Coan super sprag for street, strengths/drawbacks?
#954619
03/20/11 05:08 PM
03/20/11 05:08 PM
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Lee446
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69 Satelite,528 hemi. This is mainly a street car and still uses a modified vb that retains auto function. Short story, went to a regional outlaw track for a fun run/race. Poor track prep, hooked hard on drag radials, got out about 30 ft and the tires broke loose/hooked up again and busted my sprag. In thirty years of street driving and bracket racing, this is the first time that I broke a trans and don't want to repeat it. Would upgrading to the Coan super sprag be a worthwhile investment? Are they just harder to break, or virtually unbrakeable? Do you have to do any other mods to use one? I looked on their site and read the instructions and it is basically a bolt in, I have a good torqueflite guy who builds my transmissions. I really dont know much about automatics, so any advice is welcome! Thanks, Lee.
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Re: Coan super sprag for street, strengths/drawbacks?
[Re: dIc dOc Deity !]
#954623
03/20/11 10:30 PM
03/20/11 10:30 PM
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dusturbd340W5
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well I can tell you that the Coan super sprag is using the sprag out of a ford c-6 trans and in 25 years in the business I have never seen a c-6 roll a sprag like the stock 727 do and that is because like stated above there are more rollers and there is just not enough room to roll them. They are the only bolt in sprag that does anything for you other than save a bad case.
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: Coan super sprag for street, strengths/drawbacks?
[Re: dusturbd340W5]
#954625
03/21/11 01:09 AM
03/21/11 01:09 AM
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JohnRR
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Quote:
They are the only bolt in sprag that does anything for you other than save a bad case.
The A+A sprag is different than the COAN but has more rollers also , I'm not familiar with the Coan but I can't see the A+A rolling over either .
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Re: Coan super sprag for street, strengths/drawbacks?
[Re: Leigh]
#954627
03/21/11 10:26 AM
03/21/11 10:26 AM
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JohnRR
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Quote:
They both are 16 element.
I thought one had more than the other , if not then there isn't much difference then ... I guess ?
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Re: Coan super sprag for street, strengths/drawbacks?
[Re: dusturbd340W5]
#954630
03/21/11 11:23 PM
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JohnRR
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Quote:
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.... so the Coan sprag for a TF is an exact C-6 piece ?
Yes a Coan sprag come with a new inner and outer race that uses a C-6 sprag assembly.
I think what the protologist is asking is if the entire assembly is a C6 piece and from your answer it is NO .
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Re: Coan super sprag for street, strengths/drawbacks?
[Re: JohnRR]
#954632
03/22/11 11:46 PM
03/22/11 11:46 PM
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Joined: Jul 2008
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dIc dOc Deity !
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Quote:
protologist
U R a piece of wurk RR ... you said you blocked me months ago .. but now you follow-me-around like a little puppy-dog SMELLING around the "protologist" area ....
FIND another hobby RR ... you are BUSTED ...
.... and BTW ....the correct spelling is PROCTOLOGIST..... NUMBnutz ..
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Re: Coan super sprag for street, strengths/drawbacks?
[Re: dIc dOc Deity !]
#954633
03/23/11 09:46 AM
03/23/11 09:46 AM
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JohnRR
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Quote:
*** You are ignoring this user ***
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Re: Coan super sprag for street, strengths/drawbacks?
[Re: Clanton]
#954637
10/13/11 05:10 PM
10/13/11 05:10 PM
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Joined: Mar 2004
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lowflyingdart
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Put in either the Coan or the A&A 16 element sprag. It will be just fine on the street. The only draw back is cost. We had a customer break a rear end with a 727 and a Coan Supersprag. The Sprag held, but was damaged. Most importantly it held and didn't overrun the drum. Larry
"I have not failed. I've just found 10,000 ways that won't work."
Thomas A. Edison
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Re: Coan super sprag for street, strengths/drawbacks?
[Re: lowflyingdart]
#954639
10/13/11 05:16 PM
10/13/11 05:16 PM
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Clanton
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Quote:
Put in either the Coan or the A&A 16 element sprag. It will be just fine on the street. The only draw back is cost. We had a customer break a rear end with a 727 and a Coan Supersprag. The Sprag held, but was damaged. Most importantly it held and didn't overrun the drum. Larry
mine is not for street use[heavy car3900# 1,000+ HP]
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Re: Coan super sprag for street, strengths/drawbacks?
[Re: 440Jim]
#954641
10/14/11 12:18 AM
10/14/11 12:18 AM
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dennismopar73
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all these do help but if and its always a matter not if , but when it goes it will take anyones sprag! most time the trannys junk either way, just make sure you run a shield!
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Re: Coan super sprag for street, strengths/drawbacks?
[Re: dIc dOc Deity !]
#954642
10/14/11 08:17 AM
10/14/11 08:17 AM
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Challenger 1
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Quote:
I think that the aftermarket sprags are just another way dip-DEEP into your wallet.
