Fan housing, What’s the best way to clean and paint one. |
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Fan housing, What’s the best way to clean and paint one. |
jsaum |
Nov 24 2018, 06:29 PM
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#1
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Senior Member Group: Members Posts: 530 Joined: 12-June 07 From: Everett, WA Member No.: 7,809 Region Association: None |
I’m disassembling a 1.7 parts car engine and want to paint the fan housing for a future engine build. After a couple of hours of scrubbing and cleaning I can see metal underneath all of the caked on grease and oil! What’s the best next step cleaning and prepping process before paint? Is oven cleaner ok to use?
Thanks, Jsaum Attached thumbnail(s) |
914_7T3 |
Nov 24 2018, 07:00 PM
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#2
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Please forgive me, I'm new to all of this! Group: Members Posts: 1,853 Joined: 3-April 17 From: Los Angeles, CA Member No.: 20,991 Region Association: Southern California |
Have it tumble blasted, but do not paint. Anything that will inhibit heat dissipation should be avoided on air-cooled motors.
This one was tumble blasted and has returned to its original magnesium finish to tarnish again over time. |
bbrock |
Nov 24 2018, 08:14 PM
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#3
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914 Guru Group: Members Posts: 5,269 Joined: 17-February 17 From: Montana Member No.: 20,845 Region Association: Rocky Mountains |
Have it tumble blasted, but do not paint. Anything that will inhibit heat dissipation should be avoided on air-cooled motors. This one was tumble blasted and has returned to its original magnesium finish to tarnish again over time. Now I've learned something new today. Had to Google that one. Can you explain the benefit of tumble blasting as opposed to something like walnut blasting? |
914_7T3 |
Nov 24 2018, 08:35 PM
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#4
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Please forgive me, I'm new to all of this! Group: Members Posts: 1,853 Joined: 3-April 17 From: Los Angeles, CA Member No.: 20,991 Region Association: Southern California |
Have it tumble blasted, but do not paint. Anything that will inhibit heat dissipation should be avoided on air-cooled motors. This one was tumble blasted and has returned to its original magnesium finish to tarnish again over time. Now I've learned something new today. Had to Google that one. Can you explain the benefit of tumble blasting as opposed to something like walnut blasting? As per one of the tumbler manufacturer's website, "In tumble-blast batch processing machines, all surfaces of components are exposed to impact treatment as the parts gently turn over and over in a slowly rotating tilted basket. This design virtually eliminates component damage due to part-on-part impingement that is so common with “barrel-blast” machines. Our tilted basket generates greater circulation of components in the batch, which not only yields more thorough and uniform coverage, but also makes for a shorter blast cycle – typically five minutes or less!" My local supplier did not disclose the type of media used, however upon completion of the process, the pores of the magnesium are left closed. No need to seal it with clear or paint. |
URY914 |
Nov 24 2018, 08:40 PM
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#5
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I built the lightest 914 in the history of mankind. Group: Members Posts: 121,115 Joined: 3-February 03 From: Jacksonville, FL Member No.: 222 Region Association: None |
Easy-Off Oven Cleaner works well. And don't paint it.
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jsaum |
Nov 24 2018, 09:31 PM
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#6
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Senior Member Group: Members Posts: 530 Joined: 12-June 07 From: Everett, WA Member No.: 7,809 Region Association: None |
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rstover |
Nov 25 2018, 05:40 PM
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#7
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Member Group: Members Posts: 136 Joined: 15-November 11 From: Kerrville, TX Member No.: 13,785 Region Association: Southwest Region |
It is my understanding that cerakote will no hinder heat dissipation. This is a picture of one that I had cerakoted. I don't remember the color.
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mepstein |
Nov 25 2018, 06:04 PM
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#8
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914-6 GT in waiting Group: Members Posts: 19,324 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region |
Cerikote is good stuff. I’m not sure the fan housing gets hot. Isn’t it’s purpose to bring in fresh air? If so, it shouldn’t be getting hot.
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rstover |
Nov 25 2018, 06:25 PM
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#9
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Member Group: Members Posts: 136 Joined: 15-November 11 From: Kerrville, TX Member No.: 13,785 Region Association: Southwest Region |
Cerikote is good stuff. I’m not sure the fan housing gets hot. Isn’t it’s purpose to bring in fresh air? If so, it shouldn’t be getting hot. Some had mentioned not to paint or powder coat because heat would not dissipate. The cerakote to me is a good option. I believe there are many applications where cerakote is a very good option. I was shown the booth where he applied it and it had some serious fan and filter, it must be very toxic to apply. |
mepstein |
Nov 25 2018, 06:36 PM
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#10
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914-6 GT in waiting Group: Members Posts: 19,324 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region |
Cerikote is good stuff. I’m not sure the fan housing gets hot. Isn’t it’s purpose to bring in fresh air? If so, it shouldn’t be getting hot. Some had mentioned not to paint or powder coat because heat would not dissipate. The cerakote to me is a good option. I believe there are many applications where cerakote is a very good option. I was shown the booth where he applied it and it had some serious fan and filter, it must be very toxic to apply. Yes, you need a good respirator. |
jsaum |
Nov 25 2018, 10:40 PM
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#11
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Senior Member Group: Members Posts: 530 Joined: 12-June 07 From: Everett, WA Member No.: 7,809 Region Association: None |
Cerikote is good stuff. I’m not sure the fan housing gets hot. Isn’t it’s purpose to bring in fresh air? If so, it shouldn’t be getting hot. Some had mentioned not to paint or powder coat because heat would not dissipate. The cerakote to me is a good option. I believe there are many applications where cerakote is a very good option. I was shown the booth where he applied it and it had some serious fan and filter, it must be very toxic to apply. Yes, you need a good respirator. I googled it and found a shop a few miles away from me. I’ll give them a call and see how much they charge. |
IronHillRestorations |
Nov 26 2018, 07:28 AM
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#12
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I. I. R. C. Group: Members Posts: 6,732 Joined: 18-March 03 From: West TN Member No.: 439 Region Association: None |
It's an impeller (fan) housing and IMHO heat dissipation isn't a critical concern.
