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Equipping the Bike - what's the best gear? Anything to do with the bikes equipment, saddlebags, etc. Questions on repairs and maintenance of the bike itself belong in the Brand Specific Tech Forums.
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Giant Loop Motorcycle Saddlebags & Motorcycle Tank Bags: Panniers, Soft Luggage for Adventure & Sport Touring

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  #16  
Old 24 Feb 2009
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Whichever is chosen, I'm not sure that the insulating/conductive qualities are so important. The effects are margnial IMO.

SS or Alloy may conduct heat bettrer but they are also shiny so they reflect heat radiation back toward the engine. Ply may insulate, but is opaque so does not reflect any heat back.

More importantly, where does an engine generate its heat and where are most of its cooling design traits? The cylinder; some way from the sump... My guess is that engine temps on a moving bike would not differ that much.

Having said all that I would probably choose Ally over ply. In my case its for the sidecar undercariage, and ply is a lot easier to work with than ally and a lot cheaper too. No contest for me, even if it may not look as cool...
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  #17  
Old 24 Feb 2009
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Afterthought - Mollydog's comments on steel bashplates make me think that 1.5-2mm mild steel would deform well under impact and has all the benefits of being easy to weld and shape. Good paint will stop rust.
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  #18  
Old 24 Feb 2009
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Guilt

Please ignore my comments on temps as they only apply to me and my bike. I put a deep sump on a guzzi and fitted an oil filter to the rear of it. The sump is now very low and the bike is vulnerable to stones thrown up in a third world situation, not in Europe. I want to use the bike once in this situation and it'll be summer so the temperature and protection apply to me only on this one trip. Appearances don't matter so I'll use a sheet of ply and chuck it away after the trip. I guess it should be called a stone guard. I was in New Zealand a while ago and ungraded roads wrecked the floor pans and exhaust of cars on them which made me think about the poor oil cooler! Linzi.
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  #19  
Old 24 Feb 2009
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My CCM came with a factory fitted stainless steel bashplate - just a simple flat sheet that covers the bottom of the engine and bends up at the front to protect from stuff thrown up from the front wheel - no side wings etc. It's 2.1mm thick and weighs a ton (you have to take it off to change the oil).

I turned down the offer of a new stainless plate with wings and other bits from someone on the owners club site because of the weight.

2.1mm does seem to be overkill and enough to protect against just about anything that the bike is likely to come up against (although I admit that I'm no expert). Anything that would get past the plate would most likely have completely wrecked the engine. If it just to stop stones etc from damaging the crankcase then half the thickness would probably be good enough.
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  #20  
Old 24 Feb 2009
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Ask the 4WD guys, they prefer steel rims over aluminium, because steel will bend rather than shatter and can be bashed back in shape.
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  #21  
Old 24 Feb 2009
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Thanks everyone for your input, looks like stainless may not be a bad option after all, will see how it goes and post a few pics if everything goes to plan.
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  #22  
Old 24 Feb 2009
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Quote:
For bash plates the deformation of alloy makes it very suitable indeed. Mild steel doesn't have the same ability to absorb energy in big strikes. You're more involved in furniture than I am as I only use it but surely you are doing it an Funny how different peoples' views can be.
no worries linzi, its a good point you made. only used mild steel once to make a botel opener years ago in high school lol even then i remeber thinking "could i use this to make a part for my bike/bicycle" haha
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  #23  
Old 24 Feb 2009
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What do I know?

As others have said mild steel doesn't tear, unlike alloy. I am simply a huge supporter of people who use materials in ways others haven't thought of and wood is one such. Much underestimated ply is environmentally superb. Linzi.
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  #24  
Old 24 Feb 2009
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Ply would work fine for a while but won't cope well with being wet then dry, hot and dry on one side and muddy and wet on the other. Also quite good at soaking up oil which will make it go soft. Might reduce the oil stains on your kitchen floor though
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  #25  
Old 24 Feb 2009
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All good

Yes indeed but I only want stone protection for one trip to north africa--you suggesting Guzzies leak oil then?
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  #26  
Old 24 Feb 2009
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Originally Posted by Linzi View Post
Yes indeed but I only want stone protection for one trip to north africa--you suggesting Guzzies leak oil then?
No, just a reference to my Wife's unrealistic objections to motorbikes in the kitchen. Do Guzzies leak oil then ??
The one that I will never be forgiven for is walking a big dollup of the black crud that collects on the frame near the front sprocket, into the hallway and up the stairs; approx. 20 mins after the carpet fitters had left

Being a chippy and having some experience of plywood boats, I think a good lump of ply as a stoneguard is a cool idea. When I was involved with F1, they had odd bits of ply stuck on the floorpan of the cars as sacrificial guards.
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  #27  
Old 1 Mar 2009
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The biggest problem with plywood will probably be its inability to "slide", thats the area where steel might win out over aluminium.


Maybe
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  #28  
Old 4 Mar 2009
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Hello there,

I am a student aerospace engineering and I've learned a thing or two about material properties. Steel is about three times stronger than aluminium and three times heavier. (Depending on which types of course) The reason aluminium is mainly used to make airplanes is a combination of material properties, but the major reason is that because you need only one third of the thickness of the aluminium version if you use steel, you will have more buckling when the material is under compression, because it is so thin.
So you could use a stainless steel bash plate, and it could be one third of the thickness of a aluminium one, but make sure that it is thick enough to sufficiently resist denting, because you wouldn't want it to bend against your engine with every little stone.
The reason that most bash plates are made of aluminium are probably, weight reduction, corrosion resistance (stainless does not mean that it does not rust!), ease of production/manufacturing and looks.
Another alternative would be plastic bash plates, which can even be stronger than metal ones, provided the correct type of plastic is used. Another would be carbon/kevlar composite, which would be the best way to go, carbon is really very strong, but also brittle, when you combine it with kevlar, it is very strong and no longer brittle, and it is much lighter. The only downside is that it is slightly more difficult to repair (though not very difficult).
Wood on the other hand is an excellent material strength wise, and it is also very suitable for airplanes, the reason it is no longer used for that purpose is that it is more difficult to manufacture, it needs much more maintenance and is not that resistant against outside influences (warm/cold, fire, water etc.) This also applies for motorcycles of course.

So, you could use alloy or stainless steel if you'd want to without much difference in use. If you'd want something else (or better) go for a composite material and if you go for wood, do not expect it to last long.

Just my view on things,
Habicht
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  #29  
Old 4 Mar 2009
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Plywood is a fantastic material especially layered up with balsa (proper aircraft type). This really needs hot bonding, so isn't easy at home. For wooden items at home, try covering in fibreglass resin. It's a true carbon based composite too, so you can impress any rice rocket power ranger type mates down the pub

Andy
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  #30  
Old 4 Mar 2009
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Chairs

I'm looking for an old school chair made of ply. They had a good width and a handy curve. I envisage cutting it off so I have a flat panel with an upswept front. This will be perfect for my bike's shape and the fact that it's recycled and environmentally sound pleases me no end. It's only going to be used on unsealed roads at worst. ( Famous last words, adventurer in blood). Linzi.
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