I would just INSIST on better track-prep ....
.
Always thinking someone is trying to rip him off, it get so old...
Yea sure there gonna prep the track better because you have weak trans, yea right.
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Re: Coan super sprag for street, strengths/drawbacks?
[Re: Challenger 1]
#954644
10/14/11 01:01 PM
10/14/11 01:01 PM
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Quote:
Quote:
I think that the aftermarket sprags are just another way dip-DEEP into your wallet.
I would just INSIST on better track-prep ....
.
Always thinking someone is trying to rip him off, it get so old...
Yea sure there gonna prep the track better because you have weak trans, yea right.
READ AGAIN
Short story, went to a regional outlaw track for a fun run/race. Poor track prep, hooked hard on drag radials, got out about 30 ft and the tires broke loose/hooked up again and busted my sprag
It was for FUN run not the world finals... track prep is usually 60' at your own risk.
I think the sprang and a griner V/B aka low band apply will be all the insurance you will need
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Re: Coan super sprag for street, strengths/drawbacks?
[Re: Challenger 1]
#954645
10/14/11 01:12 PM
10/14/11 01:12 PM
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dIc dOc Deity !
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The village idiot's idiot
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Quote:
Quote:
I think that the aftermarket sprags are just another way dip-DEEP into your wallet.
I would just INSIST on better track-prep ....
.
Always thinking someone is trying to rip him off, it get so old...
Yea sure there gonna prep the track better because you have weak trans, yea right.
ChallyNONE ... why do you keep tryin' to bust-my-stones ? ESPECIALLY when you live-in such a glass-house(being in the LPG reselling biz) ... the most complained about energy supplier in the nation ...
AND now with your MAN CARD revoked ...
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Re: Coan super sprag for street, strengths/drawbacks?
[Re: hemi-itis]
#954646
10/14/11 01:18 PM
10/14/11 01:18 PM
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Joined: Jul 2008
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dIc dOc Deity !
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Quote:
Doc is just bein' thrifty There are no drawbacks for an aftermarket sprag.
..and the hemi- should go on a gauge-weight DIET ! ..... ONLY reason to go to a aftermarket sprag is if your case is damaged and you can't use a OEM piece.
BUTTTT ... there IS a draw-back ...you are emptying your wallet uNnecessarly .... but if you want to spend your money IN ANY WAY you see fit ... go-ferr-it
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Re: Coan super sprag for street, strengths/drawbacks?
[Re: dIc dOc Deity !]
#954647
10/14/11 01:36 PM
10/14/11 01:36 PM
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Joined: Feb 2005
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Quote:
Quote:
Quote:
I think that the aftermarket sprags are just another way dip-DEEP into your wallet.
I would just INSIST on better track-prep ....
.
Always thinking someone is trying to rip him off, it get so old...
Yea sure there gonna prep the track better because you have weak trans, yea right.
ChallyNONE ... why do you keep tryin' to bust-my-stones ? ESPECIALLY when you live-in such a glass-house(being in the LPG reselling biz) ... the most complained about energy supplier in the nation ...
AND now with your MAN CARD revoked ...
Very successfully I might add for 27 years now! What have you done sucessfully Doc?
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Re: Coan super sprag for street, strengths/drawbacks?
[Re: Challenger 1]
#954648
10/14/11 01:45 PM
10/14/11 01:45 PM
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Joined: Jul 2008
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dIc dOc Deity !
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Yeah ... you should have had your MAN CARD revoked YEARS ago .. What I have I done successfully ? ... ran a WORLD FAMOUS fiberglass business for years. And lately ? ... bought a few shares of Apple stock .... And I would not BE PROUD of LPG reselling ... they are famous for ripping-people-off. LOOK UP the Michigan AG records for the largest fine ever levied and paid ....Inergy PROpain ! WHY do you INSIST on getting and every time you come-after me ? You MUST like it .....
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Re: Coan super sprag for street, strengths/drawbacks?
[Re: Challenger 1]
#954649
10/14/11 01:46 PM
10/14/11 01:46 PM
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Joined: Nov 2005
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Bottom line: your sprag is less likely to fail if it's a bolt-in. They're not that expensive and there really is no drawback in using one.
"When I'm in a slump, I comfort myself by saying if I believe in dinosaurs, then somewhere, they must be believing in me. And if they believe in me, then I can believe in me." - Mookie Wilson
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Re: Coan super sprag for street, strengths/drawbacks?
[Re: 440Jim]
#954652
10/14/11 03:13 PM
10/14/11 03:13 PM
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imfixinmopars426
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what a bunch of babies....geez. back to the sprag; my understanding is; 1. add a bolt in to prevent the oem from spinning in the case,or damaged case from one already spun 2.buy a "good" bolt-in if hi hp levels,[added rollers] more $$$$ 3.the cheap four bolts are avalible,for home do it your selfers 80.00\ and they have ferrels to kinda take up the hole to bolt slop 4.good ones have shoulder type and added number of rollers [c-6 unit] have CRT do the trans.. ...mike
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Re: Coan super sprag for street, strengths/drawbacks?
