SchmidtMotorWorks wrote: ↑Sun May 20, 2018 11:55 pm
Here is how it plays out in a tunnel ram
Jon,
what happens when you change the firing order on this sim with a 7-4 swap, and then the LS firing order (which is really a Cadillac firing order)? Can you run that?
Scotthatch wrote: ↑Mon May 21, 2018 11:41 am
OK ... I have not done car stuff for 10 years as I was to sick and only been here a short time so still getting the lay of the land
OK I ran the numbers on the OP engine using the ram effect calculation I hope it is readable ...rpm comes out to 6887 rpm .... if the plenum is reworked the runner length could be 1/4 shorter or a few rpm higher ... the better the data you put in the more accurate the number will be ........
15269227414950.jpg
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DrillDawg wrote: ↑Tue May 15, 2018 7:16 pm
RPM at peak Horsepower....
(2000/64.5)x 224cfm (375cfm converted from 28" to 10") = 6945rpm
Now I know where it came from.... the manual for the basic flowbench from superflow .... I got one from them when I was looking at benches in the 80's .....
The one I used should be more accurate as it uses more data rather than a constant
15269240732700.jpg
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Well, this is pretty typical of what is (was?) used in Australian V8 Supercars:
Not sure if this is from the same engine - Australian V8 Ford from mid 2000's.
Shows that at 4992rpm there is 3 waves and at 7444rpm 2 waves. Measured compared with simulated.
InletPressure-4992rpm.png
InletPressure-7444rpm.png
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“Ignorance more frequently begets confidence than does knowledge.” -Charles Darwin, The Descent of Man
Well, this is pretty typical of what is (was?) used in Australian V8 Supercars:
Not sure if this is from the same engine - Australian V8 Ford from mid 2000's.
Shows that at 4992rpm there is 3 waves and at 7444rpm 2 waves. Measured compared with simulated.
I do not remember but the sim was adjusted to measure at the same place - it was in 2005 and I am not supposed to publish these but after 13 years and a rule change or two and the team changed engine manufacturer I figured it should be ok.
“Ignorance more frequently begets confidence than does knowledge.” -Charles Darwin, The Descent of Man
vannik wrote: ↑Mon May 21, 2018 2:43 pm
I do not remember but the sim was adjusted to measure at the same place - it was in 2005 and I am not supposed to publish these but after 13 years and a rule change or two and the team changed engine manufacturer I figured it should be ok.
Neels,
That’s what the file name said it was. Thanks for posting those graphs!