Would a vacuum leak cause KR? I don't know thats why I'm asking. Have you tried the 104 octaine yet?

 

I get the same valvetrain noise. An intermittant tick/tap. Sometimes I get nothing but the sewing machine noise, others I get the tap mixed in.

I only heard this after installing the cam and pushrods. Never got it with the 918's on the stock cam.

 

If you have time, recheck your rocker arm torque specs -22lb/ft for the non sewing machine "ticking". Rotate the motor a couple of times and check torque them again to 22lb/ft.

OBX-If you run racegas and the KR goes away or just down a considerable amount (like 6*) then you would have real knock. If you have edit you can limit the amount of maximum retard it will give when it registers knock. Lower the values in 'Max KR vs. Load' and 'Max KR vs. RPM' tables.

Like BigKID is noticing, make sure your fueling is accurate first though. o2 sensors aren't all that accurate. They will get you pretty close to ballpark though. Seeing that you are running a .94 you should be rich enough to lower those KR values. Always be aware of audible detonation however. If you can hear it, it has been doing it before it got to your ears.

 

Yeah, I rechecked torque specs a few days after the cam went in. Everything is cool on my end.

 

I hope you get it straight I want to see you run some 11's.

 

Kenny, When ever you want to swap computers i am willing! lol. probably won't solve your problems but hey, i could have edit for a day!

 

I wouldn't think so unless it was a big leak an was pulling in a lot of unmetered air causing the motor to run lean. I did not try the 104 Oct trick but I did drasticly reduce my timing table (8*) and had the same KR results.

Marc... How does your intermittent 'tick' sound?

Ryan... I think I may pull the valve covers off this weekend and retorque the rocker arms again but I went over them twice while installing them.

John... I am going to leave that as a last resort but I will let you know if I want to try it.

I am acutally running a little lean according to the data I gathered since I put in the new O2s. (Slightly positive l-trims in some cells and .875-.880 O2 voltages under wot) So I think I may need to throw some more fuel at it. I am going to try to get a friend's innovative wide band this weekend to see exactly what my afr is. Maybe that will give me some better insite as to what is really going on.
I am also really looking into the VE threads in the PCM section. I believe this is something I need to try and figure out since the new flow characteristics of the heads and cam along with the increased compression probablly really changed the way the 5.3 handles air now.

 

it may sound like a long shot but when you have heads milled it changes how the intake lines up with heads, you may have some leakage around intake to head seal. just a thought.

 

I dont have any of the classic symptoms of a vacume leak though.. hunting for idle, surging, etc..

 

My tick... it's a rather random noise. Sometimes it'll start ticking after a good romp. Somtimes I'll just notice it pulling into my driveway when I idle down real low and drive next to our stone-wall.

It's a metallic valvetrain noise at half crank speed. I can't really pinpoint which side of the motor it's coming from. It sounds like someone taking a good sized screwdriver and tapping the valvecover(s) with the metal end of it.

I think it's a "single" noise source. It doesn't sound like more than one lifter, pushrod, cam-lobe, rocker, or valve. Just one noisy component.

I hate to say it, but I'm 90% sure I'll be pulling the TR220 out this weekend. I'm uhappy with around town throttle responce, and torque on the highway. I've got to tow our camper on vacation next week, and the stock cam is better for that. I was hoping to be "borderline" with the 220, but I don't think it's working out due to my lack of mods.

I'll be able to tell if the KR and valvetrain noise were associated.