entropy
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posted April 24, 2009 01:47 AM
 Edited By: entropy on 24 Apr 2009 09:58
new style JE pistons
from the top no real difference, except new ones don't have a detonation hole 
from the side, looking pretty similar, except a bit narrower skirt
underneath, big differences, bracing + thicker skirts + narrower pin bosses + dimple under int side Quench
measured em up tonight, all 3.4231 +/-.00005
you have to ask for new "Busa" style.
Better? 6 gm heavier. Significant? who knows.
I like the thicker skirt.
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TRNorBRN6001
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posted April 24, 2009 05:18 AM
Hey Karl, are you going to use those surface gap spark bolts to keep the compression up?
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psycho1122
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posted April 24, 2009 05:18 AM
entropy;
would you care to know what I would do to the new pistons before installation?!?
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osti33
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posted April 24, 2009 06:36 AM
Edited By: osti33 on 24 Apr 2009 14:37
quote:
you have to ask for new "Busa" style.
Better? 6 gm heavier. Significant? who knows.
I like the thicker skirt.
Those damn busa guys get everythng. 
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entropy
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posted April 24, 2009 07:39 AM
quote:
entropy;
would you care to know what I would do to the new pistons before installation?!?
hey psycho!
yes i certainly would like to know.
BTW: right after taking tose pix, i cut down the sharp spots;
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tcchin
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posted April 24, 2009 08:10 AM
Do you still anticipate having a spark plug clearance issue? I notice that you spent some time processing the center of the piston crown. Or were you just trying to make up for some of those extra 6g?
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Stuart Racing
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posted April 24, 2009 09:42 AM
quote:
from the top no real difference, except new ones don't have a detonation hole
from the side, looking pretty similar, except a bit narrower skirt
underneath, big differences, bracing + thicker skirts + narrower pin bosses + dimple under int side Quench
measured em up tonight, all 3.4231 +/-.00005
you have to ask for new "Busa" style.
Better? 6 gm heavier. Significant? who knows.
I like the thicker skirt.
Damn, that piston on the left looks pretty sad....Musta had a rough day....LOL...
Good looking pistons compared to the old style....
In my old KZ n20 motors, I would use high compression pistons just to have more material on the top of the pistons in case of small ign. timing mis cues....
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VincentHill
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posted April 24, 2009 11:35 AM
The #1 thing I noticed were the Ribs! Second the Skirt looks longer but narrower, Third is the Depression under the Bottom RIng Land
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entropy
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posted April 24, 2009 11:47 AM
Edited By: entropy on 24 Apr 2009 19:58
Tim,
i took down under the plug a bit for safety, although there is enough clearance for the Denso's. Like you say, also helps the weight a lil bit.
Stuart,
yep, that piston had a rough day, but before it went to sleep, it propelled Doug Meyer to new US record for NA Kawasaki 208.793mph, and even got my TFA to 208.740.
Vincent,
you are correcto except for the skirt length, they are the same, both cut down from "normal" JE's for 12's.
Also pin boss is narrower, and its thicker around the rings.
all in all, it's generally more robust.
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KZScott
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posted April 24, 2009 04:47 PM
Looks like a very tough piston! I would have chamfered the edges of the valve pockets a bit more, but Ive been building for nitrous, and a little extra rounding at the cost of compression is no issue. my .02(cad )
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whitehendrix
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posted April 24, 2009 08:31 PM
its the hot sex bro.
i love new minty pieces like that.
i'll stare at em a bit and molest them in my mind before installation most times.
still amazed at how smoothly the erosion looks on the piston that detonated.. just like it came out of a waterjet like that.. crazy stuff.
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psycho1122
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posted April 26, 2009 06:56 AM
Nice widdle job on the pistons!
I would go a little further and take the edge off the valve pockets. No sharp edges.
Next, I would tape up the piston ring lands and lightly bead blast the top. This gives a teflon like look to the top of the piston. Allowing carbon to build up a nice even layer and help insulate the piston from combustion temps.
