Tom Parkes,
MSD gave me a good deal on a knock sensor so I am going to loan it
to you for testing as you are the only one I know flying a turbo
rotary right at the moment.

It has both visual and audible warnings of combustion knock.
I suggest you mount it on the forward rotor ( as mounted in a tractor)
as that tends to run hotter than the other two on a three rotor.

Send me your shipping address by private email.

Paul Lamar

Paul, do you think the MSD knock sensor will work on the 13b.  Where
would you install the sensor.
Seems it is adjustable, do you know how to adjust it for the 13b.

Thanks

Rino

Yes I think it will work.
Not yet. I have not received it yet. Any day. Late model rotor housings
have knock sensor mounting bosses just above the top spark plug. Tom's three rotor
has these mounting bosses.

My best guess on adjusting it is run the engine flat out at static RPM
and have someone hit the rotor housing with a hammer to simulate knock
as the frequency spectrum of the knock sound is determined by the natural
resonant frequency of the rotor housing. Adjust it until the red light
just comes on under this condition.

What do you think of this adjusting idea Todd Ryden?

Paul Lamar

Todd Ryden wrote:

I'd say that would be a good way to start your testing!

I thought about it some more and the best way to adapt the MSD knock sensor
to the rotary is get a metric bolt that screws into the rotor housing,
cut it off and weld it to the MSD adapter shown here screwed onto the
MSD knock sensor. The MSD adapter that came with my unit does not fit
the Mazda thread. Perhaps MSD can supply this in the future.

BTW if anybody has a Mazda knock sensor they don't need I'll buy it from
you. Or If you want to keep it perhaps you will loan it to me so I can
test it with the MSD display.

Paul Lamar
 
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