To me, that is simply amazing! I do not know what kind of cam those guys
run but I suspect it has some overlap between intake and compression
strokes. Lets say maybe 8 degrees although that may not be acccurate.
Then the compression stroke is only an effective 82 degrees and the fire
is being lit only 7 degrees away from intake valve closing. That junk
must be really hard to light and the flame front must be very slow as
well. Ideally the peak pressure would come right at TDC, I suppose, but
I don't really know. Fascinating. Maybe that's why the blower explosions
we occasionally see are so spectacular... Valve hangs just for a
millisecond or two and KaBoom in the manifold.. More to this that I ever
imagined...
mayf.
Skip Higginbotham wrote:
>And...how much ignition advance do they run at 20k to help the flame
>front stay up with the piston speed???? Top Fuel engines run as much
>as 65 degrees to enable 9000 RPM. It's not just VE.
>Skip
>
>
>
>
>At 11:34 AM 4/30/2008, Dave Dahlgren wrote:
>
>
>>Actually Cosworth is over 20k rpm in qualifying trim..LOL 19k is in
>>'endurance trim' LOL
>>Dave
>>----- Original Message -----
>>From: <jgmagoo@comcast.net>
>>To: "land-speed-digest" <land-speed@autox.team.net>
>>Sent: Wednesday, April 30, 2008 2:28 PM
>>Subject: [Land-speed] Torque Drop>From>JG Magoo
>>
>>
>>
>>
>>>Doc,
>>>
>>>You wrote: "if you can keep the cylinders filled"....
>>>
>>>Right there you came very close to answering your own question. ;o)
>>>
>>>Think about this. A current Formula-One V-8, NATURALLY ASPIRATED, turns
>>>19,000 RPM. That means each cylinder needs to be 'completely filled'
>>>158-TIMES PER SECOND!
>>>
>>>Can you immagine a beer-bottle-filling-machine at a brewery trying to fill
>>>158 beer bottles per second?
>>>
>>>At some point, it just can't be done..........and efficiency drops off.
>>>;o)
>>>
>>>JGMagoo
>>>
>>>Can you say, "Suck, Squeeze, Bang, Blow" 158 times per second? ;o)
>>>
>>>
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>>
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