Price?

RPM?

Thanks.  I haven't had much success with Cox quality in the past few decades.  I bought a batch of Sure Starts and didn't get much satisfaction.  I'm afraid Mr. Cox's personal touch is the missing link.  Maybe somebody will buy a Blue Bullet and restore my faith.

While I usually stick to older Cox engines myself I can say that these new Cox engines are made with cylinders that are ported the same as the late #4 TD cylinders and have an adequate SPI gap. That 5 fin head seen in the pic really bumps the compression too. I have one and had to add 3 shims to get it to run.

The reason Bernie (Cox International) can't give accurate RPM figures is every engine runs different so he just advertises an RPM band. I also know Bernie does indeed test run engines from his product line. I have also seen video of the "extreme" being test run and it turned over 19K easily.

Lastly, if the blue doesn't suit you just call CI up and tell him what you want color wise.

Hope that helps some.

Ron

Hello Ron,
The point is I don't want ANY fancy colours. It doesn't make the engines go any better! As for your comments about them having Cox TD style porting, well you may be technically correct. but TD pistons and cylinders they most definitely are NOT! They are simply Surestart parts with the bar between the slits machined out. There is no ground taper on the cylinder which is the real difference. As for spi, the piston skirt is simply machined off to suit. This combination gives a power boost, but they do NOT go anywhere near as well as a proper TD piston and cylinder. As for the 5 fin head, well many of us have been running the Galbreath head and Nelson plugs for a year or two now. These give a CR boost and the volume of the Nelson plug is so small that you don't get the usual drop in performance. This combo is still used for National free Flight Association competitions, I believe. I think that should tell you how good it is. Oh and by the way, I have yet to burn out a Nelson plug.
  I am very grateful to CI for providing Cox parts, I have spent a good few hundred dollars with them on buying bits and pieces to keep my fleet of Cox engines going! However their range of "New" engines holds zero attraction for me as they are both relatively expensive and they don't really go as well as a true TD based reedy.

Regards,

Andrew. 

Wayne,
I am just speaking for myself, I don't much rate the CI range of engines. If other people want to buy them, that is fine by me! It helps CI's profitability and that is a GOOD thing, because I can keep buying spares from them. So no quarrel with anyone, go right ahead and buy as many engines as you want, there isn't a downside to it, as far as I am concerned!
As to the "TD cylinders" on offer from CI, they fulfill all specs of a real TD Cylinder, EXCEPT it has no cylinder bore taper. This being so, they won't make as many rpm as the real thing. The taper is part of the performance increase. Tach a real TD cylinder on a reedy and then replace it with a CI TD cylinder, tach it again and you will have lost rpm! If you don't have any real TD pistons and cylinders then the CI version is better than none. I am lucky as I have a store of TD spares including p/cylinders, which I purchased many years ago. If I didn't have them, then I would buy the CI version, unfortunately they don't deliver the rpm of a real taper ground TD setup. Having said that you will be operating in a region where a reedy is getting close to self destruct! But if you want ultimate reedy performance then you will need a real TD P/ cylinder combo.
I am a fan of CI, must have spent a good few hundred dollars with them. Their service is absolutely outstanding. The only time I had a slight problem with a certain item, they responded at once and sorted it out. Their offering of "TD p/cylinders", is an excellent example of them trying to fill a need in the market. The fact that it will not run as well as a real TD cylinder, is not their fault. They have done the best they can with the means available to them

Regards,

Andrew.