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 Briggs and stratton Model 5s Modification

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Lawren Wimberly
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PostSubject: Re: Briggs and stratton Model 5s Modification    Sun Mar 19, 2017 8:49 am

This may help brother... easiest furnace there is

http://www.backyardmetalcasting.com/book_fp.html
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MatthewD
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PostSubject: Re: Briggs and stratton Model 5s Modification    Sun Mar 19, 2017 11:00 am

That casting is pretty good. It has more definition than I thought it would.
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mr.modified
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PostSubject: Re: Briggs and stratton Model 5s Modification    Sun Mar 19, 2017 8:53 pm

Thanks lawren, probably going to make something better pretty soon before I try this again. I have some 12 volt car heater blower motors that I could rig up as a fan. I think it would work out nice if I can just get everything right at the same time. I think I could cast something smaller than the head using this method fairly easy. Maybe a finned valve spring cover. If I can find some styrofoam I might try a lost foam casting for that.

The other thing for this project is, I still don't know where I can get someone to mill me out a rod. I'm pretty sure I am going to buy a small milling machine soon, or a lathe, or both. It would be really nice for working on aluminum heads and things like this. In the past I've tried some stuff by hand but it takes hours.
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Lawren Wimberly
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PostSubject: Re: Briggs and stratton Model 5s Modification    Sun Mar 19, 2017 10:10 pm

a piece of plate glass, some 3m spray adhesive, and some sandpaper works wonders for making nice flat mating surfaces
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mr.modified
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PostSubject: Re: Briggs and stratton Model 5s Modification    Sun Mar 19, 2017 11:03 pm

I know it's doable, I did the opposed heads for my gtr project that way. Just takes a really long time. Also, I'd like to be able to mill out the combustion chamber, spark plug gasket surface, and tops of the head bolt holes. Then I could make a bunch of these if I wanted, or even make an entire billet head if I bought a block of aluminum.

Here's a head from a chinese engine I cut a lot off of, then I had to make room for the valves to open.


I did the areas over the valves with a dremel. It worked but it was time consuming and left a rough surface. Took a lot of checking to get it just right. With the mill I could cut those spots out no problem and have a nice smooth finish. With the 5s head, I want to do something similar, I was thinking when the valve is at full lift, have the bottom of the valve flush with the head. In other words, the valve will be up in a circular cut out in the head. Might not be a good idea though, maybe it would collect a lot of carbon in that area because of it's being recessed and probably cooler than the rest of the head.
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Lawren Wimberly
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PostSubject: Re: Briggs and stratton Model 5s Modification    Mon Mar 20, 2017 12:12 pm

oh I'm not dissing on the usefulness of a mill, I set up a cross slide on my drill press for light work. when I get set up up there, I'm planning on using a 6 cyl engine block for a mill bed, and a 4 cyl block for the mill head... the perfect 90 degree milled surfaces make for a great start to a DIY mill
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Lawren Wimberly
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PostSubject: Re: Briggs and stratton Model 5s Modification    Mon Mar 20, 2017 12:27 pm

https://www.youtube.com/watch?v=eurX6r83X3w
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