Blower for The Demon V8

[Mosey]

Mosey want vroom, too!
vroom, vroom!

[stevehuckss396]

Mosey want vroom, too!
vroom, vroom!

 

[stevehuckss396]

Finally a little progress!

I have been tied up with maintaining other engines. The Peewee V4 now has a new distributor cap, rotor, and hall sensor. She's running real nice now. The V8 had a water pump burn up. My own fault. The first design had the coolant return hose right under the fill cap so when I run it the coolant sprays out the vent hole in the cap. The coolant got low and the pump got no lube so it is now a little loose.

One thing I didn't like about the old one is the fact that the body doubles as a bearing race. The body has to be made from bronze or brass. I am going to see how a pump with sealed bearings works. With ball bearings I should be able to get away with an aluminum pump. I also am making this one like a real pump in the sense that it draws water from the inlet and feeds coolant to both sides of the pump like a real one. I don't need it to do that but I may in the future. I figured I would make enough parts for 3 pumps. I need one for the V8, one for the blown V8 and one for spare parts.


The top piece is the back side of the pump. All the passages are milled into the back of the body. The lower piece is the front of the back plate. The back plate allows the pump to span the timing cover and carries the rear bearings.

[Mosey]

Great thinking. You've defined these pumps for everyone to follow.
Mosey

[ScroungerLee]

Steve, I have just caught up on this thread.  Fantastic work as always! 
One question, what software did you use to calculate the paths for cutting the lobes?  It seems to me that as the end of the mill is presented to the material at different angles as it moves over the lobe that some compensation must have been involved.  Is it a ball mill?

Thanks, lee

[stevehuckss396]

Steve, I have just caught up on this thread.  Fantastic work as always! 
One question, what software did you use to calculate the paths for cutting the lobes?  It seems to me that as the end of the mill is presented to the material at different angles as it moves over the lobe that some compensation must have been involved.  Is it a ball mill?

Thanks, lee

Yes it is a ball end mill. 1/8 inch I think. I used CamBam to generate the tool paths. I did a vertical 3D profile and let the tool walk down the part. Stepover was about .005 inch so the finish was real nice. I still had to do some hand polishing as my CNC machine is good to a few thou not a few tenths like the expensive machines.

[stevehuckss396]

Little more on the pump today. The rear plate and body are complete. I rounded off some corners to make it look different but I think I like the old style better.

Now I need to make me some guts.

[Don1966]

That looks great Steve, I really would lie to see it up close to see the size of it all.

Don

[ozzie46]

  Oh man, even polished it up. Way togo .

  Yeah I'd like to see it too. It's hard to get a feel for how big things are on the forum.


   After I get some thing done I'd like to get the plans for The Demon without blower.  I'd never be able to manually machine the blower.  I may even get the plans just to have them to drool over. 

  Ron

[stevehuckss396]

That looks great Steve, I really would lie to see it up close to see the size of it all.

Don

 
  Yeah I'd like to see it too. It's hard to get a feel for how big things are on the forum.

  Ron

Does this help?










How about this one?












Or my personal favorite.





Hope this helps.

[b.lindsey]

Beautiful  work Steve...I vote for your favorite too...

Bill

[stevehuckss396]

Beautiful  work Steve...I vote for your favorite too...

Bill

I have a feeling that one will get the most votes.

[Don1966]

That is awesome Steve, I like............ 


Don

[ozzie46]

  Now that Gives a good perspective. It's a good sized engine. Thanks Steve.


  Ron

[stevehuckss396]

I have finished the 2 shafts other than the fact that the drive shaft needs to be trimmed to length. On the old pump the shafts rode in a reamed hole so the case needed to be brass or bronze. Now the shafts ride in 1/8 X 1/4 inch bearings. The o ring seal has been moved to a small pocket in the rear of the front case. I still need to make a gasket but I have my trusty template so that should go fast and then an easy finish and it should be mounted tomorrow if life will allow. I'm in a bit of a hurry because I have a metal club meeting Wednesday and I'm trying to turn it into an engine run so I would like to be ready.