How Much Twist? Place Yer Bets...

MadBill · Post by **MadBill** » Sat Jan 28, 2006 7:47 pm

OK, per my thread on crank twist, I'm now "The guy with the Data"! I locked the flywheel flange and applied 250 lb-ft. to the keyway of a 3.45" standard journal Sonny Bryant SBC (equivalent, per my "...Twist, How Much..." thread, to 550 on the dyno.) How many degrees of twist did I see?
$\:D/$
(Pix ASAP on previous Twist thread)

MadBill · Post by **MadBill** » Sun Jan 29, 2006 8:37 am

Come on you guys! Over 90 views and 9 votes, but not one prepared to go on the record! Maybe I should reveal the answer only by IM to the first 6 to raise their hands...

SteveS · Post by **SteveS** » Sun Jan 29, 2006 8:49 am

There is an adadage that goes something like "there was method to madness". And that is what drove my vote for .5 to 1 degree of twist.

bobqzzi · Post by **bobqzzi** » Sun Jan 29, 2006 10:50 am

MadBill wrote:Come on you guys! Over 90 views and 9 votes, but not one prepared to go on the record! Maybe I should reveal the answer only by IM to the first 6 to raise their hands...

I voted less than 1/2

Post by **SchmidtMotorWorks** » Sun Jan 29, 2006 11:20 am

I'm guessing 2-4

Engineguy · Post by **Engineguy** » Sun Jan 29, 2006 11:25 am

1 to 2

highVE · Post by **highVE** » Sun Jan 29, 2006 3:16 pm

Well w/it being a bryant shaft, i would hope it be less the 1 degree, so by bet is .5 - 1full degree max.

Mike Theroux

#84Dave · Post by **#84Dave** » Sun Jan 29, 2006 3:22 pm

If Bill tells us he 'Broke the ^&#%**' , I'll never build another race engine!

Grocerius Maximus · Post by **Grocerius Maximus** » Sun Jan 29, 2006 3:51 pm

250 ft/lb static twist test on a shaft of that structure and diameter will reveal nearly immeasurable twist. <----WAG

MadBill · Post by **MadBill** » Sun Jan 29, 2006 4:16 pm

Oops! Was supposed to be a PM...

putztastics · Post by **putztastics** » Sun Jan 29, 2006 6:01 pm

Bill please don't get mad.

I voted for >1/2<1 but changed my mind to <1/2 deg

MadBill · Post by **MadBill** » Sun Jan 29, 2006 7:33 pm

Good second guess, Jesse! Guess it's close enough to 24 hours for the poll to reveal that those Bryants are stout pieces: The actual twist was a negligible 0.249 degrees (0.0075" on a 3.45" stroke) Guess we won't be needing any trick sparkers to compensate for that!
Oh well, at least now we know...
Thanks for all the comments and interest guys.

MadBill · Post by **MadBill** » Sun Jan 29, 2006 11:13 pm

Hey! A couple of you guys have voted since I gave the answer! (I suppose you wouldn't have known I did thuogh unless you scrolled all the way down...) Anyway, there were 23 votes before then.

Don Terrill’s Speed-Talk

How Much Twist? Place Yer Bets...

What's your guess?

How Much Twist? Place Yer Bets...