Cause for piston slap?
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PassionFord Regular
Joined: Apr 2008
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From: Perth W.A.
Cause for piston slap?
http://www.bluecossie.com/index.php?...d=62&Itemid=25
I thought piston slap was something a bit different
I thought piston slap was something a bit different
C**t
Joined: Oct 2003
Posts: 7,998
Likes: 269
From: Norn Iron
http://www.bluecossie.com/index.php?...d=62&Itemid=25
I thought piston slap was something a bit different
I thought piston slap was something a bit different
Confused?
What he is saying is correct, hence the 4x4 were redesigned with different style gudgeon pins.
And for your information the owner of that site is a member on this site.
Martin
What he is saying is correct, hence the 4x4 were redesigned with different style gudgeon pins.
And for your information the owner of that site is a member on this site.
Martin
C**t
Joined: Oct 2003
Posts: 7,998
Likes: 269
From: Norn Iron
The diesel type noise is known as piston slap. It comes from cold oil being churned by the crank, and slapping against the bottom of the pistons.
2WD's are renowed for this issue as I say, and it does sound a bit like a derv.
The actual reason is the design of the gudgeon pin, so ok, his explanation is incorrect but he gets the point across, nevertheless!
Martin
The actual reason is the design of the gudgeon pin, so ok, his explanation is incorrect but he gets the point across, nevertheless!
Martin
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Too many posts.. I need a life!!
Joined: May 2003
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From: Lancashire
You get piston slap on 2WD engines is because the gudgeon pin is located centrally and the piston 'rocks' until it warms up and expands. A central location is desirable on a high revving engine hence why Cosworth built it this way.
4x4 engines were changed as the Motorsport requirement was no longer there hence the offset gudgeon pin to reduce piston slap.
The slap doesn't cause any harm and is actually mentioned in the Owner's Handbook.
He's not correct though in what he's written. Oil slapping the pistons indeed
You get piston slap on 2WD engines is because the gudgeon pin is located centrally and the piston 'rocks' until it warms up and expands. A central location is desirable on a high revving engine hence why Cosworth built it this way.
4x4 engines were changed as the Motorsport requirement was no longer there hence the offset gudgeon pin to reduce piston slap.
The slap doesn't cause any harm and is actually mentioned in the Owner's Handbook.
You get piston slap on 2WD engines is because the gudgeon pin is located centrally and the piston 'rocks' until it warms up and expands. A central location is desirable on a high revving engine hence why Cosworth built it this way.
4x4 engines were changed as the Motorsport requirement was no longer there hence the offset gudgeon pin to reduce piston slap.
The slap doesn't cause any harm and is actually mentioned in the Owner's Handbook.
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