Aerodynamics

AllKiller · Post by **AllKiller** » Wed Dec 19, 07 10:36 am

They used Rocket Brand 93 octane....bet that aint 93
Still what ever they did they were making the numbers

Anonymous · Post by **Anonymous** » Wed Dec 19, 07 10:44 am

Would think the twelve :1 bled off far to much D/C , where as the 9.5.1 is the opposite , long durations are a band aid when running pump gas on high compression motors.

Quench is a critical factor regarding detonation.

The O/L period had no bearing on dynamic compression , tis the I/V closure point , a tighter LSA could could fair better than a wider LSA , depending on duration.

Cannonball · Post by **Cannonball** » Wed Dec 19, 07 11:04 am

Adam68 wrote:Would think the twelve :1 bled off far to much D/C , where as the 9.5.1 is the opposite , long durations are a band aid when running pump gas on high compression motors.

Quench is a critical factor regarding detonation.

The O/L period had no bearing on dynamic compression , tis the I/V closure point , a tighter LSA could could fair better than a wider LSA , depending on duration.

have you been quoting all this speccy type stuff to dave bil adam you will boil his brain, he is old school set off high comp pistons big roller cam dommi and lets see what it does

Blue · Post by **Blue** » Wed Dec 19, 07 11:20 am

I was talking to Rob Loring at ICE about compression a few years ago. He told me all the street eliminator engines he builds have 12.1 static compression, all run happily on pump gas. As has been said the "secret" is the cam spec, the point at which you close the inlet valve will dictate the dynamic compression ratio, and that plays a big part in determing the octane requirement. Tight quench is also desirable.

AllKiller · Post by **AllKiller** » Wed Dec 19, 07 4:07 pm

Mmnnn thats interesting

Anonymous · Post by **Anonymous** » Wed Dec 19, 07 4:42 pm

Cannonball wrote:
Adam68 wrote:Would think the twelve :1 bled off far to much D/C , where as the 9.5.1 is the opposite , long durations are a band aid when running pump gas on high compression motors.

Quench is a critical factor regarding detonation.

The O/L period had no bearing on dynamic compression , tis the I/V closure point , a tighter LSA could could fair better than a wider LSA , depending on duration.

have you been quoting all this speccy type stuff to dave bil adam you will boil his brain, he is old school set off high comp pistons big roller cam dommi and lets see what it does

,i think Dave is great , top man , as you would say.

Asked Dave a few times regarding cam selection , also talked to a few others , but no one wants to talk about this 'voodoo' subject (more like not wantin to share

), sooooooo , got some info meself , least i'll know the cam for the stroker will be right , as opposed to using the 'guessing game' or 'one that fits all'.

Back to me book.

BTW Dunc , me brain is like a sponge , what goes in don't come out.

AllKiller · Post by **AllKiller** » Sat Dec 22, 07 10:03 am

Found this bit of Useless, but amzing info out last night......
i could nt believe it, at first, but after seeing some slo mo stuff, im thinking Yep, your probably right !!

What is the most aerodynamic thing on the Planet.....Man Made, Natural or Animal ???

Guy · Post by **Guy** » Sat Dec 22, 07 10:27 am

Wind

AllKiller · Post by **AllKiller** » Sat Dec 22, 07 10:28 am

Ha, Very good answer Guy, but it is a physical thing.

mopar_mark · Post by **mopar_mark** » Sat Dec 22, 07 11:35 am

AllKiller wrote:Found this bit of Useless, but amzing info out last night......
i could nt believe it, at first, but after seeing some slo mo stuff, im thinking Yep, your probably right !!

What is the most aerodynamic thing on the Planet.....Man Made, Natural or Animal ???

Bird ? Dolphin ?

Kev · Post by **Kev** » Sat Dec 22, 07 12:06 pm

Rain drop?

TrevD · Post by **TrevD** » Sat Dec 22, 07 1:05 pm

beat me to it kev

,"The most aerodynamic efficient shape is water drop, whose Cd is 0.05."

Kev · Post by **Kev** » Sat Dec 22, 07 1:22 pm

I refrained from using Google and used me noggin

AllKiller · Post by **AllKiller** » Sat Dec 22, 07 5:58 pm

Its a King Penquin ....sorry

and its a National geographic program i watched

Kev · Post by **Kev** » Sun Dec 23, 07 4:21 pm

Sorry but I stand by my answer.....