thutch26
Expert Class
thutch26
Posts: 483
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posted March 22, 2008 05:20 PM
ported head dilemma???
tell me what you guys think?
http://psychobike.com/cgi-bin/ikonboard.cgi?s=305ac7d1ca49ec0ceb25f767c82022e6;act=ST;f=1;t=60542
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Gettin faster everytime I go to the track!!!
  
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smokinzx14
Needs a life
Posts: 10197
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posted March 22, 2008 05:27 PM
looks just like it should look ...Cut them out and you will have toss the head in the trash ... all 06 07 08 zx14 heads look just the same ...
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Smokin Performance Cycles..
Tampa Bay , FL .. Brocks Performance Dealer ..
Gen 2 ZX14R Best ET 8.43 , Best MPH 164.95
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thutch26
Expert Class
thutch26
Posts: 483
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posted March 22, 2008 05:40 PM
thanks for the info smokin... I got a friend that is ports his own heads by hand and wanted to know why these lips were left on there? looks like I should let him know!
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Gettin faster everytime I go to the track!!!
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Y2KZX12R
Needs a job
CompetitionCNC.com
Posts: 3762
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posted March 23, 2008 02:43 AM
I've spent many, many hours (days) testing and modeling the zx14 exhaust port. We actually do not CNC the exhasut port bacause of the need for that (lip)
That shape is there to promote tumble in the port (bad)to mix the fresh incoming air into the exhaust stream. It also has an effect on wave reflection (good). Reducing the flange floor area by about 25%, to about 3/8" in the port will increase the flow volume, reduce tumble, while maintaing the needed velocity.
You should be very carefull thou if you want to modify that exhaust port. Its a tricky one.
Once you get above 1500cc or use nitrous or a turbo then its a whole new ballgame. The port requires major modifications.
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Y2KZX12R
CompetitionCNC.com
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