The Jalopy Journal
Discussion in 'The Hokey Ass Message Board' started by Speed Gems, Sep 30, 2019.
I noticed in reading the last 2 pages that maybe some info might be helpful for some of the readers. This page will tell you about the absolute beginning of Roots blowers: https://en.wikipedia.org/wiki/Roots_Blower_Company
The original version was a 2 lobe rotor. It's design was to move volume and not achieve high amounts of pressure. I have never researched to see who developed the 3 lobe rotor such as the GMC design. The concept of "supercharger" reflects on pushing more than the vacuum pulled air charge into the engine. Hence, supercharge. The terms: blower, huffer, wind pump all reflect to the same principle of compressing the atmosphere to get more air flow into the engine. The guys in the pits call them blowers. Rules makers call them superchargers. Makes no difference if it's a roots, a centrifugal or a turbocharger. They all do the same end result. One other point, all roots design units are also referred to as positive displacement units. They are measured by swept volume of rotation in size. The 4/71 was designed to feed 4 cylinders of 71 cubic inches each. I know that most of you are aware of these facts. This was just meant to help those who are new to this.
Studebaker guru Malcolm Berry just got his supercharged Stude flathead 6 running ! It sounds like an airplane !!
Here is one I picked up years ago; any one know the application?
Number on tag is 2502 13821. Three lobe, about 3.5 long by 3.5 diameter
Seb, non automotive is my guess. You may know this but Bob McCulloch was the inventor of the McCulloch supercharger. His middle name was Paxton and one of his spinoff companies was called Paxton that was later bought by Studebaker. He's responsible for the Mac chainsaw engines used in go kart racing. He started Pueblo West Colorado. He was instrumental in the development of Lake Havasu Az. in which he was responsible for purchasing London bridge and moving it there. He died in 1977 after leaving a tremendous legacy in the high performance world.
wfo, yes not automotive but still sucked air thru a carb [gasoline I think] and blew to a single cylinder 4cycle air cooled flathead engine and something else. Can't think of what to call the assembly right now, looked military.. Just read about McColloch last night, interesting man. There is a couple of the mac kart engine blocks on e bay.
I love them side draft carbs!!!....
Check this out Bruce @GearheadsQCE
My Uncles (RIP) car, "Dodie 77" .
Fins are going the wrong way
How can volumne cubic inches be found? As simple as blocking off one side and filling with lite oil but I keep thinking it has to be rotated too?
I'm getting close
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That has to be the longest blower drive I've ever seen!
Only other one I have seen for a Caddy. Have had mine since 75.
Let’s see some pics
Chrome don’t get ya home
GOT SOME, WILL TRY TO POST SOME.
Poly block with a Potvin setup. Image stolen from @Deuces in the Potvin hemi builders thread.
Dig the Carter YH carbs
Can you figure out if the mixture goes in the side of the case or up and into that "box" above them?
where would i begin research on something like this? Bangers? thanks
Seb, your question about measurement: math would be how I would go about it. To use liquid, it would be best to pull and end cover. Grease the rotor lips to seal to the case as best you can an fill with a buret just like checking a cylinder head for volume with the rotor turned to the best position to seal. You will find many places to leak in doing this.
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