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 11 
 on: Today at 05:32:02 AM 
Started by rene knoll - Last post by Rocket Ron
Tyler, Before you start hi jacking this tread also. Should I remind you The Kolher section is a few sections down,  I think Rene' question was how do you idenafi a 49 b&s block.And also I'm got my own Kolher project under way  It will be larger than any thing we've spokeabout :bash:Ron.

 12 
 on: Today at 04:15:20 AM 
Started by rene knoll - Last post by Cromwell C4
The biggest engine Kohler makes (in the standard small block series) is a 30hp CH/CV750 engine and it is 45.6 CI. A 25hp engine is 44 CI. The 25hp and the 30hp have the exact same block with a 3.27 (83mm) bore size, the only internal difference is the 25hp has a 67mm stroke crank and the 30hp has a 69mm stroke crank. The 25hp and 30hp block can have the same part number.  Buy a 30hp crank for your 25hp engine and you end up with the same result. And as Paul said, to make a 20hp Kohler into a 25hp all it takes is a simple bore job.  So the thought about all the "illegal" kohlers doesn't even make sense.

If you guys look closely at the rules in FXT/Super Mod Twin for example, it says you must START with a certain factory rated HP or CI block, and from there in the US rules it clearly states " Modification to block and heads are open" and in ARMA "Modifications to the block and heads are unlimited." What CI you achieve using your Factory block is only limited by your imagination (or wallet), but go too big and you will have a bucket full of parts after a few races if that.  Most of the Kohlers that are the front runners are actually well under 50ci. The big radical engines run hot and are more prone to failure due to the thin cylinder walls and high compression. An extreme motor is very hard on parts. That's why you see the Nascar and NHRA guys rebuilding their motors after every race, and even then they still have failures. Ryan Kerr's wicked Kohlers won a lot of races at only 45CI. All the top guys in the V-twin classes are making great HP, now it comes down to who has the best handling chassis and can drive it consistent every lap.

 13 
 on: November 23, 2014, 11:25:34 PM 
Started by rene knoll - Last post by cycloneracer
44.5 CID.

I thought they were rated at 32HP.

It is a simple bore job to make a 20hp Kohler bigger. 

 14 
 on: November 23, 2014, 11:19:30 PM 
Started by rene knoll - Last post by more4les
http://www.ebay.com/itm/Kohler-Command-Pro-OHV-Horizontal-Engine-30-HP-PA-CH750-3006-/331058142609?pt=LH_DefaultDomain_0&hash=item4d149a5d91

They also have them in vertical. They are 750cc or 46 cu in.



Lester

 15 
 on: November 23, 2014, 11:02:58 PM 
Started by rene knoll - Last post by cycloneracer
There are more illegal Briggs blocks out there than all the others combined. 

Kohler don't make a 30hp engine that I'm aware of. 

 16 
 on: November 23, 2014, 10:52:27 PM 
Started by RoMow - Last post by more4les
I run those same gear sets in my 820 along with the next available gear set  (overdrive) utilizing a 6 speed gear set.

Lester

 17 
 on: November 23, 2014, 10:30:05 PM 
Started by rene knoll - Last post by more4les
Here is my beef when you knock out the 49 block. It lets big money rule the races. You can buy a 49 block for 1/3 the cost of sleeving and boring a 44 block. It takes more than a simple sleeve job to make this work also. It takes extensive welding and machining of the block (internally) to get a head gasket to seal on a 44 with 49 sleeves. A new 49 block can be had for about 175 bucks. If the rule is 44 cube then cube check them all. Regardless how they got above 44 make them illegal. Otherwise this 49 bashing needs to come to an end. How many 30 HP Kohler blocks are out there I ask? More than anyone wants to admit.

Lester

 18 
 on: November 23, 2014, 10:22:52 PM 
Started by George Herrin - Last post by birdman_express
Everyone always counts them out, until someone builds a good one!


 bigsmile    ninja

 19 
 on: November 23, 2014, 10:22:17 PM 
Started by highway96 - Last post by highway96
Hey, Thanks for the info. Why is none of the racing people selling them, since everyone is using them? Thanks Bill

 20 
 on: November 23, 2014, 09:58:40 PM 
Started by George Herrin - Last post by royalblu68f100
Everyone always counts them out, until someone builds a good one!

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