powder paint the engine ?

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JKO
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powder paint the engine ?

#1 Post by JKO » Thu Sep 20, 2018 9:17 am

Is it a good idea to powder paint the engine, or should it be wet painted?
Jesper Kofoed
Ducati 748S
Suzuki GS500E Electric 5 Kwh battery
Yamaha RD500

Twinsport
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Re: powder paint the engine ?

#2 Post by Twinsport » Fri Oct 05, 2018 3:04 am

Jesper,
JKO wrote:Is it a good idea to powder paint the engine, or should it be wet painted?
In my opinion powder coating is always the last choice. Can't think of any advantages other than price.

Another thing: Since we are roughly in the same pastorate we should meet someday. Interrested?

/Steen
If I had a signature, it would be good.

steveho
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Re: powder paint the engine ?

#3 Post by steveho » Fri Oct 05, 2018 1:22 pm

Sorry, couldn’t disagree more.
Power coating, if done properly (with a phosphate primer) is super durable, chip resistant, thick film thickness, temperature resistant (not exhaust temps) and is affordable. Being ‘baked on’ achieves this. Granted, poor powder coating is crap and a PITA. You need to find a good vendor who understands motorcycle parts (not just industrial) and masks properly.

Picking up some satin black parts for my resto RD500 tomorrow......
I have engine casings powder coated on air cooled RD’s and the finish is superb. Don’t quite get the bad vibes? :???:
RD400F, with Dave Freist (RIP) carb mods
TDR250 special, carbon, lighter, faster!
Harley Wide Glide, 103 cubes of torque
YZR500 Replica, Latest passion. A money pit!!! A keeper!
Latest purchase, RD500 in Marlboro colours! A project....

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silverstrom
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Re: powder paint the engine ?

#4 Post by silverstrom » Fri Oct 05, 2018 2:42 pm

One issue that has been raised with powder coating engine parts is heat retention. The primary concern is that powder coated cylinders to not dissipate heat as well as painted cylinders. Something to consider when making your decision, particularly with respect to the rear cylinders, which are plenty hot to start with.
1985 RZ500 1GE Spec
1985 RZ500 47X Spec Project Bike
1986 RG500 ATR
1986 NS400R
1987 TZR250
1988 Honda RC31
1990 TDR250 Pre-Production # 000001
2007 DL650 VStrom
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steveho
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Re: powder paint the engine ?

#5 Post by steveho » Fri Oct 05, 2018 4:34 pm

Good point Silverstrom. Never considered that.
Whilst I agree with the concept, I can only really see it applying mainly to air-cooled engines. Water-cooled RD/RZ’500 only would have the powder coat on the external surfaces, with the more effective cooling still active where the factory designed it. But, as the cooling on the rear cylinders is marginal, ‘every little helps’. :grin:
RD400F, with Dave Freist (RIP) carb mods
TDR250 special, carbon, lighter, faster!
Harley Wide Glide, 103 cubes of torque
YZR500 Replica, Latest passion. A money pit!!! A keeper!
Latest purchase, RD500 in Marlboro colours! A project....

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Re: powder paint the engine ?

#6 Post by Twinsport » Tue Oct 09, 2018 3:26 am

Hi again,
steveho wrote:Sorry, couldn’t disagree more.
Power coating, if done properly (with a phosphate primer) is super durable, chip resistant, thick film thickness, temperature resistant (not exhaust temps) and is affordable. Being ‘baked on’ achieves this. Granted, poor powder coating is crap and a PITA. You need to find a good vendor who understands motorcycle parts (not just industrial) and masks properly.
You are of course correct - strictly speaking. The issue is that many vendors make crappy work and that it's very problematic to remove the powdercoating once things go wrong. Not many of us put many miles on these bikes, so is the (maybe) added durability worth the risk of having powder coating made? It will last a long time before you know if the quality of the coating is good or not - and if it's bad, you will have a hell of a job removing the powder coating.

I know that powder coating is popular, but unfortunately I see a lot of bad work too. These bikes are going up in price and originality is sought after. Why just not stay with the "original" type of paint when restoring?

Maybe I'm just fuzzy? I have a collection of elderly bikes and when restoring I am always using the type of paint that was used in that period. It ensures an original look and different types of paint flows differently along edges etc.

/Steen
If I had a signature, it would be good.

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pstamper
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Re: powder paint the engine ?

#7 Post by pstamper » Tue Oct 09, 2018 11:46 pm

I painted with POR 15 product. paint still great after, let us say a lot of track time. It is all about the prep. Not done right forget what ever paint you use.

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