427 down on power

[Paul Gillespie]

Got to ask why that #3 plug looks so poor. I put a new motor on my Cobra this summer brand new plug wire was bad. I had pulled my plugs and had one that looked brand new. when I restarted I put the timing light on on the wire in question and found that is was not flashing steady light but was flashing some. I replace the wire and got a contast steady flash on the timing light issue was resolved. My cobra is running a 331 fuel injection with a 10PSI blower so in my case the plug was getting washed off injector under boost and the fuel was igniting in the pipe. With what you see in that picture #3 is not firing correctly so I would start looking a the cap, the wire, and the plug.

[FatBoy]

I've checked the compression on all cylinders and they are all between 140-150 psi. However, interestingly #1 - #4 are all lower than #5 - #8.
I've also checked the fuel level in teh carb and both float levels were low requiring a couple of full turns on the adjustment nut to get the fuel to the check window.
Would that be enough to cause my low power symptoms?
If that doesn't fix it, I've borrowed a new carb to try that.

Paul

[patrickt]

Originally Posted by FatBoy

Would that be enough to cause my low power symptoms?

The only way to tell is to take it for a ride. Did you chat with the SA folks? Did they break the engine in on a dyno or did you fire it up for the very first time?

[FatBoy]

Originally Posted by patrickt

The only way to tell is to take it for a ride. Did you chat with the SA folks? Did they break the engine in on a dyno or did you fire it up for the very first time?

I did speak to SA and they ran the engine up to break in the cam, but only on a stand, not a dyno so it wasn't under load and therefore wouldn't open the secondaries. They did say that they would fix any problems if I found any. They've been really good on that front, I had a problem with the gear lever being in the wrong position and they couldn't have been more helpful.

Paul