Rotor damage..and other pics...toasted:( with some questions
02-12-05 | 12:35 PM
#26
Thread Starter
Haven't we ALL heard this
Joined: Mar 2001
Posts: 3,948
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From: Indiana
Originally Posted by RotaryResurrection
Those dents in the rotor appear to be from a stock 3pc seal...which you did not have. The rotor was reused from another engine that had blown apex seals, of this I'm 95% sure. Now, this is not really a great thing to do, but it isn't uncommon, and it isn't really that bad, either. Assuming all the seal grooves are still within spec (or can be filed lightly to be put into spec, in the case of the apex groove) then dents on the rotor face have absolutely no impact on the compression or other aspects of the engine. All the rotor does is house the seals, and give the combustion chamber a 4th surface. IF the rotor grooves can properly house the seals, then there is no problem. IT'd be just like having a scratched up piston...so long as the rings sit properly in it, and there are no holes all the way though, it is fine to reuse. Now, again, I'm not saying this is a great thing to go around and do when building engines...but it's not as bad as building one with shitty HOUSINGS.
If you do reuse a rotor that has dings and dents in the combustion faces...is there a chance that those nicks can get built up with carbon and then the carbon starts to burn. So, you would have a hotspot on the rotor that could lead to preigntion?
James
02-12-05 | 12:40 PM
#27
The mystery of the prize.
Joined: Aug 2002
Posts: 832
Likes: 2
From: Bay area
Originally Posted by RETed
Hmmm...I always thought it was milled tub + milled face = FD rotor.
Milled tub only = S5 turbo
All cast - no milling of tub or rotor face = S4 turbo
I dunno where the Cosmo stuff slots into all of this though.
-Ted
Milled tub only = S5 turbo
All cast - no milling of tub or rotor face = S4 turbo
I dunno where the Cosmo stuff slots into all of this though.
-Ted
I believe reted is right here, s5 = machined dish.
heres a pic of my s5 na rotor fresh from the packing:
02-12-05 | 01:11 PM
#28
Carter 2.0
Joined: Jun 2004
Posts: 6,262
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From: Irvine Ca.
^ that looks just like my S5 rotors. Those grooves make it really hard to get the carbon out/off. I finally had to take the old apex seal and scrap it down each little groove to get the carbon off......damn grooves.
02-12-05 | 01:56 PM
#30
Carter 2.0
Joined: Jun 2004
Posts: 6,262
Likes: 6
From: Irvine Ca.
couldn't get that thing to get all the way into the corners. Did that one first then the scotch bright pads then a scraper, then the apex seal. Cleaning took way too long. If I had a bigger thing of carb dip it would have been better. I tried to paint the stuff on the rotors to keep em wet but it wasn't the same as dropping the parts into it. The gallon can at Kragens has that little basket in it and it is just right for the oils rings. Anything larger won't go. That includes rotors.
02-12-05 | 02:27 PM
#31
The mystery of the prize.
Joined: Aug 2002
Posts: 832
Likes: 2
From: Bay area
Originally Posted by jhammons01
couldn't get that thing to get all the way into the corners. Did that one first then the scotch bright pads then a scraper, then the apex seal. Cleaning took way too long. If I had a bigger thing of carb dip it would have been better. I tried to paint the stuff on the rotors to keep em wet but it wasn't the same as dropping the parts into it. The gallon can at Kragens has that little basket in it and it is just right for the oils rings. Anything larger won't go. That includes rotors.
02-12-05 | 03:29 PM
#32
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Joined: Oct 2003
Posts: 11,576
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From: Morristown, TN (east of Knoxville)
Hmmm...I always thought it was milled tub + milled face = FD rotor.
Milled tub only = S5 turbo
All cast - no milling of tub or rotor face = S4 turbo
I dunno where the Cosmo stuff slots into all of this though.
Milled tub only = S5 turbo
All cast - no milling of tub or rotor face = S4 turbo
I dunno where the Cosmo stuff slots into all of this though.
Here is a pic of an s4 t2 rotor. Sorry for the size, I took high res pics for clarity. Note the random pitting in the bathtub. The s4 NA and earlier rotors look like this too.
Here is an s5 t2. Note the machined bathtub that is in an oval shape. The face on this one also happens to be machined, which is a random thing. I have about 8 of these on hand, and only one is machined face...all are machined bathtub.
Here is an s6 FD/cosmo rotor. Note the same machined bathtub, but it's pointed on the corners like a rectangle, in contrast to the FC oval one. These are interchangeable, weight and compression are identical. The FD rotor is said to have reinforced tips to prevent the groove from forming a V like the older rotors do with 3pc seals. From what I've seen, this reinforcement (whatever it was) didn't work.
Comparo of s5 and s6 rotors.
02-12-05 | 08:11 PM
#34
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Joined: Feb 2001
Posts: 26,664
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From: n
I've heard of these anomylies, but I've never seen them myself.
The examples I've seen have been consistent with what I had posted earlier.
I know RotaryResurrection has torn down more engines than I have.
-Ted
The examples I've seen have been consistent with what I had posted earlier.
I know RotaryResurrection has torn down more engines than I have.
-Ted
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