[Re: Lee446]
#954654
10/14/11 05:00 PM
10/14/11 05:00 PM
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Joined: Jan 2003
Posts: 25,618 Rio Linda, CA
John_Kunkel
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Quote:
69 Satelite,528 hemi. This is mainly a street car and still uses a modified vb that retains auto function. Short story, went to a regional outlaw track for a fun run/race. Poor track prep, hooked hard on drag radials, got out about 30 ft and the tires broke loose/hooked up again and busted my sprag.
If the VB "retains auto function" it would still apply the rear band in 1st. Were you in Drive when the sprag failed?
The INTERNET, the MISinformation superhighway
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Re: Coan super sprag for street, strengths/drawbacks?
[Re: Clanton]
#954656
10/15/11 11:57 AM
10/15/11 11:57 AM
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Lee446
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Boy, this got resurected from way back! To answer your question John, yes, it was in drive. I have a 6500 governer in it and that is why I have a auto VB in it, so I can let it do its thing. I don't want to give up the column shift, which I have never been able to get tightned up enough to feel confident manually shifting without overshooting and I don't want a MVB. With a wedge, the car was deadly consistant in drive bracket racing, and I used it that way for years with no problems. I'm beginning to think I was just real lucky!
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Re: Coan super sprag for street, strengths/drawbacks?
[Re: Lee446]
#954657
10/15/11 05:00 PM
10/15/11 05:00 PM
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Joined: Jan 2003
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John_Kunkel
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If you make a conscious decision to leave the line in Drive you risk losing the sprag...no matter who makes it.
The INTERNET, the MISinformation superhighway
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Re: Coan super sprag for street, strengths/drawbacks?
[Re: 440Jim]
#954659
10/15/11 09:20 PM
10/15/11 09:20 PM
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JohnRR
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Quote:
Back to the topic at hand... (please)
Quote:
John, Does the A&A Ultimate Sprag use 1/4 bolts with compression ferrels? The Coan says it uses 8mm shoulder bolts, and the case bolt holes need to be enlarge since that is slightly larger than the stock 727 5/16 bolts that thread into the case (not the sprag).
Sorry Jim I missed this question the first time around ....
Yes the A+A uses the 1/4" bolts and ferrules , I also machine the case and add the 2 extra bolts that the A+A allows you to use because it is a 6 bolt.
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Re: Coan super sprag for street, strengths/drawbacks?
[Re: Clanton]
#954661
10/15/11 11:33 PM
10/15/11 11:33 PM
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Leigh
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For what it's worth, those shoulder bolts from Coan are not the best. The broach of the internal hex, is iffy, at best. The last one I used (3rd unit), I made my own spacers, out of steel tubing (like I have since 1978). MUCH better fit, and no worries about stripping the internal hex for the next builder to hassle with. Also, I personally don't see the need to add the extra 2 bolts. Any application that can sheer off 4 bolts, should have a low band apply V/B anyway.
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Re: Coan super sprag for street, strengths/drawbacks?
[Re: Leigh]
#954663
10/17/11 01:29 PM
10/17/11 01:29 PM
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440Jim
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Quote:
For what it's worth, those shoulder bolts from Coan are not the best. The broach of the internal hex, is iffy, at best. The last one I used (3rd unit), I made my own spacers, out of steel tubing (like I have since 1978). MUCH better fit, and no worries about stripping the internal hex for the next builder to hassle with.
Thanks for the info/experience. Did you use 1/4 bolts instead of the shoulder bolts and drill the case to 5/16 and make a sleeve to fill the case and fit the 1/4" bolts nicely? Is the Coan race tapped 1/4-28?
The shoulder bolts look like a good idea, but if the hardware is marginal, that defeats the improvement. Although I don't like the compression ferrels to fit smaller (i.e. 1/4") bolts into the case, I have never heard of any problems with them. And many standard bolt-in sprags use that method.
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Re: Coan super sprag for street, strengths/drawbacks?
[Re: JohnRR]
#954664
10/17/11 06:32 PM
10/17/11 06:32 PM
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Bottom line: your sprag is less likely to fail if it's a bolt-in. They're not that expensive and there really is no drawback in using one.
Only half correct , The facory type sprag wit ha bolt in outer race will still fail by having the rollers rollover , the Cona or A+A sprag has more rollers so it is virtually impossible to have the rollers fail.
Just replacing the outer race to a bolt in type on a trans that has not had the outer race spin in the case is a waste of time and money.
You make a good point about the roller rollover, but even if the outer race has never been spun, installing a bolt-in sprag will still lessen the chance of it ever spinning (the force required would need to be much greater).
"When I'm in a slump, I comfort myself by saying if I believe in dinosaurs, then somewhere, they must be believing in me. And if they believe in me, then I can believe in me." - Mookie Wilson
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