How much heat does an SC12 produce?

[Devils]

Hey guys,

Just hoping that someone can tell me straight up what kind of temps the S/C either gets up to itself (as in surface temp), or how hot the charge gets up to at 12psi?

Need to know because the flash point of something is around 500-600 deg C.

Cheers,
Craig.

[roadsailing]

i'd guess less than that, but look up the melting point of teflon, cause i hear it likes to melt off the rotors when boosted too high

[Devils]

haha well Teflon has a melting point around 350 deg c. So i should be all good then.

EDIT: It's even lower than that! At 327 deg c. But the 'highest service temp' is 260 deg c.

[oldcorollas]

what has a flash point of 500-600C?
kerosene has flash point of about 50C.. and auto-ignition temp of 220 or so..
and nylon has flash point of about 500C...

[Devils]

A gas...

Why do you need to know? Your not answering my thread

[oldcorollas]

err....

aluminium melts around 600-700deg.. how is that for answer?

now.. gases don't actually have a flash point
they have "lower flammability limit" and "lower explosive limit"

hmm, i wonder what gas it is can't be carbon based, as their flashpoints are all low...
even gear oil has a flashpoint around? 400?
http://www.engineeringtoolbox.com/fl...els-d_937.html

nitrous isn't flammable, it only decomposes (and if you are thinking of nitrous, yoou should think about the catalytic decomposition in presence of aluminium, and the effect of having high oxygen and aluminium together with heat )

can't be elemental gas as none are useful/cheap enough...

c'mon,, tell em the gas

sure you are not getting your terms mixed up?


and it depends on what pressure you spin the charger... perhaps you could hope for temsp around 100-120 if lucky.. but going for higher pressures (14+) may result in 200+ temps..

[Draven]

you're such a bully OC

[oldcorollas]

i prefer to think of it is "cutting through the bullshit"
facts never get in the way of a good story anyhoo...


anyway, i'm just curious as to what flammable liquid could have a flash point that high? maybe road tar?
as for gas.. most flammable gases that i know of will have an auto ignition temperature much much lower than the melting point of aluminium

[deviant]

On an AW11 MR2 with a 4AGZE intake temps can apparently get as high as 120c.

I wouldnt have the foggiest how hot the actual unit gets...certainly not as high as your mystery gas needs to go bang.

[kAm]

i measured intake temps. its not perfect but a lil guide. on stock boost on afm ae92 gze. intake temp was about 4degrees over ambient temp. this was measured on the outlet of the stock top mount. on idle the intake temp would jump to 80degrees but after 5mins driving it would go back down. water spray on top of the cooler managed to drop it down by 2degrees.
i was going to measure the inlet temp on the cooler but i killed the reader......

[LeeRoy]

I think you need to narrow down your question or get results that are very specific in their answers. I'd be more focused on something like testing the standard setup in a gze ie no bigger cooler, new piping etc, then tailor the question to ask what temps are reched at what rpm, what psi, ambient temp, speed of vehicle, and so on.

Someone could easily chime in much like above and tell you the charger or the temp gets to such and such a temp but the problem is that these answers have no benchmark and cannot be compared. You'll also find the answers presented or found will be more accurate and you'll be able to work out your question regarding this mystery gas.

[Devils]

Nar i got my answer pretty much from the first reply thanks!

I was just playing with OC, he likes it!

I'm going to be running Hydrogen into the intake, and i wasn't sure what the S/C was like for temps compared to a turbo (obviously much much better). Some turbos were getting surface temps of near 200deg *apparently* but my setup in the 180 proved very good and i wasn't worried about any pre-ignition!
I was originally told that the flash point of hydrogen was 370ish degrees which initially had me worried about running it on a 'charged' engine.

Thanks LeeRoy but a vague question usually just requires a vague answer with a bit of thought put into it. I.e. stock engine with 12psi SC12 *shrugs* at full tromp. As that's when it'll be at it's hottest!

[oldcorollas]

err....
let me just suggest...

hydrogen CAN and probably WILL ignite when above 5% by volume, and in contact with 200deg surface (maybe 150).
in an old lab, we had an explosion when someone purged air with anArgon-hydrogen mixture, in a furnace that had cooled to about 200deg....

hydrogen has no flash point .
the auto ignition point is 520degC... but this is the gas itself..　a surface may not need to be at 500deg to ignite it. especially in contact with some metals, the combustion reaction is catalysed.
flammability limits for hydrogen are 4-74% by volume
explosive limits are 15-59% by volume

oh, i lied... the flashpoimnt for hydrogen is MINUS 253degC... ie.. 20 kelvin... i didn't think it was relevant to a supercharger

anyway, just remember.. the auto-igntion temperature (as you seem to be referring to..) is in the ABSENCE of an ignition source... ie only gas.
when you have an ignition source/surface.. the ignition temperature can go down...
and remember you may have very localised heating points.. like the exit of the SC where the air is pumping backwards and forwards every revolution...



anyway.. when you put hydrogen (that hasn't leaked out of your metal-metal fittings ) into your forced induction motor.. please take a video

(ps, you should be thinking abotu what temp your exhaust valves are.. not the SC)

[Devils]

I've not had a problem running it on my SR20DE+T! I will be putting videos up once i get the system up and going.

Would the exhaust valves hold more heat than say the piston top?

I'm trying to figure out how much is too much.

I.E. how much hydrogen i can add into a combustion cycle. I'm always going to have more O2 than quantity of H2

So would adding MORE H2 gas change the ignition point?

[roadsailing]

are we talking "brown's gas" here?