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 Sr20det Knock Sound - Very strange  

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88MSE
  • 88MSE
  • FOR SLUTTIN
  • Member No.: 33,518
  • Joined: 10-October 05
  • Posts: 2,380
  • From: Australia
Post #1 post 17th December 2007 - 11:54 AM
Hey everyone.

Posting on behalf of a friend, due to being partly my fault. Run down is SR20DET in an S13, simple breathing mods FMIC, exhaust, pod. Run stocks boost and the rest is pretty stock too.

Driving it Saturday night, my mate let me 'have some fun'. Did a couple of quick hoops in a vacent lot (dont give me illegal skids bullshit, not the topic for that). Now when i say a couple, i mean 3 very quick loops one after the other in 2nd gear, hit limiter once. Drove the car back down the road and parked it. My mate then said 'no no park it how i had it' so i reversed it and spun around and backed it back in.

During all this, there was no sounds coming from the motor at all. We then decided to leave the area and when we did, it started making a knocking sound. Its only under low rpm (between about 1700 and 2300) under strain. At higher revs hard out it makes no noticeable sound AT ALL.

So when we had a chance i did the basic checks. Looked at the oil. Oil is low, thick and black. So im sure thats partly the problem. Took the oil cap off and it had some serious blow-by coming from the oil cap. The noise sounds very high up, like in the head, not the block. So im thinking maybe its not a bent rod or something similar, but more like a valve spring or something up in the cam (im no mechanic so im just going off past experience with my gemini)

I believe its something to do with the oil and poor previous treatment (last owner thrashed this car, we've found the evidence.) My thinking is oil and filter change with some synthetic oil. Any other suggestions or information would be great. Thanks guys

--------------------
I'll just tell it how it is.

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speed racer
Post #2

Sounds like what happened to one of my old cars, but I needed a new engine.

I think you will need more than just an oil change - but I'm no mechanic!

TwinCam16
Post #3

Bottom end.

8OSANAC
Post #4

shitty oil clogs your lifters and then makes tappy noise. Do an oil cahnge with some good oil and chuck in some engine flush lifter cleaner stuff. Its probably not that but if your oils that dirty as you say it'll be the first most noticable thing that go's.

speed racer
Post #5

QUOTE(TwinCam16 @ Dec 17 2007, 12:05 PM) [snapback]1281726966[/snapback]

Bottom end.

exactly what happened to mine, so I'll vote for this one too.

TwinCam16
Post #6

Usually if its lifters, the sound will be on idle, bottom end is a strong solid knock....

speed racer
Post #7

QUOTE(TwinCam16 @ Dec 17 2007, 12:10 PM) [snapback]1281726995[/snapback]

Usually if its lifters, the sound will be on idle, bottom end is a strong solid knock....

ooh yeah, by the time I drove back from the Gold Coast, my car sounded like a train.

TwinCam16
Post #8

Em..... please.... stop.... your making yourself look blonde tongue.gif

88MSE
Post #9

QUOTE(speed racer @ Dec 17 2007, 12:13 PM) [snapback]1281727014[/snapback]

ooh yeah, by the time I drove back from the Gold Coast, my car sounded like a train.


Well its not that loud but is noticeable.

Also the sound is there on idle, just not as loud.

dustindrift
Post #10

bearings / bottom end

which usually ends in bent rods / fucked crank

Samboi
Post #11

Big end bearing, u need a bottom end rebuild, happened to my mates sil, thrashing it with low and dirty oil.

88MSE
Post #12

Alright so lets say bottom end needs replacing. Whats the rough cost inc all parts and labour? And where is a good place to get this done around Ipswich/Brisbane

TwinCam16
Post #13

It wouldnt be worth it.

Not unless you wana go full on internals.

Just get another motor and be done with it.

GTR120WHY
Post #14

My mate is selling his SR20. Just been rebuilt by Mark Ashford Racing. Built tough with all top shelf items. It is in his Escort now that he has given up on the project because a Kustom Paint Dr took 1.5yrs to paint the car. PM me if you want to spend 10K plus, or call Mark Ashford and get the specs of it. smile.gif

TwinCam16
Post #15

Also might be worth noting, the cranks on sr20s crack when you so much as look at them th wrong way, yours will now be cracked. so finding another that isnt cracked is going to be a mission.

GTR120WHY
Post #16

QUOTE(TwinCam16 @ Dec 17 2007, 12:54 PM) [snapback]1281727178[/snapback]

Also might be worth noting, the cranks on sr20s crack when you so much as look at them th wrong way, yours will now be cracked. so finding another that isnt cracked is going to be a mission.


My mate got a brand new one because they couldn't find a decent one second hand.

avalonea
Post #17

*coughs*

pull the coil packs off the spark plugs one by one ( or unplug them so you don't slip and whack yourself ) and see if the noise gets quieter.

If it does. you've done the old ( lets pork/spin/strip the thrust bearing ) trick thats synonymous with poorly maintained engines. Especially while drifting as its a prime time to starve the engine of oil pressure ( there for not lubricating the engine properly ) and / or put the necessary strain/conditions on the engine to spin/stuff a bearing.

for 1-2k could you have the engine striped new bearings / rings etc. IF nothing else is damaged. although getting a lower k' 2nd hand engine from a reputable company is prolly the best idea ( and most common )

`josh

Nick_RA40
Post #18

Ok so this is my car.

The noise happens under partial accelaration irrelevant where it is in the rev range. Drive has remained the same, acceleration, traction, boost is all the same. It doesn't shudder any more than it used to either so I don't think anything has snapped/cracked or broken or SOMETHING would have changed, amirite?

TwinCam16
Post #19

No, doesnt mean jack.

My sss still had the same power when spun the bottom end, was holding boost fine.

Do what Josh said, pull each coil pack off one at a time, thus effectivly shutting down a cylinder and see when the noise stops.

8OSANAC
Post #20

meh chuck some thicker oil in it, it'l shut it up for a bit.

TwinCam16
Post #21

Saw dust...

avalonea
Post #22

QUOTE(8OSANAC @ Dec 17 2007, 03:14 PM) [snapback]1281727661[/snapback]

meh chuck some thicker oil in it, it'l shut it up for a bit.

stupid.

it may shut it up for a touch. but your will be scoring your crank and rods/caps beyond repair.

do what i said and reply if it doesnt shut up.

`josh

Nick_RA40
Post #23

QUOTE(avalonea @ Dec 17 2007, 03:50 PM) [snapback]1281727774[/snapback]

stupid.

it may shut it up for a touch. but your will be scoring your crank and rods/caps beyond repair.

do what i said and reply if it doesnt shut up.

`josh


Certainly will check it out once this rain blows over.

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