Re: 360 Piston Choice
[Re: elmor]
#1332566
11/09/12 09:16 AM
11/09/12 09:16 AM
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Joined: Oct 2003
Posts: 21,345 Marysville, O-H-I-O
70Cuda383
Too Many Posts
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Too Many Posts
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
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If you have open chamber heads, the 107s are a great choice. if your deck height has been shaved and they end up at "zero deck" and gives you more compression than you want, then you can take those 107s and have some, all, half, etc. of the dome shaved off.
you can do it to create a quench pad by only milling on half the piston, you could mill evenly off the whole top, etc.
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Re: 360 Piston Choice
[Re: 70Cuda383]
#1332567
11/09/12 02:21 PM
11/09/12 02:21 PM
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Joined: Jan 2005
Posts: 12,419 Kalispell Mt.
HotRodDave
I Live Here
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I Live Here
Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
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Quote:
If you have open chamber heads, the 107s are a great choice. if your deck height has been shaved and they end up at "zero deck" and gives you more compression than you want, then you can take those 107s and have some, all, half, etc. of the dome shaved off.
you can do it to create a quench pad by only milling on half the piston, you could mill evenly off the whole top, etc.
The 107 don't have any dome.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: 360 Piston Choice
[Re: HotRodDave]
#1332568
11/09/12 02:27 PM
11/09/12 02:27 PM
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Joined: Oct 2003
Posts: 21,345 Marysville, O-H-I-O
70Cuda383
Too Many Posts
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Too Many Posts
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
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Quote:
Quote:
If you have open chamber heads, the 107s are a great choice. if your deck height has been shaved and they end up at "zero deck" and gives you more compression than you want, then you can take those 107s and have some, all, half, etc. of the dome shaved off.
you can do it to create a quench pad by only milling on half the piston, you could mill evenly off the whole top, etc.
The 107 don't have any dome.
Dang it! I keep doingthat!!!
Mixing up the 107s and the 190s!
He said he was worried about them making his compression too high, which put in my head, the domed pistons.
if he's using open chamber heads, the 107s are going to be VERY low compression. I used them on a edelbrock headed, stock stroke 360, and compression there was 10.7:1 an open chamber head would drop those down to probably 9.0:1 or less.
Last edited by 70Cuda383; 11/09/12 02:29 PM.
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Re: 360 Piston Choice
[Re: elmor]
#1332571
11/09/12 10:38 PM
11/09/12 10:38 PM
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Joined: May 2008
Posts: 5,399 Aurora, Colorado
451Mopar
master
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master
Joined: May 2008
Posts: 5,399
Aurora, Colorado
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The speed pro pistons will get you in the 9.2 to 9.5: compression area, but have no quench effect. The KB107 is closer to a zero deck flat top which will increase compression over the speed pro piston. You should CC the heads and that will really help in calculating the compression. I built my 9.5:1 engine with the KB-232 0.050" quench pistons, but it requires alot more machine work. The piston is designed for magnum rods pin widths so the machine ship had to mill the pin end of my rods, the block was decked to square it up and get the pistons near zero deck height, then the heads has to be decked between 0.040" and 0.050" to set the quench pad to the recess area of the head (zero clearance without gasket.) The gasket provides the quench clearance. For a simple 9.5:1 engine, I don't think it was worth all the extra pains just to gain a small amount of quench area. I think if I was doing a simple 360 with 9.5:1 compression, I would just use the speed-pro pistons.
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Re: 360 Piston Choice
[Re: 360view]
#1332573
11/10/12 01:12 PM
11/10/12 01:12 PM
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Joined: Jan 2005
Posts: 12,419 Kalispell Mt.
HotRodDave
I Live Here
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I Live Here
Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
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I looked into that before and could not find a way, I did not look into aluminum rods but I don't think they are gonna get much lighter than a SCAT I beam, the lightest common affordable strong rod. I think if you got some custom ultra light pistons you could MAYBE do it but even then you would probably have to weld up the existing balance holes in the counter weights and grind off the casting protrusions on the pin side of the crank.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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