Spark Plug knock?

Big Azz Rice Burner · 05-12-2006, 12:38 PM

Has anyone had a spark plug knock? I can hear it when I am next to a jersey
wall. I had the dealership look at it, they said "NO PROBLEM FOUND" I do not know what to do? I tried changing octane from 87 to 93. Any help would be
great.

sudden urge · 05-12-2006, 01:17 PM

The motor has anit-knock sensors, so yours would be the first oner I know of here to actaully hear a ping.

RB's Titan · 05-12-2006, 01:53 PM

I have heard some noisy lifters that could sound like knock. When do you hear the noise?

scr38 · 05-12-2006, 02:24 PM

Randy, there won't be any lifter noise with our DOHC engine.

RB's Titan · 05-12-2006, 02:35 PM

Thanks Scr38...yeah...I just re-read that...Doh....my mind say tis and my fingers say that....I meant to say:

I have heard what sounds like lifter noise that could be associated as knock.

helomech · 05-12-2006, 03:28 PM

Quote:

Originally Posted by scr38

Randy, there won't be any lifter noise with our DOHC engine.

Why can't a DOHC engine have lifter noise?

m95roadster · 05-12-2006, 04:26 PM

Quote:

Originally Posted by scr38

Randy, there won't be any lifter noise with our DOHC engine.

Why is that scr38? There are valve lifters in the Endurance.

sudden urge · 05-12-2006, 04:34 PM

The valves drive directly off the cams, no lifters involved.

m95roadster · 05-12-2006, 04:41 PM

Quote:

Originally Posted by sudden urge

The valves drive directly off the cams, no lifters involved.

Right, but what's under the cam is called a valve lifter.

sudden urge · 05-12-2006, 04:59 PM

You're thinking of NON overhead cam engines. Overhead cam motors don't have lifters or pushrods.

m95roadster · 05-12-2006, 05:06 PM

Quote:

Originally Posted by sudden urge

You're thinking of NON overhead cam engines. Overhead cam motors don't have lifters or pushrods.

No I'm not thinking of NON OHC. I don't have experience with those types of motors. There are in fact valve lifters (followers, buckets, whatever you want to call them) in OHC motors. Hondas are notorious for valve lifter noise.

sudden urge · 05-12-2006, 05:09 PM

by Larry Carley;

One of the advantages of an overhead cam cylinder head is that it eliminates the need for certain valvetrain components. Mounting the camshaft in the cylinder head rather than the engine block eliminates the need for lifters and pushrods. On some OHC engines, the cam lobes run directly atop the valve stems. On others, cam followers or rockers and hydraulic lash adjusters are used to operate the valves.

m95roadster · 05-12-2006, 05:13 PM

Quote:

Originally Posted by sudden urge

by Larry Carley;

One of the advantages of an overhead cam cylinder head is that it eliminates the need for certain valvetrain components. Mounting the camshaft in the cylinder head rather than the engine block eliminates the need for lifters and pushrods. On some OHC engines, the cam lobes run directly atop the valve stems. On others, cam followers or rockers and hydraulic lash adjusters are used to operate the valves.

A cam follower is also known as valve lifter. Didn't I say that in my previous post? OK, now I'm going to have it bust out the SM.

sudden urge · 05-12-2006, 05:18 PM

As that paragraph states:
On some OHC engines, the cam lobes run directly atop the valve stems.

m95roadster · 05-12-2006, 05:21 PM

Here's a pic from Nissan's Service Manual.