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Rotary Tech - General Rotary Engine related tech section.. Tech section for general Rotary Engine... This includes, building 12As, 13Bs, 20Bs, Renesis, etc... |
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#1 |
Mazda Lover
Join Date: Aug 2010
Location: Akron, Ohio
Posts: 319
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Common Points of Engine Failure
I've been reading (in my never ending strive to accumulate information) of a few engine failures, and I thought (i searched) that it would be nice to have a single thread about the different types of engine failures. So far the few I have had are as follows.
1)Bearing failure for the e-shaft - usually oil related, sometimes overheating and over reving 2)Apex seal failure, chipping, scoring - detonation the cause? 3)Carbon build up causing the rotors to become un-ballanced -it happens, but can be prevented mostly, also the water cleaning can fix carbon already built up 4)Seal/compression can be lost -side seals, seal springs loose springyness, improper clearances, wear on the housings, apex seals, cold ass weather doesn't ever help, oil starvation (OMP failure or lack of proper ratio of premix) Are there any others? Anyone care to go further into what causes these failures, and what can be done to prevent these? I'm just wondering, and of course, knowing failure points helps your maitnence, and your tuning/building knowledge.
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![]() 2004 Mazda6 V6 5-spd - still waiting on money for a motor 1991 Mazda RX7 NA 5-spd - my new DD with 145,000 miles |
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#2 |
destroy, rebuild, repeat
Join Date: Feb 2008
Location: Charleston, SC
Posts: 395
Rep Power: 18 ![]() |
another problem i see a lot is coolant seal failure, but after tearing down the engine, there is nothing obviously wrong with the coolant seals. Its like they flatten out after a while or something. ive torn down about 4 engines, and have seen this on two of them. symptoms were overflowing coolant overfill and white smoke/running one rotor on startup
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1993 RX-7 Touring MB, stockport 13B-REW, 9.4CR rotors, T04S 60-1/p-trim single turbo 1986 RX-7 Base project track beast |
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#3 |
Mazda Lover
Join Date: Aug 2010
Location: Akron, Ohio
Posts: 319
Rep Power: 15 ![]() |
what would cause that, the extreme heat and torsion of the motor? Other than just age?
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![]() 2004 Mazda6 V6 5-spd - still waiting on money for a motor 1991 Mazda RX7 NA 5-spd - my new DD with 145,000 miles |
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#4 | |
Test Whore - Admin
Join Date: Mar 2008
Location: Right Behind you son
Posts: 4,581
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Quote:
I tore an engine down about a month ago.... this was the CLEANEST engine that I have ever pulled apart that wasn't mine. This thing was mint.... coolant seal let loose as described above. It's cool though, bought the 'vert for dirt cheap becuase of that coolant seal.
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-The Angry Stig- DGRR 2009, 2011, 2012 & 2013 - Best FC DEALS GAP!! WOOHOOOO!!!!! 2015 Audi S4 - Samantha - Zero Brap S4 2004 RX8 - Jocelyn - 196rwhp, 19mpg fuel to noise converter 2000 Jeep Cherokee Sport - Wifey mobile - Now with 2.5" OME lift and 30" BFG AT KO's! So it begins 1998 Jeep Cherokee - 5 spd, 4" lift, 33" BFG's - Rotary Tow Vehicle 1988 'Vert - In progress 1988 FC Coupe - Gretchen -The attention whore BEAST! I'm a sick individual, what's wrong with you? I'm pure Evil I'm still insane, in the best possible way. I think Brian's idea of romance is using lube. Your rage caused the meteor strike in Russia. The Antichrist would be proud of his minion. You win with your thread. Most everything It's a truck with a steel gate on the back. Just a statement of fact Motec M820, AIM dash, ported 13B-RE Cosmo, 6-spd trans, 4.3 Torsen, custom twin wg fully divided mani, Custom 4" split into 2x 3" exhaust, Custom HMIC, Custom custom custom custom I like to welder stuff.... No Bolt-ons allowed. Dyno'ed @ Speed1 Tuned by me - 405rwhp on WG.... WM50 cuming soon. -Angry Motherf*cker Mode ENGAGED- |
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#5 | |
Custom User Title
Join Date: Feb 2008
Location: Seattle, WA / Pullman, WA
Posts: 350
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#6 |
Mazda Lover
Join Date: Aug 2010
Location: Akron, Ohio
Posts: 319
Rep Power: 15 ![]() |
dammit, i must not have gone back far enought, thanks
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![]() 2004 Mazda6 V6 5-spd - still waiting on money for a motor 1991 Mazda RX7 NA 5-spd - my new DD with 145,000 miles |
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#7 | |
⊙⊙
Join Date: Dec 2009
Location: Great Falls
Posts: 1,258
Rep Power: 17 ![]() |
How about exhaust sleeve failure.
