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Topics - beezerboy

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Kohler Engines / convert vertical to horizontal?
« on: May 06, 2017, 01:29:52 am »
I have a 25hp Kohler CV25 & would like to convert it to a horizontal installation. I'm thinking that can be done fairly easily.... am I right? obviously the intake manifold is different, and the oil pickup tube is needed.  do I need a different oil sump too? I know the heads have to have an oil hole drilled. what else? thanks

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Kohler Engines / V twin long rod
« on: November 21, 2013, 02:47:33 pm »
My research on the long rod conversion is coming up with very mixed results.  There is tons of opinion and calculation out there, but is there any dyno proof that the long rod produces more useable power in this type engine, and if so, at what rpm range is it most beneficial. doing the long rod requires a different piston, so what I am primarily interested in is results due only to the rod.... not counting changes in compression ratio. any comparison of different rod with same C/R would be useful. thanks for any insight

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Kohler Engines / 25 hp V twin build Q's
« on: November 16, 2013, 09:07:01 pm »
I'm going to hop up my CV25 a bit this winter. It runs props on my hovercraft so I need to keep RPM in the normal range. So far I am going to do a port & polish and a good 3 angle on the valves & seats. I have a 27/30 cam to install because that's what my research indicated.... a custom grind would do little at my RPMs.

heres my other possibilities:

long rod conversion.... really thinking I like that idea. I believe the required pistons also bump the compression ratio a bit due to the flat tops, so the question would be, how much? and would the .060 copper gasket keep me in the range to still use regular gas. the other question is the bores.... to provide the right piston clearance, I will need to hone a couple thou (according to Zack.. I believe him) anyway, some are apparently Nikasil, so that would be out. is there any way to tell without pulling the engine apart (like series/build number)?

Roller rockers.... is there any point in doing this on a low RPM engine?

Roller Lifters.... same?

Spark advance..... what is the stock advance on the 25 and on the 27 (since I might use a 27 cam).

What else? is there something I should consider for an engine that can't turn more than about 3300

http://youtu.be/0ZQih6QPiZU

http://youtu.be/B3FKZ91LObo

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Kohler Engines / roller cam for 25 twin
« on: October 11, 2013, 01:42:54 am »
I know there are roller followers made for the Kohler twin.... how would the roller work with the stock cam? research suggests it might be worse without a cam specific for roller design. what cams are out there? everything I see is aimed at higher rpm ranges. my rpm must be kept below 4000, and 3800 is better because of my propellers (hovercraft)

I was planning on using a 27hp cam in my 25hp Command.

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