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 Briggs and stratton Model 5s Modification

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MasonMcK
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Lawren Wimberly
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PostSubject: Re: Briggs and stratton Model 5s Modification    Briggs and stratton Model 5s Modification  - Page 3 Icon_minitimeMarch 19th 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    Briggs and stratton Model 5s Modification  - Page 3 Icon_minitimeMarch 19th 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    Briggs and stratton Model 5s Modification  - Page 3 Icon_minitimeMarch 19th 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    Briggs and stratton Model 5s Modification  - Page 3 Icon_minitimeMarch 19th 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    Briggs and stratton Model 5s Modification  - Page 3 Icon_minitimeMarch 19th 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.
Briggs and stratton Model 5s Modification  - Page 3 97cc_h10

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.
Briggs and stratton Model 5s Modification  - Page 3 97cc_h11
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Lawren Wimberly
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PostSubject: Re: Briggs and stratton Model 5s Modification    Briggs and stratton Model 5s Modification  - Page 3 Icon_minitimeMarch 20th 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    Briggs and stratton Model 5s Modification  - Page 3 Icon_minitimeMarch 20th 2017, 12:27 pm

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mr.modified
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PostSubject: Re: Briggs and stratton Model 5s Modification    Briggs and stratton Model 5s Modification  - Page 3 Icon_minitimeJune 3rd 2017, 6:46 pm

Some testing to see how drilling the holes and plug hole would go. Drilled a pilot hole for the spark plug, then I milled a place for the plug gasket with an old wood bit. Works good, but I didn't bother getting it down far enough to be all the way smooth, since this head can't be used.
Briggs and stratton Model 5s Modification  - Page 3 Img_6111

One of the head bolt holes drilled out.
Briggs and stratton Model 5s Modification  - Page 3 Img_6113

Drilling the plug hole to the correct size before tapping. Most of the excess aluminum cut off. Finally got a small drill press at work now.
Briggs and stratton Model 5s Modification  - Page 3 Img_6114

Plug hole tapped and holes drilled, cleaned up all the edges. Makes a nice conversation piece for the shelf.
Briggs and stratton Model 5s Modification  - Page 3 Img_6110

1st attempt at a casting, 2nd attempt, and the real head. Soon I'll give it another try and see if I can get a usable part.
Briggs and stratton Model 5s Modification  - Page 3 Img_6112
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RichieRichOverdrive
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PostSubject: Re: Briggs and stratton Model 5s Modification    Briggs and stratton Model 5s Modification  - Page 3 Icon_minitimeJune 3rd 2017, 10:22 pm

Pretty sweet! I didn't know a spade bit could cut metal, cool! Where'd you get a tap for the spark plug hole?
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mr.modified
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PostSubject: Re: Briggs and stratton Model 5s Modification    Briggs and stratton Model 5s Modification  - Page 3 Icon_minitimeJune 4th 2017, 11:02 pm

Thanks, I think the plug tap came from Napa. Just a 14mm x 1.25 I think. The spade bit dulls quick but it takes some of the aluminum off at least. Just have to go easy on it.
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PostSubject: Re: Briggs and stratton Model 5s Modification    Briggs and stratton Model 5s Modification  - Page 3 Icon_minitimeAugust 1st 2017, 5:31 pm

Here's some video of my casting operations. Found out afterwards from a guy in the comments, that with lost wax casting, the wax is only used to produce a plaster mold for the aluminum. It's not supposed to be used directly in the sand as I tried to do. I didn't realize this, so next time I'll try it with some foam instead. No wonder it didn't melt the wax out of the way...   On the plus side, I am now able to melt down a good amount of aluminum and keep it fairly hot. So I'm very close to getting it to work.

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PostSubject: Re: Briggs and stratton Model 5s Modification    Briggs and stratton Model 5s Modification  - Page 3 Icon_minitimeAugust 1st 2017, 8:42 pm

Getting closer!! Yah, wax to make the mold and melt the wax out, then pour in the metal. Billet fin valve cover would be cool.
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PostSubject: Re: Briggs and stratton Model 5s Modification    Briggs and stratton Model 5s Modification  - Page 3 Icon_minitimeAugust 2nd 2017, 11:44 am

If I'm not to busy maybe this weekend I can make another attempt but with styrofoam this time. For the cylinder head I still need to make a better wooden form. Next time I try the head, I'll lay it right side up on a flat board with the form around it, pack the sand in, then flip it over and take the head out, like your supposed to. Then hopefully I will get a better mold that way.
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PostSubject: Re: Briggs and stratton Model 5s Modification    Briggs and stratton Model 5s Modification  - Page 3 Icon_minitimeDecember 26th 2017, 1:03 am

Doing some practicing with the milling machine. Working on a billet valve cover.

Briggs and stratton Model 5s Modification  - Page 3 Img_6512
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