Liquid Cooled Snowmobile Engines (general info) - Snowmobile Forum: Your #1 Snowmobile Forum

User Tag List

LinkBack Thread Tools Display Modes
post #1 of 7 (permalink) Old 03-21-2009, 04:03 PM Thread Starter
Registered User
Phillip.Toone's Avatar
Join Date: Mar 2009
Location: Albuquerque
Posts: 1
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liquid Cooled Snowmobile Engines (general info)

Hello all, this is my first post here so I'll briefly introduce myself before getting to my inquire for direction and recommendations. I am a 34 year old engineer who grew up on Yamaha Bravo 250s, Enticer 300s, and Enticer 340s. After all these years I have finally acquired my dream machine of a Yamaha Phazer (two of them actually). I keep them in Utah with my family and drive them when I visit. Of course they use them also, hence the reason for not owning something very expensive. Maybe someday ...

Anyway, I would like to design and build a small, one person, mini dune buggy (something like this) powered with a snowmobile engine and CVT. I would expect that this will require a liquid cooled engine, 500cc or bigger, with an over sized (car) radiator. I would also expect that the most economical way to acquire all of the part I will need would be from a running, and perhaps wrecked, snowmobile. Something that is very common would increase the likelihood of finding cheap initial and replacement parts from old, wrecked and broken machines from sources like eBay, classified ads, and craigslist. I searched the internet for some comprehensive information about what engines are used in various machines along with some basic information about each engine such as displacement, number of cylinders, horse power, weight, method of cooling, ect. but I have not come up with anything useful.

So I am asking for your help in finding this kind of information and for your own personal recommendations. I remember when we began to retire our old machines that the Polaris Indy was getting a lot of attention for its innovative design features such as being liquid cooled so I looked there first but have not found anything very helpful. I look forward to any information that you can share to help me out. Thanks.

Also, EFI would be REALLY cool but I am guessing that will be prohibitively expensive.
Phillip.Toone is offline  
Sponsored Links
post #2 of 7 (permalink) Old 03-21-2009, 08:21 PM
Super Moderator
BC_Dan's Avatar
Join Date: Jan 2004
Location: oregon
Posts: 15,059
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 103 Post(s)
Welcome to the forum!

Sounds like a fun project. The 500 size sleds deliver 70-80 hp, depending on pipes. Bigger HP engines make bigger heat, the heat may be a problem for you to get rid of, even with an oversized radiator. Bumping up to a 600 gives you a huge increase in hp (Polaris Edge 600's are in the 110-120 hp range) which is a TON of power for a wheeled vehicle. Figuring out the pipe routing may be a challenge as well! The Polaris 500 (Fuji) liquid is probably the most dependable engine Polaris ever made, and they made a ton of 'em. The Polaris 600 (Liberty) also has a good rep for holding together over time.

There are lots of wrecked sleds with bent tunnels that would make for nice cheap donor parts. With a bent tunnel, most insurance companies total the sled and put it to salvage. You may find everything you need in one donor sled. That will give you the clutches as well as the engine and wiring harness. You will have to fab air filters; there's not much need for filtered air when you ride in the snow. There are manufacturers that make pod filters that may meet your needs for clean air.

EFI is nice, but I am wondering if the program goes lean enough to handle the hot air of summer time. You may have to have the ECU reflashed for your summertime needs to be able to run efficiently. Carbs will be a LOT easier for ease of tuning...

Keep us posted!!
BC_Dan is offline  
post #3 of 7 (permalink) Old 03-22-2009, 07:57 AM
Super Moderator
RJ Gleason's Avatar
Join Date: Feb 2005
Location: NY
Posts: 34,103
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Actually, you would not need to use a larger radiator than is used by a 'wheeler.
A small radiator and a thermostatically controlled electric fan would be more than adequate.
An EFI equipped engine would be capable of running well in warm temps as you would not have to be worrying about jetting for temp and elevation.
The only concern would be getting the clutching right for the weight of your machine and the performance curve that you desire.

Old Cat Rider
'93 Wildcat 700EFI
w/ Comet 108 Pro-4 clutch & 01 ZR skid

Past Master; F&AM Dryden Lodge# 472

Rules of this forum are strictly enforced!
RJ Gleason is offline  
post #4 of 7 (permalink) Old 03-23-2009, 06:58 AM
Registered User
Join Date: Mar 2009
Posts: 5
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
You may want to look at an old golf cart made by Yamaha for some ideas. They used a 215cc 7port reversible AIR cooled motor. Same clutching theory as a snowmobile (weighted primary , ramp secondary). It has a secondary gear reduction system that may give you some ideas for final drive system. It also uses a starter/generator system which starts and reverses the engine. The power is way low but it may give you some direction.
jgstang67 is offline  
post #5 of 7 (permalink) Old 03-23-2009, 05:35 PM
TRH- Troll Raising Hell
SMFXRSB's Avatar
Join Date: Mar 2007
Location: Plymouth Area, MN
Posts: 6,133
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I like the "mug" shot!

Snow: The other white drug!
SMFXRSB is offline  
post #6 of 7 (permalink) Old 03-24-2009, 08:31 AM
Super Moderator
kccats's Avatar
Join Date: Dec 2006
Location: Northern IL
Posts: 23,429
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 143 Post(s)
Got plans to do the same thing! I had one made with a 750 Susuki motor cycle engine! And yes a Geo radiator works great with the fan! Electric start and rev and EFI would be perfect! BUT The biggest challenge is going to be the rear axel! I had a straight axle and if you are drag racing or out in the sand dunes is perfect! But to turn or corner you would want some type of differental! May be a Golf cart????
kccats is offline  
post #7 of 7 (permalink) Old 03-26-2009, 08:06 AM
Super Moderator
kccats's Avatar
Join Date: Dec 2006
Location: Northern IL
Posts: 23,429
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 143 Post(s)
What I am working off of is a Geo traker! At any rate, what I see is if you take an old axle and cut it off and have a plate welded on to the end and a bolt pattern drilled, you could bolt it right to the input flang of a rear end! Then put on a chain case! With Rev too! Then it's just a mater of shrinking the jack shaft and mounting it all! This will give you everything!
Im using the Geo Tracker front pumpkin with CV joints and independant suspension!
kccats is offline  
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Snowmobile Forum: Your #1 Snowmobile Forum 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:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may post new threads
You may 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