Massive Knock From Rb20

[vsute]

Hey guys i am getting a repeditive high note knocking comin form my rb20det which is coming from the centre of the motor. Would this be pistons posably no.3 and 4. is there any chance that it could not be the bottem end?? the knock goes up as the rpm does. The engine it standad running a cooler , rb25 turbo and standard boost. Any ideas ?? its goes to the shop on monday but some advice would be great. Thanks

[bogcock]

does it do it on idle or only under load?

[Denver]

big end by sounds of it, either way its not sounding healthy, don't drive it, and get it towed to the shop

[BezerkR32]

Pick engine rpm up then disconnect one coil plug at a time. this will take the load off that cylinder. if knock is less noticable, then it is a 90% chance you have turned a big end bearing or broken a piston in that cylinder.

  vsute said:

Hey guys i am getting a repeditive high note knocking comin form my rb20det which is coming from the centre of the motor. Would this be pistons posably no.3 and 4. is there any chance that it could not be the bottem end?? the knock goes up as the rpm does. The engine it standad running a cooler , rb25 turbo and standard boost. Any ideas ?? its goes to the shop on monday but some advice would be great. Thanks

[vsute]

does it on just above in idle like 2000rpm. i pulled the coil plug one by one and it didnt change at all. It does sound high up in the motor but im pretty sure that its munched

[The Mafia]

rb30 time

[Turbine]

If the knock goes away under slight load and returns when you back the throttle off it will be big ends.

Just finished a rebuild on RB20DET that had the oil pump screws work loose dropping oil pressure, destroying big end bearings.

I'd be interested how much that repair is by a shop.

[The Dan]

Anyone ever heard of a hydraulic lifter?

I guess not

[SECURITY]

im thinking lifters too.

is it a light tapping (in the head) noise that gets quicker as the rpm rises or does it sound like theres something loose in your bottom end? if you stick your head under the car can you hear it better?

[vsute]

it does sound louder above the motor. just hoping that its not something too expensive. wats a hydrolic lifter do? is that like simaliar to roller rockers ?

[SECURITY]

theyve pretty much got the same purpose of roller rockers.

they sit right under the cam shafts, its the first thing you'll see once theyre off.

it shouldnt be too expensive to fix, i got away with replacing my lifters that were stuffed without undoing the timing belt tensioner. each lifter cost me $75 each with the SAU discount from nissan, retail is around the $118 mark, someone said that UAS in sydney sell them for $45 each.

[str8g]

Hey Ive got an r33 and im getting pretty high knock readings from my power fc, about 60-80. Jus wondering whether it could be my lifters as well. How much did it cost you to get the whole job done. How many lifters are there? I presume 6 for a six cylender?

[vsute]

the noise is louder under the car but i think thats becauseof the echo off the ground. also interested in wat it cost you all up

[The Mafia]

  str8g said:

Hey Ive got an r33 and im getting pretty high knock readings from my power fc, about 60-80. Jus wondering whether it could be my lifters as well. How much did it cost you to get the whole job done. How many lifters are there? I presume 6 for a six cylender?

umm.. dude have you ever considered that the car might actually be pinging?

....

[str8g]

Thats what i thought first but my mechanic said that my lifters might need replacing soon. Im getting a re tune done next week so hopefully this problem will be solved.

[SECURITY]

you're getting a knock reading, this guy is getting a knock sound.

a tune will fix your knock reading, but as far as i know 60-80 is normal on a pfc? dont quote me.

there are 4 for each cylinder... 2 on the inlet side and 2 on the exhaust side.

the knock sensors are in the block.. they wont detect the lifters in the head.

[vsute]

found out today that its the bottem end bearings. so time for another engine..any one know where to get a good reliable rb20 from ?????????

[Mandingo]

  vsute said:

any one know where to get a good reliable rb20 from ?????????

LOL

RB30

Edited June 26, 2006 by Flipmo

[The Mafia]

  SECUR1TY said:

but as far as i know 60-80 is normal on a pfc? dont quote me.

knock that high will make pistons look like the ones in you avatar..

[SECURITY]

  The Mafia said:

knock that high will make pistons look like the ones in you avatar..

thought so, thats why i said dont quote me .. i remember reading somewhere that the pfc knock sensor isnt that accurate.