All this with a good map running 12.7/8-1 A/F allows me to run 14:1 on 91 pump!
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dougmeyer
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posted April 26, 2009 08:53 AM
Edited By: dougmeyer on 26 Apr 2009 17:29
Here's an example of what I do to those pocket edges. This is a ZX-11 piston for a little project I'm working on.
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brendasue555
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posted April 26, 2009 10:16 AM
Now that is a fine ass piston!
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entropy
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posted April 26, 2009 10:20 AM
quote:
Now that is a fine ass piston!
it sure is, and i betcha there are 3 more just like it!!!
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entropy
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posted April 26, 2009 10:21 AM
quote:
Nice widdle job on the pistons!
I would go a little further and take the edge off the valve pockets. No sharp edges.
Next, I would tape up the piston ring lands and lightly bead blast the top. This gives a teflon like look to the top of the piston. Allowing carbon to build up a nice even layer and help insulate the piston from combustion temps.
All this with a good map running 12.7/8-1 A/F allows me to run 14:1 on 91 pump!
cool!
Now i gotta go buy a bead blaster!
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brendasue555
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posted April 26, 2009 10:25 AM
Hell yes Karl bead blast everything. It is amazing what you can do with one of those things.
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tcchin
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posted April 26, 2009 10:55 AM
Bead blasting is the civilized way to clean exhaust ports and dress brake rotors.
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tcchin
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posted April 26, 2009 11:00 AM
quote:
still amazed at how smoothly the erosion looks on the piston that detonated.. just like it came out of a waterjet like that.. crazy stuff.
Hey WH, the hole in the middle of the piston is the result of melting, not just erosion. That's why it looks so smooth. As I understand it, the rod small end was melted, too. One weekend, one set of cases, one crankshaft, two sets of pistons, two sets of rods - one big pile of scrap in the shrubs behind the house.
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brendasue555
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posted April 26, 2009 11:08 AM
lmfao
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dubious
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posted April 26, 2009 12:01 PM
Not likin the valve pockets near the edge of the piston much. Notice the old ones chunked off...
I too radius all the sharp edges off my pistons.
I cut those things right down, and honestly do not understand why the manufactures don't cut them right off when they are only 1-2 mm wide and 2-4 mm deep... looks like and opportunity to take out my turbo...
... all they would have to do is make the valve releifs 2mm larger ....
any idea's or input to my comments?
am I wrong or missing something here
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dougmeyer
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posted April 26, 2009 02:16 PM
If they made them larger on the diameter you'd increase chamber volume (lose compresh). By doing it the way they do, they give you the max and let you decide on the reliability/power tradeoff.
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entropy
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posted April 26, 2009 03:50 PM
Edited By: entropy on 26 Apr 2009 23:58
dubious,
I have to be careful about how far i trim down the "sharp spot", the deepest aprt on the int pockets are only .020 from cutting into the ring land.
BTW: right after taking the comparison pix, i cut down the sharp spots (posted above)
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whitehendrix
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posted April 26, 2009 08:03 PM
dubious brought up exactly what i was thinking.. if the pros that design and manufacture the slugs know that more than likely the thin/sharp spots will be ground off, why the hell not tweak the program (CNC) to take the sharpies away and either beef up a bit here and there, or simply radius off those spots.
unless they're making batches of these things without regard to the application or HP goals.. as in customer A will use this on his street machine for a leisurely ride.. customer B will race and spray, but we're gonna make wm the same anyway so as to not deviate any.
i dunno.
just odd.
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Duct tape is the handyman's secret
weapon. The black is for formal
occasions. - ZRXDean
ill never own a busa unless
someone gives me one.... and then
ill sell it -KZScott
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TRNorBRN6001
Needs a job
Posts: 2021
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posted April 27, 2009 05:32 AM
I like them ZX-11 pistons, hope they make a jog down the Mile in October.
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