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Tricks For More Power.....


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#1 pwombles OFFLINE  

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Posted February 09, 2013 - 06:08 PM

Was just wondering if anyone had any diy tricks for getting a bit more power out of a briggs? I have a 243431 10 horse in the Wizard and wanted to get a bit more out of it. I understand the usual service things to do, but want a bit more pull power. Also what can be done to the old 6-8 horse verticals? Thanks



#2 pwombles OFFLINE  

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Posted February 09, 2013 - 10:24 PM

So i guess nobody knows?????????????



#3 olcowhand ONLINE  

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Posted February 09, 2013 - 10:43 PM

Not much that I know of that can be done, short of throwing more money at it than it would cost to simply buy a larger engine.  Same with the verticals.  



#4 916 hydro OFFLINE  

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Posted February 09, 2013 - 10:53 PM

i cant say this is true or not but a guy my dad used to work with raced go carts and he said to grind 1/16 of an inch off the end of the valve stem would give them a little more power  but like i said i dont know what kind of truth there is to it



#5 ol' stonebreaker OFFLINE  

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Posted February 09, 2013 - 10:54 PM

  Only tricks I know of would be to port and polish the int and exh ports and open up the exhaust at muffler outlet.I've never tried either so I can't speak from experience.

                                                              Mike



#6 olcowhand ONLINE  

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Posted February 09, 2013 - 10:58 PM

  Only tricks I know of would be to port and polish the int and exh ports and open up the exhaust at muffler outlet.I've never tried either so I can't speak from experience.

                                                              Mike

 

Yes, that will help, but not that much really.  If the engine is worn, then it might not help at all.  Pwombles, have you given it a full tune-up?  Tune-up first....anything more after tune-up.  And I can't understand grinding the valve to excessive clearance could help, as that would actually shorten the open duration of the valves.



#7 A.C.T. OFFLINE  

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Posted February 09, 2013 - 11:18 PM

untitled rocket mower.png

 

Not sure what rocket fuel runs nowdays.



#8 Gtractor ONLINE  

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Posted February 09, 2013 - 11:43 PM

Plane the head to where the valves just do hit without a head gasket - then reinstall head with new gasket. 

 

Grind some of the electrode off the spark plug so the fire jumps at the same spot every time. 

 

Grind a V notch in the center of the head to swirl the fuel mixture for better combustion. 

 

K&N  air filter

 

break every other cooling fin off the flywheel

 

Some of these are just plain bad ideas - enter at your own risk   :wave:



#9 larrybl OFFLINE  

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Posted February 09, 2013 - 11:45 PM

Not sure about the 8 - 10 hp's but I rebuilt two 18 hp horz twins. Average cost was around $350 each.

Bored to 0.020 over.

New 0.020 pistons and rings

New valves and springs, Laped thew valves

Grinded the valve stems to specs

New Gasket Engine kit

Carb Kit

Fuel Pump kit

 

I honistly think I have around 19 hp now, no way to really conferm, but they run good!


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#10 mtoney OFFLINE  

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Posted February 10, 2013 - 07:04 PM

Nice work!!  I need to go thru the Onan on my WH in the next couple of years.  What are your twins?  Looks like Briggs flat twins from the video.  Definatly sound good!   Wish I could overhaul an Onan for $350, but they are a bit more expensive for parts in my neck of the woods.   You hit the nail on the head.  Overhaul the engine and bring it back to factory specs or better.  Check everything, overbore if necessary ect. Then you will get the max hp you can out of them.  The tricks that pullers do are not usable in daily use, only for short duration down the pulling track.  Newer and high hp vert shaft engines are cheap to buy second hand on CL ect.  You could always go to a newer high hp engine.   Mike 


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#11 1978murray OFFLINE  

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Posted February 10, 2013 - 07:17 PM

shave the eye brows, port polish, port match, valve job this will make it seem like a new motor



#12 larrybl OFFLINE  

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Posted February 10, 2013 - 07:17 PM

The Brigs is a 422437 1209 01 with a code starting with 8805 (May 1988) Here is the second one, I swap them out every year.

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#13 Bruce Dorsi OFFLINE  

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Posted February 11, 2013 - 07:53 AM

Was just wondering if anyone had any diy tricks for getting a bit more power out of a briggs? I have a 243431 10 horse in the Wizard and wanted to get a bit more out of it. I understand the usual service things to do, but want a bit more pull power. Also what can be done to the old 6-8 horse verticals? Thanks

 

Do you know what rpm the engine is running at full speed?  

 

....Sometimes it's just a matter of increasing rpm to gain more power. 

 

....Of course, too much rpm makes things go BANG!

 

....It's a fine line between enough, and too much !!!!!



#14 1978murray OFFLINE  

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Posted February 11, 2013 - 08:26 AM

get a electronic lawnmower tach. it should run 3200-3600 rpm



#15 backwoods OFFLINE  

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Posted February 11, 2013 - 09:43 AM

when i raced go karts my 5hp briggs was puttin out about 12hp on race alky. billet alum. flywheel,alum connecting rod,bored out carb bigger jet, machined head, cam modificeations new valve springs. it was a blast a i always had fun racing but when i lost my job i got rid of the kart and everything that went with it.






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