4LikesTeam Associated B4.2 Thread
04-11-2013 | 12:11 PM
#4051
Joined: May 2010
Posts: 3,846
Well, that was always my understanding - that comparing piston hole size, you start by measuring the total overall hole sizes added together. Yes, number of holes has something to do with the whole equation relative to pack, but the math still has to work. I'd have to look it up somewhere, but that's what I always thought.
2 hole 1.6 = 4.019mm˛
3 hole 1.3 = 3.979mm˛
Between these two, the same static (bench) damping is easily achieved, most likely with the same oils as the difference between them is negligible at best. But the 3 hole pistons will have more pack in an equal comparison compared to the 2 hole pistons. This is because there is an additional hole with additional edges to shear against the oil as it passes through.
The machined 4 hole AE pistons have a tighter tolerance, leading to less oil "blowing by" the sides of the pistons, hence more holes AND larger holes.
04-11-2013 | 12:15 PM
#4052
Suspended
Joined: Feb 2013
Posts: 534
You need to figure the area of the hole for an accurate measurement, not as simple as just adding the sizes together. For example:
2 hole 1.6 = 4.019mm˛
3 hole 1.3 = 3.979mm˛
Between these two, the same static (bench) damping is easily achieved, most likely with the same oils as the difference between them is negligible at best. But the 3 hole pistons will have more pack in an equal comparison compared to the 2 hole pistons. This is because there is an additional hole with additional edges to shear against the oil as it passes through.
The machined 4 hole AE pistons have a tighter tolerance, leading to less oil "blowing by" the sides of the pistons, hence more holes AND larger holes.
2 hole 1.6 = 4.019mm˛
3 hole 1.3 = 3.979mm˛
Between these two, the same static (bench) damping is easily achieved, most likely with the same oils as the difference between them is negligible at best. But the 3 hole pistons will have more pack in an equal comparison compared to the 2 hole pistons. This is because there is an additional hole with additional edges to shear against the oil as it passes through.
The machined 4 hole AE pistons have a tighter tolerance, leading to less oil "blowing by" the sides of the pistons, hence more holes AND larger holes.
04-11-2013 | 12:17 PM
#4053
Suspended
Joined: Feb 2013
Posts: 534
yeah, that is what I did with my shorties. I lightened the car then I added weight in different places. But it still felt best with a full pack. To me anyway. On my other car I like shorties because it can suck trying to remove a full pack, lol. Still adding weight to that car.
04-11-2013 | 12:18 PM
#4054
yeah, that is pretty much what I read about the CVD's and the bind. Some people still use them for tuning. Does the CVS's with the set screw bind in the same way as the CVD's? I would assume different, but unsure if less or more binding. I can visually see how a free floating pin would bind less when it is not held in place with a set screw. With out feeling them in my hands or running on the track, that would make sense. But as always, it depends on how the change feels to the driver. most people come here to ask how well something works because they dont want to spend the money unless the reviews are good. Others buy everything and try it out and report back. Last, some just do what ever their friends do and believe it. Most people are of the first type. the first group rely on the second group to help decide what to buy. The last group are living in their own world. I am in the second group, lol.
To further this discussion. What about Dogbone pin wear? I have notices that some of my pins are getting flat spots on the forward driving face. I know some people rotate the bone (left to right) to get a more even wear. This flat spot seems like it would cause more friction on the plunge and also add in more bind under power. So how does all that play into when to replace the bones.
To further this discussion. What about Dogbone pin wear? I have notices that some of my pins are getting flat spots on the forward driving face. I know some people rotate the bone (left to right) to get a more even wear. This flat spot seems like it would cause more friction on the plunge and also add in more bind under power. So how does all that play into when to replace the bones.
. Where did you get the 100g brass battery weight? make it?
04-11-2013 | 12:24 PM
#4057
Suspended
Joined: Feb 2013
Posts: 534
04-11-2013 | 12:28 PM
#4059
04-11-2013 | 12:37 PM
#4060
Suspended
Joined: Feb 2013
Posts: 534
04-11-2013 | 02:44 PM
#4063
Tech Apprentice
iTrader: (1)
Joined: Jan 2013
Posts: 74
I have been trying to figure out why my car is louder than most at my track. I've been trying different gears and tightening / loosening gears and lubing things, with no success. It turns out I had a bent motor plate that made the pinion and spur be out of alignment. Looks like a heavy hit to the motor bent the plate. I suppose I should stop crashing and that wouldn't happen again. Now it's one of the quieter cars -- tip to other bad drivers withy noisy cars, like me.
