Whats The Noise

[Guest trikdoutvl]

have a listen and discuss

http://s260.photobucket.com/albums/ii14/tr...enginenoise.mp4

[BANGN]

sounds like big end or piston slap

does it go away when it gets warm or more noticeable when cold?

Edited June 16, 2010 by BANGN

[snozzle]

definitely a big end bearing

[XxNinjaxX]

if its a big end it will be louder at higher engine temperatures cause the oil becomes thinner.

if it only happens when its dead cold and totally goes away once the engines warm i'd be leaning towards possible sticking lifter or if its there all the time damaged hydralic lifter.

[snozzle]

you'll be suprised with lifters, they tend to "tap" more so when engine is warm but then again, lifters can be very un-predictable as they come and go.

the knock in the video is only there once there is enough load on the piston to push away the oil in the bearing so that it "slaps", on idle theres no knock as the oil pressure is sufficient to patch up the noise.

[XxNinjaxX]

ok so possible knock causes,

big end failure, lifter failure, fact the rb is in a holden

is the knock there all the time or just until the engine warms up?

[libardi]

sounds exactly like my RB20 when it did a big end bearing =(

[Guest trikdoutvl]

engines not in a holden its a r31 I just brought.. dunno if the noise goes away after a while the car is unregod so i havent had a chance to take it on a drive..

I thought big end aswell just wanted other opinions.

[BANGN]

its not biggy tho really dude..

Take the crank out before it causes more damage, grind it down 20 thou and put some bigger shells in.

cheaper than a motor