VE30DE Engine. With aparantly low km (JDM From Japan) recently replaced... running great but makes a kind of chain whirling sound on hard acceleration in any (5 sp.) gear.

Is this vtc noise perhaps (no ticking at idle) or is this "normal"
Thanks in advance for your suggestions

 

probably one of the bearings in the tranns

 

what about in nutral? still make the sound?
if it doesnt.. then it isnt the motor.

 

As the engine has been recently installed, is there ? smtg loose or is the engine, exhaust, alt., etc touching chassis. Prop engine in place with some hard rubber to limit its tilt on accel (tst).

Can u duplicate the sound while parked? Clutch pressed or off.

Did u change the tranny?

 

yea, and my VG sounds like an old diesel truck. i can hear the valves ticking away ni the engine.. how do i mute them?

 

Hi,

actually it could be your exhaust stud that are clicking,

 

Thanks to all who shared their thoughts. Some replies...

1. No I didnt change the 5 speed tranny but yes, I did put in a new Nissan Clutch. Not entirely sure the fluid is at the right level. Perhaps its a little high. How does one check tranny fluid level on a standard?

2. Havnt tried checking the tilt on hard accelleration with hard rubber to limit the tilt, but this is a very interesting idea.

3. I dont think anything is loose as there is no hint of this sound at gradual acceleration. It only becomes obvious, with high rpms (BTW is it safe to run a VE over 4000 rpm on accelleration from time to time?)


4. No, it doesnt make the sound even on high rpm when out of gear.

innnnnntreeresting.....

 

safe to run a VE over 4000rpm?!?! :LOL:

mine usually doesn't go BELOW 4000rpm!
218,000 miles on my engine and I spend hours each month at the race track bouncing off the rev limiter!


I'm going to take a wild guess and say it's probably the transmission bearings, but I'd have to personally hear it to make a definite conclusion.

 

1.a. Taking tranny out, installing back does not break its bearings, never.
1.b. Oil level is not a noise problem; generelly oil level is on the fillup hole level. Open filler screw, all excess will come out...

3.a. Without hearing, points to loaded engine parts.
Crank bearings? Might be a problem, might not. Clutch fits that definition, but cannot figure out how it fits with such noise...
3.b. Theres a rpm limiter at 6500 VGE, VE?, safe up to that. Low rpm always -mode harms even more: soot buildup in all places, cause of pre ignition etc...

4. --->3.a.

5. Concentrate [first] on issues that have changed, that were moved or worked on.

 

Don't get me wrong now, I love to drive the car hard... its just that with this chainish sound kicking in when I drop down a gear and let 'er rip, it's hard not to feel like I'm killing something. Remember, the origional engine blew a hole in the side of the block while I was driving it... it's hard to forget that kind of grief. (see: below)

I noticed something interesting today while weighing all your insightful suggestions...
I can accelerate all the way up to (and past?) 4500 rpm without hearing the sound as long as I don't accelerate hard. A nice smooth accelleration does not trigger chainish sound. Hmmmmmmmm. So yes, it must be something under load...?

It seems to be on the passenger side. Curiously nobody seems to think it actually one of the 3 chains. Surely they have to work harder and get a- flyin' when you step on it?

(BTW as a sidenote, origional 300,000k engine blew up accelerating from 5 kph to about 30 kph... sadly, I have to note I was in 3rd when I should have been in 2nd. It was pulling pretty hard. Bad Idea. Bang! the rpm limiter kicked in and I couldnt get it over 2000rpm. It stalled. I looked under. oil everywhere. A hole the size of my fist, next to the water pump. Middle of nowhere, no cellphone reception..... So began a year sitting in a garage... Enter a new attitude, a JDM, Nissan clutch, driveshaft and its back!) Im soooooo happy.

 

In that case, it may be a chain tensioner or the VTCs clattering away. mine get quiet when I put them under load, but I've heard of others getting louder. strange.
It would definitely be worth pulling the valve covers and/or timing covers and see how the chains look and what kind of tension they're under.
might save you another engine.

 

"Curiously nobody seems to think it actually one of the 3 chains. Surely they have to work harder and get a- flyin' when you step on it?"
- No difference on load there when u are parked and hit the gas... the alt etc. does not know your speed...

- Cannot see whats the difference on chain tension, either... the valves, chains etc. does not know your speed...

 

Maybe it's the catalytic converter. My friends car made a similar noise coming from the rear exhaust area.

 

Didn't the original poster just mention the noise was coming from the engine area??? If so, how could the problem be the converter?

 

Also, the poster said no sound when not in gear, so can't be converter?

 

Yeah, I think it can Jeff.

 

Think some more then.

 

I suppose ? all our inputs are just about all. Ten there's always the squirrel family -effect possibility. One has to get soundbite to guess more... and drive the car to be (eh, almost) sure.

At night I was also thinking about [crank], rods, pistons, or rings: they are affected by load. But valvetrain is kinda freefloater, is only affected by rpm [thereby noisy as car standing also].

Alternator etc. thingies are like valvetrain: but they are easily tested by taking belts off and driving.

 

The valvetrain on our cars is also affected by load. The VTCs engage/disengage based on engine load and RPM. this will put more or less stress on the timing chains as it switches on and off.

 

Jasså.

Then that is the first problem candidate in this chain. Still cannot figure out how the valves/cam/chain can be more stressed in timing variation, tell me. But if it does not put more stress, then anyhow there is a difference between standin/driving...

 

I think if I was blackmax42, I'd do what you said above first. I mean, it doesn't hurt to start ruling out the obvious (and the less obvious) things, no?

I had that annoying intake door gear snapping sound behind the dash, and stupid me just drove around with it, trying to rack my brain on what it could be. One day I decided to stop being lazy and decided to reach under and un-hook the blower motor harness. That stopped about 10 people's (including local mechanic who was swearing to me that it was) thought that it was the blower motor...

Lesson learned for me, ask questions once you have started some deductive elimination process...

 

Complicated chain of events troubleshooting starts from the middle [if possible]. after that, from '20 suspects' only ten left. Do it twice and 'five' left... If u cannot focus more, just replace 'all five' - will be cheaper than waiting for kids to break/steal u equipment...

There are many kind of systematic approaches in troubleshooting taught in unversities, like Kepner/Tregoe. However, intuitive creative thinking beats them all in speed. If that stalls, the systematic approach always gives results. Sigh. Not one stealerships serviceman on the globe has ever heard of the systems...