- Aug 7, 2006
- 7
- 0
- 1
Hi. I'm new to OHV motors and this is the first time I've made an attempt to work on one so please forgive me if I sound like an idiot. Ok, I've been trying to diagnose a sound that has been coming from the topend of my motor for the past week. Here are the details,
When I start my car and let it warm up at an idle, the motor will Not make any abnormal noises. After its warm, if I take it for an easy drive, it will not show any symtoms of a problem. Once I get on the throttle, however, I begin to notice a noise that sounds like Metal to Metal contact but it is very random almost like a piece of metal is shooting around underneath a valvecover. If I bring my car to an idle again after I get on it, it keeps making the sound. The last time this happened, I got out of my car quickly, felt around my valvecover on the passenger side, and found that I could feel as if something were hitting the cover. Thinking to myself that I had found the source to my problem, I removed the valvecover and found no markings from contact with a rocker arm. Everything appeared to be in good shape (nothing broken, nothing loose). Frustrated, I removed my intake manifold to look for signs of a bad lifter. This is where I stopped. My first question is, do I have to remove each lifter to check for signs of damage? My second question is, can a lifter make this kind of noise? I'm beginning to think that I'm missing the obvious. Can someone please give me an idea of what could be making this sound? Thanx and some mods are listed below.
*1989 Mazda RX7*
late model 5.0 block
fully ported '69 351w heads
Forged silv-o-lite keith black flattop pistons
Scorpion roller rockers
crane double valve springs
crane hydraulic roller lifters
lunati hydraulic roller cam
edlebrock rpm intake manifold
Holley 650 DP
MSD 6AL ignition
MSD distributor
Tremec 600 tko tranny
King Cobra clutch
When I start my car and let it warm up at an idle, the motor will Not make any abnormal noises. After its warm, if I take it for an easy drive, it will not show any symtoms of a problem. Once I get on the throttle, however, I begin to notice a noise that sounds like Metal to Metal contact but it is very random almost like a piece of metal is shooting around underneath a valvecover. If I bring my car to an idle again after I get on it, it keeps making the sound. The last time this happened, I got out of my car quickly, felt around my valvecover on the passenger side, and found that I could feel as if something were hitting the cover. Thinking to myself that I had found the source to my problem, I removed the valvecover and found no markings from contact with a rocker arm. Everything appeared to be in good shape (nothing broken, nothing loose). Frustrated, I removed my intake manifold to look for signs of a bad lifter. This is where I stopped. My first question is, do I have to remove each lifter to check for signs of damage? My second question is, can a lifter make this kind of noise? I'm beginning to think that I'm missing the obvious. Can someone please give me an idea of what could be making this sound? Thanx and some mods are listed below.
*1989 Mazda RX7*
late model 5.0 block
fully ported '69 351w heads
Forged silv-o-lite keith black flattop pistons
Scorpion roller rockers
crane double valve springs
crane hydraulic roller lifters
lunati hydraulic roller cam
edlebrock rpm intake manifold
Holley 650 DP
MSD 6AL ignition
MSD distributor
Tremec 600 tko tranny
King Cobra clutch