Who blew an engine before?

[Jetblack]

Just curious to who's ever blown an engine before and what kind of tuning was done to do it (ie. a/f ratios, was the car knocking audibly, etc.) I'm just trying to get tuning notes in my brain to not do the same thing

 

[1LE]

Thankfully I haven't blown an engine yet. I know 4 people that have blown up 4g63s. 2 of them were sudden losses of oil pressure. 1 was a fuel injector failure. Those were all turbos. The last person blew up 2 stock non-turbos... Can't think of anyone that's managed to tune one poorly enough to cause it to blow up. They're really an incredibly tolerant engine.

 

[sleepyvr4]

I've seen 25psi on NA motor crush ring lands, no knock sensor or wastegate actuator connected. Also 15psi on roughly 87 octane in the heart of winter caused 4 burnt valves on my friend's TSI. Other than that overboosting blowing head gaskets. All of these were not my cars. All had 14b's with little to no mods.

 

[kpt4321]

I've seen 25psi on NA motor crush ring lands, no knock sensor or wastegate actuator connected. Also 15psi on roughly 87 octane in the heart of winter caused 4 burnt valves on my friend's TSI.

Either your friends knew that this has a strong possibility of blowing up their cars and didn't care, or they are complete morons.

 

[ahains]

I've seen 25psi on NA motor crush ring lands, no knock sensor or wastegate actuator connected. Also 15psi on roughly 87 octane in the heart of winter caused 4 burnt valves on my friend's TSI. Other than that overboosting blowing head gaskets. All of these were not my cars. All had 14b's with little to no mods.

Help me understand this - would the valves be burned because the low octane was causing tons of knock, which pulled timing like mad, which gave repeated late ignitions that were shooting fire past the exhaust valves?

I was contemplating doing some testing with a logger for 87 octane at stock boost, with water injection on continuously at a very very small flow (~0.75 GPH), with much more significant flow kicking in at very low boost (maybe 3-4psi).

I want to make sure the only dangers associated with 87 octane are in fact its lack of detonation resistance.

Thanks!
Adrian

 

[kyle h.]

i've blown 3 sohc honda engines. loud knocking noises (rod knock), sudden loss in power, LOTS of black/blue/grey smoke coming from the exhaust, low oil pressure, and the list goes on. live and learn my friend, you need to blow a few first.


the dsm engine just wont blow up...

 

[SpoolnTsi]

i've blown 3 sohc honda engines. loud knocking noises (rod knock), sudden loss in power, LOTS of black/blue/grey smoke coming from the exhaust, low oil pressure, and the list goes on. live and learn my friend, you need to blow a few first.


the dsm engine just wont blow up...

you better knock on wood now that you said that. I swear, you piss a dsm off they always find a way to make you pay for it

 

[ahains]

Bump - can anyone please confirm or deny my octane question above?
I would greatly appreciate it.

Another thought - could the burned valve be simply because 87 octane gives off more BTUs than higher octane fuel?

This is an interesting site:
http://www.klotzlube.com/support/tech_information/octane.html
They describe the process used to measure the octane of a given batch of gasoline.

Thanks,
Adrian

 

[kpt4321]

It was probably the low octane causing excessive knock, and therefore timing retard.

I don't know why you would try to run 15 psi on 87 octane with a stock ECU. Stupid, stupid, stupid.

 

[sleepyvr4]

I hear you on the stupid comments. We were not sure what gas was in his talon. The guy who had it before him was a moron as well, as he told my friend who bought it it needed rings. It smoked terribly. I had a big 16g. Rather than loosen one bolt and check for shaft play, my friend bought the car, got it home and the turbo was absolutely trashed. Motor had 155 compression on all 4 cyl. The car also sat for 2 years. He got a new turbo, threw it all together and took it out in 0 degree weather w/ a boost controller that wasn't set. Hit 15psi and burnt 4 valves. It ran fine prior to all this, as it just smoked and was boostless. I would place blame on the gas (if it was still gas)

 

[sleepyvr4]

oh yeah, he avoided my suggestion to get gas (93) and his car was so far on empty I'm surprised it started.

 

[sleepyvr4]

The car had a b16g when he bought it...