Moparts Main Index | READ - Info & Help Page | Moparts Sponsors | Tech Archive

Forums Calendar Active Threads Search Forum Help
Previous Thread
Next Thread
Print Thread
Manual VB 727 line pressure #253887
03/14/09 10:28 PM 03/14/09 10:28 PM
Joined: Aug 2005
Posts: 760
Southington Ct.
T
turbobitt Offline OP
super stock
turbobitt  Offline OP
super stock
T

Joined: Aug 2005
Posts: 760
Southington Ct.
Is there a prefered line pressure for a full manual non-transbrake VB ? I would like to set the pressure a little more accurate than the measurment method described in the kit. Just looking for a ballpark figure. The TV linkage is set for max pressure full time.
Thanks,
Allan G.

1970 Challenger w/572 Hemi street car and my pride and joy. 1986 T-Type with 272 Stage 2 Buick V6 engine - True 8 second street car. Just updated the engine and put down 928 HP @ 35# boost to the ground on chasis dyno. 1976 Cee Bee Avenger Jet Boat - 460 Ford powered.
Re: Manual VB 727 line pressure [Re: turbobitt] #253888
03/14/09 11:39 PM 03/14/09 11:39 PM
Joined: Jan 2003
Posts: 1,812
Portsmouth, VA
D
DusterW2 Offline
top fuel
DusterW2  Offline
top fuel
D

Joined: Jan 2003
Posts: 1,812
Portsmouth, VA
It really depends on HP/torque of the engine. The Turbo Action VBs are around 105 psi, Griner Engineering 140-220 psi. Of course the more pressure, the more load on the pump. If you have a high torque engine, I would set it to around 175 psi, especially with the 904 with small surface area clutches. Lower torque engines, use 105-140 psi.
Re: Manual VB 727 line pressure [Re: DusterW2] #253889
03/15/09 09:07 AM 03/15/09 09:07 AM
Joined: Jan 2003
Posts: 16,928
NC
440Jim Offline
I Live Here
440Jim  Offline
I Live Here

Joined: Jan 2003
Posts: 16,928
NC

For what it is worth, I have my Griner set at 165 psi. I have 5 front clutches in my 727, and a 511 CID engine.

1993 Daytona, 5.50 at 130mph (1/8) 1.19 sixty ft (PG). Link to 572 B1 - Part 1
Re: Manual VB 727 line pressure [Re: 440Jim] #253890
03/15/09 09:16 AM 03/15/09 09:16 AM
Joined: Aug 2005
Posts: 760
Southington Ct.
T
turbobitt Offline OP
super stock
turbobitt  Offline OP
super stock
T

Joined: Aug 2005
Posts: 760
Southington Ct.
Thanks for the replies. This transmission is going behind a roller cam, 572" Hemi. I will check it today and if it is around 150 than maybe I'll leave it alone.

Allan G.

1970 Challenger w/572 Hemi street car and my pride and joy. 1986 T-Type with 272 Stage 2 Buick V6 engine - True 8 second street car. Just updated the engine and put down 928 HP @ 35# boost to the ground on chasis dyno. 1976 Cee Bee Avenger Jet Boat - 460 Ford powered.
Re: Manual VB 727 line pressure [Re: turbobitt] #253891
03/15/09 11:05 AM 03/15/09 11:05 AM
Joined: Jul 2008
Posts: 30,431
Florida STAYcation
BeEtLeJuIcE ! Offline
The village idiot's idiot
BeEtLeJuIcE !  Offline
The village idiot's idiot

Joined: Jul 2008
Posts: 30,431
Florida STAYcation
I have never actually experimented with this ... but with the car I am working on now I will.

I say it depends on what your race-car-combo is. Some might need to run 165 psi ... but with a car that does not weigh much, has better aero than a big-car and does not have a ton of horsepower ..... I think you can run A LOT less.

PLUS ... running not-more-than-you-need line-pressure is EZier on the metal and rubber seals AND it would take less power to run way higher than necessary PSI.

My combo will be a front-motored dragster ... that all I hope it will do is be a mid-9 second "fun car" .....zero maintenence .... "change the oil once a year".

