View Poll Results: What blew your last engine?
Blown coolant seal and/or overheating.
29
45.31%
Leaking oil seal.
3
4.69%
Bad knocking.
4
6.25%
Poor compression or lost an apex seal to something besides knocking.
9
14.06%
Bad lubrication (drove w/ no oil in the sump, etc.)
5
7.81%
Other (please post)
14
21.88%
Voters: 64. You may not vote on this poll
Survey: What Blew Your Engine?
08-02-07, 10:37 PM
#26
1st motor- Factory boost and not enough break in time on rebuild
2nd- siezed due to bad seals
3rd- 15psi TO4B in forth gear, heavy knocking and a later found broken boost sensor
4th- Spun rotor bearing road racing in a Porsche event(most fun I have had unsuspectingly killing an engine)
5th- soon to be alive with half bridge and MegaSquirt
This list kinda makes me sick, that is a lot of money due to impatience and not doing my homework. 5th times a charm.
2nd- siezed due to bad seals
3rd- 15psi TO4B in forth gear, heavy knocking and a later found broken boost sensor
4th- Spun rotor bearing road racing in a Porsche event(most fun I have had unsuspectingly killing an engine)
5th- soon to be alive with half bridge and MegaSquirt
This list kinda makes me sick, that is a lot of money due to impatience and not doing my homework. 5th times a charm.
08-14-07, 02:47 PM
#28
Okay, since people stopped posting, here are the results:
By vote:
26 cooling system
2 oil seal
4 knocking
8 compression/apex seal
5 lubrication
14 other
Additional engines posted:
3 cooling system
6 overboost
5 knocking
3 lubrication
2 compression/apex seal
"Other"s:
removed for a turbo
don't know
frankenblock
cracked rear rotor along apex seal groove milled to 3mm
siezed due to bad seals
TOTALS
29 cooling system
2 oil seal
19 knocking/overboost/apex seal/compression
8 lubrication
I think knocking/etc. were confusing categories, so I combined them. If I were to do this again, I'd make one category for overboost, one for knocking and another for bad compression not from overboost nor knocking.
So, based on these results, I'd say the most common causes of engine failure are:
1. Cooling system. (~50%)
2. Overboost. (~25%)
3. Lubrication: no oil pressure, no oil, etc. (~14%)
4. Other knocking/compression. (~7.5%)
5. Lousy rebuild (~5%)
Those are rough numbers; ya I know it adds up to 101.5%. And it doesn't include a couple of the bad engines posted. Also bear in mind that these are overall numbers. If you own an N/A, overboost obviously doesn't apply. If you own a turbo, overboost is a larger percentage.
By vote:
26 cooling system
2 oil seal
4 knocking
8 compression/apex seal
5 lubrication
14 other
Additional engines posted:
3 cooling system
6 overboost
5 knocking
3 lubrication
2 compression/apex seal
"Other"s:
removed for a turbo
don't know
frankenblock
cracked rear rotor along apex seal groove milled to 3mm
siezed due to bad seals
TOTALS
29 cooling system
2 oil seal
19 knocking/overboost/apex seal/compression
8 lubrication
I think knocking/etc. were confusing categories, so I combined them. If I were to do this again, I'd make one category for overboost, one for knocking and another for bad compression not from overboost nor knocking.
So, based on these results, I'd say the most common causes of engine failure are:
1. Cooling system. (~50%)
2. Overboost. (~25%)
3. Lubrication: no oil pressure, no oil, etc. (~14%)
4. Other knocking/compression. (~7.5%)
5. Lousy rebuild (~5%)
Those are rough numbers; ya I know it adds up to 101.5%. And it doesn't include a couple of the bad engines posted. Also bear in mind that these are overall numbers. If you own an N/A, overboost obviously doesn't apply. If you own a turbo, overboost is a larger percentage.
Last edited by ericgrau; 08-14-07 at 02:56 PM.
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