That's the wrong rotor bearing. Seems like a big miss for something that is +2.5k.
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ACE 4131 New Movement
- Thread starter kikata1997
- Start date
That's a nice achievement but I genuinely don't see the point of dropping 2,5K on this if it will go on a closed caseback 126xxx.
If I am building a franken and want the movement to be as close/reliable as possible to the gen I'd rather upgrade a clone 4131 with gen Rolex parts.
If I am building a franken and want the movement to be as close/reliable as possible to the gen I'd rather upgrade a clone 4131 with gen Rolex parts.
Agreed. A free sprung balance is a nice feature, but I'm puzzled why they would go back to a 7 bearing structure for the rotor.
SHB
Mythical Poster
Hard pass for me, at least the PP movement is a nice upgrade on a transparent caseback but on a daytona it's better to upgrade with gen parts
If you look at the hub of the automatic rotor on the ACE movement you’ll see that the rotor is only supported by seven ball bearings. On both DD and SH versions of the 4131 the rotor is supported by more than double that number of bearings. More bearings produce a more constrained plane of movement resulting in fewer rotor that knock against the caseback or bridges.
For that price i might think about it. Thanks for sharing!
Yup that’s what it looks like. Although maybe they just had a surplus /got a deal on a bunch of the 7-ball bearing blocks and decided to go with that design.
Is it feasible to just swap the DD4131 rotor over?
Do you know if the 4131 shares balance with other movements? As in, is it going to be relatively easy to purchase a gen balance at a reasonable price? And does the new DD4131 even accept gen balance?
If it's cost prohibitive to purchase and install the gen parts this may well be a good option at a $1600 price tag. Especially factoring in the % cost of the base watch that comes from just the movement. After selling the DD4131 for lets say $400, a $1200 upgrade to have an accurate movement and hopefully better finishing aint so bad.
$1300 upgrade to the gen balance complete, end of story. I did this to my DD4130, and the readings from timegrapher are +-1 sec for over a year. After all, no one can guarantee this so-called ACE BS is as good as a gen balance.
- 25/3/21
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Correct me if I'm wrong but I believe @dogwood is referring to the number of ball bearings used here below:
This is what a gen 4131 looks like
Compared to the 7 ball bearings on the ACE 4131
Gen 4130 Movement
This is what a gen 4131 looks like
Compared to the 7 ball bearings on the ACE 4131
Gen 4130 Movement
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Yup I got it, sorry I should have split my questions up a little more clearly.Correct me if I'm wrong but I believe @dogwood is referring to the number of ball bearings used here below:
This is what a gen 4131 looks like
Compared to the 7 ball bearings on the ACE 4131
Gen 4130 Movement
I don’t know for sure since I haven’t done it, nor have I seen anybody do so yet; but I think the dd4131 should be compatible with a gen 4131 balance. However, as you say, getting your hands on a gen 4131 balance could be quite hard given how new the gen movement is.
The only way I see this would be worth it would be if you have a Le Mans which has a transparent caseback. Beautiful nonetheless!
- 25/9/22
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Well, beside from the obvious rotor defect, that finishing is really quite something. For me however, I only care about one thing, and it's stability. At $1600 or the price of a gen Longines Spirit Zulu second hand, that movement better last at least 3-5 years without a hiccup lol