I spun a bearing, didn't I
09-23-09, 11:51 AM
#26
good info GoodfellaFD3S, and yeah i can see what you mean on the bearings and also the rotor/iron damage from hitting each other. since i am not a shop and just limited to what I see in our race engines, my data is pretty limited and narrow based on race conditions, your data is probably a better general representation.
Damian, good info, thanks for posting 
I will say that I have torn down quite a few engines with spun bearings and most of them did have damage to an engine rotor and the iron housings, as the rotor had come in contact with the housings at the corner seal tip. If you come away with less damage consider yourself lucky (relatively speaking)
Also, re: bearings. While it is a valid point about reusing perfect bearings, unless they have less than ~20k miles on them we always replace them at the shop.
Reason being, I have seen multiple instances of owners spinning a bearing at 100k+ miles. They had a previous rebuild at around 50-60k and the shop in question decided to reuse the bearings because they 'looked ok.'
Pressing bearings correctly (esp rotor) can be a pain, and it's my opinion that this is why it's not a very popular procedure.
But as they say, do it once and do it right. It does make for a longer breakin, but for a street car that is expected to have longevity out of the engine I think it's absolutely necessary
I will say that I have torn down quite a few engines with spun bearings and most of them did have damage to an engine rotor and the iron housings, as the rotor had come in contact with the housings at the corner seal tip. If you come away with less damage consider yourself lucky (relatively speaking)
Also, re: bearings. While it is a valid point about reusing perfect bearings, unless they have less than ~20k miles on them we always replace them at the shop.
Reason being, I have seen multiple instances of owners spinning a bearing at 100k+ miles. They had a previous rebuild at around 50-60k and the shop in question decided to reuse the bearings because they 'looked ok.'
Pressing bearings correctly (esp rotor) can be a pain, and it's my opinion that this is why it's not a very popular procedure.
But as they say, do it once and do it right. It does make for a longer breakin, but for a street car that is expected to have longevity out of the engine I think it's absolutely necessary
09-24-09, 10:10 PM
#27
How long is the break in for a Race Engine that will see only track time.
I am about to install all new bearing and just wondering what the best break in is for them.
I was thinking about buying the Race bearings from Atkins (75 dollars more????) that have a larger clearance than the stock ones, is it worth the money.
I am about to install all new bearing and just wondering what the best break in is for them.
I was thinking about buying the Race bearings from Atkins (75 dollars more????) that have a larger clearance than the stock ones, is it worth the money.
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