Home » Public Forums » GMCnet » Electric powered altitude compensation blower
| Electric powered altitude compensation blower [message #175808] |
Fri, 06 July 2012 19:14  |
habbyguy
Messages: 896
Registered: May 2012
Location: Mesa, AZ
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OK, I'm probably opening up a big can o' worms here. Up front, I'll say that I fully understand that the "electric superchargers" on the market are almost entirely scams that probably slow down air flow rather than improving it. I'd thought through this before, and realized there's just no good way to put enough 12VDC through a motor to get enough boost to matter, especially not with something that fits under the hood of any of my cars.
Then I end up with a vehicle with not only cavernous empty spaces around the engine, but that has 120VAC available. Not only that, but since it's got a carb instead of fuel injection, it's going to lose power at high altitude. My feeble mind rolls all these issues around for a while, and then starts plotting.
I'm no expert on fan theory, but it looks like it just might be possible to boost a 403ci motor enough to matter at altitude (I'm not looking for "more power", just for keeping what I've got when driving at higher altitudes, which I plan to do frequently). That's done on some aircraft as well, where the only goal is to keep the sea level performance at cruising altitude (not to make heaps of power at sea level).
A fan like this one: https://www.grainger.com/Grainger/DAYTON-PSC-Blower-1TDU2?Pid=search seems to have the stones to push a fair amount of air at a reasonable amount of extra pressure. I did a crude extrapolation of the numbers (which I admit is a SWAG at best) and came up with something like a pressure of 3 inches of mercury at 650cfm (the limit of my carb). I also read that you have to apply a factor of about 1.5x to a fan's rating if you're using at 10,000 feet (presumably because it's easier to compress thinner air). Based on all that (and allowing that my numbers might be WAY off), I guess that - assuming not much loss in the system - that I could maintain the performance the motor has at 5,000 when I'm driving at 10,000 feet.
If so... whoo hoo!  Obviously, I'd only use this when my foot is planted on the floor and I'm struggling up a nasty grade.
The other reason I chose that motor is because my 1,000 watt inverter (soon to be installed) should drive it nicely, and also because the alternator could just about keep up with the need, too.
So - if anyone out there is well-versed in fan design, pressure, and all things aerodynamic, please feel free to throw cold water all over me. I could use it... it's triple digits here!
Mark Hickey
Mesa, AZ
1978 Royale Center Kitchen
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