A Wallaby of my own.

[Maryak]

Great stuff Dave, 

I must say it's smaller than I imagined.

Bob

[steamer]

Thanks Bob!

Been gone a few days on business.   Hope to get more done this weekend.

Dave

[zeeprogrammer]

Nice pic Dave. Thanks for that. Helps me understand more what you're up to.

[steamer]

Thanks Zee!


Dave

[Bezalel]

Looking real nice Dave
I'm curious about the cutouts in the sump that fit around the bearing caps. I notice Pete did the same on his.
Bassed on  the Westbury drawings I have, It looks like ETW made the sump run up against the crank at both ends of the sump.  Is it possible he narrowed the bearing caps to achieve this?  Is that a viable option? (if not, it looks like am I up for making some new bearing caps?)   
 
Thanks for all the tips and keep feeding us photos, there great.  
 
Cheers
Bez

[steamer]

Hey Bez

I'll mark up my drawings wth what I end up doing and I'll pass them along to you.    His head cover drawing has a couple of issues too.

I've come to the conclusion that I am going to remodel everything to sort out any other suprises.

Everything is machining fine Bez!   Good castings!

Dave

[steamer]

OK....on the docket...


and my version of the head "hat".....


though I'm missing some dimensions......
Dave

[Bezalel]

Hi Dave
 
A really nice set of drawings.
 
Doing your own up in CAD is one sure way to gurantee the dimensions don't have any "Typographical errors".
 
I notice your drawing shows the exhaust port takes the longer path to exit the head. which runs it much closer to the plug recess and the head bolt hole than it would be if going t'otha way.   
 Is there a technical reason for this?        or is this one of those artistic licence things that makes each build a unique work of art?
 
Appreciate the feedback on the castings by the way,     
 
Bez

[steamer]

Hey Bez,

Well, if you go by the drawing, the head bolts are equidistant.  If I machine the exhaust passage to where it "appears" to be on the drawing, It is very likely I'll take out the head bolt with the passage!   so I offset the center bolts by .062".....and yes the rest is artistic license...the exhaust passage is the same distance wheather you exhaust out the carb side or the plug side by the way...the passage length is the same.    In my case, I'm using a 1/4-32 plug instead of a 3/8 plug, so I still have some additional distance between the exhaust and the plug, and by design, the exhaust valve stem and back of the valve cage is surrounded by coolant in the head, so thats the best you can hope for cooling a valve.   I think it will be alright....that and the fact I don't plan on entering it in the Paris-Dakar any time soon....
 
Dave

[steamer]

Hi Dave
 
A really nice set of drawings.
 
Doing your own up in CAD is one sure way to gurantee the dimensions don't have any "Typographical errors".
 

OH I wouldn't make that claim...lets say I've reduced the probability...I suspect there is still plenty of opportunity for me to stuff it up!

 

Dave

[Bezalel]

Thanks Dave
 

...the exhaust passage is the same distance wheather you exhaust out the carb side or the plug side by the way...

I'm not entirely convinced about that.... yet  ,  not that it really matters, as long as the exhaust has somewhere to go 
 
Thanks for sharing the build with us, I'm really enjoying it.
 
 
Bez 

[steamer]

Thanks Dave
 

...the exhaust passage is the same distance wheather you exhaust out the carb side or the plug side by the way...

I'm not entirely convinced about that.... yet  ,  not that it really matters, as long as the exhaust has somewhere to go 
 
Thanks for sharing the build with us, I'm really enjoying it.
 
 
Bez

Well....according to CAD it is...anyway.

Depends on where you center the arc, and what radius....I have it square to the outside edge, so on the edge.

Dave

[Bezalel]

I'm looking forward to seeing you make the final cut, that's a cunning plan you have there.

[steamer]

Hi Bez,

Me too!....I need to make the valve cages first...

Dave

[steamer]

OK....we progress!

The Head fixture.

My son has been working on his layout skills!.....but first we squared up a 1/2" thick piece of Cast Aluminum jig plate.


The some layout work....with Papa's help....




He asked a couple of pointed questions....I don't see you lay out parts much?....to which I said ...yes ...but I should!...and I want you to at least understand how and why.

He got to use his own tools by the way.

Next up is to tram the mill head...and try out my new drill chuck!.....lots of holes to drill!

Dave