![]() I know Brian had this happen I don't think his engine failed due to it. It was the opposite rotor also I think.
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Quote:
Last edited by chibikougan; 02-25-2011 at 02:50 PM. |
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#8 | |
⊙⊙
Join Date: Dec 2009
Location: Great Falls
Posts: 1,258
Rep Power: 17 ![]() |
Whoa! Muscle Spasm
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#9 |
Test Whore - Admin
Join Date: Mar 2008
Location: Right Behind you son
Posts: 4,581
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Yup, been there, been fucked by that. Rear rotor, sleeve failed, engine perfectly healthy... the three turbo's that the chunks went through...... not so much
__________________
-The Angry Stig- DGRR 2009, 2011, 2012 & 2013 - Best FC DEALS GAP!! WOOHOOOO!!!!! 2015 Audi S4 - Samantha - Zero Brap S4 2004 RX8 - Jocelyn - 196rwhp, 19mpg fuel to noise converter 2000 Jeep Cherokee Sport - Wifey mobile - Now with 2.5" OME lift and 30" BFG AT KO's! So it begins 1998 Jeep Cherokee - 5 spd, 4" lift, 33" BFG's - Rotary Tow Vehicle 1988 'Vert - In progress 1988 FC Coupe - Gretchen -The attention whore BEAST! I'm a sick individual, what's wrong with you? I'm pure Evil I'm still insane, in the best possible way. I think Brian's idea of romance is using lube. Your rage caused the meteor strike in Russia. The Antichrist would be proud of his minion. You win with your thread. Most everything It's a truck with a steel gate on the back. Just a statement of fact Motec M820, AIM dash, ported 13B-RE Cosmo, 6-spd trans, 4.3 Torsen, custom twin wg fully divided mani, Custom 4" split into 2x 3" exhaust, Custom HMIC, Custom custom custom custom I like to welder stuff.... No Bolt-ons allowed. Dyno'ed @ Speed1 Tuned by me - 405rwhp on WG.... WM50 cuming soon. -Angry Motherf*cker Mode ENGAGED- |
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#10 |
Mazda Lover
Join Date: Aug 2010
Location: Akron, Ohio
Posts: 319
Rep Power: 15 ![]() |
How does that happen? Any way to prevent it?
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![]() 2004 Mazda6 V6 5-spd - still waiting on money for a motor 1991 Mazda RX7 NA 5-spd - my new DD with 145,000 miles |
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#11 | |
Test Whore - Admin
Join Date: Mar 2008
Location: Right Behind you son
Posts: 4,581
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I'm gonna go with high EGT's over a sustained period of 4k rpm cruising for 20+ hrs strait on puked turbo's thus the EMAP's where very high.
And I'll save Peter the trouble Quote:
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__________________
-The Angry Stig- DGRR 2009, 2011, 2012 & 2013 - Best FC DEALS GAP!! WOOHOOOO!!!!! 2015 Audi S4 - Samantha - Zero Brap S4 2004 RX8 - Jocelyn - 196rwhp, 19mpg fuel to noise converter 2000 Jeep Cherokee Sport - Wifey mobile - Now with 2.5" OME lift and 30" BFG AT KO's! So it begins 1998 Jeep Cherokee - 5 spd, 4" lift, 33" BFG's - Rotary Tow Vehicle 1988 'Vert - In progress 1988 FC Coupe - Gretchen -The attention whore BEAST! I'm a sick individual, what's wrong with you? I'm pure Evil I'm still insane, in the best possible way. I think Brian's idea of romance is using lube. Your rage caused the meteor strike in Russia. The Antichrist would be proud of his minion. You win with your thread. Most everything It's a truck with a steel gate on the back. Just a statement of fact Motec M820, AIM dash, ported 13B-RE Cosmo, 6-spd trans, 4.3 Torsen, custom twin wg fully divided mani, Custom 4" split into 2x 3" exhaust, Custom HMIC, Custom custom custom custom I like to welder stuff.... No Bolt-ons allowed. Dyno'ed @ Speed1 Tuned by me - 405rwhp on WG.... WM50 cuming soon. -Angry Motherf*cker Mode ENGAGED- |
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#12 |
Mazda Lover
Join Date: Aug 2010
Location: Akron, Ohio
Posts: 319
Rep Power: 15 ![]() |
so NA this shouldn't be an issue at all?
__________________
![]() 2004 Mazda6 V6 5-spd - still waiting on money for a motor 1991 Mazda RX7 NA 5-spd - my new DD with 145,000 miles |
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