insteresting read
11-05-2005, 02:59 PM
#1
Senior Member
Thread Starter
Join Date: May 2002
Location: California
Posts: 22,465
11-05-2005, 03:15 PM
#2
Senior Member
Thread Starter
Join Date: May 2002
Location: California
Posts: 22,465
11-06-2005, 03:29 AM
#6
Senior Member
Join Date: Jun 2004
Posts: 524
There is no doubt, gas flow modeling software that is used by the Formula 1 teams, NASCAR, etc. It would be way too complex to ever reduce to a simple rule of thumb.
Oooh man. Talk about irony.
I don't know about Formula None, but the NASCAR guys realized long ago that for headers that have to fit in an actual chassis, it's kind of pointless, since any bend in the tube will affect how pressure pulses travel and are reflected. They don't seem to care about things many people think are important, like equal length runners. As long as the tubes clear the chassis, and have as few bends as possible, that's all that seems to matter.
And then I see things like equal length shorty V8 headers that look like a knot of earthworms. The NASCAR guys seem to be right, since they rarely make any significant difference over a similar unequal length header.
11-06-2005, 12:51 PM
#9
Senior Member
Thread Starter
Join Date: May 2002
Location: California
Posts: 22,465
Originally Posted by inanimate_object' post='775923' date='Nov 6 2005, 08:01 AM
Yeah, F1 just has very short headers with no resistance/backpressure at all so there's very little point in trying to tune them, but knowing F1 I'd imagine they still spend wads of money on it.
Mark
i read somewhere that one of the teams (i wanna say ferrari) has one guy who builds all the headers, out of iconel, they take 50man hours EACH and are replaced every race (season before last they had a couple failures during the race).
they are a little "weird" BIG diameter primary tubes, and smallish collectors.
on one of his posts that adam fellow mentions tuning the exhaust doesnt matter until you're turning over 10,000 rpms
11-06-2005, 01:18 PM
#10
Senior Member
Join Date: Nov 2003
Location: Ireland
Posts: 907
Originally Posted by j9fd3s' post='776000' date='Nov 6 2005, 06:51 PM
i read somewhere that one of the teams (i wanna say ferrari) has one guy who builds all the headers, out of iconel, they take 50man hours EACH and are replaced every race (season before last they had a couple failures during the race).
they are a little "weird" BIG diameter primary tubes, and smallish collectors.
on one of his posts that adam fellow mentions tuning the exhaust doesnt matter until you're turning over 10,000 rpms
I'm not sure about exhaust tuning being worthless below 10k rpm, I'd like to see his reasoning on that one.
Mark