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GPZ750/810 racer running....

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GPZ750/810 racer marching on 19 Nov 2010 10:09 #413428

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imdb record setting suzi head
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GPZ750/810 racer marching on 19 Nov 2010 11:34 #413431

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www.flowbenchtech.com/porting/CRH/sps.htm

Here's another Suzuki
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GPZ750/810 racer marching on 03 Jan 2011 12:16 #419874

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forgot to say, nice shot larry! would be nice to see the side view too if its not a secret :)

been crnaking quite a bit in the garage, cycle side is 90% there, so giving some attention agian to the motor.

First step, some port castings, just to really "see" what's going on in there
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GPZ750/810 racer marching on 03 Jan 2011 12:21 #419876

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these are cyls 3 & 4, and the most baffling for me is the strong bulge outwards just after the valve guide, specially in #4

i can see that kawi engineers where trying to aim the flow more symetrically but somehow it looks wrong, but what do i know :)
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GPZ750/810 racer marching on 03 Jan 2011 12:22 #419878

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just in context

BTW, the "bathtubing" of the heads to get a squish band around is done too, will post a close up later
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GPZ750/810 racer marching on 03 Jan 2011 12:24 #419879

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here are the sections measured, the graph shows how it changes along the tract
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GPZ750/810 racer marching on 03 Jan 2011 14:03 #419904

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turboguzzi wrote:

just in context

BTW, the "bathtubing" of the heads to get a squish band around is done too, will post a close up later


Those heads don't have a lot of meat on in the roof on the long side of the bowls like the old 900/1000's do. At least the 82's didn't anyway. The 83's might be better. Be careful if you cut it significantly deeper on each side of the guide or you'll be getting out the epoxy ;)

If you look at your chart photo, the danger zone is between 2 & 3 ;) for grinding through.

They're not paper thin but they're not overly beefy either.

Punch the throats to 90% if you want and stay under valve diameter in the bowls. Valves should be 35mm if IIRC. Probably pushing around 70 @10 stock.

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GPZ750/810 racer marching on 03 Jan 2011 23:35 #419989

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thanks for the tips larry

so not much to do about the strong "S" line in 1 & 4?

my concern is that flow cant really stick to the outside wall (the right wall in cyl 4 for instance) so essentially the effective section gets chocked there and most of the flow conitnues to the pocket space left of the valve guide

The other thing i was considering was raising the floor a bit around points 4-5 for some venturi effect at the ssr.

Stock valve size in the GPZ is 34mm BTW, both port entry and throat are 29mm internal diameter = 660 sq-mm

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GPZ750/810 racer marching on 04 Jan 2011 04:28 #420003

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turboguzzi wrote:

thanks for the tips larry

so not much to do about the strong "S" line in 1 & 4?

my concern is that flow cant really stick to the outside wall (the right wall in cyl 4 for instance) so essentially the effective section gets chocked there and most of the flow conitnues to the pocket space left of the valve guide

The other thing i was considering was raising the floor a bit around points 4-5 for some venturi effect at the ssr.

Stock valve size in the GPZ is 34mm BTW, both port entry and throat are 29mm internal diameter = 660 sq-mm


Throat is common size for Kawasaki 2V sport bike motor at 85% of valve diameter if it's 34mm.

Punch throats to at least 88%. Push the seat all the way out on the face of the valve.

Punch exhaust throats to 90%. Push the seat out on the exhaust valve as well.
:)

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GPZ750/810 racer marching on 09 Jan 2011 07:36 #420955

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been pushing quite a bit on the cycle side....

gonna run a shortened tail, so some mockups for the seat base
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GPZ750/810 racer marching on 09 Jan 2011 07:38 #420958

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top
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GPZ750/810 racer marching on 09 Jan 2011 07:40 #420959

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gsxr shock in place
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GPZ750/810 racer marching on 09 Jan 2011 07:41 #420960

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shock reservoir secured..
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GPZ750/810 racer marching on 09 Jan 2011 07:42 #420961

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muzzy style adjustable link pull arms
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GPZ750/810 racer marching on 09 Jan 2011 07:45 #420962

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for quick rear height adjustment
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GPZ750/810 racer marching on 09 Jan 2011 07:46 #420964

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fork air pressure blocked off
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GPZ750/810 racer marching on 09 Jan 2011 07:49 #420965

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anti dive removed, holes shut, damper piston welded, re-drilled for stiffer damping.

aluminum axle spacers, also drilled up the second pinch bolt hole for better axle clamping
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GPZ750/810 racer marching on 09 Jan 2011 07:51 #420966

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lightweight rear caliper and hanger
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GPZ750/810 racer marching on 09 Jan 2011 07:52 #420968

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as well as 20mm hollow axle, oversize bearings and ally spacers.
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GPZ750/810 racer marching on 09 Jan 2011 07:55 #420970

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simple reaset is cheap to replace in a crash, gsxr MC, R6 brake pedal, quite a mix..
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