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From the pictures it looks like there is a sleeve on the motor shaft and then a threaded extension shaft in the sleeve. If there is a sleeve, is the attachment to the motor shaft interference or set screw?

The required interference fit to hold 15 Kw at 50000 rpm is not real big. 20 microns (0.000787") is plenty. Tolerance range is something like +/- 0.0005". Too little interence and couplng will slip. Too much and won't be able to assemble just by heating the sleeve. Need a lathe with digital...

I ran the above cam specs with a 70 mm TB, Honda short runner, factory volume intake and small tube headers with an open exhaust. These assumptions gave: 268 flywheel HP/ 228 WHP @ 8000 rpm and 183/155 ft-lbs @ 7500 rpm With an LSA of 102 degrees DynoSim gives 112 degrees of overlap...

My bad. I think I was way off on the inlet valve opening. Playing with that the volumteric efficiencies have come back in line. The model is making more power so now having to play with intake and exhaust to get power back in line with predicted.

I ran DynoSim5 with the following: bore - 86 mm (assumed 1 mm overbore to get 1.9L) stroke - 82 mm 4 valve pent roof head wth race porting 29.65 mm exhaust vale 35.15 mm intake valve 14:1 compression 100% ethanol with 7.7 A/F (no E85 option) Honda type standard runner, large volume intake...

What is the lift on the cams? Also what is duration at 0" lift and 0.05" lift

Tell me as much as you can about your engine particularly the cams and I will model it in Dynosim5 software. I have modeled a 2.6L GM Quad 4 with an Eaton M62. That engine has is high VE with a 4 valve head. Dynosime predicts 300 hp with 10 psi of boost at 6000 rpm. The Maytech motor is 18...

Since you are wanting to near double the HP you are going to need near double the mass air flow rate. You are probably looking at 15 psi of boost. If your engine is high compression to start, then pump gas is not going to cut it octane wise. Maybe E85 or race fuel. With a pressure ratio of...

I calculated the flow for a 1" orifice based on 6.3 psig discharge pressure and got 175 cfm. This is right on the surge line for a Vortech with Si trim. I assumed the discharge temperature was 155 'F based on the compressor map and 72 'F inlet temperature. Since the system is at ambient...

FYI, an orifice with an thickness to diameter ratio of 0.2 will indicate about 8% higher flow at the same pressure drop than an orifice with a T/D of 0.93. Not huge but the orifice thickness does make a difference.

I read up on BLDC phase current and agree that it's not possible to get power to the compressor from the phase current. So it would be interesting to know the battery current. The P2 compressor curve is fairly flat and doesn't fall off until you get to higher flow rates. Below is the data for...

Assuming 48 volts, a phase current of 115 amps and a motor efficiency of 90%, the power input to the compressor would be: 48* 115 * 1.732 * 0.9 = 8.6 kW Based on the Vortech V2 Si compressor map, the discharge pressure should be about 6.6 psig at 29,000 rpm. At 68% efficiency the air flow...

A Rotrex C15 is the right size for a small engine but they are a bit spendy ~$2000. For a cheap option I think that salvaging the compressor side from a used turbo is worth investigating. Both these options will require some machining - not sure how well equipped your shop is or if you...

McMaster-Carr has T5 belts and pulleys

These are Lithium Titanate or LTO. They can be bought on Alibaba.com. Yinlong is another brand for LTO batteries.

S Is the outer race of the bearing sliding back and forth? One would thinkl there there would be something like a circ clip to keep the bearing in place or maybe a thrust bearing.

I did exchange a couple of more emails with APD and detailed my design parameters: 5-15 seconds runs with 50% duty cycle 1 second spool up time 240 amp compressor load at full speed (10,000 motor rpms) 90 amp compressor load at motor initial start-up 40 amps additional for inertial acceleration...

McMaster-Carr sells an 80mm by 80mm muffin fan that puts out 130 cfm. It draws 3A running on 12V DC. If the APD ESC was enclosed in an 80mm by 80mm by 125mm box with the fan at the end, the air flow would be over 10 m/s.

Got an immediate response back from APD. They said that the APD Pro was intended for airplanes and that they would have concern about vibration when used in a car (personally I would think that a model airplane would have more vibrations than a car). I asked if the vibration concern was unique...

I posed the cooling question by e-mail to APD and let's see what they have to say. That's a litmus test for me. Do they respond? Do they seem to provide an intelligent answer? For example, I called Speedmaster who seems to be associated with PCE and asked if they have compressor map for the...