Kohler Magnum M18 hop ups? - Page 2 - MyTractorForum.com - The Friendliest Tractor Forum and Best Place for Tractor Information
The Pulling Club Puller Builds and Discussions

LinkBack Thread Tools Display Modes
post #16 of 18 Old 09-23-2013, 08:28 PM
MTF Member
belt drive mafia's Avatar
Join Date: Sep 2011
Location: Georgia
Posts: 96
Re: Kohler Magnum M18 hop ups?

Sorry about that I got a little of course on the reply. Kevlar belts are available through Tractor Supply and can be ordered from NAPA. As for the cam anyone who grinds cams for command engines can grind one for the magnum engine. I have a puller with a 18 hp
vertical shaft magnum and have had good luck with it. The exhaust for it is a large u shaped pipe similar to a staple, which has the engine pipes run into it at the bottom. It is a one piece with a stack on each side with a flapper style rain cap on them. It runs out under the hood and turns up on each side.

Never confuse activity with accomplishment.
belt drive mafia is offline  
Sponsored Links
post #17 of 18 Old 09-23-2013, 10:34 PM
MTF Member
Dieselcubmike's Avatar
Join Date: Jan 2013
Location: Pa
Posts: 54
Re: Kohler Magnum M18 hop ups?

Originally Posted by MrB54 View Post
Hi, D cub mike, great videos, thats a good deisel class you have there, and a lot of different places to pull. I need to post some videos of mine, i've got a 25hp v twin in it. Mike
Thanks MrB. I really enjoy running this class and so do the others. Were all one big family and well do anything we can to help each other out. Just wish it wasn't so expensive at times lol. Just blew out a turbo this past weekend

Check out my pulling videos!

Dieselcubmike is offline  
post #18 of 18 Old 08-10-2018, 07:19 AM
Senior MTF Member
tkskagen's Avatar
Join Date: Nov 2014
Posts: 763
Re: Kohler Magnum M18 hop ups?


I have both a Horizontal & Vertical Shaft Kohler Magnums that are 18hp.

I also have Heads (jugs), intake, carb, Cam, and Crankshaft from a "BLOWN" Horizontal Shaft Kohler Magnum 20hp...

Which parts/direction can I go beyond Billet Flywheel & updated Disc Brakes?

I'm gonna keep an eye out for a "dead" Cub over the winter with Shaft Drive.

This is "Just for Fun" with no intentions of ANY Competition!

Any help is GREATLY appreciated.

-Thomas (12)
Port Orchard, Washington
Originally Posted by roadranger View Post
OK, I've found out that the M18 has a 2.75 stroke and comp ratio of 6.0:1
The M20 has a 3.06 stroke and comp ratio of 6.6:1
Same Bore for each engine of 3.12

CAN I put an M20 crank in my M18 block? I'd like the better torque, and more bang for your fuel with the higher ratio. Must have to change pistons also for proper TDC height for higher compression ratio... I wonder if the deck heights on each engine are the same??

OR; should I just chuck the M18 and look for a M20 Kohler Magnum??

My Pulling Club allows engines +/- 2hp to original built hp, so this would be a hop up I'd attempt.

Still trying to figure out how to get 2 in 1 headers built for this block.
I know there's a ratio for how long the pipe from the head flange to the collector inlet is to it's engine displacement, for a 'tuned' header.
BUT, where do you find this tuning length??
Another allowed hop up in my Club.

This is my first pulling tractor, and I want to hot rod it this winter to run next season. I like the opposed twin vs. the ever popular V-Twin, more torque for the opposed at same displacement of the V. And it's better balanced...
Sent from my SM-G900V using Tapatalk
tkskagen is offline  
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the MyTractorForum.com - The Friendliest Tractor Forum and Best Place for Tractor Information forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome