4l80e dual feed
02-06-2015 | 10:20 PM
#11
Is there a way to dual feed the directs without plugging that feed hole in the case? I was told by a local builder that the plug wasn't necessary...it told him it would cause a leak and he laughed at me. Trans lasted about 2 weeks and burnt the directs and intermediates.
02-07-2015 | 10:30 AM
#14
How is that going to help with flow?
Why do you think that's a restriction? Where else in the circuit might there be a restriction? What does cutting that down do to circuit volume?
I know some builders like to do that mod. I avoid it but I'm posting to stir up the technical thinking and stop the monkey see/monkey do reason for mods.
Why do you think that's a restriction? Where else in the circuit might there be a restriction? What does cutting that down do to circuit volume?
I know some builders like to do that mod. I avoid it but I'm posting to stir up the technical thinking and stop the monkey see/monkey do reason for mods.
Let me ask you, does it hurt anything? Is there any harm in doing it?
02-07-2015 | 10:59 AM
#15
If you wanted to increase the flow you can drill more and larger feed passages into the drum, through the center support, and there are places in the VB that can use some improvement.
If you are going to cut material out that increases circuit volume, it would be better to do it where it takes away rotating weight, inside the drum in this case.
Typical dual feed is restricted by feeding into one passage, as shown here by the plugged hole. A true dual feed design feeds into both sides so no plugging is necessary.
02-07-2015 | 12:13 PM
#16
You're increasing circuit volume (albeit only slightly) after the restriction. So it will take longer to apply clutches and more fluid to release. You're not increasing flow, or balancing oil there.
If you wanted to increase the flow you can drill more and larger feed passages into the drum, through the center support, and there are places in the VB that can use some improvement.
If you are going to cut material out that increases circuit volume, it would be better to do it where it takes away rotating weight, inside the drum in this case.
Typical dual feed is restricted by feeding into one passage, as shown here by the plugged hole. A true dual feed design feeds into both sides so no plugging is necessary.
If you wanted to increase the flow you can drill more and larger feed passages into the drum, through the center support, and there are places in the VB that can use some improvement.
If you are going to cut material out that increases circuit volume, it would be better to do it where it takes away rotating weight, inside the drum in this case.
Typical dual feed is restricted by feeding into one passage, as shown here by the plugged hole. A true dual feed design feeds into both sides so no plugging is necessary.
02-07-2015 | 02:27 PM
#17
When you remove the drum seal and the
When you leave the center seal out of the drum, there's plenty of flow to balance the drum, leaving the seal on or off the center support is just redundant.
You could cut material away from the drum seal area and reduce the drums weight but again increases fluid volume. No significant gain either IMO, because once you shift to 3rd, the fluid will replace much of the weight and the weight reduced is on a small diameter, so not as effective.
The following users liked this post:
Samuelrjackson (01-22-2022)
02-09-2015 | 07:09 PM
#19
I know Vince. He likely started doing the dual feed mod from conversations we had years ago. I believe they were still using the HD2 kits. It's not really a detrimental mod and one I've done myself in the past. It's just one that IMO is a waste of time. I suspect many builders do it because on the surface it seems like your gaining something and they saw it from a respected shop. I've been into FLT builds and they typically do this. IIRC, RPM does as well.
When you remove the drum seal and the
When you leave the center seal out of the drum, there's plenty of flow to balance the drum, leaving the seal on or off the center support is just redundant.
You could cut material away from the drum seal area and reduce the drums weight but again increases fluid volume. No significant gain either IMO, because once you shift to 3rd, the fluid will replace much of the weight and the weight reduced is on a small diameter, so not as effective.
When you remove the drum seal and the
When you leave the center seal out of the drum, there's plenty of flow to balance the drum, leaving the seal on or off the center support is just redundant.
You could cut material away from the drum seal area and reduce the drums weight but again increases fluid volume. No significant gain either IMO, because once you shift to 3rd, the fluid will replace much of the weight and the weight reduced is on a small diameter, so not as effective.
I appreciate you posting up things that should be changed/omited for future people that want to tackle a 4l80 build.
02-09-2015 | 07:16 PM
#20