Quote:
Originally Posted by MetroMPG
Nice. I like how the bar insert spreads the load plus mates the pulley to the motor shaft.
What about the plastic material characteristics around heat? Water pumps pump hot water you know.  |
Yeah, the water pump will be an interesting one. Wikipedia says ABS is good to 176F, other sources I've seen say its good to 190F. That is a huge difference when your engine runs at 185-190F. I may just bolt a pulley on it and see how it does.
If it softens I do have a couple backup ideas. That first idea is to make some sort of aluminum heatsink plate and/or insulator between the pulley and the water pump. I imagine the heatsink would look somewhat like a front brake rotor with an internal centrifugal fan design to keep it cool. If that isn't enough, I can add an insulating plate (nylon cutting board) between the pulley and heatsink and I'm pretty sure that would work out very well. Perhaps just the insulator would be needed? I'm not sure yet. Here is a visual example of what I'm thinking about.
Another idea I've used before is to make a mold with the 3d printer. With the mold I can pour a 2 part urethane part. The urethane can hold up to engine temps without any problem at all.