McCulloch Worm Gear Question

[Jason in TX]

PS - That Rube Goldberg setup is out of this world! My supercharger had original oil lines hooked up to it with the red paint still on them from the factory. I just matched the oil line size. My first drain back was too small and oil flowed out over the vent. I increased the drain back size and oil doesn't flow out the breather any more. It's still getting oil though because the gear box on the SC leaks!

 

[Dave/Green Bay]

Jason:
We have put a restriction in the oil line to reduce oil flow to the supercharger. We drilled a .030 hole in a plug and were still overflowing the supercharger. The plastic back piece we put on makes it very easy to see oil levels. We have even run it with a drill to simulate it running, this makes the oil empty much faster. The drain back is almost figures out with a 1/2" rubber tube.

There was an Allard with a McCulloch that raced at Road America and they were fouling plugs because the supercharger oil overflowed. Too much oil seems to be a problem with them.

Anyone running one that has figure it out your help would be greatly appreciated

Dave/Green Bay

 

[Dave/Green Bay]

We are having problems with the drain back from the supercharger to the engine. If there is anyone running a model 37 McCulloch with a working setup could you please post some pictures. Thanks in advance Dave/Green Bay

 

[Mike51Merc]

OK guys, for the uninformed casual observer, what's a Hobb?

 

[Dave/Green Bay]

Mike:

Wikipedia
"Hobbing is a machining process for gear cutting, cutting splines, and cutting sprockets on a hobbing machine, which is a special type of milling machine. The teeth or splines are progressively cut into the workpiece by a series of cuts made by a cutting tool called a hob. Compared to other gear forming processes it is relatively inexpensive but still quite accurate, thus it is used for a broad range of parts and quantities.[1]

It is the most widely used gear cutting process for creating spur and helical gears[2] and more gears are cut by hobbing than any other process since it is relatively quick and inexpensive.[3]

A type of skiving that is analogous to the hobbing of external gears can be applied to the cutting of internal gears, which are skived with a rotary cutter (rather than shaped or broached).[4]"

http://en.wikipedia.org/wiki/Hobbing

Dave/Green Bay

 

[Mike51Merc]

So, when you guys say that a Hobb needs to be created, it's kind of like a custom cutter for a particular cut? Hence "tool and die makers" are put to work.

 

[russcc]

Sorry, off topic, but looking at the Bridgeport photos reminded me I need a knee plate, (right angle) for my Bridgeport. Any ideas on used equipment dealers, most have them have dried up in the New England area along with the machine shops.

 

[Jason in TX]

Dave... I'm running one and have figured it out.

Video: (No Headers)
https://igcdn-videos-h-4-a.akamaihd...86-16/11090064_1574709569484304_7468858_n.mp4



Driving Video:
https://igcdn-videos-b-8-a.akamaihd...6-16/11175773_490492947766908_735294750_n.mp4



Leaving Lonestar Round Up:
https://igcdn-videos-d-0-a.akamaihd...16/11093207_1023473747665660_1598877909_n.mp4

 

[Dave/Green Bay]

Jason:
Very cool.

Can you post a close up picture of your oil return from the supercharger to the engine. In fact your complete oiling system for the supercharger,
Thanks Dave/Green Bay

 

[Dave/Green Bay]

After almost 2 years and a lot of patience the gears are done. A big thank you to Allied Gear in Green Bay and especially Ray the shop foreman. Allied makes runs of 300 to 500 gears so my project was not a priority

The plan is to run one of the new gears and save the original in case we need to make more at a later date. The supercharger just got back from power coating and we are mocking it up. If all go right we should be on the road this summer. Dave/Green Bay

 

[Dusters swe]

Has restored my 37F. The gears were good but the bushes were worn. So we had to make new. Took a lot of time to measure all the games. The vertical shaft was bent so it had to be straightened. Now it works fine! Have the serial No. 25th

 

[Dusters swe]

Did put a valve at the oil pressure. Couse when its cold I fill the blower whit oil. So I reduce the pressure when its coold and opend it up when its warm.

 

[Dave/Green Bay]

Latest update on McCulloch project. We have mocked up the supercharger with the new gear we made. Have run it in the lathe for 3 to 4 hours to make sure we are getting the pattern we expected. Things looked great so final assemble is in progress. We have found several modern day seals and bearing to replace originals and added a few new ones for better oil control. Hope to have it running early next year. Dave/Green Bay

 

[Ol' Ron]

Dave, what kind of boost do you expect. The most I've ever seen is 2-3 lbs, On the very I'e seen run.

 

[Dave/Green Bay]

Ol'Ron:
The McCulloch sales literature say 4.5. As long as it pumps some air and is reliable we've accomplish what we we're after. Walt's 40 with the McCulloch is what got this started years ago.
Dave/Green Bay

 

[Ol' Ron]

Have you ever worked on a Frenzel? My friend had on on his 276 but it didn't put out anything (1-2??) Beautiful unit tho.

 

[Dave/Green Bay]

Ol'Ron: I have only seen pictures, went to youtube and found this link. Looks similar to the supercharger they used on the shark nosed Graham.

https://www.youtube.com/watch?v=mRf4fZBVe7U

I looks like it is running off the belt. McCulloch also drives off crank belt but has the gears that increase RPM to make the supercharger spin faster than engine RPM. Have no idea about innards of the Frenzl. Makes a very neat looking setup