I am going to set my trans at 80 psi or so.
Re: Manual VB 727 line pressure [Re: BeEtLeJuIcE !] #253892
03/15/09 12:48 PM 03/15/09 12:48 PM
Joined: Aug 2005
Posts: 760
Southington Ct.
T
turbobitt Offline OP
super stock
turbobitt  Offline OP
super stock
T

Joined: Aug 2005
Posts: 760
Southington Ct.
I check the line pressure this morning and it was around 95 PSI. I dropped the pan and removed the VB and shimmed the spring with about .200" worth of washers. The was some adjustment left but not much. The spring looks flimsy so I didn't expect much results. After reinstalling the pressure only cam up to 110 psi.
I should also add that it didn't matter how much RPM, or frst, second, or third gear, pressure stayed steady.
Car weight is at 4000 pounds. Engine should be good for 700HP.
Allan G.

1970 Challenger w/572 Hemi street car and my pride and joy. 1986 T-Type with 272 Stage 2 Buick V6 engine - True 8 second street car. Just updated the engine and put down 928 HP @ 35# boost to the ground on chasis dyno. 1976 Cee Bee Avenger Jet Boat - 460 Ford powered.
Post deleted by Defbob [Re: turbobitt] #253893
03/15/09 01:04 PM 03/15/09 01:04 PM

A
Anonymous
Unregistered
Anonymous
Unregistered
A




Re: Manual VB 727 line pressure #253894
03/15/09 02:11 PM 03/15/09 02:11 PM
Joined: Aug 2005
Posts: 760
Southington Ct.
T
turbobitt Offline OP
super stock
turbobitt  Offline OP
super stock
T

Joined: Aug 2005
Posts: 760
Southington Ct.
I've been looking for pressure regulator springs and can't find any. May need to call around tomarrow.

1970 Challenger w/572 Hemi street car and my pride and joy. 1986 T-Type with 272 Stage 2 Buick V6 engine - True 8 second street car. Just updated the engine and put down 928 HP @ 35# boost to the ground on chasis dyno. 1976 Cee Bee Avenger Jet Boat - 460 Ford powered.
Re: Manual VB 727 line pressure [Re: turbobitt] #253895
03/15/09 03:28 PM 03/15/09 03:28 PM
Joined: Feb 2003
Posts: 12,675
Columbia, CT
M
moper Offline
I Live Here
moper  Offline
I Live Here
M

Joined: Feb 2003
Posts: 12,675
Columbia, CT
I'm confused... Why did you need to shim? It's a screw to preload the pressure relief spring... Or is this some other valve body design?

Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.
Re: Manual VB 727 line pressure [Re: moper] #253896
03/15/09 05:18 PM 03/15/09 05:18 PM
Joined: Aug 2005
Posts: 760
Southington Ct.
T
turbobitt Offline OP
super stock
turbobitt  Offline OP
super stock
T

Joined: Aug 2005
Posts: 760
Southington Ct.
Quote:

I'm confused... Why did you need to shim? It's a screw to preload the pressure relief spring... Or is this some other valve body design?



I shimmed because it was already adjusted almost 3/4 down to the end. The shims gave me more preload than going completely to the end of the adjustment.
Allan G.

1970 Challenger w/572 Hemi street car and my pride and joy. 1986 T-Type with 272 Stage 2 Buick V6 engine - True 8 second street car. Just updated the engine and put down 928 HP @ 35# boost to the ground on chasis dyno. 1976 Cee Bee Avenger Jet Boat - 460 Ford powered.
Re: Manual VB 727 line pressure [Re: turbobitt] #253897
03/15/09 05:24 PM 03/15/09 05:24 PM
Joined: Jul 2008
Posts: 30,431
Florida STAYcation
BeEtLeJuIcE ! Offline
The village idiot's idiot
BeEtLeJuIcE !  Offline
The village idiot's idiot

Joined: Jul 2008
Posts: 30,431
Florida STAYcation
Quote:



Car weight is at 4000 pounds. Engine should be good for 700HP.
Allan G.



If yours is OK with 700 hp and pulling 4,000 lbs ....I should be good-to-go with 50-60 psi.
Re: Manual VB 727 line pressure [Re: turbobitt] #253898
03/15/09 08:05 PM 03/15/09 08:05 PM
Joined: Jan 2003
Posts: 16,928
NC
440Jim Offline
I Live Here
440Jim  Offline
I Live Here

Joined: Jan 2003
Posts: 16,928
NC
Quote:

Thanks for the replies. This transmission is going behind a roller cam, 572" Hemi.

