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Ahh, that is good advice and makes sense now that I think about it. First of all, I am still working on the mechanical coupling of the motor and compressor, so I like the idea of limiting the RPMs a bit. This will give the electrical system (motor, ESC, and batteries) a harder work out while I...

Great questions and calculations. Castle tech service warned me to never run the motor without load, as it would surpass its 90K self destruct RPM limit and the rotor would fly apart. I think that they said the most they ran it on was something like 36 volt power supply, which calculates to...

I paid the extra money bought the blue tooth adaptor for the Hobbywing max4 ESC. I am using the built in data logging function on the ESC. I configured it for a 4 pole motor. So I can see amps, voltage, RPM, temp as a function of time in the run and map out the correlation. Pretty slick. Just...

I received the headway LiFePO4 cells, holder, and battery management system today all for less than $200 including shipping. I had my boys test the voltage of each cell with a volt meter and line them all up in order. The holder that I got was $15 and holds 24 cells and has solid copper bus...

Good question. There seems to be very little end float. I think it is mostly a combination of the nut loosening due to fast deceleration and flex in the back plate. I am still waiting on my laser sintered stainless shaft and hopefully they works for me. Here is the update. I will start a build...

I love the video. Thanks for capturing the build. I have watched it several times. And it has been helpful to me.

The 3D printing is a pretty cool approach to get the design right and right up my alley as I already have this capability. It opened up the possibility for me to get started with my design and build without the big commitment and cost to get metal parts made. I have gone through multiple...

Cool, did your engine come with a knock sensor or did you add one? If after market, do you have any guidance? I have a spot to plug it in on my Holley Terminator X and would love to enable the function for the ECU to be able to take out timing if there is any knock. Then I can use that timing...

Thanks for sharing, I’d like to understand the potential pitfalls better. So, how much boost did you have that blew up pistons? And what was the compression ratio of the engine? Folks who are building opel engines had similar problem when using mismatched camshaft. The cylinder pressures would...

Thank you for all of the thinking here. It is a lot to ponder and a lot to learn. I did get this back from Hobbywing tech service regarding the Hobbywing max4 ESC. I noted in their specs that you should not run a motor over 600KV at 12A. So I asked if it could run a castle 1721 2400KV motor at...

Thank you for the reply. Well that is interesting indeed. What is the max RPM you have hit with the HW Max4? 40K? 50K? 60K? 70K? 80K Motor RPM? If using a 4 pole motor, do we get the eRPM by multiplying by motor pole count? So for my 4 poled motor 80K motor RPM x 4 poles = 320,000 eRPM? I am...

For the direct drive option, I have a GT3582, which I believe is what WB is using and pretty similar to one of the versions of T4OE.

So, I am trying to figure out if I made a bonehead move and purchased an incompatible motor Castle 1722 and ESC (hobbywing MAX4). I bought the castle because of the high RPM (rated at 90,000 max RPM 2400 KV motor at 8S) and want to run it in the 70,000+ RPM range. I bought the castle MAX4...

I hope that works out. I have a boring bar, but don’t think that I could work with that type of precision. I am going to explore another route. I have my 3D CAD design complete and am going to have the extension shaft done in laser sintered stainless steel. I did this once before for a valve...

I am after low RPM torque too. High RPM horsepower is about ability to sustain a high speed. For me torque is about acceleration I am planning to back off on my timing significantly at first and perhaps run a tad bit richer on my target Air Fuel Ratio. I will also reprogram my Holley Handheld...

How about the Hobbywing Max4 ESC? Did you blow that up too or has that stood the test of time? Maybe I fell under the halo effect of the blog title "holy grail". Mine Hobbywing Max4 was just delivered yesterday and still has the plastic wrapper on it. Is it a good bet for delivering something...

Did anyone ever build a LiFEPO4 battery for electrified boost? I currently am favorably dispositioned towards an array of headway batteries, mostly because of the cost. Here is why I think that I like them: Cheap (~ $5.50 ea used for 8Ah) Screw connections! Relatively safe for cars High...

The battery cable was not that expensive on the hobbywing website, only $5. But that did not have any shipping options under $10. The same adaptor was also available from eBay for $10 free shipping but shipping from China.

It’s good to see you back WB! Thank you for the update and including some video footage of your build. It has been helpful for me to think through my design!

I love the pictures, they have been helpful as I am modeling out my design. Thank you