts are that I want them to open up earlier to help spool the turbo sooner with higher EGTs. I\'m not massively bothered about top end and don\'t want to sacrifice mid range so I\'ve only gone a little bit upwards so I don\'t get much more overlap with the intake ports.
 I\'m toying with the idea of going more extreme and doing a half bridge but want to read up more on the effect of the overlap on a turbo engine. If it was an NA I wouldn\'t want it but it seems that the overlap doesn\'t effect midrange as much with a turbo? could be wrong?? anyhow...

I\'ve got them opening up at 84 deg BBDC which (luckily!) is the same as Racing Beat do their street ports so thats good because I was worried I\'d gone a bit far hence getting out the protractor!

The part thats confusing me is the exhaust closing time. I\'ve only gone up a millimeter ish so hardly changed it from stock at all. I\'m measuring it as 58 degrees ATDC. According to the article above the stock ports are 48 ATDC and the racing beat street ports are the same. If anyone could measure it for me that would be most greatness! even if you just measure up the housing and I\'ll convert if to degrees myself with my amazing contraption here


Super professional protractor looks just like a cd with cardboard stuck to it :wack:

[royal]

Just to clarify! I\'m not asking anyone to measure anything on my pictures! they were for comedy value!! Don\'t want any tuner \'dark secrets\' either. Just want to know the stock exhaust closing timing? thankyou please.

[karl_tate]

your doing a good job doing it all your self and learning along the way.

btw i dont have a clue :rollin