Another nasty noise thread... (****!)-please help - Update 27.04.09
I think I have to get used to get the engine rebuild...
I drove around a bit today, also at the German Autobahn, as I experienced some slight bogging at ~6.000 rpm (5th gear) - boost ~10PSI.
Had a look at the gauges, watertemp was high but O.K. - I think ~95°C-100°C (200°F-212°F), Oilpressure was good ~4bar, but Oiltemp was really high at *125°C (*257°F).
I slowed down immediatly and everything seemed fine. But as I got off the Autobahn and could hear a bit better, I heard a faint knocking sound.
Car is driving O.K.
Here is a video of the sound:
I think it's a bend rod?!
Yes I know, actualy I had a look at my log and the watertemp was at 84°C max which is rather cold (but it's also only ~20°C outside).
When I had my turbo-kit installed a long time ago they fucked up the oil-return, metall shavings were in the oil-sump and held the oil relieve valve open. No oil pressure = bearings went to hell.
They rebuild the engine with a new head and I suppose they did something not entirely correct which was a kind of weak point.
Now - go 1,6 with forged rods and pistons or go 1,8. (I like the fast spool-up of my 1,6 with fidanza flywheel - so maybe I should rebuild the 1,6) Hopefully the 1,6 90-93 pistons (wiseco or such ) fit. If I see this correctly rods should be the same for the 1,8 and 1,6...?!
I just made another vid as I brought my car to the garage:
The noise is very loud at cold start, seems to get better when warmed up. Sometimes at idle it's nearly gone, but when I rev the engine it's getting louder. It is completly gone when I pull off the gas.
Sound comes from the back upper part of the engine.
I switched to our NA Miata just after that and one of the hydraulic lifters was a little stuck, the sound was nearly similar.
Could it be, that one of the valves is damaged? The car seems to run flawless otherwise.
I don't know why you guys keep trying to fool yourself into thinking that kind of noise is something other than real bad news. if it was valves or related, it would be more of a chatter. what you have there; son, is knock. it could be rod( big or little end), or it could be piston. either way quit driving it, and ffs quit making videos of you reving it. you are doing nothing but making the situation worse and potentialy ruining a crank that might be savable.
Well, I think I made clear that I already made myself comfortable with a engine rebuild. But as I haven't got an engine hoist, I needed to go to an garage. So this was the last time the engine was running - and moreover this was the last video... I just made this video because the sound was a little changed, when I brought the car to the garage. (I didn't especially make a new video to annoy you )
Today I will know if it has got something to do with the valves - other wise I already sourced a used 1,6NB engine with 68.000km (not mls). Which I will swap in and do an engine rebuild with all necessary new and improved components next winter. That is the best soultion to get me back on the road soon.