Friends engine blew...
 

Hey guys my friend just bought a 95 touring edition at a used car dealership. It had 28k miles on it and the boost was at 12 10 12. Seems like the same ratio as the 10 8 10 for stock boost. He said on the way home he boosted from 45miles to 120 miles and his engine just blew. He told me it still cranks though.. Is there still hope for his engine? What could have happened? With only 28k miles on the engine how could it so easily blow.. Mine has 120k and i could boost it to 120miles.

Depends on a lot more than just the boost.
Bad fuel, bad injectors, wrong plugs...

Carbon build up from being barely driven? ~2000 miles a year, a lot of time sitting in a garage.

I'm sorry for your friend but he probably should have exercised a bit more restraint until he had the car sorted out and examined by a professional. If the engine is truly blown, it is done.

If he was someone who could properly afford the car he needs to choose one of the reputable rotary shops near you or via the forum and get the engine rebuilt, learn what caused the engine loss and avoid the same mistake. If he can't afford the car...well time to save up or part it out.

Sorry to come across as hard but it is the truth. What makes you certain the engine is blown?

I'm not sure if it really is blown. That's what he told me. Wouldn't boosting in 5th gear starting at 45mph put a lot of stress on the engine? Shouldn't you be at like 3rd or 4th gear for that low of a speed? The dealer told him the car runs rich. Does that have to do with anything?

Before anything check the hose to the MAP Sensor, it may have just popped off, this will cause the engine to idle rough...

If that is not the case then try getting a compression check...

he could of fouled the plugs if it was running rich

From a 45mph roll, you should be in either 2nd or 3rd if you want to punch it, doing it in 5th will put a lot of load on the engine.

Either way, he can probably do a compression check to see what's up.

Putting a lot of load on an engine in that manner isn't going to cause it to blow so that has nothing to do with it. I do shit like that all the time to test at what RPM it makes X PSi etc. and other random tests or when tuning. If it is blown the issue is elsewhere.

It could be a variety of things that are making it seem like it was blown so he should take it to a rotary professional. If he just bought it from a dealer, and on the way home something went wrong, wouldn't the natural reaction be to take it back to the dealer you bought it from same day and say WTF? It's not like you touched it.

thewird

Blowing a rotary engine usually has nothing to do with the mileage on the engine and everything to do with the engines peripherals. e.g. fuel, ignition, cooling..

The engine dosent just explode because it feels like it. It fails due to a problem with the many engine peripherals. e.g. an injector fails causing a lean condition & detonation. Fuel pump dies suddenly during boost etc etc.

Chances are, if your friend put a brand new engine in his car today (without figuring our WHY the engine failed last time) and went and did the same thing as previously (his acceleration run)- the engine would proberbly die just as quickly because no doubt its one of the many things that supports the engine which caused it to die.

Oh okay. Thanks guys. I learned a lot from this. My friend lied though... He came over earlier just to show off his car. Man I felt hella bad for him and made this thread to try to help but he lied...
Sorry for wasting your time guyes. I learned a lot though.

When your friend isn't looking you should disconnect the hose that goes to the map sensor. As it mimicks a blown engine... That will teach him.

THIS!

The map-sensor sits up on the torpedowall, by the elbow(the pipe with the 90 degree bend on it that bolts to the throttlebody and intake manifold. Unplug the small pipe and have a laugh ;)

http://www.garage411.com/images/Mazd...ting/Fig.9.gif

+1, have him crap his pants X2. karma is a bitch. ;)

LOLOLOL HAHAHA. I'm down. It just mimicks the affect both won't actually harm harm his engine right?

he won't be able to actually move the car, it'll piss fuel so i wouldn't let it slide for too long but for a few minutes no, it won't hurt anything.

^ I've driven home which was 1.5 hours away once with a map sensor unplugged from the track carrying my trailer, tires, fuel tank, and tools and such. It won't harm anything but dont let him leave without fixing it for him lol.

thewird

Actually don't unplug it all the way. Just barely have it plugged. So when he starts it will be fine till he goes into boost and he will really crap his pants. I know I did when that happened to me.

Do this and report back to us so we can all have a good laugh

This is the thing to do...

Not such a good idea... if he's boosting when it pops off, fuel is reduced and he could run lean and actually damage the engine

Then the thread can get back on topic!:nod:

Not impossible, but unlikely. When it pops off the ecu DUMPS fuel into the engine. This happened to me while tuning my new engine and @ 1BAR of boost, zero issues.

It is pretty scary though, and probably downright terrifying for a new owner. I say go for it and teach him a lesson.

Gordon, if you read post #11, his friend was messing with him, the engine did not blow, so in turn we told him to loosen the line to the map sensor so when he boost it will pop off and mimmick a blown motor just to get back at him...

now i understand why its called the ''darkside''

you guys are funny