can any one help a brit out with porting info???? - Kawasaki ZX-10R.net
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post #1 of 16 Old 01-20-2010, 03:13 PM Thread Starter
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can any one help a brit out with porting info????

hi

I cant find info im after in the uk so hope you guys can help out,
sorry if its been asked before.

ok im just in the process of stripping and rebuilding my race bike (zx10r 06)
what i need to know is when porting the head is it best to make the ports as big as poss or just stick with keeping them as they are and just matching them (size)
also if i go bigger how big?


thanks in advance
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post #2 of 16 Old 01-20-2010, 03:43 PM
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you actually want to get them smaller. do a search, there are some info on this. i think garth is the one you should talk to
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post #3 of 16 Old 01-20-2010, 03:45 PM
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Garth is not here anymore.

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post #4 of 16 Old 01-20-2010, 03:46 PM
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Quote:
Originally Posted by minichevy View Post
garth is not here anymore.
wtf ?

06 zx-10r MPS nos kit (40 dry)NOS mini controller , Brocks ex (Full undertail system) Piper cross (Air filter) PowerCommander 111 HUB and Quickshifter Carrozzeria v-star rims(HPC map and tune) 2011 zx-10r Austin vr 250 mm pipe, Guhl reflash, bazzaz self map w/ quick shifter, Bmc carbon race filter,attack rear sets,driven sprockets -1/+1 OZ racing wheels. Special Thx GUHL MOTORS,HOUSE OF SPEED 2011 lexus is-f
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post #5 of 16 Old 01-20-2010, 03:54 PM Thread Starter
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smaller? i`v searched the forum but still dont get it!!
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post #6 of 16 Old 01-20-2010, 03:56 PM
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If you are doing it yourself, keep the shape and general size, and smooth out all surfaces, including unshrouding the valves. Look at the race manual, the process is described there. Get a good valvejob, install stiffer springs, and you're good to go.
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post #7 of 16 Old 01-20-2010, 04:02 PM Thread Starter
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this is why im confused , everyone in the uk tells me to stick with stock valve springs and valves.
I`v manged to get a thin head gasket so was just hoping to tidy the head up enough to get at least 180bhp
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post #8 of 16 Old 01-20-2010, 04:14 PM
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Like was mentioned before, if u are doing them yourself just clean them up a bit. If u are going to have them done there are pro's out there who actually make the ports smaller to maximise velocity. I read of this on one of Garths threads (wish he was still around....). They were claiming around 10hp gain.
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post #9 of 16 Old 01-20-2010, 10:10 PM
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Most pro porters (Carpenter, KWS, Lee Shierts, Lazer, Comp CNC) will open up the port volume. The reduced choke velocity port is an alternate, less common method. I picked up 8hp with mild porting, a race cam, 14:1 CR, and .026" squish. I have a small-port head now on my turbo, built by Ryan Kallina, but haven't tested it back-to-back yet. The stock valves are fine for normally aspirated motors. Swap out the Ti ex valves for turbo or heavy nitrous use, too much heat.

If you plan to use the motor at high rpm ranges, I would highly suggest a set of stiffer valve springs. Not only will the head perform better with more accurate valve closing, but you will help to prevent valve spring retainer failure. The Carpenter 62lb single springs are $150 from Schnitz Racing. The APEs are a bit lighter weight, double spring, and around the same price from APE.
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post #10 of 16 Old 01-21-2010, 05:19 AM
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calling garth calling garth


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