gtp s/c rotor swap HELP

**GR8racingfool** · 06-03-2008

Until now.

~F~

**Reptile** · 06-03-2008

Just for reference....this is what a knocking rod sounds like.
YouTube - 97 KenneBell Cobra - 4 valve suffering rod knock..

There's a trick that comes in extremely handy for finding engine noise.
Get you a dowel rod from wal mart, or a hobby store....sand one end so that it has a bullet shaped tip, and use that to find your noise. You can put it to the side of your head over your ear, not IN your ear, and then cup your hand over that. If the rotors are knocking, you will hear it...if it's somewhere else on the engine, you could find it that way.

I'm not sure if you had taken the main belt off as well...but if you are sure it's coming from the driver's side then it may not be the pulley system. It could be a cracked flexplate.

Cracked Flexplate Video

If this is the case....you're gonna need minor surgery. The engine...or the transmission will have to come out to replace this.

**Cyko** · 06-04-2008

Originally Posted by GR8racingfool

Until now.

~F~

GR8, still makes the noise without the snout having a belt on it...

Rep, it DOES sound more like the first video, but no where NEAR as bad... the second is just completely different, I can barely hear it from inside the car, unless I'm at a high RPM. I'm currently on vacation on the gulf coast of Florida, but when I get home I'll make a quick video and let you guys hear the issue. I can't figure it out, and now it's just about getting it to a good shop to have someone charge me out the @ss to tell me something small is wrong and they replaced it, as well as 4 other "notquitebrokenbutwillbeinthenext100thousandmi les" parts that I didn't need. We'll see what happens.

**IndeedSS** · 06-05-2008

Mine sounded like that first video when I spun a rod bearing. It started out as barely noticable and only at higher RPMs. Over the next few days it got louder even at idle.

**Cyko** · 06-05-2008

Alright SS... IF that were the case and I spun a bearing.... am I still in the same boat financially? Cheaper to get a whole new engine, rather than tear the heads off and pull the block apart to get to/replace that one bearing?

TDCRacing · 06-05-2008

if you get a new engine it will probably cost more than a rebuild...if you get a used engibe you never know what it has been through or how long it will last.

a rebuild imho is the best solution if this were the problem....rod bearings,crank bearings,rings,line honing,cyl bore honing and labor at a decent machine shop shouldnt cost more than a used engine with 70000 miles....you do the math lol

**Sabrewings** · 06-06-2008

You can pick up a used L67 for as little as $500-700 depending on the yards near you. Ed Morad sells them too. A engine rebuild would be more than that, from what I've seen.