http://i770.photobucket.com/albums/x.../DSCN2215s.jpg
Printable View
Hi Steve
How did you line-bore the bearings? With the axis vertical, in a mill large enough to span the height of the job pluss the length of the tool, pluss clearance?
I used a boring bar. The bore is 4.935 thru the block so i let 5.250 of bar hang out of the boring head. The travel on Z is only 5 inches so I would bore 4.800 deep then raise the knee until it broke thru and then lower the knee and back out. Was a bit of a pain but that is all i have to work with.Quote:
Originally Posted by dynosor
http://i770.photobucket.com/albums/x.../DSCN2212s.jpg
Steve,
How are you going to machine the crankshaft?
Your work is totally awesome.
Jeff...
Thank you!!Quote:
Originally Posted by jalessi
The crank will be alot like this one i made for a V4 only a little longer. It will be turned on the lathe and alot of work will be done on the milling machine also.
http://i770.photobucket.com/albums/x.../DSCN1408s.jpg
Steve,
What alloy did you make the block out of? It looks like 6061. The machining seems very cleanly cut, suggesting it is not like the gummy 6061 one often gets from common material suppliers.
Are you going to run the crank in removable bearing shells, or directly in the block?
What material, hardness and finishing method will you use for the crankshaft?
Do you drill oiling channels in the crank and or block, or will this engine run on a 2-stoke fuel oil mix?
Thanks for sharing!
The block is 6061-T6. I make everything from 6061.Quote:
Originally Posted by dynosor
The crank will have 3 shell bearings in the center and ball bearings on the ends.
I will turn the crankshaft from a bar of 0-1 tool steel (drill rod). The main and rod journals will be polished with some 1000 grit paper. No hardening.
The lower end is oiled using a splash system like a Briggs Stratton engine. Every now and again the valve covers will need to be removed to lobe the rockers and lifters.
Not ideal but the goal was to make it easier to build for someone with small machines and limited skills. Everybody seems to want to build a V8 but the choice of plans is very limited and some are very complex. This one will be about a simple as it gets.
I think for now the block is done. I still need to drill the hole for the distributor but i'm going to wait and drill thru the manifold and block at the same time. It just hit me how small this thing is.
http://i770.photobucket.com/albums/x.../DSCN2230s.jpg
http://i770.photobucket.com/albums/x.../DSCN2233s.jpg
Steve,
How many hours do you have invested so far?
Jeff...
I don't keep track. If I had to guess it would be 20-30?Quote:
Originally Posted by jalessi
Where are you with plans for sale?
I would guess 6 month away. I really need to build this thing 100% before I offer anything to somebody else. I have already made a change to the head that would have been useless otherwise. When I am reasonably sure the plans are sound, I'll try to get some good drawings together.Quote:
Originally Posted by hercules
Quote:
Originally Posted by neilw20
Easier, but not cheaper.
I have been playing around and I think I will try to reproduce the Engine on http://www.weberprecision.com/. I have modeled the pistons, rods and working on the block. I am just designing as I go so we will see how it works out.
http://www.cnczone.com/gallery/data/...um/Engine1.JPG
Quote:
Originally Posted by eartaker
What size bore and stroke are you going to make it? Will it be big like the original weber?
Right now looking at a 1" bore 1" stroke giving me 6.28ci or 102.9cc.