Got a new problem,possbile rod knock... - Page 2

Supra2NR · 09-06-2007, 01:17 AM

Quote:

Originally Posted by supramacist

Do you mean a valve??

it could be a lifter,
does it sound like a loud clock ticking sound

or a have you heard a horse with the shoe tapping in the pavement, only in a really really high rate of speed thats what my rod knock sounded like b4

Supra2NR · 09-06-2007, 01:19 AM

what does it sound like

does it sound like a loud clock ticking sound?
thats what it sounded like when my friend had problems with his lifters

now, my rod knock on my NA sounded like a horse with horseshoe tapping the pavement or cement,
only in a really really really high rate of speed

abhattan · 09-06-2007, 02:28 AM

If the sound is low pitched and slow, it is a rod knock. It will go away as the rpm's increase. If it is higher pitched (not too high) sound, then it is valve noise. The rod noise will also be a little slower than a valve noise because the bottom end of the motor moves slower than the top end. If it is in between and sounds more like a rattle, then it probably is the wrist pin. This also goes away to a degree with incresed RPM's. However, you will hear it most upon acceleration and deceleration. I believe it is either a rod knock or a wrist pin knock. These are the things that could go wrong in your cenario.

jon_570 · 09-07-2007, 06:43 AM

^^actually the top end moves half the speed of the bottom end.

abhattan · 09-07-2007, 09:13 PM

No, the top half rotates twice the speed. for every complete rotation the crank makes, the cam does that twice.

supramacist · 09-08-2007, 05:26 AM

Think about it like this.

The crank is large in diameter and the cams are smaller in diameter and the crank spins it all so wich is moving faster or with more revolutions per minute?

The top half.

09-06-2007, 01:19 AM	#12
Supra2NR 1000whp postwhore Join Date: Apr 2006 Location: Chi-Town Posts: 1,643	what does it sound like does it sound like a loud clock ticking sound? thats what it sounded like when my friend had problems with his lifters now, my rod knock on my NA sounded like a horse with horseshoe tapping the pavement or cement, only in a really really really high rate of speed __________________ http://www.myspace.com/supra_2nr Into Bikes now,, apparently the supra couldnt kill me, so my zx6 might lol

09-06-2007, 02:28 AM	#13
abhattan 3" Exhaust Join Date: Oct 2006 Location: Brentwood, New York Posts: 162	If the sound is low pitched and slow, it is a rod knock. It will go away as the rpm's increase. If it is higher pitched (not too high) sound, then it is valve noise. The rod noise will also be a little slower than a valve noise because the bottom end of the motor moves slower than the top end. If it is in between and sounds more like a rattle, then it probably is the wrist pin. This also goes away to a degree with incresed RPM's. However, you will hear it most upon acceleration and deceleration. I believe it is either a rod knock or a wrist pin knock. These are the things that could go wrong in your cenario. __________________ '91 Turbo Targa 5 Spd. '87 Corolla GT-S 5 Spd '91 Accord Daily Driver 5 Spd Soon to be rebuilt (All to some extent)

09-07-2007, 09:13 PM	#15
abhattan 3" Exhaust Join Date: Oct 2006 Location: Brentwood, New York Posts: 162	No, the top half rotates twice the speed. for every complete rotation the crank makes, the cam does that twice. __________________ '91 Turbo Targa 5 Spd. '87 Corolla GT-S 5 Spd '91 Accord Daily Driver 5 Spd Soon to be rebuilt (All to some extent)

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09-07-2007, 06:43 AM	#14
jon_570 Stock Join Date: Jul 2007 Location: maryland Posts: 5	^^actually the top end moves half the speed of the bottom end.

09-08-2007, 05:26 AM	#16
supramacist 1000whp postwhore Join Date: Apr 2007 Location: Escape from the Prison Planet Posts: 1,356	Think about it like this. The crank is large in diameter and the cams are smaller in diameter and the crank spins it all so wich is moving faster or with more revolutions per minute? The top half.