# Engine knock diagnoses

**URL:** https://forums.speedlife.net/t/engine-knock-diagnoses/159521
**Category:** SON240sx Automotive
**Created:** [August 25, 2010, 12:58pm UTC](https://forums.speedlife.net/t/engine-knock-diagnoses/159521 "2010-08-25T12:58:02Z")
**Posts on this page:** 6
**Page:** 1

<div class="post-metadata">

### Author: ![Tacoboy](https://avatars.discourse-cdn.com/v4/letter/t/2acd7d/32.png) [@Tacoboy](https://forums.speedlife.net/u/Tacoboy)
#### Post date: [August 25, 2010, 12:58pm UTC](https://forums.speedlife.net/t/engine-knock-diagnoses/159521/1 "2010-08-25T12:58:02Z")

</div>

Motor setup, Top down.  
Stock cams / BC272 cams, stock rockers, stock lifters, BC titanium spring/retainer kit.  
Stock valves  
Cometic HG, ARP studs  
Arias pistons, Eagle Rods, ARP bolts. Motor has 8500 kms since fresh rebuild with all OEM seals / gaskets / bearings.  
Greddy 5l oil pan  
15w40 oil. Oil pressure is between 30-100 depending on temp, and rpm.

This motor has been driven with this noise for 500 HARD kms. 20 psi on BC 272 cams putting down ~300whp. Ran a 12.8 @109 on this setup, with this ignorant tick. I think that if it were rod knock, the bearing would have self destructed by now, or the noise would have at least increased in volume / change in sound.

What happens:  
When cold (oil cold, first 45 seconds – 1 minute) operating, no knock/tick  
Knocking/ticking noise between 2200-3500 rpm, on accell and decal, regardless of load.

What I’ve done:  
Changed cams, rocker arms, lifters, to try and eliminate the head as the issue. Now im stumped. Here is the video

[![http://i114.photobucket.com/albums/n260/daveowen/th_VID00000-20100825-1442.jpg](http://i114.photobucket.com/albums/n260/daveowen/th_VID00000-20100825-1442.jpg)](http://s114.photobucket.com/albums/n260/daveowen/?action=view&current=VID00000-20100825-1442.mp4)

---

<div class="post-metadata">

### Author: ![KA24Power](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/ka24power/32/5595_2.png) [@KA24Power](https://forums.speedlife.net/u/KA24Power)
#### Post date: [August 25, 2010, 2:44pm UTC](https://forums.speedlife.net/t/engine-knock-diagnoses/159521/2 "2010-08-25T14:44:22Z")

</div>

pull your belts off and see if it goes away? I’ve heard some water pumps make a noise like that before

---

<div class="post-metadata">

### Author: ![james\_specv](https://avatars.discourse-cdn.com/v4/letter/j/82dd89/32.png) [@james\_specv](https://forums.speedlife.net/u/james_specv)
#### Post date: [August 25, 2010, 6:17pm UTC](https://forums.speedlife.net/t/engine-knock-diagnoses/159521/3 "2010-08-25T18:17:23Z")

</div>

timing chain guides could be warn, known to make knock against valve cover at operating temp

---

<div class="post-metadata">

### Author: ![rex\_thugs](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/rex_thugs/32/5598_2.png) [@rex\_thugs](https://forums.speedlife.net/u/rex_thugs)
#### Post date: [August 26, 2010, 8:19pm UTC](https://forums.speedlife.net/t/engine-knock-diagnoses/159521/4 "2010-08-26T20:19:17Z")

</div>

yeah i was think timing chain guides as well.

---

<div class="post-metadata">

### Author: ![derass](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/derass/32/5691_2.png) [@derass](https://forums.speedlife.net/u/derass)
#### Post date: [August 26, 2010, 11:07pm UTC](https://forums.speedlife.net/t/engine-knock-diagnoses/159521/5 "2010-08-26T23:07:36Z")

</div>

definatley some chain rattle going on there…i used to own a vr6…same thing

pull the valve cover and see if the plastic guides are broken/damaged or if there is slack in the chain…ideally there should be none

---

<div class="post-metadata">

### Author: ![Tacoboy](https://avatars.discourse-cdn.com/v4/letter/t/2acd7d/32.png) [@Tacoboy](https://forums.speedlife.net/u/Tacoboy)
#### Post date: [August 27, 2010, 8:41am UTC](https://forums.speedlife.net/t/engine-knock-diagnoses/159521/6 "2010-08-27T08:41:51Z")

</div>

None of you think its rodknock?