gilberjj
Needs a job
Friend of Fast
Posts: 3196
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posted November 18, 2009 01:40 PM
dedication!!!!
  
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Shane661
Needs a life
Posts: 11494
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posted November 18, 2009 02:20 PM
quote:
Made a trip to the machine shop today:
14 piston above, 12R below:
12R piston thickness, at center:
14 piston thickness, at center:
12R piston above, 14 piston below:
The machinist stated that the 14 piston did appear forged, and the 12R definitely cast. He also said that it was much harder to cut through the 12R piston; he theorized that it might be more brittle. None of this is gospel, just his opinion.
Anyway, perhaps with these additonal photos we can determine a little more about the 14 piston and it's suitability for nitrous usage, as compared to the 12R part.
I'm all ears. 
Shane
A seemingly decent article on piston basics:
http://www.mustangandfords.com/techarticles/mufp_0505_piston_fundamentals/index.html
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entropy
Moderator
Posts: 8671
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posted November 18, 2009 09:17 PM
Shane,
i've been coming to this site since it opened and this is the 1st time i've seen someone slice a couple pistons in the name of generating a good discussion.
hats off to you.
i LOVE this stuff.
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This moderator uses moderation in moderation
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woppi
Pro
Posts: 1362
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posted November 19, 2009 01:05 AM
thanks for info !
auuuutsch -- killed pistons !
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1st TFA Member / Austria !
" if it has wheels or titts - sometimes you will get troubles "
2000 Limited ZX12R NOS
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Y2KZX12R
Needs a job
CompetitionCNC.com
Posts: 3762
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posted November 19, 2009 03:45 AM
It appears the top ring is thinner and the second ring is shallower. The second land is shallower as well.
If I was to stay on a big hit of nitrous for 10-15 seconds I think I'd increase the squirter volume and make sure its aimed correctly.
Most of the heat in the piston is removed by the contact with the cylinder wall. But increasing the heat removed by oil (squirters) is a good idea.
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Y2KZX12R
CompetitionCNC.com
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Shane661
Needs a life
Posts: 11494
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posted November 19, 2009 07:59 AM
 Edited By: Shane661 on 19 Nov 2009 16:00
quote:
It appears the top ring is thinner and the second ring is shallower. The second land is shallower as well.
If I was to stay on a big hit of nitrous for 10-15 seconds I think I'd increase the squirter volume and make sure its aimed correctly.
Most of the heat in the piston is removed by the contact with the cylinder wall. But increasing the heat removed by oil (squirters) is a good idea.
Here is a better close up comparison of the ring lands.
ZX-14 piston on left, 12R piston on right:
Shane
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Shane661
Needs a life
Posts: 11494
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posted November 19, 2009 08:04 AM
Edited By: Shane661 on 19 Nov 2009 16:05
quote:
Shane,
i've been coming to this site since it opened and this is the 1st time i've seen someone slice a couple pistons in the name of generating a good discussion.
hats off to you.
i LOVE this stuff.
I wish I could say that I did this strictly as an unselfish gesture to stimulate discussion. 
I'm actually trying to determine how much spray I feel comfortable starting with next season. The 12R pistons are a pretty well known quantity, so I figured I would make a comparison to them. RIght now I am feeling as though the 14 pistons might not be quite as sturdy for abuse...but that is just my gut feeling.
Shane
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Y2KZX12R
Needs a job
CompetitionCNC.com
Posts: 3762
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posted November 22, 2009 05:07 AM
iIn that pic the ring thickness looks the same. Hard to tell from pics thou.
Depth is clearly diferent.....
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Y2KZX12R
CompetitionCNC.com
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