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SuzukiSavage.com
/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> How hot is too hot?? /cgi-bin/YaBB.pl?num=1314650620 Message started by AZSGT on 08/29/11 at 13:43:39 |
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Title: How hot is too hot?? Post by AZSGT on 08/29/11 at 13:43:39 Obviously knowing our bikes are air cooled, they do run a bit hot. and we gauge that heat off the ambient air temperature outside when we are riding. But here in the oven of AZ the ambient temp is sooooo high, is it ever bad for our bikes? Like maybe the bike can't dissipate heat well en ough? Is there ever a time when the outside temp is too much for Thumper???? |
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Title: Re: How hot is too hot?? Post by verslagen1 on 08/29/11 at 13:54:30 Naturally, you're in the best place to find out. Get yourself an oil temp gage, when it reaches 300 °F, that's too hot. Now for my own experience, blazing down the superslab at "65"... getting off the slab and stopping is a no no. You'll burn the inside of your calves in a few seconds. Keep rolling at all costs. I wouldn't even consider shutting her off. Heat soak will surely burn some oil in isolated places. |
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Title: Re: How hot is too hot?? Post by Oldfeller on 08/29/11 at 13:55:34 If you use a synthetic oil such as T-6, you can cook the insides of your legs and the bike could care less .... Dino oil, not so much. Still -- if you are moving it would be hard to kill a Savage from overheating. The only record we have of any heat injury from a normally jetted not overly leaned out engine was a strongly blued pipe and that was on an idling machine left for over a half hour with no air flow. |
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Title: Re: How hot is too hot?? Post by Oldfeller on 08/29/11 at 13:57:17 Verslagen, wasn't some of your oil test data from a stop on the slab? Dig it up and post it again -- it applies doesn't it? |
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Title: Re: How hot is too hot?? Post by verslagen1 on 08/29/11 at 14:04:30 It's getting to be summer again, 100 plus and I don't mean mph. I'll have to get out the IR temp gage again. gotta do it so I have a base line for the cooler anyway. |
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Title: Re: How hot is too hot?? Post by DrunkenDwarf on 08/29/11 at 14:05:35 I have an tangential question: How fast do we have to be moving to prevent too hot? I do not think that going 5 or 10 mph in rush hour traffic is significantly better than idling. (my recently golden pipe tells me so) -D. Dwarf |
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Title: Re: How hot is too hot?? Post by verslagen1 on 08/29/11 at 15:27:12 656C69607A6D69080 wrote:
I've never gone that slow to find out ;D |
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Title: Re: How hot is too hot?? Post by Routy on 08/29/11 at 16:03:20 I have never been convinced that idling produces any hotter combustion chamber temps than any moving speed. Sure, the pipe gets hotter because of hardly any air moving around it. But at idle, the engine is hardly working,...... there is very little fire taking place, and the fire is what makes the heat. I suppose the oil temp under both conditions could tell us something. |
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Title: Re: How hot is too hot?? Post by Serowbot on 08/29/11 at 16:27:30 If it's too hot for me,... then it's too hot for my bike... Usually, in traffic,.. you get an overheat warning,... the valves will get louder, and the bike will feel sluggish... Then, it's time to stop for a refreshing beverage... ;)... Routy,... the bike is air-cooled... no air movement, no cooling... You're such a skeptic... ;D... |
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Title: Re: How hot is too hot?? Post by Routy on 08/29/11 at 19:23:36 the bike is air-cooled... no air movement, --------------------------------------------------- There is air movement. Hot air rises,....remember ;) |
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Title: Re: How hot is too hot?? Post by verslagen1 on 08/29/11 at 19:50:26 6A657F64787E6D6F67697E0C0 wrote:
Convection cooling is not near as good as forced air cooling. Don't believe me? light her up and let her sit. record the temps every 5 minutes. |
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Title: Re: How hot is too hot?? Post by Starlifter on 08/29/11 at 20:56:56 Thank God for the north country, 46 degrees last night, 55 degrees when I went fot a 160 mile ride this morning...front brake pads are shot now after the last 6000 miles. This job is way over due...hope I haven't run the pads down to the rivits. ...always something. |
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Title: Re: How hot is too hot?? Post by built2last66 on 08/30/11 at 03:44:54 Too hot to handle, too cold to hold, they called the Ghostbusters now they're in control.... sorry I just woke up and remembered the Ghostbusters 2 theme song.. I'm worthless and make no sense... but I hope this helps. :D Oh, I do have 1 thing to add since we're on the subject of temp... do you guys drive or recommend driving your Savage with snow on the ground? And I mean in the winter, not actually through the snow... with 10w40 oil :P I live in VA and when I got my bike with 4k miles on it the header was so blue it was purple.. and we have 4 seasons here.. kinda concerned but everyone says that's normal. |
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Title: Re: How hot is too hot?? Post by Routy on 08/30/11 at 04:52:18 2A392E2F303D3B39326D5C0 wrote:
Convection cooling is not near as good as forced air cooling. Don't believe me? light her up and let her sit. record the temps every 5 minutes.[/quote] But how do we compare the "idling" combustion chamber temps w/ the "rolling" combustion chamber temps ? I will almost guarantee you that idling CC temps will never get any hotter than rolling on the slab while the engine is working hard. It will always feel hotter at idle because we are feeling the non moving air, which also makes for blue pipes, but where there is no fire (at idle) there is no heat,....so to speak of CC temps :o |
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Title: Re: How hot is too hot?? Post by Routy on 08/30/11 at 05:10:57 [/quote] Convection cooling is not near as good as forced air cooling. Don't believe me? light her up and let her sit. record the temps every 5 minutes. ------------------------------------------------------------------------- Ok, but as soon as the heat produced equals the heat dissapation, the temp will max out right ? We think of it as no moving air,.....as in no heat dissapation, but in fact there is a lot of heat being dissapated by the rising air. Anyone w/ a "pyrometer" (is it?) on their bike ? That would answer my question. |
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Title: Re: How hot is too hot?? Post by MrBrownTX on 08/30/11 at 06:43:50 6E796560783E606D7F783A3A0C0 wrote:
Love it! ;D |
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Title: Re: How hot is too hot?? Post by engineer on 08/30/11 at 18:12:15 Air cooling is a simple thing but complicated to compute. There are many variables and the velocity and temperature of the air is different at different locations around the engine. If memory serves me correct, in an air cooled forced convection situation, the heat transfer is roughly proportional to the square root of the velocity. So 16 mph is certainly much better than zero. As the speed goes up so does the cooling but at a diminishing rate. This increase roughly matches the engine's need, the faster the engine goes more heat is generated and more air flow is created to help cool it. Same with a lawn mower engine with a fan, the faster the engine runs the faster the fan turns. So in high gear you generally run cooler at a given speed than in a lower gear because you have more air for the RPMs. At some point the ability of the material, aluminum or whatever, reaches its limit of conduction speed from the inside to the outside and additional air speed doesn't help, but I don't think the Savage goes that fast. I know a lot of technical guys are in this forum so let me know if I am wrong about the square root thing. |
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Title: Re: How hot is too hot?? Post by ralfyguy on 08/31/11 at 04:54:58 It's like they said on TV, on how to deal with the record summer heat. One mph air movement can decrease the feels like temperature by four degrees. |
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