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I was thinking to coat the inside of the throttle body with Cerakote but now concerned about adhesion on the inside. The prep steps are to sand blast with aluminum oxide or garnet equivalent to a 100 - 120 mesh size.
Rob, there is a huge range of Cerakote air cure colors, I just picked the metals that interested me. I am not interested in red, golds, greens, pink or purples in my engine bay.
I agree as with anything it is all in the prep work. Although cerakote seems to be a wonderful product. That is a very fine grit they want you to use it will leave a relatively smooth surface. If cerakote holds up as well as it does on guns I expect it will be safe but I would be careful.
Here is my fan just freshly blasted with that sized aluminum oxide. It is a very smooth surface but it started that way.
You can see the before in post #386. My Dremel tools arrived today. I purchased a little kit of sanding flapper wheels. 80 grit and 120 grit. So tonight, put on my safety glasses, N95 shop masks (purchased before Covid 19 situation) and got to work on the throttle body.
Tonight I started with the 80 grit and another much more aggressive sanding barrel I have in my Dremel kit. First time I used the flexible extension tool with my Dremel and it was made for this job. You create a lot of magnesium dust and I used my shop vac the whole time inside the throttle body while sanding which key the dust to a minimum.
This is the result after my first pass with 80 grit flapper wheel and the more aggressive sanding barrel to help to smoothly shape right at the inlet of the small and large throttle body inlet ports. That was my favorite part to correct in order to create two smooth inlet ports there. I will probably complete one more pass with 120 grit flapper wheel and stop. I do have smaller flapper wheels of 240 grit. I have believe going to mirror finish on intakes is not ideal and I do intend to then sandblast with 100 grit Garnett sand as part of my Cerakote prep. Leaning heavily towards coating the inside. If I prep properly I believe I will get good adhesion of the Cerakote.
I am not sure this will make a damn bit of difference but when this is all done and my C4 is finally running again, I will take satisfaction in knowing my intake air molecules are flowing nicely inside the throttle body.
I don't have bearings (Global Power via Amazon screwed up so bad, that they are now sending me 4 of each bearing type for free, but not here yet)
- a local distributor also has these bearings on order for me. I will end up with a backup set to use on my C2 if I keep the same intake
- I plan to heat up the throttle body in the oven, put the bearings in the freezer and see if I can gently tap them in (worked great for my alternator fan bearing).
I just ordered the Cerakote colors I want and also a 25lb bucket of 100 grit garnet sand to sand blast outside with my cheap $18 sand blast gun
My airbrush parts arrived. I will spray at 30psi with a 0.75mm needle. You know I am not shy about sharing photos on progress.
Tonight, I will go over my intake with 120grit flapper wheel. I only took off the very top surface black oxide around the flaps so hopefully I haven't screwed up my idle.
A bit more sanding tonight and I am finished. Most of it by hand to 240 and then 400 grit in some spots. Goal is not a mirror finish. Now I need to wait on my 100 grit garnet sand to show up to sand blast this thing.
I just went to SKF website and found a local distributor. I can send my extra set over to you when it arrives. I think I will have both sets next week.
No progress here. I can’t find the bearings in japan. Where was it that you guys ordered them?
I got mine at 123Bearings.com out of France. Shipping was a bit on the high end but they shipped same day. Bonus, they actually had the larger on with 2 seals as well, ie the 2RS version.
This came up in another thread but a helpful reference for others. From my 1991 C2 Tiptronic, USA car compliant with California Emissions it says on this sticker. 964 006 109 05 Same sticker on my USA 1990 C4
05-11-2020, 09:34 PM
