Hello Brett,

Yes, I do understand the principle and that's why I mentioned the pressure differential , all I'm saying is I really doubt it can be cavitation, not denying the pump damage, which I attribute to be a pump adjusted on the lean side on very hot days, a pump can be on the lean side but and the top end of the engine can be on the rich side.

The thing is, I don't think is right to say there's a design problem causing cavitation and damaging the pump, that's an affirmation, which is really hard to prove in this specific case, and the reason is there are many many people who don't have that problem even on similar operating conditions, that's all.

Bob,

I think you are right with what you summarized as the necessary improvements, but I do not belive in the cavitaion assetment and that's because I do understand the principle and the values of the variables are too small, some negligible, and I guess you might agree with me in that you will keep believing is cavitation and I will not, so maybe is better to leave the way it is, because we both think we are correct!



Yamada has always made improvements based on previous engine versions, so they pretty much are an evolution of the previous design, I mentioned before even the 160 pump and the 170 looks the same, they are completely different on the inside, and the change was done so the engine could operate in hotter environments, and nobody made a comment, so I wonder if people knew that, the 175 pump is an evolution of the 170, and so on with the next engine, Amram is retrofitting the 175 pump on the 170 and it will be very interesting to know what the engine performance will be(can't wait), and I know Amram will share the information soon.

When a design change is made, they have to evaluate the operators, not just the engine, and that's why are several 175's out to be tested in different conditions, but those who get this engines are really experienced on YS, and sometimes things like the problem in this thread will not happen to those people and the design will not be compensated for certain situations. The fact they take so long to get an engine out clearly demonstrates their commitment to the product, I don't think that anybody realizes the complexity of the market better than the Yamadas, they don't want to loose more ground to electric, but electric is way much simpler and pretty much foolproof, even though I so Jason S. have dead stick in a competition we had in Colombia during practice, I thought I will never see that but it can definitely happen.

Let's see what the new data will provide,

Regards to all

P.D. This is a great thread, we disagree in certain things and still remain respectful to everybody, I wish more people could do that. Hope to see you guys some day in the field like in the USA 2011 worlds, we will need beer for that!!