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Originally Posted by Regal
They have the injector position so that normal driving the o-ring won't see over 500F, but keep the engine close to redline for an extended time and that o-ring doesn't stand a chance regardless of timing during a shift.
There is more to this than we are being told. We need an o-ring made from asbestos or ceramic, not Teflon or an organic polymer, any after market vendors have this on their radar?. Teflon is a very poor choice. Makes you wonder if Toyota laid off their materials engineering group during the recession ?
Or we enthusiasts need to take a serious look at our head water temperatures, I'm guessing there is a water jacket right around that o-ring in the head. A better water pump/radiator & oil cooler may be the real fix for spirited driving.
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I had addressed this earlier in the thread, but I will bring it up again here.
I have several of the "other" direct injectors here at work on my desk, (we make upgraded pumps for DI motors among other DI solutions)
All gasoline direct injectors i have sampled (except the siemens provided bmw injectors) use very nearly identical injectors, all that changes is the orientation, spray pattern and mounting tabs. this goes for both the Denso and the Bosch injectors, they all use this Teflon band to seal to the head and all in the same location ours is neither closer or further away than any of the others.
Considerations not yet mentioned? perhaps the tolerances on the head are not as tight as the other manufacturers? if there is even .0003 more clearance in the diameter where this seals in the head, it could make all the difference in the world as far as heat transfer, and integrity of the seal.
Lets quit blaming the seal though, it hasn't been an issue in audi's Mazda's nissan's or chevy's yet....the problem lies elsewhere.
BTW you aren't gona find any ceramics that will stretch to get down into the relief where this seal sits.