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 Briggs high hour 11 build

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CraftsmanQuad19
DimeWeld
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PostSubject: Briggs high hour 11 build   Briggs high hour 11 build Icon_minitimeThu Apr 14, 2016 10:57 am

Hey fellas (and any girls on here too!), I am currently building an engine with my best friend/partner in crime that I think you guys will be interested in.
So the engine is an 80's Briggs 11 horse flathead. Nothing too special about it. But it was used on a DIXON zero turn in a lawn business 8 hours a day for its first 13 years, then was given to my friends grandpa who used it on a pull behind mower until last year. The total hand calculated hours are a staggering 31,000 hours without a rebuild (+/- 1000). This thing is TIRED!!
But, we had a worthless (to us) 14.5 ohv Briggs just kinda kicking around. We took the piston and rings out of the 14.5 so we have compression back, a stronger rod that he picked up in shop class, and the higher lift cam out of the 14.5

So now I'm in the middle of eyebrows and porting. Once that's done, we're pulling it apart to clean everything and hone the cylinder and it will be going in his mud mower.
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1997 Murray
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PostSubject: Re: Briggs high hour 11 build   Briggs high hour 11 build Icon_minitimeThu Apr 14, 2016 11:12 am

Cool!
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MatthewD
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PostSubject: Re: Briggs high hour 11 build   Briggs high hour 11 build Icon_minitimeThu Apr 14, 2016 11:41 am

Nice! Keeping the governor?
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CraftsmanQuad19
DimeWeld
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PostSubject: HH11   Briggs high hour 11 build Icon_minitimeThu Apr 14, 2016 11:51 am

No, I forgot to mention that. We yanked the gov. out while it was open. as long as we're fairly responsible drivers i think it'll be fine. I have an identical 11 on my mower with way less hours, so we call this the hh11 and mine the lh11. Thats just clarification for if I say hh11 in the future, you guys aren't like WTF?? lol!
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MatthewD
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PostSubject: Re: Briggs high hour 11 build   Briggs high hour 11 build Icon_minitimeThu Apr 14, 2016 12:19 pm

Yeah I think it'll be okay. Got any pics?
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CraftsmanQuad19
DimeWeld
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PostSubject: hh11   Briggs high hour 11 build Icon_minitimeThu Apr 14, 2016 1:18 pm

Not right now, I'll have to take some when I get home.
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MatthewD
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PostSubject: Re: Briggs high hour 11 build   Briggs high hour 11 build Icon_minitimeThu Apr 14, 2016 2:13 pm

Okay. Looking forward to see it. Any idea of what age it is?
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CraftsmanQuad19
DimeWeld
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PostSubject: hh11   Briggs high hour 11 build Icon_minitimeThu Apr 14, 2016 3:04 pm

Pretty sure its an '83, but I don't remember exactly. Pics late tonight or this weekend.
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MatthewD
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PostSubject: Re: Briggs high hour 11 build   Briggs high hour 11 build Icon_minitimeThu Apr 14, 2016 4:43 pm

nice. At least it dont have points. Stock carb setup?
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CraftsmanQuad19
DimeWeld
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PostSubject: hh11   Briggs high hour 11 build Icon_minitimeThu Apr 14, 2016 9:02 pm

Yeah, for now. We're thinking about maybe a ATV slider carb or even efi from a scooter or something. Possibly even a homemade supercharger made from a weedeater leafblower attachment. air filtration would be the biggest concern though. This is my friend's engine though, so he will do with it what he may lol!
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CraftsmanQuad19
DimeWeld
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PostSubject: Re: Briggs high hour 11 build   Briggs high hour 11 build Icon_minitimeThu Apr 21, 2016 10:02 am

Does anyone know the easiest way to post pics from a mac that were taken by an iPhone?
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CraftsmanQuad19
DimeWeld
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PostSubject: Re: Briggs high hour 11 build   Briggs high hour 11 build Icon_minitimeMon Apr 25, 2016 8:46 am

Briggs high hour 11 build IMG_0332

Briggs high hour 11 build IMG_0333

so intake is done, still need to do the exhaust
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mr.modified
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PostSubject: Re: Briggs high hour 11 build   Briggs high hour 11 build Icon_minitimeMon Apr 25, 2016 5:16 pm

I don't think the pics made it. I don't know anything about phones or macs.... I put all my pics on photobucket these days and then link from there. You can hit preview to see if it worked or not before posting if you want to mess around trying to figure it out.
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MatthewD
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PostSubject: Re: Briggs high hour 11 build   Briggs high hour 11 build Icon_minitimeWed Apr 27, 2016 12:46 pm

I think you just linked the name of the file, what you gotta do is upload the image to an image hosting website, like photobucket or you could just use servimg that is tied in with the forum.
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CraftsmanQuad19
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PostSubject: Re: Briggs high hour 11 build   Briggs high hour 11 build Icon_minitimeWed Apr 27, 2016 9:56 pm

So images are linked to photobucket. I'm trying to figure out how to link them here.

