My car has 1200 CC secondary's professionaly installed. I have heard that 1300 CC have caused engines to blow. My duty cycle hit 80 pct on my power FC when it blew up on the dyno. The things that were found when the engine was torn down, is that the front rotor cracked 2 apex seals, the intake port on that rotor side was missing the gasket, also the spark plugs on that rotor were severely worn compared to the other 2 plugs. Also the oil pump was worn pretty bad, the oil sending spring was out of spec and the engine bearing was worn.

With that said, how do I know if my injectors were to blame? Im reading threads and a bit concerned. Thanks.

 

The engine may have failed for a variety of reasons. When it detonated it cracked the seals. (The rotor didn't crack the seals, lack of fuel probably caused it, DETONATION).
1) You said you were missing an IM gasket?..Hmmmm.

2) Spark plugs ...Someone probably was lazy and only did 2 of the 4, hard to tell.

3) Oil sending spring "out of spec"? sounds like someone is blowing smoke up your ***.

4) Engine bearings always wear...normal.

High milage motors tend to break easier under dyno stress. The apex seals get brittle after about 50,000/60,000 miles. Tuning these cars well is difficult and one car will differ from another. Send all 4 of your injectors to RC engineering and they will flow test them for $25.00 each.

 

There is a spring that has to do with oil pressure that is normally 73 MM, that was 70 mm in this case. I dont know the technical term, sorry.

all 4 of my spark plugs were changed, I take my car to the same rotary mechanic and its very well maintained. There is a gasket that covers the air intak port and some of the other ports. the part that covers the air intake port was completely torn off.

I understand that RC can flow test them, but this is my only car and cant be without right now. I guess my question is more or less if anyone has heard of 1200 CC injectors causing these problems. I cant see how I ran out of fuel being only at 80 pct on the dyno.

 

[QUOTE]Originally posted by ZeroBanger
[B]There is a spring that has to do with oil pressure that is normally 73 MM, that was 70 mm in this case. I dont know the technical term, sorry.

**I know exactly what it is...it's silly.

all 4 of my spark plugs were changed, I take my car to the same rotary mechanic and its very well maintained.

**Which two plugs? It also was probably nothing.

There is a gasket that covers the air intak port and some of the other ports. the part that covers the air intake port was completely torn off.

**LIM and UIM intake gaskets are steel. Old ones were paper.

I understand that RC can flow test them, but this is my only car and cant be without right now.

**Fed X. They will do them in one day. If you beleive they are bad why would you put them back in your car so you could blow the motor again? send them off.


I guess my question is more or less if anyone has heard of 1200 CC injectors causing these problems. I cant see how I ran out of fuel being only at 80 pct on the dyno.

**I have heard of 1300 cc sticking and so 1200's probably can as well. The flow rate (80%) has nothing to do with them malfunctioning. Send them, off but I doubt that was your problem. Better safe than sorry.

 

[QUOTE]Originally posted by Mr rx-7 tt
[B]thanks for your input. Yes, when he showed me the gasket it was paper, the new one he showed me was metal or something. I didn't really think about when he was putting my car together. I got my car back on Friday. Last night I found threads about 1300 CC injectors causing engines to blow up so I guess I got a little concerned.

The two plugs that were worn out were the two plugs on the front rotor. the same rotor that had bad seals and had the gasket torn off the Intake port.

Thanks.

 

the dyno didn't have an a/f on that dyno. I had my car dynoed before and it was 10:5 to 11:1 at peak power. I thought it would only run lean if the injector duty cycle was very high, otherwise there should be enough fuel?