Help me understand externally balanced 1pc RMS
12-12-2014, 04:34 PM
#1
Help me understand externally balanced 1pc RMS
Guys, I am a bit confused on the flywheel issue for 1 piece RMS engines. If the engine is "internally balanced front, and externally balanced rear, 1pc RMS," does this mean I need to get a flywheel specially balanced to the engine at a machine shop? Or can I purchase any flywheel that fits the bolt pattern?
Thanks
Thanks
12-12-2014, 06:29 PM
#2
Melting Slicks
Is your engine internally or externally balanced?
If internal, you need a flywheel without weights. (just remove them)
If you are internally balanced, you need a flywheel with the weights..and a matching harmonic balancer.
You can't run internal front and external rear parts..
If internal, you need a flywheel without weights. (just remove them)
If you are internally balanced, you need a flywheel with the weights..and a matching harmonic balancer.
You can't run internal front and external rear parts..
12-12-2014, 06:43 PM
#3
Race Director
The 1 pc rear main do use a neutral balance front damper and weighted flywheel, Internal/External balanced. If you go to summit and look for flywheels they have a choice of Internal/external.
12-12-2014, 06:46 PM
#4
Melting Slicks
12-12-2014, 06:49 PM
#5
Melting Slicks
The flywheel that fits the small bolt pattern of the 1 PC rms is the right one. I believe it has a counterwieght on it. The 2 PC rms flywheel wont fit, it does not have a counterwieght
12-14-2014, 07:04 AM
#7
Melting Slicks
No further balancing is needed.
12-14-2014, 08:42 AM
#9
Drifting
All flexplates for external balanced, 1-pc RMS should be externally balanced the same.
They had to go with ext balance due to the shape of the crank flange. All the old flanges had various shapes that didn't seem to make sense, but they were shaped that way for balancing purposes. With the perfectly round flange on 1-pc RMS cranks, there is no extra or missing weight in any area, so GM added weight to the flexplate.
They had to go with ext balance due to the shape of the crank flange. All the old flanges had various shapes that didn't seem to make sense, but they were shaped that way for balancing purposes. With the perfectly round flange on 1-pc RMS cranks, there is no extra or missing weight in any area, so GM added weight to the flexplate.
12-14-2014, 08:50 AM
#10
Le Mans Master
All flexplates for external balanced, 1-pc RMS should be externally balanced the same.
They had to go with ext balance due to the shape of the crank flange. All the old flanges had various shapes that didn't seem to make sense, but they were shaped that way for balancing purposes. With the perfectly round flange on 1-pc RMS cranks, there is no extra or missing weight in any area, so GM added weight to the flexplate.
They had to go with ext balance due to the shape of the crank flange. All the old flanges had various shapes that didn't seem to make sense, but they were shaped that way for balancing purposes. With the perfectly round flange on 1-pc RMS cranks, there is no extra or missing weight in any area, so GM added weight to the flexplate.
I just went through this confusing issue myself. This is exactly the way my machinist explained it to me. Balancer for an internal balance engine and flexplate for externally balanced one piece rear seal application.
12-14-2014, 11:03 AM
#11
Drifting
You can use an internally balanced flywheel if you like. A plate can be added under the flywheel to balance the engine. Higher end flywheels come with the plate included so you can use for either application. I'm doing one now as a matter of fact. Front is internal or neutral and the flywheel is externel. I used the plate to balance the engine. Personally I balance all of them out of the block to be sure.