Ben Baltrusaitis wrote:

It looks like the Renesis is going to really get rung out next year. 
The Formula Mazda is getting a whole new car and will run
the Renesis instead of the 13B. The 13B was run from 5500 
to a rev limited 6600-this in the previous Formula Mazda. The power
band was set that high with torque falling off rapidly below 
5500. It was run mostly on road courses with a 5 speed
transmission.
I am sure we will see a high revving power band in the new 
Pro Formula Mazda. It has a 6 speed transmission and will run on some
ovals.
Don't you think the r&d will be great for us for aircraft use?

http://www.texasautosports.com/ProCar.html

Ben

Not directly but any experience with the engine helps.
We are unlikely to run ours over 7700 RPM for any length
of time. The highest gear ratio PSRU anybody is using or talking
about building is only 2.85:1. If you impose a 2700 RPM prop
limit (diameter) that converts to a 7700 engine limit.

Ken Welter on the other hand has a 3:1 belt reduction unit
so his engine RPM would be 8,100 RPM with a 2700 RPM prop. I'll bet 
Ken can hardly wait to get his hands on a Renesis engine :)

If you cut the prop diameter down a bit, run it at 3000 RPM and 
use a 2.85:1 gear box that will give you an engine RPM of 8550 and close
to 260 HP without the car intake manifold (Simple tuned manifold for 8500 RPM). 
That would make a great cross country air racer engine. 

One of the other differences compared to road racing is the engine never
runs at a constants RPM in road racing. It is always cycling between 
torque peak at 6000 and red line at 8500. It is unlikely to do this
for more than about two hours total at any one race weekend.
Ten races a year 20 hours a year. Five four hour flights.

Paul Lamar

 
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