Metal cylinder shrouds?
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Hooked
Rat 2003 Stella 2T; 1979 P125x (in pieces, out for paint)
Joined: 12 Sep 2015
Posts: 273
Location: Madtown
Wed Nov 18, 2020 10:29 am quote
Random thought. I understand that older models had metal shrouds. The p-series on (or maybe earlier) use plastic ones, surely for cost reasons.

What I am wondering--would a metal shroud cool better? I am imagining a metal shroud with fins on the outside to increase surface area, but even without those; the hot air in the shroud would radiate out to the metal shroud and dissipate; the shroud would also presumably touch the cylinder in places, leading to more heat transfer.

Anyone up to making a metal p shroud and testing my theory?
Ossessionato
1980 P200E , 2005 Stella 177
Joined: 20 Jul 2018
Posts: 2342
Location: Staten Island, NY
Style Maven
74 50s x3 78 P200 84 Cosa PK50XL2 58 AllState 68 Sprint 80 50special '66(?) Super125
Joined: 22 Nov 2010
Posts: 7949
Location: seattle/athens
Wed Nov 18, 2020 12:48 pm quote
Yes, your instincts are correct. Plastic is an insulator and metal a much better conductor and will help dissipate heat better, especially if painted flat black. Science.

But I think the fins might be overkill. Still it would be interesting to see what you come up with though if you do go for it.
Enthusiast
'66 Sears Cruisaire Smallframe
Joined: 12 Aug 2019
Posts: 77
Location: York, PA
Wed Nov 18, 2020 1:12 pm quote
Aren't these effectively just duct work to direct the air from the flywheel over the cylinder fins? I would imagine that they do very little of the cooling themselves, but again it's just a guess. It would be interesting to see what the actual difference would be between the two.
Style Maven
74 50s x3 78 P200 84 Cosa PK50XL2 58 AllState 68 Sprint 80 50special '66(?) Super125
Joined: 22 Nov 2010
Posts: 7949
Location: seattle/athens
Wed Nov 18, 2020 1:23 pm quote
I would agree and expect to see little difference, but cooling is cumulative and it all helps if you might be on the edge sometimes. It would be interesting to see if the difference is noticeable. Any volunteers who've compared both on the same motor, who want to say what they think?
Hooked
Rat 2003 Stella 2T; 1979 P125x (in pieces, out for paint)
Joined: 12 Sep 2015
Posts: 273
Location: Madtown
Thu Nov 19, 2020 7:55 am quote
Dammit, one more scooter-related thing I will have to buy. And maybe j-b weld for some fins.
Molto Verboso
2007 Stella 150
Joined: 02 Nov 2019
Posts: 1258
Location: Rochester, Minnesota
Thu Nov 19, 2020 8:11 am quote
yackee wrote:
Dammit, one more scooter-related thing I will have to buy. And maybe j-b weld for some fins.
Get the stainless version of the flywheel and cylinder shroud.
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