I think that a 10% discount is what they do alot of time for things, so...it isn't too huge. Considering the cost in shipping (guessing these would all be shipped together), your savings through them may be offset in shipping. Not sure. A discount is better than no discount though! As for my pistons. Well, to start off with, I guess I should explain "why" I had my pistons coated. For one thing, this motor was built for fuel and boost...and power as a result. I wanted to modified the stock CR and had my pistons machined (as you can see in my build thread in the TDI forums). A common problem...or rather, if a TDI piston is going to fail, it would crack around the "lip" area after sustained high boost, fuel and therfore temps. I had the lip removed as the most efficient way to reduce the CR of the motor in general and also relieve the piston of this potential problem. It reduced CR without toying with the all important "squish". Having been in contact with Marc back when he had his TDI motor's pistons coated and reading alot about SWAIN myself, I knew that this was the next step. The biggest advantage to me is how the coatings help to DULL the dipertion of heat THROUGH the piston first of all. In non-coated pistons there is alot of heat that can be lost through the top of the piston and just contributes to overall engine temp and eventually is absorbed into the engine coolant, etc. That in my opinion is lost energy and potential power. The coatings keep the heat where it needs to be and evenly disperses the heat across the top of the piston (and in my cases, in the combustion chamber as well). The benefits I believe are numerous for this and in the end, a slightly more efficient engine. Not to mention, with the coatings and the lower CR I'm able to run much more boost/fuel if I want compared to how comfortable I would be "at stock" My pistons after coatings...The benefits that I've seen thus far? Well, since I didn't have the mTDI up and running prior to ever modifying the pistons I don't have a lot of good baselines, but I can tell you that my EGT's are lower, more level and consistent. I don't believe I've seen much in the way of spooling improvement and that would be hard to gauge given my motor setup and the fact that I'm using a turbo that does spool indeed a bit later being that it has a .48 A/R hot side. With the lower CR, I'll naturally have a "longer" warm up cycle with the mTDI, however...I believe the coatings also accelerate the time it takes the car to warm up. If your looking for power advantages, etc. etc. out of the coatings...I don't know if you'll find them in doing the pistons alone, but it does in the long run keep the heat WHERE it needs to be and therefore less heat/power loss through the motor where it just becomes wasted energy. In my opinion, its a good idea of having preventative insurance for running lots of boost and fuel. Makes me have a certain piece of mind. I have more observations...but I just woke up...so, let me know if you want more specific info. Joe
Topic: Swain Tech group buy (Read 7253 times)
