Alex-7

Felixwankle88's new car thread mentions building "a high compression stage 1 Kahren port motor" or something like that.

Could you guys please explain this to me. What's involved in a Kahren port? and what is done to achieve higher compression?

I've never heared of this before today.




Thanks,

--Alex

SonicRaT

iTrader: (6)

He means S5 N/A rotors (9.7:1 compression), with a porting template designed by Kahren (forum member)

Alex-7

Thanks

I don't spend much time in here.....



What's the nature of Kahren's template?

X-JaVeN-X

I was curious about this too. What's the difference in his ports vs. street, bridge, etc ports?

ultradef

Kahren made some amazing #s using a NA 6 port block...195 whp. Here is the thread:

https://www.rx7club.com/time-slips-dyno-128/na-6port-streetport-dynoed-195whp-update-418805/

SonicRaT

iTrader: (6)

Nothing much, just a little bit different design, and a little different on the ammount of port timing they use/don't use. A lot of people have their own templates of what they think is the best port.

X-JaVeN-X

Ah, ok. I was just curious as I'm getting my motor ported in a week or so. I had been planning on using the RB templates for a street port. So we'll see how it goes.

Alex-7

RB are very conservative.

You should go with this guy.

BlaCkPlaGUE

He got some good numbers becuase he used a custom intake manifold, wich i am very curious to actually see.

ddub

No... the custom intake manifold car is HIS car. His car is stock port with standalone and custom intake manifold/header. HIS car made high 180's for rwhp. The car in the link above was a customer car. That one had RB header, RB presilencer, RB catback, TII intake manifolds, S-AFC, and an s5 n/a block that he built with his stage 1 ports and was also backing off before redline and before power finished peaking because he had maxed out the injectors and it was running too lean.

Kahren will sell his port templates to some people, and obviously also does port work. In my experience so far, not many people have been able to replicate his work/ports extremely well. The secondary isn't hard, but where most people have trouble is the primary. They are streetport templates, stage 1 he says gives up nothing really in the low end and should allow an 800rpm idle still. He also has a stage 2 port that requires solid corner seals, gives up a little low end, and will idle around ~1000rpm. His exhaust port seems to work pretty well also. Anything other than streetports he does on a customer by customer basis, but he's not a fan of bridgeports after some of his testing.

This is a stage 2 against the stock primary port. Only difference in stage 1 is less port timing I believe.


This is a stage 2 against a stock secondary port. Again, I believe the only difference in stage 1 is a little less port timing. Excuse the fact that this template isn't fully lines up properly, it's a little off-center but still gives you a good idea.


This is kind of what the turbo exhaust template/orientation would look like. For NA just move the template up higher.

X-JaVeN-X

RB had a couple different versions...I was planning on going with their "large streetport" i guess you would call it. Still too conservative? I'm probably only going to be shooting for 300whp after all is said and done. Current mods are s4 TII block (soon to be ported) turbo back rb exhaust, true CAI (filter ran under waterbottle), 750cc secondaries, walbro 255, safc, s5 turbo (running 10-12 psi).

I know that alone won't get me to 300whp, but I figure it's a good start. Next mod will probalby be a koyo and fmic.

Anyway, back to my question...will the RB port be enough to make this 300whp a little easier?

ddub

In my experience RB is fairly conservative except for their exhaust ports. I'm not a huge fan of their exhaust ports, though. I see a lot of high end built cars using similar shapes to the one Kahren uses in the exhaust template above. But then again I also see a lot using the same shape as RB, so it's really up to you what you want to do and believe.

Kahren also makes Turbo templates of course, search for jacobcartmill and he posted pics of the ports a while ago I believe.

Alex-7

Yeah.

I wasn't thinking T2.




Damn, I want some Kahren templates.

ddub

His AIM name is kahren1981, or you can PM him on the board.

Like I said, he makes N/A and TII templates, stage 1 and 2, and also does porting work/builds for a price if you'd rather not do your own porting.

Alex-7

I've got a fresh motor currently.

But I will need one for an FC before too long,

He's in CT?

X-JaVeN-X

Thanks for the info. I may be messaging him later on, now that I know he does tII templates as well. Anybody else have feedback or #'s on his turbo ports?

ddub

Yah I guess so, somewhere on the East Coast. Way too far from me is all I know haha.

ddub

Here are pics of his TII ports, stage 1.

X-JaVeN-X

^nice....do you know what he happens to charge for templates? I'm at work so I can't use AIM here.

ddub

Not sure what he charges currently. He also usually isn't available during the day on AIM because most the time he has some project, customer, engine build, tuning session, or whatever that he's doing during the day. Best time to hit him up on AIM is the evening.

Alex-7

Thanks for the info dDuB.