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Old 02-06-2009, 07:26 PM   #1
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Default a couple of OS Speed questions

How many shims are supposed to be run under the head button (I am using Byrons race 30%)? I am running the alluminum one and the copper one right now. Also I am going freshening up the mill, and am curious if anyone has run the jx ninja piston, sleeve, connecting rod in this mill with any good results. I ask because I am running it in a truggy and from what I have heard the Jx seems to be a real popular choice in truggies, and the speed is more popular in the buggies
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Old 02-06-2009, 09:44 PM   #2
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AS PER THE MAN:

Stock shims on the V-Spec, Speed and JX-21 are (1) 0.008" (0.2mm) aluminum shim and (1) 0.004" (0.1mm) copper shim.

If you use the EB Mod head button then you use only (1) 0.004" (0.1mm) copper shim.
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Old 02-07-2009, 08:20 AM   #3
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Originally Posted by rpm1968 View Post
AS PER THE MAN:

Stock shims on the V-Spec, Speed and JX-21 are (1) 0.008" (0.2mm) aluminum shim and (1) 0.004" (0.1mm) copper shim.

If you use the EB Mod head button then you use only (1) 0.004" (0.1mm) copper shim.
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Thanks Rev! Now how about the Jx piston, sleeve, and connecting rod in the speed case? Someone has to have tried it.
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Old 02-07-2009, 09:02 PM   #4
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come on now, no one has done this? I guess everyone is out racing this weekend. I believe I have heard of someone using the jx case and the speed piston and sleeve, but I don't know real world results. Is the speeds case that much different from the jx case? Maybe I should just simplify this and get a new speed piston and sleeve. It always ran good, I just feel like I could use some more bottom end for some of these short run up jumps. I don't really even know that the jx piston and sleeve would do that, but I am sure someone around here does.
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Old 02-07-2009, 11:39 PM   #5
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The JX internals will fit in a vspec case. The only difference is case volume and its very hard to tell in a vehicle. JX Internals are almost exactly the same as speed vspecs.
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Old 02-08-2009, 06:51 AM   #6
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Quote:
Originally Posted by hobdog View Post
come on now, no one has done this? I guess everyone is out racing this weekend. I believe I have heard of someone using the jx case and the speed piston and sleeve, but I don't know real world results. Is the speeds case that much different from the jx case? Maybe I should just simplify this and get a new speed piston and sleeve. It always ran good, I just feel like I could use some more bottom end for some of these short run up jumps. I don't really even know that the jx piston and sleeve would do that, but I am sure someone around here does.
You could always just gown down a tooth on the cluthbell or tune your clutch for a little more punch for those short run jumps.
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Old 02-09-2009, 09:41 AM   #7
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I know the black coat is pretty, but isn't the jx-21 case better in that it doesn't have the cracking issues the speed and v-spec cases have?
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