knocking

[Eddie the Eagle]

when i first start m,y engine if its cold(not been started for around 6hrs) its sounds like its knocking but after 30-60 secs it stops, then its a sweet as a nut and you can hardly hear the engine from inside the car even while accelerating

[gtstarga]

I have heard about cam rattle. This is when the cams have worn very slightly and it is not until the metal expands and fits into the bearings that it goes quiet. Ask Ed(darket69) he is the one I heard

[Eddie the Eagle]

worn cams, its only don 85k.well if it is its a good thing i have another entire mkiii for spares. how much would new cam shafts be, maybe i could get high lift ones, or just use my spare ones, as long as they aint worn should be ok huh?

[darket69]

its nothing to worry about .. what targa was trying to explain was cam end float .. this is when the cam wears a tiny amount and slides very slightly from back to front causing it to "knock" on the bearing jornals .. there is nowt you can do about it and it will do no harm at all (can also be caused by a slightly over tight cambelt).. also suspect a worn water pump bearing, idler bearing or alternator.

[Bondango]

have u checked it for oil?? lasy oil pump??? does the oil system presurise slowly??

[Eddie the Eagle]

the oil level is fine. when its cold the oil pressure seems high, ie. 70-80 at about 2000rpm but when its warm its 70-80 at 3000rpm. when i start it the oil pressure goes straight to 60 but when warms its idles at 40

[suprastallard]

that sounds a bit high to me?

mine when cold goes to 40 when warm idels just above 20? which i thought was the norm, both i have owned have been the same and me mates ones are the same?

[Bryank]

that sounds a bit high to me?

mine when cold goes to 40 when warm idels just above 20? which i thought was the norm, both i have owned have been the same and me mates ones are the same?
Sounds right for a N/A motor :D (N/A's oil pressure is mucho higher than a turbo due to the lack of a turbo oil/return feed system and oil jets)

For the record, both my N/A's have done this.. They hate being left to stand overnight for some reason, esp after a longish run.. In fact my first motor developed this rattle at cold startup, but would not do it when starting from warm.. slowly it got worse, getting to the point when every time you started it, it would rattle.. in the end i changed the motor as i thought it was going to die totally :( (it had only done 75k, and was doing it since 64k.. no way big ends would have survived 10k+ miles if they were that shot!) my current motor does it sometimes, but not always.

It 'sounds' like the big ends are shot, but as you said, after running for a short time (few seconds) it stops totally and runs sweet as a nut and silent, even when thrashed. Oil pressure is fine as well, and climbs immediately on start. Flippin strange, and the guess is that it's just wear in various places that tighten up when warm and the oil gets circulating..

[suprastallard]

lol sorry should have read it properlly didnt relise it was a n/a

[Eddie the Eagle]

its the choke, its running rich and the timing is slightly out spent all night on she's fine now. cheers any way lads