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BodySax/MTC AIR cooled kit for RCMK twin

Discussion in HPI Baja Builds and Projects forum, started by saxtoft.

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  #1  
Old 01-15-2011, 05:52 PM
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BodySax/MTC AIR cooled kit for RCMK twin

We are just around the corner now with an air cooling kit for the RCMK S520 marine twin and I thought that I wanted to show some pictures of the latest prototype. There are some changes that are not shown in these pictures, such as the new flywheel nut and the latest pull starter brace.

With this kit the Baja driver can convert the RCMK water cooled twin to air cooling allowing it to be build into our Bajas.

Together with our build in kit consisting of tranny plate, chassis plate and layshaft the driver just have to add exhausts an airfilter to get going.



The air cooling kit will consist of a new one piece shell, a billet cover directing the high presure air flow over the shell for maximum cooling, a high speed (1,5 speed/<28000 RPM) fan unit, a new fly wheel nut, a pull starter brace and a rear motor mount.









We will recommed driving it with our airfilter bridge



And the coming Victory RC pipes



Stay tuned....
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  #2  
Old 01-15-2011, 06:14 PM
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Sayyaaf Sayyaaf is offline
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Great Saxtoft, one small note though, the filter bridge, why don't you include a filter foam (as a 2 srage fitleration) to avoid dirt getting inside incase the main filter was forgiving a little ?
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Old 01-15-2011, 08:51 PM
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Looks great. That air-cooling system is going to need Outerwears.
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Old 01-15-2011, 09:11 PM
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It is a part of the final solution. We are testing some different net.
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Looks great. That air-cooling system is going to need Outerwears.
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Old 01-16-2011, 07:51 PM
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That engine and air cooling set up looks crazy!
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Old 01-16-2011, 08:32 PM
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That's something different!...with twin pro pipes it is going to be wild.
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Old 01-17-2011, 02:01 AM
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A TS/ twin would be sweet too!!!!
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Old 01-17-2011, 02:25 AM
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This is by far the smartest twin kit I've seen, it's obvious you have been doing your homework. I love the water-cooling kit too!
One he'll of an original idea.
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Old 01-17-2011, 02:29 AM
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Lunatik Engineering Lunatik Engineering is offline
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I'm going to fab some 2"band aluminum boat pipes on mine. It will scream like a banshee!
Two steel pipes will weigh a ton in my opinion.
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Old 01-17-2011, 04:00 AM
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lol, I like it too! Id like to hear what it sounds like in a vid!!
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Old 01-17-2011, 04:46 AM
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I read OBR are also working on a "new"cooling system,..I wonder if it is similar.
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Old 02-13-2011, 09:08 PM
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Any updates mate?

Not keen on the very plain flush panels, but the concept is great
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Old 02-14-2011, 11:32 PM
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Added:

As a thought, could you not have a fan either end connected via a shaft to spin both?

Craig
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Old 02-14-2011, 11:38 PM
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Great idea snowmobiles have used that set up for years some of those old fan cooled 2stk twins were very dependable Yamaha's Phazer comes to mind.
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Old 02-15-2011, 06:20 PM
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The panels are only for the prototype, they will be nice looking on the final solution.
Testing has shown that we max get 125 degrees C on full throttle in the test stand, ie no cooling from the car moving, we still have some more things try out to make it even better. We are also making a cover as well as we have added another o-ring. We have also tested some different fan types.

Does any one know where we can get fan from a ducted fan unit, or one like this with a turbine like blade setup, but for counter clock wise turning?

Also we have had some problems with our RCMK twins on the crank shaft. 1. It can move about 1 mm forward and backwards. 2. The pressure difference between the two cylinders seem to disturb eachother - espesially by lower RPM.
has anyone the same experience?

Finally we have changes the small link between the two carburators to one that allows play as the carburstors otherwise will have to be very exactly mounted for the throttle to work properly. If anyone has this we can of cause supply this solution.
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Old 02-15-2011, 06:22 PM
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Quote:
Originally Posted by saxtoft View Post
Does any one know where we can get fan from a ducted fan unit, or one like this with a turbine like blade setup, but for counter clock wise turning?
.
What size fan and box would you need?
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Old 02-15-2011, 06:24 PM
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Quote:
Originally Posted by saxtoft View Post
The panels are only for the prototype, they will be nice looking on the final solution.
Testing has shown that we max get 125 degrees C on full throttle in the test stand, ie no cooling from the car moving, we still have some more things try out to make it even better. We are also making a cover as well as we have added another o-ring. We have also tested some different fan types.

Does any one know where we can get fan from a ducted fan unit, or one like this with a turbine like blade setup, but for counter clock wise turning?

Also we have had some problems with our RCMK twins on the crank shaft. 1. It can move about 1 mm forward and backwards. 2. The pressure difference between the two cylinders seem to disturb eachother - espesially by lower RPM.
has anyone the same experience?

Finally we have changes the small link between the two carburators to one that allows play as the carburstors otherwise will have to be very exactly mounted for the throttle to work properly. If anyone has this we can of cause supply this solution.
Sounds good.

Sorry i cant help you on the ducting.

Are there any pictures of the final covering at all?

My concern on this setup would be the first cylinder would be cooler than the second, after air has passed over the first the tempreature of the air would increase meaning the second cylinder would have a higer temp.

The idea is still great non the less!

I would imagine that fan would sound like a bit of a turbo spooling up?

Craig
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Old 03-07-2011, 03:00 PM
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Any updates?
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Old 03-07-2011, 05:43 PM
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We have made som updates like double o-ring connection, a cover, tried out some different fan units, etc. We are gettting there. Cooling temperature is getting lower and lower for every upgrade.
Next we are trying it out in one of our cars. We will upload some more pictures. We also made some modifications to the RCMK twin, like the linkage between the carburators as it does not work properly with the one that comes with the engine.
We are still concerned with some things around the crank shaft. The sealing between the two cylinders is not good enough in our opinion and causes the engine to lose power at lower RPM maybe also further up in the range, as well as the crank shaft can move up to 1 mm in the axial direction. This we are not sure about if it will cause any issues.
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Old 03-07-2011, 09:03 PM
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Quote:
Originally Posted by saxtoft View Post
We have made som updates like double o-ring connection, a cover, tried out some different fan units, etc. We are gettting there. Cooling temperature is getting lower and lower for every upgrade.
Next we are trying it out in one of our cars. We will upload some more pictures. We also made some modifications to the RCMK twin, like the linkage between the carburators as it does not work properly with the one that comes with the engine.
We are still concerned with some things around the crank shaft. The sealing between the two cylinders is not good enough in our opinion and causes the engine to lose power at lower RPM maybe also further up in the range, as well as the crank shaft can move up to 1 mm in the axial direction. This we are not sure about if it will cause any issues.
Sound great!

Upload some pics, lets see!

Craig
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