Coatings
Coatings
Has anyone rebuilt their Cooper engine and had parts coated? How do you determine if the coating is worth the investment? Does coating on bearings, camshafts, etc. wear/flake off? Who did the coatings? How much did that process cost?
Please share insights.
Thanks, DR
Please share insights.
Thanks, DR
5th Gear
Joined: Mar 2018
Posts: 795
Likes: 122
From: SoCal
Most help to least help.
1. Piston skirts (anti-friction)
2. Piston head (thermal)
3. Combustion chamber (thermal)
4. Sub-zero "treating" (not a coating) transmission, differential gears and shafts, axle components (anti-friction and strength)
5. Bearings (anti-friction)
No cam or valve coatings. Though some coat the chamber side of the valve heads in the thermal coatings.
Mike
1. Piston skirts (anti-friction)
2. Piston head (thermal)
3. Combustion chamber (thermal)
4. Sub-zero "treating" (not a coating) transmission, differential gears and shafts, axle components (anti-friction and strength)
5. Bearings (anti-friction)
No cam or valve coatings. Though some coat the chamber side of the valve heads in the thermal coatings.
Mike
Most help to least help.
1. Piston skirts (anti-friction) - Normally a Dry Film coating, works well if properly applied, works on valve stems also.
2. Piston head (thermal) - Polyphen is the most common and works well. An engineer once asked me a good question about this "Why are you trying to protect the piston from heat, you have piston squirters for that?"
3. Combustion chamber (thermal) - Same as above, works on valve faces also
4. Sub-zero "treating" (not a coating) transmission, differential gears and shafts, axle components (anti-friction and strength) - Cryo treating is cheap and easy. REM/ISF or WPC treatment for gears is better than a dry film type coating for longevity purposes. I also use ISF on timing gears to reduce friction.
5. Bearings (anti-friction) - Dry Film coating, works great.
No cam or valve coatings. Though some coat the chamber side of the valve heads in the thermal coatings.
My current head has a Ti-N coating on the rocker shafts and once I decide on a cam I will do the Dry Film on the cam journals. You could do a variety of coatings on the cam lobes but I would probably opt for a WPC treatment for longevity.
1. Piston skirts (anti-friction) - Normally a Dry Film coating, works well if properly applied, works on valve stems also.
2. Piston head (thermal) - Polyphen is the most common and works well. An engineer once asked me a good question about this "Why are you trying to protect the piston from heat, you have piston squirters for that?"
3. Combustion chamber (thermal) - Same as above, works on valve faces also
4. Sub-zero "treating" (not a coating) transmission, differential gears and shafts, axle components (anti-friction and strength) - Cryo treating is cheap and easy. REM/ISF or WPC treatment for gears is better than a dry film type coating for longevity purposes. I also use ISF on timing gears to reduce friction.
5. Bearings (anti-friction) - Dry Film coating, works great.
No cam or valve coatings. Though some coat the chamber side of the valve heads in the thermal coatings.
My current head has a Ti-N coating on the rocker shafts and once I decide on a cam I will do the Dry Film on the cam journals. You could do a variety of coatings on the cam lobes but I would probably opt for a WPC treatment for longevity.
Last edited by downshift1; Aug 26, 2018 at 08:38 AM.
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