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Old 05-24-2004, 07:43 PM   #256
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Hi,
can anyone tell me whats the name of the red epoxy that is used in modified Engines crankshaft,,or what type of product is it....any help will be appreciated.
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Old 05-24-2004, 08:08 PM   #257
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Quote:
Originally posted by GAMBO94
Hi,
can anyone tell me whats the name of the red epoxy that is used in modified Engines crankshaft,,or what type of product is it....any help will be appreciated.
Try with hi-temp RTV Silicone, gasket maker (ultra black) by "permatex"
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Old 05-24-2004, 09:04 PM   #258
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Quote:
Originally posted by GAMBO94
Hi,
can anyone tell me whats the name of the red epoxy that is used in modified Engines crankshaft,,or what type of product is it....any help will be appreciated.
This is what i mean...
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Old 05-24-2004, 09:30 PM   #259
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Originally posted by GAMBO94
This is what i mean...
Yup
I'm using the black one , no problems at all
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Old 05-24-2004, 09:44 PM   #260
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Originally posted by wad
Yup
I'm using the black one , no problems at all
How does this help in the performance of the engine?
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Old 05-24-2004, 10:16 PM   #261
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Quote:
Originally posted by Motorman
I would only use ceramic on the piston crown, stay away from anything on the skirts and cylinder bore. Diamondlike (the great JP,RB secret)works well on the crankpin and wristpin though you will need to resize the bushings to compensate, and teflon benefits other areas.
Yes the ceramic coating is only for the top (crown) of the piston... after its applied you can take a torch and heat the top of the piston and the underside stays cool... amazing stuff. I thought it would help keep the air/fuel mixture in the crankcase cooler... I know it really lowers oil temp in our racing motors.
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Old 05-25-2004, 03:55 AM   #262
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Quote:
Originally posted by stefan
I had very good luck with my hardchromed crankpins so far, thanks to Edwards advise..
stefan,
Do you find this economical?
I would have thought the cost of chroming and grinding would exceed the cost of two or three new cranks.
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Old 05-25-2004, 04:47 AM   #263
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I pay $20 a crank..
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Old 05-25-2004, 04:54 AM   #264
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Originally posted by stefan
I pay $20 a crank..
Wow, thats very cheap. I would have thought the set-up cost just for the grinding would be much more than that.
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Old 05-25-2004, 05:04 AM   #265
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Why would you grind them?

I give them to the plating shop after break in and the put 7-10 microns of hard chrome on the pin.
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Old 05-25-2004, 05:15 AM   #266
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Quote:
Originally posted by stefan
Why would you grind them?

I give them to the plating shop after break in and the put 7-10 microns of hard chrome on the pin.
Hmmm . . OK, just 7-10 microns is it.
I was just relating to my own experience in having a 1:1 cars camshaft journals hard chromed. In that case the chrome had to be ground to size since apart from anything else, the chrome isn't deposited evenly and also leaves little mountains and globules etc.

But for only 7-10 microns, maybe the issue doesn't arise.
Also, as I understand it (or don't) hard chroming is different from "normal" chrome plating - something to do with ensuring the bond between the chrome and the substrate for a working part as opposed to a "decorative part. Again, maybe there's not an issue since the depth is minimal.

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Old 05-25-2004, 06:29 AM   #267
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don't know about the chrome, but my cousins company has a patented hard nickel process that is in the rockwell 98 range...
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Old 05-25-2004, 07:21 AM   #268
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Quote:
Originally posted by wad
Yup
I'm using the black one , no problems at all
Wad,
but does that RTV silicon get hard like epoxy when dry???
i dont think so,i have never seen a silicon that can get
as hard as epoxy when dry.....

anyways i will check on that permatex ultra black silicon.....Thanks..Luis
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Old 05-25-2004, 09:03 AM   #269
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Myself and a few other use Permatex Red RTV without any problems for more than a year.

The stuff doesn't have to be hard, it has to stay put.
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Old 05-25-2004, 09:05 AM   #270
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Oh, and btw, you know what the real reson for this stuff in the JP cranks is?

JP bores out the crankshaft towards the fron (clutch) to make it lighter and the putty is used to seal that hole, or it would change gas flow and crankcase volume negatively.
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