homebru hydro update

 Got the thing running this weekend

http://www.jeffersonfreestate.org/hh/

Its making much MUCH higher RPM and between 11.5 - 12.5 volts.  Still fine
tuning the jet angles, but that part is working great.  Man just a little
change in angle can make a big difference in power.

Still have shaft coupler issues.  Need to drill and tap the new coupler so
I can bolt them together.  The coupler wasn't designed to run virtical so I
kinda suspected it'd be a problem.  Its the only one I could find that
would transition from the GM alternator to 1/2 inch without having a
special coupler built.

Getting rid of the right angles and increasing the pipe diameter feeding
the jets made a huge difference.  That and I bored out the jets to 1/8th
inch and polished them on the inside. I think its as good as I can get for
now.

As for the shaft I have a plan to weld up a small support around it and add
a bearing if the cupler drill and tap doesn't fix the problem.

thats all!

-z

 
Interesting. Scrap the coupling. shorten the impeller shaft. Use a
boss on the impeller shaft drilled and tapped to replace the nut on
the alt shaft, screw directly to alt. Flat disc on shaft near boss to
act as water slinger to keep alt dry.

The closer the impeller to the alt the less need for further shaft
support. From the looks of it you could probably get the impeller
within two inches of the alt.

 bealiba@gmail.com wrote in


Yes that was the idea originally, but man.  Its been REALLY hard to find
anyone who can tap that GM 19mm fine thread.  No machine shop, no metal
working buddy of mine had that tap, or could even figure out where to
order it.  I had a coupler bored out to 19mm on one side and 1/2 inch on
the other, but it wasn't quite right on the money, and again at high RPM
it caused all kinds of vibration.

The other idea was to find a long nut that would thread onto the
alternator and then weld a 1/2 inch nut on that, so the shaft could just
be a long 1/2 inch bolt with the pelton wheel on the end, but again.. I
couldn't find one anywhere!

Those guys at Epicenter order the GM threaded couplers in bulk from a
speciality outfit.  To have them make just one for me would cost a lot
more than I want to spend at the moment.



yeah.  I may shorten the shaft.  I'd have to move the jets higher and so
on.  No reason to screw with that until I can get the coupler to work,
which I think it will.

I'll drill and tap three holes to keep it balanced and then i'll be able
to lock them together.  Then i'll run the tests again and see how much
shaft length and extra supports I'll need.  

Stupid GM threads though -- believe me thats been the hardest part of
this whole damn project!!!

thanks

-z

 z wrote:


Check here for taps & dies

http://www.victornet.com/cgi-bin/victor/productlist.html?subdepartments=Metric+Taps:602,902,604

 proulxcurry@sbcglobal.net wrote in


Oh. its 17 mm not 19mm (brain fart) I need with 1.25 thread pitch -- so
17mm 1.25 (20 tpi)

As I suspected the site you list has .5, 1, and 1.5 .. no 1.25 !!!

Its an odd one for sure man!