The proof is in. Don't EVER paint a supercharger. - Page 3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Forced Induction All questions and problems regarding Superchargers, Turbos, NOS, ZEX, intercoolers, water injection, etc.

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Old 03-18-2007, 08:31 PM   #21
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And all those superchargers would have run cooler without paint.
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Old 03-19-2007, 11:09 AM   #22
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Quote:
Originally Posted by Sol
Quote:
Originally Posted by willwren
Reasons the M90'* are typically not coated:

1. Engine cover hides all but the nosedrive, which is painted.
2. Nosedrive is probably also painted to ease cleaning belt dust off it.
3. Coating is expensive.
4. Coating isn't as necessary on the M90, as it spins slower to produce the same boost-and should run cooler.
5. Coating and curing costs time in assembly.

Save labor and money. The bottom line.
Well, reason I ask these questions is because there are a lot of M90 powered cars running very fast times, which have painted or powdercoated blowers.
And like I've been telling them for 4 years, put a non-coated/non-painted blower on there and they will go faster.
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Old 03-19-2007, 11:30 AM   #23
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Here'* the graph again and the raw data to go with it, as it'* not really easy to tell from the graphs what the actual temp differentials are:

Name:  mystery.jpg
Views: 39
Size:  39.0 KB

Black OEM
348 347
322 310
264 253
218 202
182 171
168 155
153 140
142 129
132 119
121 111
116 105
111 98
105 86
99 89


Mystery OEM
346 347
295 304
242 248
189 202
169 176
153 162
137 145
128 134
120 126
112 119
105 112
100 107
94 100
91 96
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Old 03-19-2007, 11:34 AM   #24
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The M90 on my 96 L67 is coated like an M62. It is the only one I've ever seen like that, but then again it'* the only 96 L67 I've ever seen. My 98 GTPs M90 wasn't coated.
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Old 03-19-2007, 11:36 AM   #25
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Quote:
Originally Posted by willwren
Mystery OEM
346 347
295 304
242 248
189 202
169 176
153 162
137 145
128 134
120 126
112 119
105 112
100 107
94 100
91 96
Wow, you've got me extremely curious...a paint or coating type that dissipates heat? Hmmm...
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Old 03-19-2007, 11:47 AM   #26
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Must be made of copper or something...
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Old 03-19-2007, 01:37 PM   #27
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Funny you did this. I had been thinking about it since that other post where Boost said to never paint a */C.

Did you do the test with that infrared gun? I would give it a try with a contact thermometer. Those infrared gun readings can vary from surface to surface.

I'd put my $ on a flat black coating working the best; and flat being better than glossy.

I'd also be curious vs a polished */c. I don't think polished would be good for cooling.
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Old 03-19-2007, 01:40 PM   #28
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is that por15?
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Old 03-19-2007, 01:56 PM   #29
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Quote:
Originally Posted by rogers
is that por15?
Huh? Who are you asking what about?

And Chinski, EACH SINGLE data point is an average of three 1/4" diameter measurement points, and my non-contact thermometer is calibrated by a very good lab. I have resources at my disposal that most don't.

Keep in mind also, the the 'mystery' coating would have performed better had the whole SC been coated with it. The entire SC would have cooled quicker.

The same is true for the black engine paint on the other end. Had the entire SC been coated with it, the results would have been far worse.
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Old 03-19-2007, 02:28 PM   #30
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Its not the quality of the calibration, it is what it is calibrated to. They are calibrated to a certain finish type'* properties. So if you are taking readings on a different finish type it can be off. We use those at work, I have seen the differences. I'm just saying give it a try. Mignt not be much of a difference or might be a few degrees.
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