broken RA super seal . anyone else?
08-05-14, 05:32 AM
#1
Just like it says I recently chipped a ra super seal . they had 10k + miles on them seen detonation . this last detonation I guess finished it took out a corner seal too but no marks on housing at all? Car made 386whp that night with ignition problems after 6k rpms . full s4 motor s6 rotors and counter weights . s5 thick rear iron . master power t70 . this was the 2nd time the seals were used . I have new ra classics now . I was low on gas doing a pull and guess caught a lean spot
08-05-14, 10:09 AM
#5
F'n Newbie...
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I'm just leery of anything that looks like gouges in the irons after pulling apart a motor I paid a "professional" shop like $5,000 to build me, and found two gouges in one of the irons. Was pretty disgraceful to be honest...
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08-06-14, 02:36 AM
#8
Yea small dent on rotor . I was low on gas doing a pull and ignition problems . figured stock Fc coils could at least handle 400whp + guess not . only think I can think of is bad plug wires or I just need a ignition box for that . we just left the dyno but I think those seals just had enough from my previous motor 2 years ago that was ****
08-06-14, 04:44 PM
#12
The engine began misfiring. Main fuel filter was not fine enough and allowing too much debris to reach the injectors. The injector filter baskets were all blocked to a degree, and the front prim injector basket was blocked considerably more. What's more, the front prim injector now appears to be internally blocked or faulty, as flow rate did not come back up to an acceptable level after removing the baskets and cleaning.
Both prim injectors have now been replaced with larger items anyway (so boost can be raised).
Both prim injectors have now been replaced with larger items anyway (so boost can be raised).
08-06-14, 05:48 PM
#14
The driver kept at it for the rest of the day - with misfire. This possibly had something to do with the broken parts lol. Apparently it didn't lose power until the end of the day though. I'm guessing it broke all the corner seals, then eventually the apex seals.
08-07-14, 01:12 AM
#16
Only time I have ever chipped an RA apex seal is when a water injection kit failed on a 13B RX7 we setup.
It was making 630rwhp on 32psi.
Water stopped working and it rattled very badly.
Whole in rotor, chipped one corner of an apex seal. All slots were heavily flared/dimpled.
Very very TUFF seal.
It was making 630rwhp on 32psi.
Water stopped working and it rattled very badly.
Whole in rotor, chipped one corner of an apex seal. All slots were heavily flared/dimpled.
Very very TUFF seal.
08-07-14, 09:29 AM
#17
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Yea small dent on rotor . I was low on gas doing a pull and ignition problems . figured stock Fc coils could at least handle 400whp + guess not . only think I can think of is bad plug wires or I just need a ignition box for that . we just left the dyno but I think those seals just had enough from my previous motor 2 years ago that was ****
08-07-14, 05:44 PM
#20
Yes, I have broken RA Classics and RA Super Seals in 2mm and 3mm both- also at the 380rwhp level.
It is usually the long piece breaks the sharp edge off or a crack right in the middle of the seal(s)
It also breaks corner seals and side housings when the 3mm RA (or 3mm stock) seals go, not just broken apex seals like 2mm seals.
Pump gas is a bad gamble where I live. Most of the time I blow an engine it is right after I have gotten a fresh tank of gas.
Current engine is living on 10psi on pump to get me to the track and race gas above WG boost.
I use 3mm stock seals now as the RA seals wear out rotor housings and don't appear any stronger against detonation than stock 3mm.
It is usually the long piece breaks the sharp edge off or a crack right in the middle of the seal(s)
It also breaks corner seals and side housings when the 3mm RA (or 3mm stock) seals go, not just broken apex seals like 2mm seals.
Pump gas is a bad gamble where I live. Most of the time I blow an engine it is right after I have gotten a fresh tank of gas.
Current engine is living on 10psi on pump to get me to the track and race gas above WG boost.
I use 3mm stock seals now as the RA seals wear out rotor housings and don't appear any stronger against detonation than stock 3mm.
10-12-14, 10:43 PM
#22
Just like it says I recently chipped a ra super seal . they had 10k + miles on them seen detonation . this last detonation I guess finished it took out a corner seal too but no marks on housing at all? Car made 386whp that night with ignition problems after 6k rpms . full s4 motor s6 rotors and counter weights . s5 thick rear iron . master power t70 . this was the 2nd time the seals were used . I have new ra classics now . I was low on gas doing a pull and guess caught a lean spot
Attachment 539642
Attachment 539642
10-13-14, 12:31 PM
#23
Looking at my old seals that sat in WD40/carbon for years, I noted a common cause of breakage with the RA seals.
The RA seals have a huge amount of very fine cracks propagating from the sealing surface and crack through the seal at the weakest point (usually the shorter path of the long sections triangular tip).
I did not see evidence of this cracking on my old broken stock Mazda seals.
It would be nice if someone could dye test some used RA seals that came out of a running engine to see if the cracking occurs in normal use with RA seals or was part of the heat of detonation that ended up breaking the seals.
The RA seals have a huge amount of very fine cracks propagating from the sealing surface and crack through the seal at the weakest point (usually the shorter path of the long sections triangular tip).
I did not see evidence of this cracking on my old broken stock Mazda seals.
It would be nice if someone could dye test some used RA seals that came out of a running engine to see if the cracking occurs in normal use with RA seals or was part of the heat of detonation that ended up breaking the seals.
