Piston Slap
15 April 2006, 08:05 PM
#31
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mine knocks at idle when cold and warm,worse when cold! goes totally under load or anything above 2,000 revs.. have been told its piston slap by a garage.. first sounded like an end to me but that wouldnt disappear like this does..clueless but going to take it to extreme scoobies see what they say
15 April 2006, 08:06 PM
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mine knocks at idle when cold and warm,worse when cold! goes totally under load or anything above 2,000 revs.. have been told its piston slap by a garage.. first sounded like an end to me but that wouldnt disappear like this does..clueless but going to take it to extreme scoobies see what they say thats a 93 classic jdm
15 April 2006, 08:24 PM
#33
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Originally Posted by robsw
Yes I heard '98 cars also, whether there is any deviation on this I am not sure.
Apparently it is due to the piston diameter being slightly too large for the bore, and as a result the piston ovalised upon usage causing piston slap as a design error. Although I stand to be corrected.
Robin.
Apparently it is due to the piston diameter being slightly too large for the bore, and as a result the piston ovalised upon usage causing piston slap as a design error. Although I stand to be corrected.
Robin.
It's the bore that is larger than the piston, resulting in it slapping
on the sides, when it gets hot the piston/ring expands creating a tighter
fit.
Rob
16 April 2006, 11:25 AM
#34
Originally Posted by chris25uk
mine knocks at idle when cold and warm,worse when cold! goes totally under load or anything above 2,000 revs.. have been told its piston slap by a garage.. first sounded like an end to me but that wouldnt disappear like this does..clueless but going to take it to extreme scoobies see what they say thats a 93 classic jdm
JohnD (old fella from Romford!)
16 April 2006, 11:45 AM
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What is the cambelt pre-tensioner noise? I just had mine serviced and they said it was leaking and is due to be replaced.
However for the past couple of weeks prior to the service I have noticed a tapping noise when accelerating from 1000RPMS to 3000RPMS. Sounds like tappets or a slight fluttery noise.
Is this a pre-tensioner leaking noise compared to piston slap?
Cheers
However for the past couple of weeks prior to the service I have noticed a tapping noise when accelerating from 1000RPMS to 3000RPMS. Sounds like tappets or a slight fluttery noise.
Is this a pre-tensioner leaking noise compared to piston slap?
Cheers
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