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Coffee Shop / A historical note on square exhausts
« on: December 03, 2013, 04:20:43 am »
A quick net search did not turn up anything to support this but I recall reading in the early days of auto racing a farmer/racer noticed his square elevators would move more grain then round ones.   

He tried fitting square exhausts to his race car but was unhappy with the results and went back to round pipes.

100 years and the same question pops up here :)

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Thanks guys.   I really don't need it fully balanced just want to get rid of the syncro counterweight and dog bone.  They bug me!


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Briggs Flathead / Arcracing 6561 Crank Coun​ter We​ight questions.
« on: November 24, 2013, 07:45:52 pm »
I am wondering about the cost for machining a Briggs 28M707 crankshaft to take the brass counterweight sold by ARC racing?  On cranks with the removable concentrics they align with the pin. How do you get the alignment right and keep them from turning on a machined crank?

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Coffee Shop / Re: Twin for Ariens rear engine riding mower
« on: November 24, 2013, 09:26:51 am »
I am going to open up the original 13hp diamond IC and if it does not require too much work rebuild it using a billet dog bone.   If that works out I am going to look for a tractor with a twin that I can hot rod.

If the engine is not worth repairing I will continue looking at an opposed twin for it.

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Coffee Shop / Re: Twin for Ariens rear engine riding mower
« on: November 21, 2013, 08:35:46 am »
Been thinking about it.   Found an 14hp opposed twin at the http://www.mowergraveyard.com/complete-engines-c-21/briggs-stratton-14-hp-opposed-twin-cylinder-engine-400707-p-11500.html for $120+$86.56 shipping and a member here has offered me one for less.  From what you can see the mower graveyard has nice looking tin if nothing else.



Found a photo of John Vinka's Aerins RER

Need to do some thinking.

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Coffee Shop / Twin for Ariens rear engine riding mower
« on: November 20, 2013, 08:27:58 am »
Ariens RM1332 rear engine rider in nice shape.



The engine burn a lot of oil.  I should tear it down and rebuild the brigs diamond IC 13HP but the fool in me wants a twin.  There is not enough room between the seat and the back to mount a V-twin so I was thinking that maybe an briggs opposed twin (oppy?) might.  I prefer not to stretch the body or hang the engine out the back.  Do not want it to look butchered.

Question 1: Is it reasonable to think one could locate one and rebuild a briggs opposed twin.   Any idea on costs.

Questions 2: How much motor can one use with the friction drive?

Net says Briggs made over 4 million opposed twins and production stopped in 2003.    I love the sound of these engines.  http://www.youtube.com/watch?v=jUCx3Hp50tA

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Newcomers / Re: Introduce Yourself
« on: November 19, 2013, 09:20:14 pm »
I am from the oklahoma panhandle and do not know that anyone is racing  mowers here.   But I was thinking I might see what I could do with one to have some fun.   I also have several small engines that need work or rebuilding. 

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