Powder coat /diamond cut

This is something I am considering since the bike is already apart. I have already sent the cylinders out to get machined. Will this effect the cylinders if I have them powder coated after being machined? I have read a lot of the post on here about this and very mixed opinions on this.
 

semi

Active Member
It was my understanding that you must do the Powder first due to the High heat for up to several hours can distort the Cylinders. Had Mine Powder coated, Diamond cut and then Cylinder work done in that order...
 

john sachs

Well-Known Member
It was my understanding that you must do the Powder first due to the High heat for up to several hours can distort the Cylinders. Had Mine Powder coated, Diamond cut and then Cylinder work done in that order...
That's proper. :2thumbs: Any other way, and you're flirting with a potential problem. :bang:
John
 
That's proper. :2thumbs: Any other way, and you're flirting with a potential problem. :bang:
John
I called the shop that is working with the cylinders, they have not done the machining yet, I have decided not to powdercoat. just getting the heads and cylinders polished and diamond cut .
 

joey1158

Member
It was my understanding that you must do the Powder first due to the High heat for up to several hours can distort the Cylinders. Had Mine Powder coated, Diamond cut and then Cylinder work done in that order...
Will the pistons and valves need to be replaced once any work has been done after powder coating? Anything else need replacing?
Not sure of the process for boring/honing entails. Is there a 'standard' for boring out that S&S engine and therefore 'standard' pistons for replacement are available or is everything 'custom'?
 

FLCRO

Member
Will the pistons and valves need to be replaced once any work has been done after powder coating? Anything else need replacing?
Not sure of the process for boring/honing entails. Is there a 'standard' for boring out that S&S engine and therefore 'standard' pistons for replacement are available or is everything 'custom'?
Joe,
I'm just getting my cylinders and heads back from the powder coater (this afternoon). What I was told (after I did this) was that it is very likely that the cylinders would get warped...and that I would need to go up a size in pistons. Had I known this first, I'm sure I would not have powdercoated them...

I'm not sure about the answers to the rest of your post, but I'll let you know if, in fact, I end up needing to chage pistons.
 

joey1158

Member
Joe,
I'm just getting my cylinders and heads back from the powder coater (this afternoon). What I was told (after I did this) was that it is very likely that the cylinders would get warped...and that I would need to go up a size in pistons. Had I known this first, I'm sure I would not have powdercoated them...

I'm not sure about the answers to the rest of your post, but I'll let you know if, in fact, I end up needing to chage pistons.
FLCRO, to me that would make for an interesting story. To see what all is really involved in getting the cylinders and heads powder coated. The investment in powder coating to start with and your satisfaction with that, then any additional changes after the fact. That cost, too. Curious as to if you are also getting the cylinders and heads diamond cut? Also, how long the powder coating takes before you get your cylinders and heads back and then the time out you'll need to take if you have more work to be done on the engine. Maybe it's worthwhile. Winter would obviously be the best time to do this. The total cost is something I'm sure most of us are unaware of. And finally the overall satisfaction of the final product.
 
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Joe,
I'm just getting my cylinders and heads back from the powder coater (this afternoon). What I was told (after I did this) was that it is very likely that the cylinders would get warped...and that I would need to go up a size in pistons. Had I known this first, I'm sure I would not have powdercoated them...

I'm not sure about the answers to the rest of your post, but I'll let you know if, in fact, I end up needing to chage pistons.
I decided to powdercoat first then send the heads outs to get diamond cut. Not sure about the cyclinders getting warped. I am getting mine honed to clean up the cylinders and finish up the top end rebuild.
 

RCAdd1ct

JAFO
I asked S&S about this. They told me to do the PK and diamond cut, then refinish the cylinders. Depending on what you find will dictate if you need new pistons and rings.

I guess if you are doing all this it would be worth it to redo it all and have a nice fit for the new parts.
 

Coolbreeze

Active Member
I've done about 10 sets of heads & cylnders for customer over the last 4 years. Including doing my own this past spring. Not a problem with one set. Don't over think it guys!
 

JeffM

Active Member
Strongly agree with the "BREEZE".

The amount of heat may distort thin material but not cylinder head, they get hotter bolted to the bike than they do in an oven.

I have powder coated dozens of heads and barrells on various motors not even 1 micron of distortion.

So go for it.
Please provide before and after shots and a cost summary would be nice.

Cheers
Jeffm
 
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