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I have noticed that my engine has been sounding weird lately, almost like the noise you would expect to hear out of a helicopter lol. does anyone have any idea what could be wrong? as far as the head goes, i have a crower turbo cam with the valve springs and retainers. you can hear the sound best when the camera pans over to the valve cover. let me know if you have any ideas. thanks.




Modified by abmerop18 at 1:49 PM 7/15/2006

 

u sure your timing belt isn't just loose?

put it at tdc, then loosen the tensioner,
then rotate it a few teeth, then tighten it back up and see how she sounds.

 

or maybe the camshaft gear bolt, happened to me and had a similar sound

 

i just did a compression test and it was a solid 210psi across the board

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tad &raquo;</TD></TR><TR><TD CLASS="quote">u sure your timing belt isn't just loose?

put it at tdc, then loosen the tensioner,
then rotate it a few teeth, then tighten it back up and see how she sounds.</TD></TR></TABLE>

my car has an auto tensioner

 

there is no slack in the tension on the timing belt and the cam gear is securely torqued to the camshaft

 

did u do a valve adjustment? i hearsome pretty loud valve clap, could be the timing belt loose and hitting the timing plastic cover

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SPNFEDEH &raquo;</TD></TR><TR><TD CLASS="quote">did u do a valve adjustment? i hearsome pretty loud valve clap, could be the timing belt loose and hitting the timing plastic cover</TD></TR></TABLE>

yea i adjusted the valves to the specs specified by crower.

 

I dont know what that is, but I bet you will have one hell of a noise when that Crower Cam breaks in half.


Modified by 96 GSR-T at 2:43 PM 7/8/2006

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 96 GSR-T &raquo;</TD></TR><TR><TD CLASS="quote">I dont know what that is, but I bet you will have one hell of a noise when that Crower cam breaks in half.</TD></TR></TABLE>

 

broken valve spring? piston slap-wrist pin problem? hard to say, good luck.

 

sounds like valve lash and maybe piston slap to? I would adjust the valve lash to OEM specs

 

any other ideas?

 

sounds like bad valve adjustment or loud injectors

 

put a long extension on one of your injectors clips and put the other end kind of in your ear and see if the sound isn't just your injectors. Does it make this sound all the time or only when cold/warm?

 

RODS ARE GOING OUT

 

i think it might be the injectors since they are only 310cc and i have been pushing them close to 100% duty cycle. i tried to tell where the noise was coming from and it is defeniatly coming from the left side of the bay near the injectors and not the timing belt. and this just started recently, so its not like its a bad valve adjustment cause it was fine before when we adjusted it. so would it make sense that if the injectors went bad, that they would be making a noise like this? guess its time to upgrade my injectors...

 

Did this happen after a hard run or regular driving? Does the sound get faster as the revs go up? It sounds like a rod bearing. I thought my friends was loose valves and told him to adjust them. A week later a rod adjusted itself out of the block.

 

not quite sure when it exactly started, but its been like this for a good 2-3 weeks. i cant really hear it over the engine when the car gets going, its mostly noticeable when idling or when downshifting to slow down.

and if it was a problem with a rod or the engine, wouldnt that show when i do a compression test?

 

damn the rod knock from hell!!!

and no, the rod knock will not show up on a compression test, unless the gauge reads "0".

 

compression test wont do anything for bad bearings.

Safest way to tell if its your bearings is drop the pan, rod and crank caps, and inspect the bearings, look for scarring/blue discoloration. If your bearing has spun its only going to do more damage the longer you let it go and like stated above will end up throwing a rod and really f*cking **** up.

Of course if your inspect your bearings and they are all good then you have that peace of mind and it really isnt that hard to reinstall it all its just takes some time, tq everything to spec!

If it is a bad/spun bearing inspect the rod and crank for scarring, if it is scarred it will need to be fixed.

 

i should also add that my car is pulling alot of vacuum, but not all the time. sometimes when idling, it will pull between 18-14 in mg of vacuum at idle and other times it will only pull 21-19 in mg at idle. also, if it makes a difference, when i have it in gear and let off the throttle so it costs, it always holds a steady 21ish in mg of vacuum.

 

Rod knock is like a clack clack clack clack.

Interesting enough thats a cool sound.

Is that the dx d17?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MidShipCivic &raquo;</TD></TR><TR><TD CLASS="quote">Rod knock is like a clack clack clack clack.

Interesting enough thats a cool sound.

Is that the dx d17?</TD></TR></TABLE>

its an lx with a vtec head swap

i am still set on it being the injectors due to the fact that it is coming from that area, but i would still like some more input on this.

 

sounds like bottom end