I wonder what the deck height becomes if you get JE's thermal barrier coating on the piston top? They must have information on that. I couldn't find it on their web site.with je pistons they've all been between 1 and 1.1m when i've checked them i think.
To me, what is valuable about these coatings is that they increase the thermal efficiency of the engine. This becomes even more important when the static CR is raised a lot by installing higher compression pistons. Obviously, when the static CR is raised, so is the waste heat. Unless the cooling capacity is increased, reduced engine life will result. So, installing JE 11:1 pistons in the 900 SS motor, from the oem 9.2:1 should make the engine run significantly hotter. With an air cooled motor, there are limited options for increasing the cooling capacity. You can't weld on bigger fins, for example. You can add a bigger oil cooler but the basic motor is not upgradeable in this way. Enter ceramic coatings. I believe they are a good choice for people wanting more power and long life from their engines.
Swain Tech has an independent test reported on their website:
"After coating, all parts were measured again and the motor was reassembled placing all parts in their original positions to eliminate the possibility of performance differences due to new or different parts. Reassembly confirmed that the coating thickness was thin enough that clearance provisions did not need to be made. After reassembly, the motor bolted to the same dyno in the same shop the initial pulls were recorded on. The results were exactly what you would expect based on years of Swain Tech’s independent dyno test on every type of motor from a basic 5 horse Briggs & Stratton Motor to motors that are found at the top levels of circle track, drag and road racing. With over 30 years of testing, we can confidently state you should realistically expect a 2-5% horsepower and torque gain on a motor with coated pistons and heads.
With no modifications other than the coatings, the dyno pulls clearly showed the torque and horsepower curves were much better. Both curves were fatter in the lower rpm ranges where it will improve the drive off corners, and both curves were flatter as well. Peak horsepower was up 2% from 318 to 324 horsepower and peak torque was up 5% from 320 lb/ft to 335 lb/ft. In the heart of the curves, these numbers were even more impressive. At 4,500 rpm, torque was up 7% from 298 lb/ft to 319 lb/ft. At 5,500 rpm, horsepower was up 6% from 302 to 320 horsepower. Most engine builders will take full advantage of the coating by making jetting (or computer), timing, and lighter weight oil for maximum power gains. However for this test, we wanted to document and publish the gains that are achieved if the only modification was coating the engine. If the proper tuning adjustments were made to take full advantage of the coatings, these results would have been even more impressive."
It's up to anyone to determine if this is worth their time and effort. On a stock Ducati 900 ie motor that makes 80 hp, we can expect maybe 2 hp more from coating the engine parts if nothing else is done.
Also, from Swain Tech:
"Internal engine and exhaust coatings are so widely depended on now that the questions
“Do coatings work?” or “Will it flake off?” are obsolete. Now people just want to know, “What should I realistically expect from coating my parts?” Swain Tech Coatings has always been the leader in engine and exhaust coatings. By developing specific coatings to improve internal engine and parts and professionally applying the coatings in a controlled environment, Swain Tech has earned a reputation for quality coatings with durability that is unmatched. Through the years, we have seen small coating shops start up with inferior materials and inflated claims. Some of the inferior materials are so basic they are sold as “do it yourself” coatings. The inferior materials tend to fail in service and the inflated claims cannot be delivered on. Both leave the customer feeling like they have been bitten by the old snake oil. Swain Tech’s professionally developed and applied coatings have been on the track and in the field-tested for over 30 years. The following is an independent, unbiased test that was conducted in cooperation with Circle Track magazine. The purpose of the test was to give engine builders and performance enthusiast a realistic presentation of power gains that should be expected with quality coatings on a high performance motor. "
So, buyer beware.
full article here: http://www.aera.org/ep/downloads/ep9/EPQ110_34-40.pdf