Nyper build thread

[Nikolai]

Motor mount bolts ended up a little over 59 grams each.

 

[74Nitro]

Excellent attention to detail!
We need guys like you at Cat/Yamaha sled division R&D

 

[Nikolai]

Welded up the motor mount tabs tonight. Welded both sides of all the tabs except for part of the backside of the outer tab that runs lengthwise on the vertical tube. I know from talking to my engineer buddy that a lot of factors go into how cracks develop such as the HAZ, where you start and stop welds, ect. I have no idea if I did more harm then good welding both sides, won’t know unless I get cracks after awhile.

Those are .090 tabs welded to .049 tube and I guess it’s the chance I take instead of welding .125 tabs to .058 or .065 tube in an effort to keep weight down. Gotta find the threshold somehow.

Only thing left before going back into the jig is my low point drains.

 

[Nikolai]

Plan has always been to cut up my extrusion and make a double pass rear cooler.

Started looking at some other ideas online and I wonder how well a couple 12” dual pass transmission coolers would work? The bungs would need to be made larger but they appear to have large fluid capacity from the pics, diameter is 3”. It would need to weigh the same or less than a traditional cooler. They could be mounted partway recessed into the tunnel and then covered with a thin .030 aluminum shroud to deflect snow on top.

Universal 12" Dual Pass Aluminum Finned Transmission Oil Cooler

Universal 12" Dual Pass Aluminum Finned Transmission Oil Coolers. This transmission cooler offers better cooling than traditional radiator coolers.

www.flashpowerparts.com

The fluid capacity per unit should be about 0.36 gallons so 0.72 gallons for 2 of the 12” coolers.

Any thoughts? Maybe viable? Completely stupid forget it? I don’t have any experience with this kind of cooler.

 

[74Nitro]

I like the idea, but it only has 1/4 fittings?

 

[74Nitro]

I've been looking for ways to add a little more cooling to my winder.

 

[Nikolai]

I was thinking it would be easy to drill out the threads and weld short 1” tubes on for the hoses.

 

[74Nitro]

I was thinking it would be easy to drill out the threads and weld short 1” tubes on for the hoses.

That would work.

 

[kinger]

The only way to know would be to calculate the surface area then compare that to an known size that keeps your particular combination cool.

I am going to try a small car radiator for my build at some point, but only because I don’t want to depend on snow.

 

[Nikolai]

I too would like something less depending on snow. U-cooler extrusion works well but it’s difficult to weld without a bunch of pinholes (for me anyway) and they are cumbersome.

I just don’t know how you would calculate the cooling ability. Extrusion probably has way more surface area per coolant but those Trans coolers have some huge fins on them and hold more fluid.

 

[Nikolai]

My CMX extrusion is 0.69 lbs/FT. It measures 3” wide with 0.375” sides. A foot of it has 81” sq in surface area, fins of course are only on 1 side. The cooler I would make would be a 24” double pass cooler which is 8 ft of extrusion. That would have 648” sq in of surface area and weigh 5.52 lbs.

The round heat exchanger material is 3” diameter which would be 113” of surface area per foot. (2) 12” heat exchangers would only have 226” sq in of surface area but they are double pass so I don’t know how you would take that into account.

I don’t think you would need the same surface area as the flat extrusion because the round will hold more coolant.

A 1 FT piece of CMX extrusion holds 5 oz of water. 8 FT cooler would hold only 40 ounces, that’s only 0.312 gallons of coolant.

(2) 12” round heat exchangers should hold 0.72 gallons of coolant.

So the big question is what’s more affective at cooling?

The round heat exchanger has cooling fins all the way around the outside and inside which the flat extrusion does not.

To add to this, a 12” piece of 1x.058 tube holds about 4.5 oz of water and each one of my 1” frame tubes is 4 ft so just my frame tubes alone(not including the one below the motor which isn’t used if T-stat is open) hold 36 ounces which is 0.28 gallons.

 

[kinger]

I used to be into thermodynamics and have since lost all the exact information, but I think on double pass applications you reduce the sq area by 25%. So basically the double pass through only adds 25% efficiency compared to single pass through. Which is still good you just can’t count double the area on a double pass. The volume of coolant effects warm up and not really efficiencies. In fact smaller volume in the same size exchanger cools faster. So that is why the flat coolers work so well. Your larger tube ones will cool slower.

 

[Nikolai]

Less coolant is less weight as well. I think I will stick to chopping up my CMX cooler.

 

[kinger]

They do suck to weld. I have CR racing do mine because I’m lazy lol

 

[Nikolai]

I’m not looking forward to it. I have enough extrusion to do four 24” passes but I’ll have to butt weld 12” pieces together for two of the passes.

I haven’t welded aluminum in a long time but luckily I have a bunch of scrap pieces of extrusion to practice on.

My 1/8 NPT bungs showed up, will update as soon as I get them welded in.