robhull Posted January 22, 2015 Share Posted January 22, 2015 I have noticed a quite knock coming from the engine it only happens when cold the throttle is lifted slightly for a second. on tick over higher revs or when hot there is no knocking any ideas ? The car is a 2000 turbo Quote Link to comment Share on other sites More sharing options...
quit Posted January 22, 2015 Share Posted January 22, 2015 Bottom end failure, or a little bit of piston slap Quote Link to comment Share on other sites More sharing options...
Ash007ks Posted January 22, 2015 Share Posted January 22, 2015 As matt has said, from what it sounds like its going to be bottom end, most likely the crank walking. Quote Link to comment Share on other sites More sharing options...
Gambit Posted January 23, 2015 Share Posted January 23, 2015 Yeah I think its piston slap bit thicker oil sometimes quietens it. Shouldn't worry to much. Well unless it gets worse and all the time. I wont scare you with what that is. Just you tube bigend failure. I'd link it but on my phone at the minute. Quote Link to comment Share on other sites More sharing options...
robhull Posted January 23, 2015 Author Share Posted January 23, 2015 Don't think it is bottom end due to i would be there all the time hot and cold and on tick over and through the rev range it would be knocking its ***** off the way i drive it 1 Quote Link to comment Share on other sites More sharing options...
Gambit Posted January 23, 2015 Share Posted January 23, 2015 Just get some thicker oil then mate might help just to silents it some more. common thing piston slap even I have it when it's like this in the mornings on cold start :( Quote Link to comment Share on other sites More sharing options...
Ash007ks Posted January 23, 2015 Share Posted January 23, 2015 Piston slap isnt on the down rev though, mine slaps due to them being forged but only on tick over and when warming up, thicker oil in this situation will just turn the engine into a ticking time bomb im afraid, and most likely the outcome will be it will throw the piston . Quote Link to comment Share on other sites More sharing options...
savage bulldogs Posted January 23, 2015 Share Posted January 23, 2015 Knocking bottom ends do tend to get louder under load and (unless caught very early) don't go away when up to temp . Have you checked it's not a pin hole/ minor blow in the exhaust system ? As my slip jointed headers tend to "tick" a bit until they're warm and expand to close the gap . What oil grade/make are you using atm ? As minor piston slap / hydraulic lifter noise can be improved by using a quality oil of the right grade (as gambit said ) But just chucking oil thats to thick will just increase wear (as ash said) 1 Quote Link to comment Share on other sites More sharing options...
Ash007ks Posted January 23, 2015 Share Posted January 23, 2015 As Savage said rule everything else out first :)best way is once its warm, rev it to 3.5k-4k and lev revs drop, if the knocking gets louder on the down rev then its most likely the bottom end. Quote Link to comment Share on other sites More sharing options...
robhull Posted January 23, 2015 Author Share Posted January 23, 2015 The oil I'm using is Shell 10w40 any suggestion for a better oil? not noticed any knocking when off the revs i will have a look at the down pipe next time i is on the ramp think its a cheap stainless steel on Quote Link to comment Share on other sites More sharing options...
Gambit Posted January 23, 2015 Share Posted January 23, 2015 Yeah I didn't mean go for full on treacle :D I use 10W50 in the bugeye and 5W30 in the blobeye so that should be ok as long as it's a good brand. I wouldn't use a Halfords own make I'm sure some people do but for me like most things you get what you pay for. And oil companies spend millions on research I don't think they do that to waste money :) Quote Link to comment Share on other sites More sharing options...
robhull Posted January 23, 2015 Author Share Posted January 23, 2015 Just had a thought when i fitted the clutch the down pipe gasket at the turbo end it was blowing past did not bother replacing it Quote Link to comment Share on other sites More sharing options...
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