how hot does the hottest part of the bike get?

[JIBTEXHNKA]

above 451 F, possibly? probably not anywhere close?

[jonathan180iq]

The hottest part is probably right at the bend in the top of the headers. I've never measured it though.

[davidsuserid]

Jonathan is probably right, I accidentally touched that part once (don't ask) and my hand had moved itself back before I even knew what had happened. That was how fast my skin and muscles responded to the heat. And in the 1 second it took me to bring my finger up so I could see it, the blister was already there. It was HOT, and I felt like an idiot afterward for not wearing my work gloves. This happened about 2 weeks ago and I still have the blister on my finger, though it doesn't hurt anymore, it is just healing/going away, still hard cracked skin though.

I have touched many a hot car part, even a cars cat which is one of the hotter places, and it didn't burn nearly as much as that pipe right at the engine. God that was hot, my finger is starting to hurt just thinking about it again.

[JIBTEXHNKA]

i've got a similiar burn from the muffler on my elbow... just barely touched it but it blistered up nicely. don't think it's as bad as yours... but i doubt the end of the exhaust is a whole lot cooler than the beginning (for lack of a technical term which i'm sure exists).

[jonathan180iq]

At least by the time the gases have reached the end of the muffler they have had time to cool down some. The metal at the be bend in the header is in direct contact with the explosive gases right out of the cylinder.

[JIBTEXHNKA]

true... i just doubt your skin really cares all that much about the difference.

[jonathan180iq]

word..

I'd also bet it's hotter than 451

[Orpheus]

Jonathan is probably right, I accidentally touched that part once (don't ask) and my hand had moved itself back before I even knew what had happened. That was how fast my skin and muscles responded to the heat. And in the 1 second it took me to bring my finger up so I could see it, the blister was already there. It was HOT, and I felt like an idiot afterward for not wearing my work gloves. This happened about 2 weeks ago and I still have the blister on my finger, though it doesn't hurt anymore, it is just healing/going away, still hard cracked skin though.

I have touched many a hot car part, even a cars cat which is one of the hotter places, and it didn't burn nearly as much as that pipe right at the engine. God that was hot, my finger is starting to hurt just thinking about it again.

I did the exact same thing a couple of weeks ago while screwing around with my highway bars. It really didn't hurt when it happened, and the blister was more like a really hard callus for the first day or two. After that, it broke open and bled and all kinds of nasty stuff. I've had numerous muffler burns and they don't compare at all with the burn from the header.

[davidsuserid]

Yeah, at the instant it happened, i didn't even feel it, it was a few seconds later when i stood up and started to walk away that it felt like my finger was still touching the exhaust. And it seemed to hurt everywhere else on my finger except at the actual burn.

[music man]

I know that this was mainly Started as a motorcycle related topic but with everyone chiming in on exhaust burns, I

thought I would give you guy's a good one. I work on alot of chainsaws for a living and one day I had been trying and

trying to get one adjusted right and I had it running for about 10 minutes straight trying to get it adjusted right, finally

turned it off set it on my work table, proceeded to sit down on my stool, fell forward, put my hand out and grabbed

nothing but chainsaw muffler. Had a burn in the palm of my hand shaped like the bolt pattern and shape of a

husqvarna chainsaw muffler for like a month.javascript:emoticon(':curse')



later

[BigIron]

I am really interested in how hot the exhaust gets. I just bought some header paint thats rated for 1300-2000 degrees F. I doubt it will handle 2000 F. but thats what the can says. I am planning to do the front portion of the pipes but havn't had the time.
If someone has a thermometer that would measure the header temp I think you would be doing this forum a great service.

[JIBTEXHNKA]

well the reason i asked in the first place was beause i was at work and i didn't bring a lighter... i was trying to find out if i'd be able to light a cigarette on the engine or something. so i'll give it a try later and we'll find out if it's at least about 451, because last i checked that's when paper ignites.

[patrick_777]

Next time I ride, I'll temp it and find a number.

[patrick_777]

Just got back from about 20 minutes of slow speed parking lot practice and about 5 more minutes to get back home at just over 40 mph. I let the bike sit for about 2 minutes while I went into the kitchen to get the infrared thermometer. I ran it over the bike and got a max of 348° right off the cylinder-head to the exhaust pipes. The first bend of the exhaust averaged about 310° and it got progressively cooler farther down the pipe. The outside of the muffler about 3" from the tip was around 190° but the black exhaust port in the end was 297 max°.

The rear of the cylinder-head was the second hottest at around 330° and the side was just over 320°. For reference, the oil filler cap was at max 150°; the block, right below the idle screw was only 145°; and the oil filter cover was only about 140° (this is where my pant leg usually rubs while braking).

Edit: A picture is worth a thousand words:

http://www.idlerants.com/images/gz250_engine_temps.jpg

* Base image "borrowed" from motorcyclecruiser.com (http://www.motorcyclecruiser.com/roadtests/250cc_cruiser_comparison/index.html).

[JIBTEXHNKA]

NICE! :2tup:

thank you very much, that was way more informative than i expected. ha

[jonathan180iq]

Wow. That's good information. Nice work.

[patrick_777]

Just got back in from a 45 minute / ~35 mile ride which consisted almost entirely of "highway" (55 mph) speeds. The temp on the hottest part maxed at 393°F with everything else pretty much staying proportional from this morning's measurement.

[jonathan180iq]

You've done a lot of work on this and at least answered Jib's question.

We now know that he can't light his cigarette on the exhaust...

Poor guy.

[patrick_777]

If only there was some way for him to get the bike to shoot flames out of the exhaust....

:rawk:

[patrick_777]

You've done a lot of work on this and at least answered Jib's question.

Are you saying I have, yet again, gone too far?
;)

[jonathan180iq]

Crank 'er up and spray some starting fluid in there. That should cause a flame or two.

[jonathan180iq]

You've done a lot of work on this and at least answered Jib's question.

Are you saying I have, yet again, gone too far?
;)

No no no.

I was mostly making fun of the fact that this article has gotten a lot of attention just to help Jib light a smoke 'cause he's too lazy to carry a lighter.

For what it's worth, check out this link Jib.
http://www.gstwin.com/cigarette_lighter_install.htm

[JIBTEXHNKA]

If only there was some way for him to get the bike to shoot flames out of the exhaust....

:rawk:


I ACTUALLY TRIED THAT. i was thinking that maybe the actual exhaust fumes might be hotter (which now seems really stupid, especially after seeing that picture) but no luck. then i figured that exhaust fumes probably aren't the best thing to be breathing into my body. then i thought some more and figured that if that's what i'm worried about i should quit smoking; then i got to thinking about which is worse, and i couldn't decide, and now i'm really disgusted.

thanks, guys. jeez. :cry:

hahaha and thanks for the lighter install link; i've been thinking about doing that (and about 100 other things) but it's low on my list right now. although it does look really easy so maybe i should give it a try. i probably need a new battery first... mine dies if you leave the headlight on for more than ten minutes.