Warm air blowing hand guards

[c_dug]

I was riding home last night and think I had a good idea but I'm not sure if it would work? If it is terrible feel free to point and laugh.

I was thinking of buying some cheap second hand off-road style hand guards like this:

https://i01.i.aliimg.com/img/pb/573/160/380/380160573_039.jpg

And running some flexible hose (like a hoover pipe) from behind the engine block into the front of the guards so that it blows hot air onto my hands. I would either drill a hole and pop the pipe through or mold a flange and attach the pipe and cable tie it tight.

I'm unsure if the air would be hot enough to counter the minus eleventy temperatures we get at the peak of winter. I'm also unsure if the Venturi effect of the wind over the guards would create a sufficient drop in pressure to draw the air through the pipes? Assuming the air gets hot enough but doesn't suck through the pipes it would be easy enough to wire two small fans to the ends of the pipes. Though fans kind of defeat the object which is a heating method which can be fitted and removed in less than 10 minutes.

I work in a workshop now so I could actually put something together easily enough, probably a bit late for this year but certainly for next winter.

So, thoughts please?
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[P.addy]

Considered this morning. Wouldn't work. No heat was being blown from my engine at 70mph. Physically, it was too hot to touch, no air blowing though.

Muffs and heated grips are the best combination since cheese and marmite.

[UnspeedySam]

Don't know if it would be better than just getting muffs personally.

Yambabe has done something along the same lines: https://www.bikechatforums.com/viewtopic.php?p=1961068#1961068
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[MarJay]

It might work on a Buell where the fan under the seat blows hot air out. You'd need to start with a wide hose behind the radiator, and you'd need to then go down to a narrow hose to get enough speed in the air to transfer any heat to your hands. The handguards wouldn't keep a still enough air pocket behind them to keep your hands warm.

Hoover tubes, sealed at one end with small holes in by your hand might work if you had powerful enough fan to blow the air through the tubes and suck air through the rad. I'm not hopeful though, otherwise lots of other people would have done it.

Heated grips are probably more efficient.
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[N cee thirty]

as said, it sounds very similar to yambabes setup
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[c_dug]

Hadn't seen that before, great minds

Seems like it would works though.
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I am a bellend, I am a man of constant sorrow, I am a gummy bear, I am a rock.

[Rogerborg]

Heated muffs?

Run some hose up from your radiator, bit of copper pipe running around inside muffs, leak, scalding water on your hands OMG IT BURNS IT BURNS IT- crash, giblets everywhere, pics.

https://rogerborg.dnsd.me/do-it-faggot.jpg
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[Moo.]

Yambabe did make some Have a read of that

https://www.therevcounter.com/uk-motorbike-forum/26782-shonktastic-new-way-heating-grips.html
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[thepuma]

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[mysterious_rider]

ive got some handguards you can buy, BRAND new, with the metal brace running inside so really strong.

They are black, £15 posted if you want them..
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[uberkron]

I once made a bodge tastic hot air hand warmer for my first moped, a honda today. Being force air cooled it was easy to divert some hot wind, the tubing was swimming pool vacuum hose, and even at idle it was pleasant. The police thought i was attempting some kind of ram air set up so i removed it. On a bike the speeds are higher and areas of pressure and vacuum are not very easy to see without a wind tunnel.

I like the idea of using engine coolant to heat the bars, would definitely need a control valve on that though. It seems this would be cheaper to do in production than heated grips, but your bars would need a bleed nipple.
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[stonesie]

On a fared bike it could work if you took air from behind the radiator as most of it, including some heat from the headers comes out of the side vents. I can keep my left hand warm by dangling my digits near the vent, shame about the throttle hand.

[Kawksam]

German Army in second World war on the Eastern front with Russia on there BMW and Zunzapps they mounted a pipe off the exhaust going into handle bars effectively early heated grips.

[uberkron]

I once made a bodge tastic hot air hand warmer for my first moped, a honda today. Being force air cooled it was easy to divert some hot wind, the tubing was swimming pool vacuum hose, and even at idle it was pleasant. The police thought i was attempting some kind of ram air set up so i removed it. On a bike the speeds are higher and areas of pressure and vacuum are not very easy to see without a wind tunnel.

I like the idea of using engine coolant to heat the bars, would definitely need a control valve on that though. It seems this would be cheaper to do in production than heated grips, but your bars would need a bleed nipple.
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[Walloper]

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[Walloper]

[trevor saxe-coburg-gotha]

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[MaybeGuy]

If you wanted to put the effort in, water heating would probably work. Wrapping a load of copper piping around the exhaust, along with an electric pump.

https://www.ebay.co.uk/itm/DC-12V-Mini-Electric-Water-Coffee-Pump-24GPH-P-25A-UK-/251212851998?pt=Coffee_Machines_Makers&hash=item3a7d73eb1e
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Kickstart wrote: Hi I tend to agree with Matt. All the best Keith

[andym]

without actually reading the whole thread, so I don't know if anyone has actually mentioned it, but would it not be a little simpler to run a small water pipe up to the hand guards (on water cooled bikes of course)...

For exaple if I was to add a T junction where possible then run a loop to each side of the handlebars, insulated (and hidden) where it's needed, then there would be a supply of warm water running up to the grips, which would radiate the heat because of the lack of air flow (possibly). Also since there would be no real modification it would be simple enough to take the pipes off and refit the old junctions.

Or just buy heated grips and muffs....

Edit, just read it's already been suggested, not sure how it would spray scalding water ovver you though.... all the pipes that's on the bike that could do that then

[recman]

[trevor saxe-coburg-gotha]

Not suitable for wanking?
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"Life is a sexually transmitted disease and the mortality rate is one hundred percent."

Mobylette Type 50 ---> Raleigh Grifter ---> Neval Minsk 125

[mysterious_rider]

[recman]

[andym]