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Messages - hustler54

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1
Kohler Engines / Re: 4" bore Kohler Command
« on: September 30, 2019, 04:52:01 pm »
That's what I was wondering about, seen a vid of a mwsc powered mower on the dirt oval and it was crazy fast. Just wondering what size was a common size for the big boys. Thanks for the info.

2
Kohler Engines / Re: 4" bore Kohler Command
« on: September 29, 2019, 12:59:14 pm »
Should have been specific about the twin, what is the largest bore size for a twin command running open modified?

3
Kohler Engines / 4" bore Kohler Command
« on: September 28, 2019, 02:08:24 pm »
Has anyone built a Kohler Command with a 4" bore?  Just wondering how big one can go on these engines, stock block no billet.

4
Kohler Engines / Re: command twin carb mods
« on: July 28, 2018, 08:13:02 pm »
Depending on the use, making sure the jetting is dialed in maybe all you need to do.  I've seen that 14.7:1 A/F ratio leaves power on the table, 12.5-13:1 is typically a good performance tune.  Unless your really opening up the heads and intake ports and turning high rpm's with a larger displacement build, I'd dare to say the stock carburetor will carry you a ways.  What is the engine going to be used for?

5
Kohler Engines / Average HP Kohler Command
« on: June 23, 2018, 11:28:36 pm »
Hello, new to the forum, and recently have had an itch to build a mower.  The engine of choice is a Kohler Command CV740.  I know it's impossible to give an accurate hp number due to different variables but really just looking for a realistic guess based from you fine folk's experience. So here is what I have in mind for the build. Oh I should also add that this will be run on a dirt oval track, I not sure the size, I'm thinking 1/4 mile?

I am shooting for good usable power from 3,000-6,800/7,000

Bore 3.46"
Stroke 3.1"
Flat top pistons
Billet 7075 rods ( longest that will fit) w/bearing inserts
CDI ignition
Tuned 1bbl with Vacuum Acc. Pump
245/251 @.050 106 LSA .501 Lift mechanical flat tappet
Close Chamber heads w/ 1.50 intake-1.3 exhaust, fully ported, milled, cc'd to achieve 11.5-12:1
Billet Flywheel
Long tube header 1"

I'm here to learn so if you could answer some questions, that would be great.
This is going to be a budget build but not really sure where to save and where to spend.

The pistons are cast, will these hold up under the rpm's or should I spring for forged

Can the 1bbl be a viable choice, or should I swap it for a 2bbl? I was looking at the acc. pump on this decision but guess it would be useless once the rpm's are above a certain point.

I ported a head I had laying around, didn't really enlarge it, only matched to the intake and straighten the port to the bowl, then just rolled the short side and blended everything with a sanding roll.  I also knocked down the guide bosses even with the port roof.  I think I know your supposed to keep the cross section area before the bowl 80% of the seat.  I think I screwed this head up but was just trying to get the feel for the cutter.  Not looking for secrets just vague points in the right direction.

I was figuring if I done some research and planned everything out, I could expect high 30's low 40's?

Many thanks





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