MSP went boom...but why?

[yellerandahalf]

timing belt could have slipped, resulting in detonation...

how could this result in detonation? I can't get that figured in my head. Not denying that it couldn't, just lacking theory behind that. Let's hope and pray that it's only a head gasket, ladies and gentlemen.

cylinder 2 runs hotter then the outter cylinders

why is that? I've never heard that before.

 

[03MzdSpdSTP]

if the timing belt slips your pistons will be hitting the valves.

The inner cylinders run hotter because its sandwiched between the outter ones. turbo hondas have problems with their 3rd cylinders overheating.

 

[yellerandahalf]

The inner cylinders run hotter because its sandwiched between the outter ones. turbo hondas have problems with their 3rd cylinders overheating.

ahh, that makes sense. Duh. Thanks for clarifying.

I'll provide more info from the shop when I get it.
-Mateo

 

[low_psi]

if the timing belt slips your pistons will be hitting the valves.

I'm 99% certain the FS-DE is a non-interferance motor. If the timing belt slipped, the motor is going to missfire, which could create enough heat for pre-ignition.

 

[vindication]

damn dude that sucks.

also, yeah from what I remember our motors are non interference.

 

[ghost]

2 more down. How many MSP were there????? Mazda Bottom end FTW!!!!

 

[Kansei]

I'm 99% certain the FS-DE is a non-interferance motor. If the timing belt slipped, the motor is going to missfire, which could create enough heat for pre-ignition.

confirmed. I don't even know if my timing is correct right now, I timed the engine by looking through the spark plug holes and got cylinder 1 to look like it was at TDC. Of course I was doing it by myself so I had to just go down, turn the crank pulley, then go back up and see if it had topped out

If we had interference engines I'd be dead.

 

[orng1]

You probably bent a valve when the timing belt slipped.

 

[Kansei]

You probably bent a valve when the timing belt slipped.

*doot doot*

In the case of the 'noninterference engine', if the timing belt fails, the engine will fail to start, or if running when it fails, it will quit running. An inconvenience, but no internal damage should result.

 

[wicked]

msp doesn't have a speed limiter... It can possibly be the timing belt. boosting in 5th is fine long as your fuel map is right, you can boost from 5th all day long on a stock turbo car. Engines just don't blow for no reason, something was definitly stressed.

BTW iron blocks are strong but doens't dissapate heat well as aluminum. cylinder 2 runs hotter then the outter cylinders so that could have something do do with it. Its probably good to have a egt bung welded on cylinder 2 exhaust port on the the manifold.

a litlle corection on some bad info here.


the MSP has a speed limit it's set to 137,I have been to it many times,as well as other members here.

and it's #3 that tends to be hotter,it also has a tendacy to flow higher CFM's on the exhaust side then others,one reason why turbos are typicly placed on the #3 cylinder.







YELLER>>>>>>>>>>>>>>

check your coolling system for oil for me.(you can blow a head gasket,and still not have oil in our coolent)

you need to pull this engine apart,even if you think it's just a head gasket,you may have busted a ring,or worse,if it's from detanation you may have snapped some ring lands.


for future you should use a OEM MLS head gasket.


what pistons do you have?are you running CRMO rings?

 

[ghettobubba2001]

rule number 1 never boost excessively in 5th gear PERIOD the Ratios are wayyyyyyy to low for boost. Everyone seems to blow they're engines in this gear.

 

[orng1]

"knocking on wood"

 

[yellerandahalf]

check your coolling system for oil for me.(you can blow a head gasket,and still not have oil in our coolent)

you need to pull this engine apart,even if you think it's just a head gasket,you may have busted a ring,or worse,if it's from detanation you may have snapped some ring lands.

for future you should use a OEM MLS head gasket.


what pistons do you have?are you running CRMO rings?

Wicked, I'm pretty sure the shop will be doing that, I'm going to call them today and get the status.
I'm hoping that I'll be able to see the pistons well enough from the top to tell if the pistons have any damage.
I'll definetly be getting an OEM gasket this time, assuming I'm even putting it back together.
I was under the impression from my boss that I actually had stainless rings.
-Mateo

 

[Jeph]

Damn, I can't believe this. It sorta makes me worried about driving my car at 12 daily... But it won't be seeing as much track use, and probably no 5th gear boosting. I hope you rebuild her bigger and better than before.

 

[DiscreetSpeed]

sounds to me like major detonation and that much oil just from rings doubtful im betting the ringlands are cracked or broken. Sucks man i know.


edit: but where could the leak from the block be coming from?
headgasket? but you would see coolant as well and maybe even overheating.
valve cover? oil pressure sensor?

 

[yellerandahalf]

ok, just got word from the shop. Head gasket definetly went, but so did piston #2. It actually melted all the way down to the first ring land. Quite impressive. Trashed the cylinder walls, too. Block is toast. Head is doubtless toast as well, with that much heat going on. The exhaust cam slipped a tooth, most likely causing higher cylinder temps and detonation. Then meltification. Now the question of what to do from here...

 

[mp3moose]

rebuild? or light on fire?

 

[DiscreetSpeed]

dude i been there....so many times i wanted to stick a fork in this car but here i am yet again......get a temp set up. used engine will run you 400-600.
http://www.msprotege.com/forum/showthread.php?t=123630185&page=1&pp=15

 

[Speed_Racer]

is this the fate of every msp lover. I wonder . . .

 

[yellerandahalf]

yeah, I'm wondering myself. Still trying to figure out what caused it to blow. Found an engine from an '03 protege with 12k miles on it for 750. Any idea whether this motor is any different than the MSP motor????
-Mateo