Which(size & brand) cams are you running with your ported head?
Ted,
given that the JUN 272s have significantly more duration at 1mm than the HKS 280s, what would your guess be as to the impact of those cams on my setup, assuming a pump gas tune only? (Mods, current dynochart)
l8r)
given that the JUN 272s have significantly more duration at 1mm than the HKS 280s, what would your guess be as to the impact of those cams on my setup, assuming a pump gas tune only? (Mods, current dynochart)
l8r)
Last edited by Ludikraut; Apr 10, 2007 at 04:29 PM.
That all depends on how well the head is designed from the get-go. In some cases, it's possible to increase both up to a point. That is the goal of what the industry traditionally calls a 'street port'.
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Wow, what a difference a day makes! I come back to this thread, and a lot more discussion on this. Keep this going, people.
Do we have any more people wanting to list? Discussion is good, but lets not forget why I started this thread. Thanks, everyone!
Do we have any more people wanting to list? Discussion is good, but lets not forget why I started this thread. Thanks, everyone!
Lopey idle, weak vacuum, and some reduced low speed response. IMO, your turbo is on the low side of what I'd consider for those cams. To be honest however, I probably choose JUN 272s for any EVO with a ported head. IMO, the mild lift figures for those cams make them best suited toward big turbo applications that (for whatever reason) are retaining a stock head, but upgraded valvetrain.
They won't.
Duration at 1mm is what's important, as well as ramp shape, and of course a ported head's ability to make use more lift. It just doesn't make sense to me to throw all that money after a head, and allow the cams to be the limiting factor. The HKS cams are convenience grinds for stock heads and valvetrains, and not much else. Better grinds will outperform them 10 times out of 10.
Duration at 1mm is what's important, as well as ramp shape, and of course a ported head's ability to make use more lift. It just doesn't make sense to me to throw all that money after a head, and allow the cams to be the limiting factor. The HKS cams are convenience grinds for stock heads and valvetrains, and not much else. Better grinds will outperform them 10 times out of 10.
So all the other cams that I listed will not make more power than the HKS cams?
Scorke
don't ever see such a thing offered or implicated. most people are like on stage 50 port and polish with eggs, sausage and bacon on an english muffin.
Durr, I had trouble reading the way you replied to my response, forgive me haha. Ted think you could send me some PM's regarding your 35R setup I am going to be mimicing lots of it, different manifold but same intercooler and cams and lots of other mods, interested in what I should be shooting for.
Scorke
Scorke
What you are asking for is a little hard to do. On a turbocharged engine when you increase the airflow on the exhaust side you give up velocity. Thats just the way it is. In this case you can't have your cake and eat it to. You have to find a balance. I have spent, what seems like a life time in front of a flow bench developing different ports for different setups and have a firm hold on this. If you are looking for huge topend, you will be limited on spool up and may have to rely on a little spray to get you going, or you will have to give up a little topend to keep your spool a little late and still have some topend. Thats just the way it is. PM me for my phone number if you want to talk about your setup.
Last edited by HEAD DYNAMICS; Apr 19, 2007 at 11:55 AM.
Just so knowone comes on here and says that im wrong. Im not talking about when you increase flow the velocity goes down on a head where you are increasing flow by only 10-20 cfm. Im talking about a ported head, not some guy who cleans up the castings and blends the shortside radius a little bit.
