Can Anyone Explain PI T/C Pump #s
12-17-2001, 05:41 PM
#1
Can Anyone Explain PI T/C Pump #s I always read about PI coverter pump #s. What do they mean. Not that I would buy a PI, as all my cars are Yanked, <img src="gr_images/icons/wink.gif" border="0"> but I would still like to know what it means when someone talks about a PI with a certain pump #.
Thanks.
Thanks.
12-17-2001, 09:23 PM
#3
Re: Can Anyone Explain PI T/C Pump #s So there is a pump in the converter that determins the stall speed? I thought it was the pitch of the vanes on drive and driven impellers that determine that. I guess I don't understand what in a converter's internals determins stall and what determins STR. Thanks for your reply. That helps, but I would like more tech on this.
12-17-2001, 10:57 PM
#4
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Re: Can Anyone Explain PI T/C Pump #s You can check out Yanks website they have a lot of tech stuff on how converters work.
I think Raughammer has alot of stuff like that on his site as well.
Raughammer's website
I think Raughammer has alot of stuff like that on his site as well.
Raughammer's website
12-18-2001, 12:06 AM
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Re: Can Anyone Explain PI T/C Pump #s [quote]Originally posted by 2xLS1:
<strong>So there is a pump in the converter that determins the stall speed? I thought it was the pitch of the vanes on drive and driven impellers that determine that. I guess I don't understand what in a converter's internals determins stall and what determins STR. Thanks for your reply. That helps, but I would like more tech on this.</strong><hr></blockquote>
The 'drive impeller' is the pump.
Here is a good site describing the operation of a torque converter:
http://www.howstuffworks.com/torque-converter.htm
There seems like there are a lot of things you could vary when designing a torque converter that would affect stall speed and STR: pitch of vanes on pump, stator, turbine; number of vanes on same, diameter of the pump & turbine, etc.
Maybe someone more knowledgeable could explain how each of these factors affect stall speed and STR. i.e. for a given torque convereter, what happens to the stall speed and STR when you increase the pitch on the pump, turbine blades?
All I know is that changing the above mentioned variables will affect the stall speed and STR, but I don't know in what way - In other words, you don't want me designing your torque converter!
<img src="images/icons/confused.gif" border="0"> I'll leave that to the pros...
<strong>So there is a pump in the converter that determins the stall speed? I thought it was the pitch of the vanes on drive and driven impellers that determine that. I guess I don't understand what in a converter's internals determins stall and what determins STR. Thanks for your reply. That helps, but I would like more tech on this.</strong><hr></blockquote>
The 'drive impeller' is the pump.
Here is a good site describing the operation of a torque converter:
http://www.howstuffworks.com/torque-converter.htm
There seems like there are a lot of things you could vary when designing a torque converter that would affect stall speed and STR: pitch of vanes on pump, stator, turbine; number of vanes on same, diameter of the pump & turbine, etc.
Maybe someone more knowledgeable could explain how each of these factors affect stall speed and STR. i.e. for a given torque convereter, what happens to the stall speed and STR when you increase the pitch on the pump, turbine blades?
All I know is that changing the above mentioned variables will affect the stall speed and STR, but I don't know in what way - In other words, you don't want me designing your torque converter!
<img src="images/icons/confused.gif" border="0"> I'll leave that to the pros...
12-18-2001, 06:43 AM
#6
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Re: Can Anyone Explain PI T/C Pump #s [quote]Originally posted by 2xLS1:
<strong>I always read about PI coverter pump #s. What do they mean. Not that I would buy a PI, as all my cars are Yanked, <img src="gr_images/icons/wink.gif" border="0">
Thanks.</strong><hr></blockquote>
Hey now. Don't be bad mouthin them Vigs. <img src="gr_images/icons/wink.gif" border="0"> I occassionally see some strange pump #s in peoples sigs so i'll assume the pump determines the stall. I'll have to read up on the STR issues as this still confuses me.
<strong>I always read about PI coverter pump #s. What do they mean. Not that I would buy a PI, as all my cars are Yanked, <img src="gr_images/icons/wink.gif" border="0">
Thanks.</strong><hr></blockquote>
Hey now. Don't be bad mouthin them Vigs. <img src="gr_images/icons/wink.gif" border="0"> I occassionally see some strange pump #s in peoples sigs so i'll assume the pump determines the stall. I'll have to read up on the STR issues as this still confuses me.
12-18-2001, 07:52 AM
#7
Re: Can Anyone Explain PI T/C Pump #s Rule of thumb:
For a given design, increase the pitch (blade angle) and stall goes down but efficency generally increases. Increase stall and STR slightly increases.
Patrick G is much more into the design elements than me, but to me designing a new converter is as much art as science. About half of the designs Mike has tried didn't make it to market or are no longer offered.
For a given design, increase the pitch (blade angle) and stall goes down but efficency generally increases. Increase stall and STR slightly increases.
Patrick G is much more into the design elements than me, but to me designing a new converter is as much art as science. About half of the designs Mike has tried didn't make it to market or are no longer offered.
