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Old 06-28-2002, 08:00 PM   #616
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Old 06-29-2002, 08:17 AM   #617
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ok thanks
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Old 06-29-2002, 08:23 AM   #618
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Quote:
Originally posted by ixlr8nz
I wouldn't recommend using dry ice or the like to cool motors before running, as it will make the bushings shrink causing a tight fit between the shaft and bushing IMO.
The ice will also cool and shrink the shaft at the same time, so the fit does not get tighter.

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Old 06-29-2002, 09:37 PM   #619
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Wouldn't the bushings shrink more than the shaft as it is a different material?
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Old 06-29-2002, 11:03 PM   #620
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If the bushing shrinks it should widen the hole, 'cuz the material becomes compact as it shrinks.

Just my 2 cents.

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Wouldn't the bushings shrink more than the shaft as it is a different material?
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Old 06-30-2002, 12:21 AM   #621
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dry ice or regular ice?
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Old 06-30-2002, 12:23 AM   #622
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Quote:
Originally posted by ixlr8nz
Wouldn't the bushings shrink more than the shaft as it is a different material?
OR maybe the shaft would shrink more than the bushings, as it is a different material too. Seriously, I don't know which would shrink more, but I have put stock motors on ice for an hour before a run and they run a lot better, no sign of binding or anything.

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Old 06-30-2002, 05:40 AM   #623
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I do hereby repent of using ice cubes on my motor. I know that electricity and water do not mix. I will be careful to not do anything that will short out any of the electricials on my car. I will no longer miss qualifiers or mains because of using this unsavory combination. I am completely reformed. Hmmm, i wonder if i can find a source for dry ice?
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Old 07-01-2002, 04:58 AM   #624
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The ice is a big jim tip from the black book. use a bag. Both materials will expand and contact with heat. However brass does this at a faster rate than steel (shaft). The difference is not enough to worry about. The mass transfer rate of the materials is within tolerance or different material would have been used.
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Old 07-01-2002, 05:20 AM   #625
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the bag is a good idea, I have used an ice cube and have had myriad problems. BJ said that he didn't "think" that it would hurt anything, but I can tell you a motor later that it does. people at the track have told me: "big jim or no big jim don't put any more ice on your motor." and I agree. I see that the magazines have been jumping on this tip. all I can say is don't do it!
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Old 07-01-2002, 05:28 AM   #626
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I don't. I personaly do not do this or do I need to split hairs yet..... Need to get faster first I will heed the lesson.
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Old 07-01-2002, 07:52 AM   #627
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If you are going to use the ice cube put it in a bag like a sandwich bag and then put it on the motor. Don't put it directly onto the motor or you will experience problems like the poor Rev did. The water has to go some where.
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Old 07-01-2002, 10:57 PM   #628
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I had some small gel ice packs ready to go, just couldn't be bothered pulling the motor out and putting the ice packs around it.

The gel packs were defrosted, then an old motor can put between them then re-frozen(With a rubber band holding it all together). It meant that the can would be completely enclosed with icy gel pack if I had used them before a race.
Looked like a donut, just little frozen packs held together with the rubber band.

A better idea than just leaving an ice cube on the motor, I just never liked the idea myself.
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Old 07-03-2002, 03:53 PM   #629
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Some time ago I brought a P2K2 Pro and I was well happy with it, until I blew it up - overgearing, nothing to do with the actual motor. I went out and got a new one though, but it was a bit different. it has a pair of green springs instead of green/red, and the rpm on the dyno seems a little low. it says Pro on the can and packaging. what im asking is have Trinity changed the spirngs on the Pro version or did I get a flukey mistake motor?

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Old 07-03-2002, 09:22 PM   #630
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Trinity recently switched to the Fantom Dyno. Your old motor was probably tuned using the Robitronics dyno. I don't know what voltage the Fantom Dyno ran the motor at but they do have the capability of testing them at 7 volts. I would venture to guess that the Robitronics tested motor was done at 7.2 volts.

As for the springs, only Trinity can answer that question. Maybe that motor liked those springs but that is just speculation on my part.
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