The Dreaded SR20 VCT rattleVct rattle
Posted 09 July 2017 - 12:48 PM
This is my current situation, so maybe 3 months ago my engine got rebuilt, while going through all the stuff that I was upgrading they said do you want a new vct gear and solenoid, I said with the amount im spending at the moment i really cant afford to.
Later down the track i decided that i would get rid of that dreaded rattle and bought a new gear. They put it in with the old solenoid as the old solenoid was functioning fine. I got my car back and for about a week the noise was completely gone then it returned, I had the workshop look over it , they spent 3 days searching for answers and were completely stumped. Everything was working fine oil was getting where it needed to, the solenoid was still working. They tried different oils
After been completely stumped i stumbled across a forum post on here talking about how someone just replaced the gear without the solenoid and within a week had the rattle back. I thought well ive wasted money on this gear maybe that solenoid somehow is screwing up. So i bit the bullet spent more money on , A brand new gear (again) and this time a brand new solenoid.
Both replaced and again the rattle has been gone for this time bout 3 weeks. This morning i noticed what i believed to be the vct rattle again, it was while the engine was semi cold and when I got back home after about 40 minutes the rattle under slight acceleration could not be heard. Im hoping I was hearing things but I wanted to know everyones thoughts on what the hell is going on with my sr.
I warm up my car, i don't push it until its warm, There is only really those two components that can cause it so surely replacing them should eliminate the problem but obviously we are missing something. Just need some help finding my next steps, ive searched a lot and i cant seem to find anyone that has had similar issues, replacing the gear and solenoid seems to always work.
I have got upgraded cams, Nissan , Kelford, my engine builder and workshop are completely stumped.
Any suggestions would be great.
Posted 09 July 2017 - 04:28 PM
Posted 10 July 2017 - 12:13 PM
They are maybe suggesting valve springs could be causing the issue?
Posted 10 July 2017 - 03:01 PM
Are you running aftermarket valve springs? Stiffer springs like the BC ones can shorten the life of the VCT I believe.
Posted 10 July 2017 - 07:35 PM
I put the standard valve springs back in and a brand new gear which then failed completely after a couple of weeks (it never became noisey - it stopped working altogether).
I ended up putting the noisy VCT gear back in and funily enough it was completely dead quiet and remained that way for approximately 20k kms.
The car now has another brand new gear in it and is dead quiet.
Posted 11 July 2017 - 03:28 PM
Posted 11 July 2017 - 03:54 PM
Posted 11 July 2017 - 07:26 PM
Posted 12 July 2017 - 08:56 AM
Posted 12 July 2017 - 10:42 AM
Edited by JeffAmentSlash, 12 July 2017 - 10:48 AM.
Posted 12 July 2017 - 03:06 PM
Posted 12 July 2017 - 03:29 PM
I was talking to the guys to find out what deleting VCT would do and they said it would feel a little bit less responsive. Has anyone removed VCT from their sr20 for any reason and how did they find it. Obviously I want this to be the absolute last resort but I really do feel like I'm running out of options. These are guys who work on imports day in day out for many years, if they are clueless I am beyond clueless. Everyone I have spoken to has never heard of it coming back that quickly. Like i said 700km? Surely there is a bigger issue here.
Appreciate the help sxytime
Posted 12 July 2017 - 07:04 PM
but yeah grade of oil. springs and grind of cam can all play a part.
from what i very loosly remember. how hard the cam ramps down can play a part ? could be wrong, but someone had a theory on agressive cam lobe design once many years ago, and stiff springs to stop valve float, combined buggers teh VCT?
good oil plays a big part.
i got about 7000kms from my stock vct before it started playing up after i put in procams and type a springs. need bigger springs though, as getting valve float.
Posted 13 July 2017 - 04:30 PM
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