Re: Sprag question!
[Re: VernMotor]
#653436
03/28/10 12:56 PM
03/28/10 12:56 PM
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Joined: Dec 2007
Posts: 10,542
BROOK PARK, OH
WILD BILL
Senior Member of the Junior Dragster Club
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Senior Member of the Junior Dragster Club
Joined: Dec 2007
Posts: 10,542
BROOK PARK, OH
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Stock sprag in mine and was running 11.0's W/ 540P in a2800# car.
Soon to be putting 750 hp to it 
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Re: Sprag question!
[Re: WILD BILL]
#653437
03/28/10 01:42 PM
03/28/10 01:42 PM
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Joined: Nov 2006
Posts: 637
Kokomo,IN
StripeHOG
mopar
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mopar
Joined: Nov 2006
Posts: 637
Kokomo,IN
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my car stock sprag 3400lbs 7.01 96mph 1/8
old mans car stock sprag 3200lbs 6.40 106mph 1/8
Andrew Brough D372
1969 Dodge Dart GTS
1.43 60'best
6.82 1/8 98mph
"the light came on and I ran out of talent"
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Re: Sprag question!
[Re: Quicktree]
#653444
03/28/10 05:06 PM
03/28/10 05:06 PM
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Joined: Aug 2003
Posts: 388
CO
Duster346
super gas
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super gas
Joined: Aug 2003
Posts: 388
CO
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I believe the OP may be asking more about holding power. The 16 element sprag will offer more holding power for sure. You're correct, though, the sprag can fail just as easily in a lower horsepower application. I'd be most concerned with using a valve body that applies the L/R band in 1st, and a billet steel direct drum. 
Chris Andrews
Andrews Racing Transmissions, Inc.
ColoradoDragRacing.com
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Re: Sprag question!
[Re: Duster346]
#653445
03/28/10 05:10 PM
03/28/10 05:10 PM
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Joined: Jan 2003
Posts: 32,394
Quicktree
I Win
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I Win
Joined: Jan 2003
Posts: 32,394
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Quote:
I believe the OP may be asking more about holding power. The 16 element sprag will offer more holding power for sure.
You're correct, though, the sprag can fail just as easily in a lower horsepower application.
I'd be most concerned with using a valve body that applies the L/R band in 1st, and a billet steel direct drum.
that and knowing what to look for and how to drive a non low applied VB. have been driving one for nearly 35 years with out issues. the 12 will give you no more advantage than a stock one.
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Re: Sprag question!
[Re: Leigh]
#653448
03/28/10 08:16 PM
03/28/10 08:16 PM
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Joined: Nov 2003
Posts: 6,293
Rock Springs
Bob_Coomer
master
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master
Joined: Nov 2003
Posts: 6,293
Rock Springs
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In a way I dont get the aftermarket sprag. I guess if you dont have one, and need to buy one. A yearly inspection of a stock unit is ok in my book. The dont prevent any thing period. They might keep the outer race from spinning...thats it. They still come apart, the drum is the main target area. Im no trans guru, but no the inside of my transmission, and know how the one way clutch works, I see no benefits of the bolt in sprag. Just my
[color:"red"]65 Hemi Belvedere coming soon [/color]
[color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]
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Re: Sprag question!
[Re: Bob_Coomer]
#653449
03/28/10 08:42 PM
03/28/10 08:42 PM
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Joined: Jan 2003
Posts: 4,616
Kissimmee Fl.
dusturbd340W5
master
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master
Joined: Jan 2003
Posts: 4,616
Kissimmee Fl.
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 like I said the bolt in units where designed for 1 purpose to save a bad case. I do like and use the Coan 16 roller unit for it does indeed have more holding power.
70 duster full chassis super pro 416 CNC Indybrock heads 727 w/brake
best so far 1.212 60 6.219 in 1/8 at 110.88 9.768 at 137.81 1/4
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Re: Sprag question!
[Re: Bob_Coomer]
#653451
03/28/10 09:56 PM
03/28/10 09:56 PM
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Joined: Jan 2003
Posts: 5,991
Anoka County, MN
Leigh
master
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master
Joined: Jan 2003
Posts: 5,991
Anoka County, MN
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Quote:
In a way I dont get the aftermarket sprag. I guess if you dont have one, and need to buy one. A yearly inspection of a stock unit is ok in my book. The dont prevent any thing period. They might keep the outer race from spinning...thats it.
They still come apart, the drum is the main target area.
Im no trans guru, but no the inside of my transmission, and know how the one way clutch works, I see no benefits of the bolt in sprag.
Just my
Well then, time to attend school. Let's say a unit is behind a street deal, with a non low apply valve body (read: automatic shifted) The trans will be applying full 1st gear load, on the overrunning clutch. Throw in a few thousand on/off throttle loads in drive/first gear, and you might understand the curiculum. ANY units without a low band apply v/b from me, get a Coan overrunning clutch. With my race units, with people I know who aren't strokes, I offer options. If not, 16 all the way. My reputation is worth it.
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Re: Sprag question!
[Re: Leigh]
#653452
03/29/10 07:32 PM
03/29/10 07:32 PM
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Joined: Jan 2003
Posts: 25,920
Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,920
Rio Linda, CA
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Some terms are being used interchangeably here, there is questionable benefit to a bolt-in sprag simply because it bolts in so a bolt-in 12-element sprag has little to offer over the factory pressed-in unit if it's in good shape.
However, when comparing bolt-ins the 16-element has to be better....not because it bolts in but because of the design.
The INTERNET, the MISinformation superhighway
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Re: Sprag question!
[Re: Wicked49670dart]
#653453
03/29/10 07:53 PM
03/29/10 07:53 PM
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Joined: Feb 2007
Posts: 5,080
organ
maximum entropy
master
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master
Joined: Feb 2007
Posts: 5,080
organ
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i've upgraded my transmission as i've made more horsepower, and haven't had any problems- what a novel concept. i now have a 16 element sprag, which has several advantages that i can see. the races are actually billet. more elements = more holding power. 6 mounting bolts versus 4. the thought of a stock sprag gives me the creeps. i've torn down virgin torqueflites (rare anymore) with the stock sprag practically falling out. if i'm making over about 500 hp, and the sprag shows ANY signs of distress or looseness, it gets a bolt in at the least, and i recommend a 16 roller.
for what is the good life if not doing things thoughtfully?
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