I've media blasted and painted several without a discernible change in engine temps. |
DRPHIL914 |
Nov 26 2018, 08:24 AM
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#13
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Dr. Phil Group: Members Posts: 5,769 Joined: 9-December 09 From: Bluffton, SC Member No.: 11,106 Region Association: South East States |
It's an impeller (fan) housing and IMHO heat dissipation isn't a critical concern. I've media blasted and painted several without a discernible change in engine temps. I agree, I have seen no increase in temp issue with my newly powdercoated fan housing, but powdercoating is thick and may effect the continuity of the ground for the alternator( I am having this issue) But temps are not an issue(oil or head temps) Phil |
mepstein |
Nov 26 2018, 08:57 AM
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#14
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914-6 GT in waiting Group: Members Posts: 19,324 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region |
It's an impeller (fan) housing and IMHO heat dissipation isn't a critical concern. I've media blasted and painted several without a discernible change in engine temps. That's what I thought. Mag is a pretty reactive metal and I wonder if paining actually increases its lifespan by slowing down corrosion. |
dr914@autoatlanta.com |
Nov 26 2018, 09:20 AM
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#15
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914 Guru Group: Members Posts: 7,900 Joined: 3-January 07 From: atlanta georgia Member No.: 7,418 Region Association: None |
totally agree no paint, will flake off after a while and look like crap. Also Porsche painted the sheetmetal black to dissipate the heat better than any other color
quote name='914_7T3' date='Nov 24 2018, 06:00 PM' post='2668357'] Have it tumble blasted, but do not paint. Anything that will inhibit heat dissipation should be avoided on air-cooled motors. This one was tumble blasted and has returned to its original magnesium finish to tarnish again over time. [/quote] |
914werke |
Nov 26 2018, 10:32 AM
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#16
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"I got blisters on me fingers" Group: Members Posts: 10,156 Joined: 22-March 03 From: USofA Member No.: 453 Region Association: Pacific Northwest |
It's an impeller (fan) housing and IMHO heat dissipation isn't a critical concern. I've media blasted and painted several without a discernible change in engine temps. (IMG:style_emoticons/default/agree.gif) James do whatever will protect it. If you want to shortcut the process I have both early & late housing already finished. BTW the Impeller housing was never bare as delivered. It WAS covered with some coating that gave it a slight iridescent gold color from the factory |
mepstein |
Nov 26 2018, 10:41 AM
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#17
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914-6 GT in waiting Group: Members Posts: 19,324 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region |
It's an impeller (fan) housing and IMHO heat dissipation isn't a critical concern. I've media blasted and painted several without a discernible change in engine temps. (IMG:style_emoticons/default/agree.gif) James do whatever will protect it. If you want to shortcut the process I have both early & late housing already finished. BTW the Impeller housing was never bare as delivered. It WAS covered with some coating that gave it a slight iridescent gold color from the factory Probably the same as the trans. |
914_teener |
Nov 26 2018, 10:53 AM
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#18
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914 Guru Group: Members Posts: 5,205 Joined: 31-August 08 From: So. Cal Member No.: 9,489 Region Association: Southern California |
It's an impeller (fan) housing and IMHO heat dissipation isn't a critical concern. I've media blasted and painted several without a discernible change in engine temps. (IMG:style_emoticons/default/agree.gif) James do whatever will protect it. If you want to shortcut the process I have both early & late housing already finished. BTW the Impeller housing was never bare as delivered. It WAS covered with some coating that gave it a slight iridescent gold color from the factory Probably the same as the trans. Yep. Probably some type of conversion coating that was found later to be environmentally un friendly later on. Only a quess. I know enough about metallurgy to be dangerous. |
IronHillRestorations |
Nov 26 2018, 01:26 PM
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#19
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I. I. R. C. Group: Members Posts: 6,732 Joined: 18-March 03 From: West TN Member No.: 439 Region Association: None |
I've used clear engine paint, and a Dupli-Color cast metal paint with good results. I like powder coating, but getting a jobber that can do quality work with a detailed cast alloy part like this would be the key.
Any coating can come off over time. It's usually the next 5-10 years that matter. If I went through the trouble and expense of getting one all cleaned up and tumble blasted or whatever, I'd put a protective coating on it. The magnesium alloy should be protected, IMHO. I think the factory used some type of Cosmoline like coating, but I've been wrong many times before. |
bbrock |
Nov 26 2018, 01:45 PM
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#20
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914 Guru Group: Members Posts: 5,269 Joined: 17-February 17 From: Montana Member No.: 20,845 Region Association: Rocky Mountains |
I think the factory used some type of Cosmoline like coating, but I've been wrong many times before. I don't know why, but I researched this when I started my resto. The stuff they used was Tectyl 846 which pretty much looks like Cosmoline to me. Like Cosmoline, I expect it to melt off and be gone in the first couple hundred miles. I think it was intended pretty much just to protect during shipping. Here's what it looks like on my block. (IMG:http://www.914world.com/bbs2/uploads/post-20845-1492440261.jpg) |
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