There is more to it than just line pressure, the entire trans build and valve body comes into play. For that big motor and heavy vehicle, I would want a valve body designed for at least 120 psi, and prefer 5 clutches in the front drum. Just my opinion. I don't know what valve body you have, but it sounds like a modified stock one. Call John at CRT and order one of his valve bodies.

If you really want to experiment, he might sell you one of his regulator springs.

http://coperacingtrans.com/
Re: Manual VB 727 line pressure [Re: 440Jim] #253899
03/15/09 08:39 PM 03/15/09 08:39 PM
Joined: Feb 2003
Posts: 12,675
Columbia, CT
M
moper Offline
I Live Here
moper  Offline
I Live Here
M

Joined: Feb 2003
Posts: 12,675
Columbia, CT
turbo, are you sure the pump is good and the bushings/sealing rings are working properly? Seems like a ton of preload to get it to work.

Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.
Re: Manual VB 727 line pressure [Re: moper] #253900
03/15/09 09:23 PM 03/15/09 09:23 PM
Joined: Aug 2005
Posts: 760
Southington Ct.
T
turbobitt Offline OP
super stock
turbobitt  Offline OP
super stock
T

Joined: Aug 2005
Posts: 760
Southington Ct.
Quote:

turbo, are you sure the pump is good and the bushings/sealing rings are working properly? Seems like a ton of preload to get it to work.


Pump is good. New babbit converter bushing installed. Teflon sealing rings also. Pressure is consistant in all forward gears and rock steady.

Quote:

There is more to it than just line pressure, the entire trans build and valve body comes into play. For that big motor and heavy vehicle, I would want a valve body designed for at least 120 psi, and prefer 5 clutches in the front drum. Just my opinion. I don't know what valve body you have, but it sounds like a modified stock one. Call John at CRT and order one of his valve bodies.



The transmission is built up with good components. It has a 5 disk direct with Alto red eagle clutches. 4.2 lever with solid red eagle wide band. Completly rollerized including thrust, tail support and output yoke. Bolt in super sprag as well. The VB is a modified stock unit built by a reputable vender that I won't name. It looks like a modified TF-3 kit when I inspected it but without the blue PR spring. I have built a lot of these for myself over the years but never actually measured the pressure with a gage. I always trusted the adjustment method given by the instructions. In this case, it was preset by the vendor who sold this to me.
Allan G.

1970 Challenger w/572 Hemi street car and my pride and joy. 1986 T-Type with 272 Stage 2 Buick V6 engine - True 8 second street car. Just updated the engine and put down 928 HP @ 35# boost to the ground on chasis dyno. 1976 Cee Bee Avenger Jet Boat - 460 Ford powered.
Re: Manual VB 727 line pressure [Re: turbobitt] #253901
03/16/09 06:33 AM 03/16/09 06:33 AM
Joined: Mar 2004
Posts: 702
OZ
C
CRIKEY Offline
super gas
CRIKEY  Offline
super gas
C

Joined: Mar 2004
Posts: 702
OZ
Interesting how alot of you guys use GRINER Vb's & always state your transmissions run flawlessly yet you tell this guy to buy someone eles product??

Do yourself a favour & contact 727 specialist on this board & he will hook you up with a GRINER VB
Re: Manual VB 727 line pressure [Re: CRIKEY] #253902
03/16/09 12:06 PM 03/16/09 12:06 PM
Joined: Feb 2003
Posts: 12,675
Columbia, CT
M
moper Offline
I Live Here
moper  Offline
I Live Here
M

Joined: Feb 2003
Posts: 12,675
Columbia, CT
I'm getting out of my league admittedly at this point. But it seems like if you can't get past 110 psi, steady or not, with 3/4" of air behind the preload plate, plus .220 of shim, it seems you have leakage somewhere in the system. Maybe John Kunkel or Cope can chime in on that.

Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.

Moderated by  Al_Alguire, Hotwheelsjr, moparts, not_a_charger, RangerDan440, tboomer 
Privacy Policy · Forum Rules · Mark All Read Contact Us · Moparts




Moparts Main Index | READ - Info & Help Page | Moparts Sponsors | Tech Archive


Powered by UBB.threads™ PHP Forum Software 7.7.1