Author Topic: Briggs model 28 piston  (Read 4052 times)

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Offline Leon_Johansson_

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Briggs model 28 piston
« on: October 30, 2018, 09:06:00 am »
I just started building a briggs model 28 i/c flathead with the arc dog bone and connecting rod but i just noticed that the cylinder bore is 3.3 inches (83.7)mm wide when it’s supposed to be 3.4 inches (87.7) mm. So i was wondering what piston should i get? One that is short enough for the arc rod and just 3.3in wide. Maybe the briggs model 49 piston?

Any help is appreciated.


Offline PJG56

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Re: Briggs model 28 piston
« Reply #1 on: October 30, 2018, 09:40:12 am »
Standard bore on model 28 flathead or ohv is 3.4375",
the only 2 briggs engines that use 3.300" bore is 21 ohv horizontal and 49 intek twin
Paul Guptill  (oppy) #238modX
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Offline Leon_Johansson_

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Re: Briggs model 28 piston
« Reply #2 on: October 30, 2018, 10:44:52 am »
Thanks, Do you have a link to the model 21 ohv horizontal piston?

Offline PJG56

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Re: Briggs model 28 piston
« Reply #3 on: October 30, 2018, 11:10:19 am »
Did you buy an ARC rod??If you did what did you buy 6280 or6281,they are both designed to use the model 28 and 31 AVS piston ,you should do some better measuring of bore,i think you are mistaken!
Paul Guptill  (oppy) #238modX
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2016 OutlawTriple Crown FXT Champion (engine builder)

Offline Leon_Johansson_

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Re: Briggs model 28 piston
« Reply #4 on: October 30, 2018, 12:39:38 pm »
Well i bought the 6280 rod and i have measured both the piston and the bore with a caliper and all.
But it always comes out as 83.7mm and thats quite a bit of difference from the 87.7 that it’s supposed to be. Maybe i should get the model 21 piston and try.

Offline PJG56

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Re: Briggs model 28 piston
« Reply #5 on: October 30, 2018, 01:09:15 pm »
Might want to try some different measuring tools,Like an inside mic
Paul Guptill  (oppy) #238modX
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Offline PJG56

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Re: Briggs model 28 piston
« Reply #6 on: October 30, 2018, 03:53:30 pm »
You will need the Biggs 792307 piston and 697099 wrist pin.
Good Luck
Paul Guptill  (oppy) #238modX
2012 slmra mowstock champion(builder/owner)

2013 slmra mowdified champion(builder/owner)
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2014 All American 2nd place SP(builder/owner)
2015 All American 2nd place BP (builder/owner)
2016 OutlawTriple Crown FXT Champion (engine builder)

Offline PJG56

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Re: Briggs model 28 piston
« Reply #7 on: October 30, 2018, 03:56:14 pm »
I also have a few nice used performance cams for your motor!!
Paul Guptill  (oppy) #238modX
2012 slmra mowstock champion(builder/owner)

2013 slmra mowdified champion(builder/owner)
2013 ARMA national champion Mod-X(builder/owner)
2014 ARMA national champion Mod-X(builder/owner)
2014 All American Champion Mod-X/CP(builder/owner)
2014All American Champion FXT (engine builder)
2014 All American 2nd place SP(builder/owner)
2015 All American 2nd place BP (builder/owner)
2016 OutlawTriple Crown FXT Champion (engine builder)

Offline Leon_Johansson_

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Re: Briggs model 28 piston
« Reply #8 on: October 30, 2018, 08:38:32 pm »
Thanks for everything and if you’d ship to a different country i would be happy to pay you through paypal.

Offline PJG56

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Re: Briggs model 28 piston
« Reply #9 on: October 30, 2018, 09:30:52 pm »
Where are you located
Paul Guptill  (oppy) #238modX
2012 slmra mowstock champion(builder/owner)

2013 slmra mowdified champion(builder/owner)
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2014 ARMA national champion Mod-X(builder/owner)
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2014All American Champion FXT (engine builder)
2014 All American 2nd place SP(builder/owner)
2015 All American 2nd place BP (builder/owner)
2016 OutlawTriple Crown FXT Champion (engine builder)

Offline Leon_Johansson_

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Re: Briggs model 28 piston
« Reply #10 on: October 31, 2018, 04:49:13 am »
Sweden

 

anything