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  Briggs Opposed Build 46ci

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Doug
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TheBeal
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Stretch44875
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PostSubject: Re: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci - Page 2 Icon_minitimeSeptember 12th 2014, 12:48 pm

Mentioned it before, but you can make your pushrods out of brake line, and reuse the ends. They haveto be hollow, oil is pumped up them to lube rockers and valves.
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TheBeal
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PostSubject: Re: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci - Page 2 Icon_minitimeSeptember 12th 2014, 12:55 pm

Different...

No means to machine anything at all?
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redlinemotorsportts
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PostSubject: Re: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci - Page 2 Icon_minitimeSeptember 12th 2014, 1:26 pm

Stretch44875 wrote:
Mentioned it before, but you can make your pushrods out of brake line, and reuse the ends.  They haveto be hollow, oil is pumped up them to lube rockers and valves.  
The intek pushrods are solid. I'm going to try and make a lifter from valve stem, taking the springs out of the original valve.

TheBeal wrote:
no means to machine anything at all?
There isn't much to machine. I think I can fit the block vertical in the drill press to drill the holes. Mostly covers, lifters, pushrods, head bolts, and maybe some slight cam grind due to rocker arm ratio, so the valves open at the right time.


I'm going to search for a pressure lube base so I can lube the valve train better.
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TheBeal
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PostSubject: Re: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci - Page 2 Icon_minitimeSeptember 12th 2014, 2:41 pm

Eeeg. Make sure your drill press is true and the bearings are good.
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LAWN MOWER MUDDER
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PostSubject: Re: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci - Page 2 Icon_minitimeSeptember 12th 2014, 2:47 pm

If it helps I have an 18 HP briggs diamond series Full pressure lube oppy....

With a giant hole in the side of it....
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redlinemotorsportts
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PostSubject: Re: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci - Page 2 Icon_minitimeSeptember 12th 2014, 3:08 pm

LAWN MOWER MUDDER wrote:
If it helps I have an 18 HP briggs diamond series Full pressure lube oppy....

With a giant hole in the side of it....
Hmmm. I'll search myself but if I come up dry i might give you a shout
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LAWN MOWER MUDDER
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PostSubject: Re: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci - Page 2 Icon_minitimeSeptember 12th 2014, 3:56 pm

redlinemotorsportts wrote:
LAWN MOWER MUDDER wrote:
If it helps I have an 18 HP briggs diamond series Full pressure lube oppy....

With a giant hole in the side of it....
Hmmm. I'll search myself but if I come up dry i might give you a shout

Well that hole is patched with the material that came out of it and it is stuck back together with some kind of glue. It's not silicone and its not JB Weld, so I honestly aint sure. Worst case scenario I can mail the connectors and adapters for it to you and you could probably compare the blocks and with machining stuff you can probably mill stuff and drill stuff and get it to mount. I looked and it has what looks to be lines to the cooler but the cooler is missing. I'm sure another one (like from a V-Twin) could work.
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redlinemotorsportts
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PostSubject: Re: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci - Page 2 Icon_minitimeSeptember 12th 2014, 5:31 pm

Oh, I just want the base, right? Or is the hole in the base (lower case) because I think that would bolt up. Not sure
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PostSubject: Re: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci - Page 2 Icon_minitimeSeptember 16th 2014, 8:26 pm

Valve springs. Boring pics but should help someone in the next ten years lol. Never seen them before, just showing lubrication and lifters. How to get the oil from there to the intek head is the question! Suggestions? Two lines into the valve covor? Remove valve guide seals?
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TheBeal
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PostSubject: Re: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci - Page 2 Icon_minitimeSeptember 16th 2014, 11:03 pm

Since your going through all the effort, might aswell make it a horizontal shaft! Very Happy
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PostSubject: Re: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci - Page 2 Icon_minitimeSeptember 16th 2014, 11:12 pm

"T" into the oil drain tube, get a small 12 volt pump and run a line to each valve cover. how to get it out, i dont know
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PostSubject: Re: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci - Page 2 Icon_minitimeSeptember 17th 2014, 8:58 am

I don't want to mess with pumps really, I think it will get it there itself. But good idea.

Beal, I could do that. But I have no use for a horizontal. I was thinking about making a mini bike around this engine if it runs dependiy.

Figured out what I'm going to do so the head gasket doesn't blow into where the valve holes are. Just going to measure some stuff today, gunna be a pic heavy thread with lots of info.
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PostSubject: Re: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci - Page 2 Icon_minitimeSeptember 17th 2014, 10:02 am

I would like to see an oppy or v twin converted to horizontal... or even a larger single cyl.
I seen a few small 3.5 or something turned horizontal.
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1997 Murray
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PostSubject: Re: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci - Page 2 Icon_minitimeSeptember 17th 2014, 10:17 am

willis923 wrote:
"T" into the oil drain tube, get a small 12 volt pump and run a line to each valve cover. how to get it out, i dont know

drill a whole in the bottom of the cover so it can drain out!
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PostSubject: Re: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci - Page 2 Icon_minitimeSeptember 17th 2014, 12:38 pm

Drill and tap in some nice brass fittings, and use copper tubing to get the oil around the engine.
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PostSubject: Re: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci - Page 2 Icon_minitimeSeptember 17th 2014, 4:17 pm

TheBeal wrote:
I would like to see an oppy or v twin converted to horizontal... or even a larger single cyl.
I seen a few small 3.5 or something turned horizontal.

