Author Topic: #25 flat head briggs ?  (Read 11215 times)

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Offline meanmachine

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#25 flat head briggs ?
« on: July 31, 2010, 02:26:50 pm »
alright i ask for help on a #25 briggs all your input  was great, very helpful but just a couple more ? if i could. I have two of these motors already thinking of getting a billet rod new pistion and rings and balance the crank or i see someone makes a billet rod for the stock balance will this work? then i see what you call threads about using a 25 for a boat anchors i'm unable to find a 28 yet but wondering if i should look a little hard for a 28 and about carbs one piece ? three piece  what the diff. before any posts it ,two more pieces :lol: again im drag racing this motor on a budget will a umgovern 28/25 motor  have a chance against mostly stock 18 hp vtwins
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Offline jerb

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Re: #25 flat head briggs ?
« Reply #1 on: July 31, 2010, 08:00:22 pm »
it would be worth your time to find a 28, as for carbs the 2 piece walbro carbs are the best if you have to run a stock carb, i would say you will prolly be hard pressed to keep up with the v-twins but that depends on alot of factors as well!
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Offline guitarplayer

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Re: #25 flat head briggs ?
« Reply #2 on: August 01, 2010, 03:53:55 pm »
i'd suggest to find a crank out of a 28 and make a stroker, watch this video i made it explains how to do it and what the differences are between the 2 motors.

http://www.youtube.com/watch?v=H1kiFqCDCh0

Offline Snowman18

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Re: #25 flat head briggs ?
« Reply #3 on: August 01, 2010, 05:49:51 pm »
I ran a 25 "Cool Bore" for a few years, I found a crank out of a horizontal 25 and eliminated the Syncro balance system, it ran very well. With that you could get the ARC rod and AVS piston but you would need to use the iron bore block.
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Offline meanmachine

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Re: #25 flat head briggs ?
« Reply #4 on: August 01, 2010, 11:04:57 pm »
iron bore block??? :confused: cast iron sleeve?
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Offline Snowman18

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Re: #25 flat head briggs ?
« Reply #5 on: August 02, 2010, 10:44:47 pm »
Yes.
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Offline Rooster

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Re: #25 flat head briggs ?
« Reply #6 on: August 02, 2010, 11:27:30 pm »
aND A HOT RODDED FLATTY WILL EAT A STOCK ANY THING
Bert stole my cookies!!
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Offline Snowman18

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Re: #25 flat head briggs ?
« Reply #7 on: August 02, 2010, 11:37:55 pm »
As long as you use the right cam, I unfortunately did not.
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Offline amcchevy1

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Re: #25 flat head briggs ?
« Reply #8 on: August 03, 2010, 01:29:42 am »
I ran a 25 "Cool Bore" for a few years, I found a crank out of a horizontal 25 and eliminated the Syncro balance system, it ran very well. With that you could get the ARC rod and AVS piston but you would need to use the iron bore block.
or find a good engine shop to bore and sleeve the coolbore bkock. so far, 2yrs with no problems
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Offline George Herrin

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Re: #25 flat head briggs ?
« Reply #9 on: August 03, 2010, 07:03:38 am »
i'd suggest to find a crank out of a 28 and make a stroker, watch this video i made it explains how to do it and what the differences are between the 2 motors.

What rod and piston combo did you build a stoker with. Wasn't a stock length rod and stock piston it pops out too much and would require cutting the top ring off. Or at very least the top ring land is so thin it will colapse once it starts to run.

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Offline guitarplayer

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Re: #25 flat head briggs ?
« Reply #10 on: August 03, 2010, 02:51:14 pm »
What rod and piston combo did you build a stoker with. Wasn't a stock length rod and stock piston it pops out too much and would require cutting the top ring off. Or at very least the top ring land is so thin it will colapse once it starts to run.



in the video i talked about this, as i said i didn't "build it" but just put the crank rod and piston into place on what would be TDC, and it stuck out about a 1/4 inch. and the block and cam has to be grinded to clearance the bigger crank throw. it takes a 28 rod and piston, doesn't arc make a slightly shorter rod for the 28? and use their magnesium piston, which i thought they had a shorter piston too, i know they have a shorter skirt one but yeah... haha it's interesting to think to about, and i'm gonna do it eventually.

Offline George Herrin

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Re: #25 flat head briggs ?
« Reply #11 on: August 03, 2010, 02:53:30 pm »
No there is no rod for the setup you are referring to. Thats why I asked. If you do it you will have toi make a rod specifically for it.
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Offline guitarplayer

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Re: #25 flat head briggs ?
« Reply #12 on: August 03, 2010, 03:48:22 pm »
No there is no rod for the setup you are referring to. Thats why I asked. If you do it you will have toi make a rod specifically for it.

sorry i misunderstood you. well there you go, remember a few weeks i started a topic talkin bout making connectings rods? well this is gonna be my first "rod-project" :-P i bet a 25 stroker would be a good little engine, yeah it would be pretty much the same as a 28, but it's interesting because its unusual, and nothing else it would make a great engine to cut grass with hahahaha

Offline George Herrin

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Re: #25 flat head briggs ?
« Reply #13 on: August 03, 2010, 04:17:07 pm »
We do not in any way shape or form modify a grass cutter. Its not even open for discussion on heymow....That is a deadly mix.
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Offline guitarplayer

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Re: #25 flat head briggs ?
« Reply #14 on: August 03, 2010, 04:31:45 pm »
We do not in any way shape or form modify a grass cutter. Its not even open for discussion on heymow....That is a deadly mix.

just jokin man lol
but it would have to have custom made rod

 

anything