Welcome back.
This is a follow-up to a video.
Where I run the see-through Wankel rotary engine.
Full Throttle a few times just for fun.
To see what happens.
And if you haven't seen that engine yet.
Here it is right here.
If this is your first time seeing the see-through rotary.
There's a full episode on this engine.
Where I slow things way down.
So you can see just how the Wankel combustion process works.
In action.
There is a link to that episode.
In the description area below.
Now in the last video.
I was just comparing some cameras and having some fun.
I just so happen to pick this engine as the subject for the test.
But this time I'm going to be doing something.
A lot of people asked for.
Full Throttle and hold it there.
To see what The maximum rpm is That this engine will produce.
This is my prototype and I really don't want to blow it up.
Will it Blow?.
Let's find out.
To measure the RPM.
I'm going to be using this non-contact digital tachometer.
Since this engine doesn't have any ignition components to hook a tachometer to.
Find a way to measure the RPM.
And this is the digital tachometer that I found.
That works the best.
Had the best reviews.
And was inexpensive.
So if you're interested in buying one of these.
I left a link in the description below.
Because it works surprisingly well.
The way this works is.
You put a little piece of reflective tape on the flywheel or moving part.
You just point the tachometer at the moving part while the engine is running.
You pull the trigger.
And it gives you the RPM.
It's as simple as that.
Let's go.
So there you go it stopped running.
And I'm not sure if that was because of the Heat or the high RPM.
But it cracked my transparent side cover.
I'm not sure if you would consider that blowing the engine.
I guess if you were in an RX-7 and the side cover cracked open
that would probably be blowing your engine.
But in this case yeah it cracked my transparent cover.
This engine has about 600 runs on it.
And now it just cracked.
So that's pretty impressive for me.
Apparently this engine blew before the Briggs & Stratton.
Alright so in this run.
This is essentially the maximum rpm I got out of it.
22388 RPM.
In the previous run I got about 23,000.
so what in going to do now is i'm going to
Lean the mixture out a bit and let's try again.
29000 RPM that is insane.
I almost can't believe my eyes.
To the point that I'm doubting the accuracy of this tachometer.
So what I'm going to do next to make sure this tachometer is accurate.
I'm going to go to my car.
The reflective tape on the harmonic balancer and start the car up.
And verify if this tachometer is as accurate as I hope it is.
Alright so the car is warmed up.
We're at about six or seven hundred RPM.
So there you go that's about 600 and something RPM.
That matches the tachometer in the car.
That is pretty dead on accurate so I guess our tachometer is accurate.
I still feel that that RPM number is ridiculously high.
So what I'm going to do is follow up by shooting some footage with the high speed camera.
To verify that that number is in fact correct.
That's the last of the fuel.
I just still think it's high.
And here's the math behind that.
We have 29000 revolutions per minute.
Divided by 60 Seconds.
Equals 483.33 revolutions per second.
The high-speed footage was shot at 3000 frames per second.
Divide that by 483.33 revolutions per second.
Which equals 6.2 frames per Revolution.
If we look at the footage that we shot with the high-speed camera and count the frames.
We go 1 2 3 4 5 and 6, that lines up more or less with one revolution.
This verifies our 29,000 RPM, numbers don't lie.
2 amazing things happen today.
the non contact tachometer was dead on accurate.
Which was surprising to me.
And the see-through rotary engine hit 29000 RPM.
I still find that mind-blowing and I'm sure, hopefully you did too.
Thanks for watching don't forget to check out the links to the full episode below.
And that's about it.
See you in the next video.