Id just use opposed horisontal parts and transfer them over if i did, lol.

Thunderdivine wrote:
Drill and tap in some nice brass fittings, and use copper tubing to get the oil around the engine.

Id do that, if i can figure out the oiling if it works first, like using rubber likes temporarily.

More stuff done, can some one tell me when the the spark plug fires? Like when the magnet passes the magneto? Before or after in the picture? Or is it a general area?

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Wrote down some info, the strokes of it are different between the two cyls.

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Some specs on  the opposed.

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And pardon my chicken scratch, but this is when the valves open and close on the strokes, and what the length of the stroke is of the pistion is in the bore.
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PostSubject: Re: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci - Page 2 Icon_minitimeSeptember 17th 2014, 4:53 pm

scratch my head hurts... i get the jist though
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PostSubject: Re: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci - Page 2 Icon_minitimeSeptember 17th 2014, 5:04 pm

willis923 wrote:
scratch my head hurts... i get the jist though
I guess i wrote it up for me. but all the stroke measurements and stuff are when valves open and close, what point the pistion is in the cyl. like how far down from the deck it is.
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PostSubject: Re: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci - Page 2 Icon_minitimeSeptember 17th 2014, 9:27 pm

Ok, now I see the thread... Someone should get working on the faux briggs and stratton sticker for the shroud, making it look like this was some kind of experimental engine from the factory. I guess the ohv head does hang out over the opposed engines bore quite a bit. Stupid guys can never make stuff line up so you can just bolt something together. If you need to fill in the flathead bolt holes at some point, a hack job idea would be to thread bolts in till they bottom out (but without snapping fins off of course) and then cut the tops off and grind smooth.
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PostSubject: Re: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci - Page 2 Icon_minitimeSeptember 18th 2014, 12:06 pm

I think it would look cool it you used the original shrouds on the sides with holes cut in them for the valve covers to stick out.  The holes should just be big enough for the covers to fit through. You'd have to take the shroud off to take the bolts out to take the covers off but that shouldn't be a big problem though.
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PostSubject: Re: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci - Page 2 Icon_minitimeOctober 13th 2014, 7:39 pm

Alright! This is pretty much the good bye to this project. As i look at it more and more, it seems like id be wasting heads and a big bore block for a little project.... So, i cant bring myself to hack it up.

The Heads would have to get holes drilled in them for the head bolts, you cant just drill into the block. the head bolt holes in the block are molded in like so:
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I feel bad for starting and ending a project that had potential, but it would just kill me to have a irreversible block and heads if it didnt work out.

Plans are more simple for this engine now, copper head gaskets, lap valves if needed, port and polish, internal gov removal.

Problem about the gov removal. The allen bolts at the bottom decided not to work with me and both stripped. They arnt left hand thread are they?

Anyways- i managed to drill the one head of the allen out with ease. the other one will not drill at all. i dont know why. someone can help me? I feel like if i use a easy out it will snap in there, this thing is stuck.

Drilled:
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Not so drilled:
 Briggs Opposed Build 46ci - Page 2 10719310


{EDIT}: i have already sold some of the v twin stuff, the cam and intake manifold are gone. The intek carb will stay on the opposed. If anyone wants some intek heads (COUGH stretch44785) then contact me.
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PostSubject: Re: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci - Page 2 Icon_minitimeOctober 13th 2014, 8:00 pm

try a 12hp flathead or something similar first to get a concept. that way if you screw up all is not lost.
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PostSubject: Re: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci - Page 2 Icon_minitimeOctober 13th 2014, 9:21 pm

Ahh, don't feel bad. There's no shame in coming to terms with the fact that a concept is impractical, not feasible, or just generally not the greatest idea. Was a neat concept- but in order to make it happen, you need access to tools, equipment, and skills that not too many of us (including myself) have.
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PostSubject: Re: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci - Page 2 Icon_minitimeOctober 14th 2014, 3:25 pm

You need to cast your own heads. Then no need to drill holes in the block. If you get the easy out in that bolt, just hold steady pressure on it while tapping on the block with a hammer. Might try a little heat too like from a propane torch, not like oxy acetylene melt through the block hot.
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PostSubject: Re: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci - Page 2 Icon_minitimeOctober 14th 2014, 8:59 pm

mr.modified wrote:
You need to cast your own heads. Then no need to drill holes in the block. If you get the easy out in that bolt, just hold steady pressure on it while tapping on the block with a hammer. Might try a little heat too like from a propane torch, not like oxy acetylene melt through the block hot.

Cast my own heads? Ermmm... And yea. I'll have to figure something out.
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PostSubject: Re: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci - Page 2 Icon_minitimeOctober 15th 2014, 1:50 pm

Yeah, you just make up some casting sand from a bag of play sand and some clay. Or buy actual casting sand somewhere. Then you just need a good hot fire and some half way rugged steel container. Aluminum melts at somewhere around 1200F with steel around twice that if I remember correctly. Of course you'll need some good quality aluminum, which is no problem, you can just melt down a push mower block or two. Find yourself some fairly stiff Styrofoam and carve out your head. There are different ways to do it, but you can pack the sand right around your Styrofoam and pour the aluminum right into that. The Styrofoam melts out of the way as the mold is filled with aluminum. All that's left after that is drilling a couple holes, pressing in your valve seats, and your good. Of course there's a bit of set up time involved maybe... I was thinking of making an ohv set up for a model 5s briggs at some point.

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