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  Briggs Opposed Build 46ci

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Doug
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redlinemotorsportts
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PostSubject: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci Icon_minitimeSeptember 11th 2014, 6:13 pm

***TITLE WAS CHANGED FROM OHV BRIGGS OPPOSED BUILD 46CI TO JUST BRIGGS OPPOSED BUILD 46CI DUE TO CHANGE OF PLANS***

Well ive been looking for one of these and no-body has attempted. If it was just my usual garage time i wouldnt have done this. But since my tech class needs a build.... Lets take a crack at making a one off briggs.

Theirs a thread on hey mow of someone kicking dirt, im not the only one. Old thread

Let me clear a few things up as to why im attempting to do this:
-I have the parts available from a salvage yard, that i got dirt cheap ($31)
-Nobody has done it. Lets try it out!
-Need a school project
-WOW factor always makes me smile.
-Not trying to make more hp or anything, although i think i will gain performance.
-Because i can damnit! LOL


Lets start out with our opposed. 46ci, 21Hp from a craftsman of some kind (wasnt attacted). My first big cube twin flatty.

 Briggs Opposed Build 46ci 10682011

Removed the carb/intake and gov. Never would be able to re attach it anyways.

Heads, intake manifold, and carb Are from a 44ci 25hp briggs intek v-twin.

Junkyard pic of all the junk i got:
 Briggs Opposed Build 46ci 10660711

Engine in class

 Briggs Opposed Build 46ci 10603010
 Briggs Opposed Build 46ci 10634110
 Briggs Opposed Build 46ci 10705310

Cam, crank, Rods, pistions, oil slinger, ect. look great.

 Briggs Opposed Build 46ci 10699210
 Briggs Opposed Build 46ci 10668310

Cracked both heads, looks mint on the cyl wall. the cross hatching is still very good. Carbon buildup was everywhere though. Cleaned it up tho. Wire brush works great.

 Briggs Opposed Build 46ci 10578910

So, before this all began i knew the bore of the opposed is bigger than the intek. so that was my main concern. Blowing head gaskets. Still is a problem, but i have resolved some of my suspicions...

The intek's head with the briggs cyl wall.

 Briggs Opposed Build 46ci 10681810

I took the intek's head gasket and traced with a pencil, roughly centered, to give me a idea. i think im going to get a gasket kit and make my own (Not sure if you can on head gaskets?) gaskets when its all completed. the intek's head is really flat, not just where the combustion chamber dome is. maybe not milled flat, but i can make the gasket wider then what you see.

 Briggs Opposed Build 46ci 10699110
 Briggs Opposed Build 46ci 10681910


And just a teaser. put one bolt in that is kinda close to where it would be. Just for a pose pic.
 Briggs Opposed Build 46ci 10681710
 Briggs Opposed Build 46ci 10704910


Last edited by redlinemotorsportts on October 20th 2014, 5:03 pm; edited 3 times in total
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Doc Sprocket
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PostSubject: Re: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci Icon_minitimeSeptember 11th 2014, 6:48 pm

Y'know, I read the thread title, and said, "What the f............?"

Interesting concept. Be interesting to see you pull it off. Whether there's any real benefit to be had in an example like this or not- it sure is a cool proof-of-concept.

I'm interested to see how you manage the pushrods, etc. Good luck!
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redlinemotorsportts
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PostSubject: Re: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci Icon_minitimeSeptember 11th 2014, 6:53 pm

Doc Sprocket wrote:
Y'know, I read the thread title, and said, "What the f............?"

Interesting concept. Be interesting to see you pull it off. Whether there's any real benefit to be had in an example like this or not- it sure is a cool proof-of-concept.

I'm interested to see how you manage the pushrods, etc. Good luck!
Apon moc-up my biggest problem to me is sealing the head, ive got some big spots by the valve to plug some how...

And if anyone is wondering, this is kinda a hack job. I dont have any way to mill or machine much. but measuring/tapping/welding i have.
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Doc Sprocket
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PostSubject: Re: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci Icon_minitimeSeptember 11th 2014, 7:17 pm

Duct tape.
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PostSubject: Re: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci Icon_minitimeSeptember 11th 2014, 7:40 pm

you beat me to it, altho i wantedbto make a ohv a flat head. anyways, im thinkin you could get long skinny bolts or nails to use as pushrod. as far as the gaskets concerned, im thinkin as long as you make a gasket around the cyl, there wouldnt be a prob with the open valve ports
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PostSubject: Re: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci Icon_minitimeSeptember 11th 2014, 7:50 pm

This is sounds pretty cool, it will be interesting to see if there is a horsepower/torque gain at all. Or if you can make the oppy less thirsty lol.
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PostSubject: Re: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci Icon_minitimeSeptember 11th 2014, 7:54 pm

Head gasket...

Use copper sheet.
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redlinemotorsportts
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PostSubject: Re: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci Icon_minitimeSeptember 11th 2014, 8:01 pm

Thanks guys.

Check out the second to last picture. You can actually see the valves. Even though it isnt mocked in the correct spot (needs to be moved up and over about 1/8") it will still leave room for the valves. i might have a issue also in that one of the head bolts goes right in between the intake and exhaust valves.... like, RIGHT in between them. might drill allllll the way thru the block and put a nut where the valve springs are? I dunno what that looks like.
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Doc Sprocket
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PostSubject: Re: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci Icon_minitimeSeptember 11th 2014, 8:40 pm

crafsmankiller wrote:
im thinkin you could get long skinny bolts or nails to use as pushrod.

Ummmmmmm..... No.
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PostSubject: Re: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci Icon_minitimeSeptember 12th 2014, 1:27 am

crafsmankiller wrote:
im thinkin you could get long skinny bolts or nails to use as pushrod.
Reminds me of when i put a bolt in a air hammer way back when to drive nails. Worked ok till it mushroomed out and seized up the mechanism
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PostSubject: Re: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci Icon_minitimeSeptember 12th 2014, 6:56 am

Moose wrote:
crafsmankiller wrote:
im thinkin you could get long skinny bolts or nails to use as pushrod.
Reminds me of when i put a bolt in a air hammer way back when to drive nails. Worked ok till it mushroomed out and seized up the mechanism
Both of you. Wat
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PostSubject: Re: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci Icon_minitimeSeptember 12th 2014, 8:36 am

Wait what? scratch
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PostSubject: Re: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci Icon_minitimeSeptember 12th 2014, 10:35 am

If you use a bolt as a push rod it's just gonna fatigue and break :v
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PostSubject: Re: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci Icon_minitimeSeptember 12th 2014, 11:31 am

Moose wrote:
If you use a bolt as a push rod it's just gonna fatigue and break :v
I was talking about your air hammer story.

ANYWHO...... tongue
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PostSubject: Re: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci 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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PostSubject: Re: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci Icon_minitimeSeptember 12th 2014, 12:55 pm

Different...

No means to machine anything at all?
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PostSubject: Re: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci 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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PostSubject: Re: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci Icon_minitimeSeptember 12th 2014, 2:41 pm

Eeeg. Make sure your drill press is true and the bearings are good.
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PostSubject: Re: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci 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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PostSubject: Re: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci 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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PostSubject: Re: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci 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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PostSubject: Re: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci 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 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?
 Briggs Opposed Build 46ci 10708210
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PostSubject: Re: Briggs Opposed Build 46ci    Briggs Opposed Build 46ci 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 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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