BA
Pro
Posts: 1592
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posted March 16, 2002 02:24 PM
Any Airflow Dynamics or Physics people here???
I read once in a car magazine tech. article that optimum header/collector length can be determined by painting a white stripe down the collector.
After a full-throttle pass on the road or dragstrip, you were supposed to check that white stripe and see where there was a change to the discoloration. That spot is where the 'collector' should end.
I was thinking that this is probably related to EGT somehow as well.
Anyone care to shed some light or add there thoughts??
  
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kcadby
Pro
Posts: 1733
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posted March 18, 2002 04:04 PM
Don't know BA but...you should have seen the pipe that the ONLY Prostock Kaw to qualify (Geno Scali) at the Gators this weekend had on it 
He KEPT it covered up but one friend of mine got a better look at it than I did (until he asked about it)...
He said it was "sort of like an expansion chamber!"
it was much bigger (than "normal") at the collector then...stepped down to a STRAIGHT end piece...NOT a megaphone...about 3" diameter...
I talked to a guy in his camp (I know HIM from our track) that also said..."there's more to it than what you can see" (even if it wasn't covered up)..
HMMMmmm...he DID run good for a Kawasaki...he qualified #9 with a 7.300 @ 181.35
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Y2KZX12R
Needs a job
CompetitionCNC.com
Posts: 3762
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posted March 19, 2002 11:16 AM
In the past I've used a special marker(paint based)and drawn stripes down the primary tubes and collectors. Now we use an IR temp gun. The temp gun allows exact readings to be taken of the tubes surface temp. Depending on the material, thickness, and time(type of dyno pull)the gas temperature can be calculated.
But on the dyno (for dialing in V8 intake manifolds etc.) we use pyrometers on the dyno that feed data directly to the dyno's computer in realtime. This gives data on an individual cylinder by cylinder basis. Also there is indipendent channels(14) for multiple o2 sensors.
The paint trick works thou.
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Y2KZX12R
CompetitionCNC.com
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