Nikolai
TY 4 Stroke God
Thats probably the best way to go for preventing ice buildup.
Once I get my turbo hanger tube installed, the steering hoop tubes done, frame out of the jig and fully welded, I can put the frame back in the jig with the motor and finalize motor mounts, drivetrain positioning and lock in the header height. After the header positioning is locked in place I’ll revisit skinning the top. I want to get the remaining frame tubes done and welded so I can wrap up the motor and drivetrain 100%. I’m so close to having that done and I feel like after that it’s all small stuff. That’s going to be huge mental hurdle to have behind me.
Once I get my turbo hanger tube installed, the steering hoop tubes done, frame out of the jig and fully welded, I can put the frame back in the jig with the motor and finalize motor mounts, drivetrain positioning and lock in the header height. After the header positioning is locked in place I’ll revisit skinning the top. I want to get the remaining frame tubes done and welded so I can wrap up the motor and drivetrain 100%. I’m so close to having that done and I feel like after that it’s all small stuff. That’s going to be huge mental hurdle to have behind me.
74Nitro
VIP Member
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- Snowmobile
- 2019 Sidewinder LTX
Did you get that Yamaha rubber bung for the shaft or come up with something else?
Nikolai
TY 4 Stroke God
I have the part# written down you posted. That’s what I’m going to use, just haven’t got around to ordering it yet.
Nikolai
TY 4 Stroke God
Doing some research on thermal transfer of different materials. I was thinking of doing a .040 aluminum shield above the header but titanium has a significantly lower thermal heat transfer, so now I’m wondering if maybe .032 titanium sheet would be better. I could also use it for shielding around the turbo in back and possible around the top of the flex joints. I used stainless steel on my last build to protect my snow pants from the turbo but SS is too heavy for this build.
Need to look at weight of .040 Alu vs .032 Ti and thermal heat transfer of .040 Alu vs .032 Ti.
Need to look at weight of .040 Alu vs .032 Ti and thermal heat transfer of .040 Alu vs .032 Ti.
Nikolai
TY 4 Stroke God
Made up a quick template. About 1/2” wider than the outside edge of the header. I think that would be enough shield and the rest could be CF. The fuel tank will end before the turbo so the there will just be a bent up shield around the turbo. I have .040 and .050 aluminum. Would have to buy titanium if I used that.
Just enough lip on the front to secure the flex joint cover to and have decent access to the clamp bolts.
Any thoughts?
Would aluminum would be adequate protection for the fuel tank?
Width of shield seem ok?
Better ideas?
Just enough lip on the front to secure the flex joint cover to and have decent access to the clamp bolts.
Any thoughts?
Would aluminum would be adequate protection for the fuel tank?
Width of shield seem ok?
Better ideas?
Nikolai
TY 4 Stroke God
Another option slightly larger with less angles.
Clearance to header below fuel tank
Clearance to header below fuel tank
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Nikolai
TY 4 Stroke God
Trying to keep moving. Got the turbo hanger tube done. It’s not in the exact position I wanted and a little low but that was my only piece of 3/4 x .035 long enough for 2 bends so I made it work. Weight for the tube is 0.38 lbs. I will add the tab later after the frame is fully welded and rear motor mounts are done. Installed the oil line to make sure I had adequate room. That socket head bolt in the exhaust flange is from where I was going to hang it and I will swap the bolt out.
kinger
VIP Member
Surprised you are not using a SS V band housing turbine. I won't use cast in my sled, weight savings is significant. I think the heat shield will work fine, remember to line the bottom of your fuel tank with reflective heat tape.
Nikolai
TY 4 Stroke God
I have done zero research on turbos and don’t know much about them. I was using this because I had it already, I didn’t realize there were lighter options available. Any idea what the weight difference is?
kinger
VIP Member
Significant, they say 33% of a normal one, I wish I could find my scale pictures but IIRC that is about 3 lbs, switching to light weight SS housing. Now that forces you into a external WG so that adds some weight back I guess. So maybe 2.5lbs. If you get close to 400 but still over remember this idea 
They run about $400 to buy
They run about $400 to buy
Nikolai
TY 4 Stroke God
That’s a good chunk of weight. I’ll add it to my list of potential weight losses if I’m not below 400 when I’m finished or for later down the road. I’ll never sell the sled so even when it’s finished I’ll still pick away at dropping additional weight.
That shield will be fine for heat protection of tank for sure. Can always enclose tunnel under pipes with CF later if needed.
kennyspec
Expert
Having built a tube frame in the past here's what I would change......id stop here and relocate the turbo. Mount it right behind the engine and make a short manifold for it. Fixes ALL of your icing issues real easy. Top of the tunnel can be a easy 3" lower this way. I think your designing too much around your header and turbo location. With my current tubie the header is under the tunnel but it basically touches the track on the bottom and the tubes on the top. Its going to be removed for a turbo mounted right behind the engine. You have so much room there. Make an aluminum fuel tank that's nice and low. Mount the heat exchanger right under the tank. No worry of oil or coolant lines to the rear of the sled anymore. I understand the work involved to go this far but id highly consider going this route.
I agree. Only issue I see with that is Manifold strength. My buddy constantly cracked the Turbo manifold on his Apex.
kennyspec
Expert
How is manifold strength going to be an issue? Even using 16ga stainless i bet it will be a lot tougher than the factory one he is using now.
