AUTOMOTIVE EXHAUST FLOW AND TEMPERATURE
AUTOMOTIVE EXHAUST FLOW AND TEMPERATURE
(OP)
I need to design an exhaust extraction fan system.
What is the temperature and flow rate exiting the exhaust pipe? Where could I find this information??
Thanks
What is the temperature and flow rate exiting the exhaust pipe? Where could I find this information??
Thanks





RE: AUTOMOTIVE EXHAUST FLOW AND TEMPERATURE
RE: AUTOMOTIVE EXHAUST FLOW AND TEMPERATURE
Barney Demonbreun
Technician for Gary Force Acura, and owner of;
Ashland Motorsports
1304 Big Marrowbone Rd.
Ashland City, Tn. 37015
RE: AUTOMOTIVE EXHAUST FLOW AND TEMPERATURE
Nat. aspirated or blown?
RPM?
Load?
and the list goes on.
Here's your best bet:
run a test. Get a thermocouple and a reader; you can even use one like the Sears DVOM that has a thermocouple reader function.
"One test is worth a thousand expert opinions."
RE: AUTOMOTIVE EXHAUST FLOW AND TEMPERATURE
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: AUTOMOTIVE EXHAUST FLOW AND TEMPERATURE
I believe flow usually works out around 2.2 CFM per horsepower when the exhaust has expanded back to atmospheric pressure. That will be a very rough starting point only. It is usual to have a much larger extraction system than that, and allow plenty of ambient air to bleed into it right at the header discharge point.
RE: AUTOMOTIVE EXHAUST FLOW AND TEMPERATURE
Regards
pat pprimmer@acay.com.au
eng-tips, by professional engineers for professional engineers
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: AUTOMOTIVE EXHAUST FLOW AND TEMPERATURE
"Rob, You forgot - publish your results here and we'll pull them apart."
LOL!
Yes, there's always that!
But to geet back to Pinney's question:
You could always assume 100% volumetric efficiency and sufficient length of pipe to drop the gas temperature to 500 F or so.
E.g., 300 cubic inch engine running 4000 rpm would produce 600,000 cubic inches of exhaust per minute x 1160/560 = 719 cfm.
call it 800 cfm and you should have your dyno room (if that's what it is) covered.
RE: AUTOMOTIVE EXHAUST FLOW AND TEMPERATURE
h
I am not sure what fan would handle that.
Rod
RE: AUTOMOTIVE EXHAUST FLOW AND TEMPERATURE
This is probably more of a rule of thumb type of equation but it has been used longer than I've been around, so it would have been thrown out long ago if it didn't work.
RE: AUTOMOTIVE EXHAUST FLOW AND TEMPERATURE