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Where did you find a 7.980mm reamer?

were you using an adjustable reamer?

My first suspicion would be imbalance or an alignment problem causing the rotor to flex a bit. If you want to stick with direct drive, I'd follow matnrach's guidance.

I think I calculated the interference at about 0.0008" with a tolerance of +/- 0.0005" for an 8 mm shaft. I would set the compound at a very shallow angle to the shaft and use it advance the bit. Making cuts of a few ten thousandths with the micrometer dial on the cross slide is will be tough.

Because the operating curve for the P2 is so flat in the regime that small engines will operate in, a spring operated blow -off valve will not work. It will have to be electronically actuated and controlled by TPS and or RPMs.

I'd be suspicious that vibration is what killed the motor.

You can see that the voltage drop is inversely proportional to the amps. I don't know what gauge your wires are but an 8 volty drop would be way too much for 8 gauge wires. Maybe there are poor soldered connections or bad plug in connectors that are causing the excessive voltage drop.

Curious on what motor you are running and if you know compressor RPMs during the run

The KVs on BLDC motors are generally based on "no load". There will always be some droop when load is placed on the motor. The equation of interest is: Back EMF = Motor Phase EMF - amps * motor internal resistance EMF is basically voltage Back EMF opposes the motor phase EMF and that's why...

Congrats on breaking the 10 second barrier. Are you running a belt drive on the Sledgehammer? There's more to be had from the P2 wheel if you can get the speed up some.

Here is the design process for a RC airplane: 1) decide what propeller to run based on what plane you have 2) pick a motor that matches the operating window for the propeller 3) pick an ESC what will handle what the motor will demand 4) pick a battery pack It's the same for an electric...

And just for grins, To make 1000 flywheel hp: Vortech V-7 JT-B compressor 17 psi of boost 93 hp to drive compressor (69 kW)

I ran a boosted case in DynoSim with a Vortech Si trim supercharger. I adjusted the pulley ratio to get 6.8 psi of boost at 6500 rpm. I specified an intercooler efficiency to get 140 'F MAT. This resulted in 679 hp which includes the parasitic load of the supercharger. I checked the power...

DynoSim5 is one level of enhancement up from Desktop Dyno. There are two more levels of enhancement; DynoSim6 and Dynomation6. Pricing is: DynoSim5 - $70 DynoSim6 - $150 Dynomation6 - $500 I checked out Pipemax and it looks like its strength is in header design although it also does engine...

Changed the cam duration to 280/292 with 116 LSA. Played with the cam timing. It liked opening the intake later and got most HP at 117 intake centerline. Valve overlap was 54 degrees. This resulted in 516 HP at 6500 rpm and 481 ft-lbs at 5000 rpm. This was at sea level with 90 'F and 50%...

I had to guess at the valve size and assumed 2.05" and 1.6". Also had to guess at cam timing and assumed the intake vale centerline at 106 degrees ATDC. DynoSim5 likes seat to seat cam duration and I assumed 260 and 276. With these assumptions, I got the following for naturally aspirated...

With the compressor wheel that you have selected the speed needs to be limited to about 58,000 rpm to limit boost to 7 psi. The motor you have selected has a KV of 2400. That means with 100% throttle and no load the motor will turn at about 79,000 rpm with 33 volt supply. Under load...

6 volts of drop from the battery to the ESC is very high. For 3 feet of 8 gauge it should be less than 1 volt for 71 amps. Also recognize that because the ESC is throttling (reducing the phase voltage to control speed) the phase amperage to the motor is considerably higher than 71 amps. 33.2...

Alex, since you have dyno data, I would be very interested in modeling your engine in DynoSim5 just to see how much the program can be trusted. If you want to do this, let me know and I'll publish what input data is required.

From what I know about GM knock sensors some have standalone electronics and some have the electronics in the ECM/PCM. The electronics are engine specific.