Long story short, my car was running great until I installed a silencer on my super loud Tomei exhaust. I had to drive from FL to VIR so I installed the silencer for the first time. Car ran fine, but it would not let me go into VTEC. It would just burble at 6k RPM and not engage. Took off the silencer and VTEC was back.

I didn't think much of it then the motor gave that weekend. Two rods thrown, but when I took the valve cover off, a VTEC roller on the intake side was sheared.

So now with my new motor, I'm having trouble breaking in my clutch because the car is so unbearable on the street. Is it safe to run a silencer or will I just cause the same thing again? Not sure if it was the cause of the motor giving out or just bad timing.

Thanks for any insight.

 

There is going be to some crazy high back pressure if you can't even get it into VTEC.
I guess it's the new style pee shooter hole that you got? So much for that high performance.


Maybe if you drive it super careful and not rev over 3-4krpm it might be ok but I wouldn't use that crap otherwise.

 

I only used it to drive to the track. I don't even care that it didn't go into VTEC as I never hit VTEC on the street. I had just installed the Karcepts tune and had never felt the 4k VTEC, which is what triggered my curiousity. On track the silencer comes off.

It is pretty damn small though. Like a one inch diameter exit with the silencer.

So far I have only done like 30 miles on the new clutch because it's such a chore.

 

Don't run a silencer for engine safety sake.

What clutch r you running?

 

I'm trying to understand how backpressure could cause oil starvation. Because if the car won't go into vtec it's usually a problem with oil pressure, which makes sense because OP says the pin on the rocker sheared off. However oil pressure is controlled by the pump, and not crank case pressure.

 

Not planning on running the silencer. I'm on the ACT pressure plate with OEM disk.

It wasn't the VTEC pin that sheared, but the bushing on the VTEC rocker.

 

VTEC does probably engage but the engine is getting so flooded with fuel it probably feels like it hits a wall.