Briggs high hour 11 build IMG_0332_zpsnh3and0r.jpg

this is the intake valve. Not perfect, but better than it was.

Briggs high hour 11 build IMG_0333_zpsomlo1o5h.jpg

And the eyebrows. Bad pictures I know, but I took more off than it seems.
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MatthewD
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PostSubject: Re: Briggs high hour 11 build   Briggs high hour 11 build Icon_minitimeThu Apr 28, 2016 11:46 am

Pics still arent working for me?
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CraftsmanQuad19
DimeWeld
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PostSubject: Re: Briggs high hour 11 build   Briggs high hour 11 build Icon_minitimeThu Apr 28, 2016 12:23 pm

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MatthewD
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PostSubject: Re: Briggs high hour 11 build   Briggs high hour 11 build Icon_minitimeThu Apr 28, 2016 12:31 pm

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CraftsmanQuad19
DimeWeld
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PostSubject: Re: Briggs high hour 11 build   Briggs high hour 11 build Icon_minitimeThu Apr 28, 2016 1:05 pm

[img]Briggs high hour 11 build Img_0310[/img]

[img]Briggs high hour 11 build Img_0311[/img]
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MatthewD
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PostSubject: Re: Briggs high hour 11 build   Briggs high hour 11 build Icon_minitimeThu Apr 28, 2016 1:43 pm

Ah, can see them now. Looks good Smile
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CraftsmanQuad19
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PostSubject: Re: Briggs high hour 11 build   Briggs high hour 11 build Icon_minitimeThu Apr 28, 2016 2:58 pm

Thanks for the compliment and thanks for the link. That helped a bunch! cheers
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CraftsmanQuad19
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PostSubject: Re: Briggs high hour 11 build   Briggs high hour 11 build Icon_minitimeSat May 07, 2016 10:59 pm

Exhaust is done. I took quite a bit out. The valve guide sticks into the port quite a ways but I didn't feel like jacking with that, so I took out some material on the opposite side of the port. Neither the intake or exhaust are perfect, but they are a heck of a lot better than they were.

So quick recap: Ported intake and exhaust, shaved the eyebrows down, cam from an OHV, heavier duty connecting rod, fresh rings/piston, and a carb off of a 12.5 flathead (yet to be done).

We'll compare this engines performance to my stock 25 cubic inch flathead and see just how big of a difference this made. The engine itself belongs to TheGreenHornet, whose account wasn't activated when I started this thread.

Any tips, questions, or comments welcome!
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prancstaman
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PostSubject: Re: Briggs high hour 11 build   Briggs high hour 11 build Icon_minitimeSun May 08, 2016 12:46 am

Did you grind on the short radius side of the runners when porting the intake and exhaust? This is the best spot to remove metal for best performance. I made a few vids on small engine mods on my You Tube channel if interested.
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CraftsmanQuad19
DimeWeld
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PostSubject: Re: Briggs high hour 11 build   Briggs high hour 11 build Icon_minitimeSun May 08, 2016 11:15 am

I'll check out the vids. What do you mean by short radius side? Is that the side of the port farthest away from the valve guide?
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prancstaman
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PostSubject: Re: Briggs high hour 11 build   Briggs high hour 11 build Icon_minitimeSun May 08, 2016 10:40 pm

A short radius side of the intake pathway- the pathway goes into the engine and turns up 90 degrees into the combustion chamber. The side of the pathway with the shortest distance on the 90 degree turn is the short radius side.

Drew a quick pic. Pic is of engine block and is the black lines. The pathway or intake runner is blue. The short radius side is orange which is where you want to grind off metal. The purple line represents the original path of fuel/air going into the engine before porting the short radius side. The red line represents the new path taken after you grind away on the short radius side.
Briggs high hour 11 build Pic_of10

How you need to think of it when you are porting is that the fuel/air charge is being sucked in and the suction starts at the piston when moving down. For the flat head engine, has a couple nasty sharp turns. These turns slow down the fuel/air charge moving into the engine. Your goal is to make these turns as less sharp as possible so the fuel/air charge keeps its speed moving through the pathway. When comparing the purple line to the red line, the red line has less of a bend in it compared to the purple line, so the red line will be faster moving going through the pathway. This can be done to the exhaust pathway also.

Flathead engines, OHV engines, OHC engines, have different pathway designs but the principle is the same, you just need to identify and evaluate the sections to do the porting. So the short radius side of the intake pathway will be in different spots on these 3 engines mentioned. My videos cover this and is done on a 5 hp Briggs and Stratton flattie engine. With other mods too, I made a couple vids on different parts of this engine.

Hope it helps
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