Technical > Matt Shaff's Engine Shop

moderate blower od

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wideopen231:
hope its gas powered or your going to need L O N G  drop cord.

Paul New:

--- Quote from: wideopen231 on May 11, 2016, 01:59:13 PM ---Not really setting up for it right now. But will check those I knew pump and od had limit not compression.Nostalgia thing would be more show stuff or show/race.If there was more nostalgia stuff close I would worry more about rule deal and can always make change if need.

                                                                                                      Thanks

--- End quote ---

I kind of misinformed you with the compression, you can only get away with so much compression and OD with the limited pump to keep from burning up pistons.

dreracecar:
Most blowers max out at boost till cavatation happens, OD just determends how quickly it comes up to full boost.  I ran mine at 5 over and 20 over and both times it maxed at 24pounds

wideopen231:
YEA WE RAN 13.5:1 IN THE ALKY CAR FOR WHILE BUT FOUND OUT 12.5 WAS EASIER ON PARTS and ran faster. That was with 14-71 at 54% and 42# and with whipple at 54% max allowe and was making 44 lbs but was cooler air temp due to almost zero friction with screw blower.that was also with a 20 gpm pump and 13gpm to motor system which is almost twice whats allowed in nostalgia. i know some of the new 6-71 can build almost as much boost,but with them some of the pressure is from heat and thats not oxygen just hot air.

Those dang old peterbuilt blowers are ok ,but they are not screw blower by no means.Then screw blowers are not allowed.LOL

dreracecar:
With a blower and alcohol, inlet port temp only see's 64* , so heat from the blower is a non-issue unless running gas.

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