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bobbber
P4
Joined: 14 May 2003
Posts: 2162
Location: The Greatest Town on Earth - Swadlincote, UK
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 Posted: Thu Apr 08, 2004 4:26 pm Post subject: Piston Slap or valves?! |
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Hi,
I'm convinced my 33IE has one of these problems - how would I tell which!?!?!
Thanks!
Rob
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Fiat Bravo 165 Sport |
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Eddie W
Alfa 33
Joined: 31 Jul 2003
Posts: 375
Location: new zealand
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| Posted: Tue Apr 13, 2004 11:16 am Post subject: |
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Valve clearance noise will be present all the time, piston slap will diminish or disappear when the engine warms up. N
Regards Eddieiether is fatal.
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Eddie W
Alfa 33
Joined: 31 Jul 2003
Posts: 375
Location: new zealand
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| Posted: Tue Apr 13, 2004 11:21 am Post subject: |
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Correction to above: Niether is fatal.
Regards Eddie
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bobbber
P4
Joined: 14 May 2003
Posts: 2162
Location: The Greatest Town on Earth - Swadlincote, UK
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| Posted: Tue Apr 13, 2004 11:31 am Post subject: |
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Phew!
Thanks Eddie... that 'neither is fatal' is worth alot to me! 
I think it's therefore piston slap, as it does it for a while then goes away... tick tick tick!!!
Do you think using some 15W/50 might be a good idea!?!?!?
It's got 115k on the clock now.
Thanks!
Rob
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Fiat Bravo 165 Sport |
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Serpent33
Alfa Sprint
Joined: 06 May 2003
Posts: 210
Location: Singapore
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| Posted: Wed Apr 14, 2004 5:04 pm Post subject: |
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| Eddie W wrote: |
Valve clearance noise will be present all the time, piston slap will diminish or disappear when the engine warms up. N
Regards Eddieiether is fatal. |
It normally takes few seconds to go off. If too long, try another grade of oil.
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Each time I speed I say, "Dear lord, make me fast and accurate..." |
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Guest
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| Posted: Thu Apr 15, 2004 9:36 am Post subject: |
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A higher viscocity?!?!?
I'm gonna try some 15W/50 this weekend... I'll let you know what happens! 
Can always take it out if it makes things worse and put 10W/40 back in.
Cheerz folks,
Rob |
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Serpent33
Alfa Sprint
Joined: 06 May 2003
Posts: 210
Location: Singapore
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| Posted: Thu Apr 15, 2004 9:50 am Post subject: |
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| Anonymous wrote: |
A higher viscocity?!?!?
I'm gonna try some 15W/50 this weekend... I'll let you know what happens!
Can always take it out if it makes things worse and put 10W/40 back in.
Cheerz folks,
Rob |
How about lower 'low temp' viscosity? Since it might be a sign that your oil is too thick when cold.
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bobbber
P4
Joined: 14 May 2003
Posts: 2162
Location: The Greatest Town on Earth - Swadlincote, UK
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| Posted: Thu Apr 15, 2004 1:24 pm Post subject: |
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Hmmm.... Like 5W/50....
OK!
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Sergio
Alfa Sprint
Joined: 13 Mar 2003
Posts: 150
Location: Portugal
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| Posted: Thu May 06, 2004 7:53 pm Post subject: |
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just a dumb question..... 
What is Piston Slap?
All the best
Sérgio |
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lesthegringo
Alfasud
Joined: 23 Jul 2003
Posts: 97
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| Posted: Sun May 09, 2004 6:03 pm Post subject: Piston Slap |
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Piston slap is where the piston doesn't go straight up and down the bore completely parallel to the bore face. The piston 'shimmies' up and down, with the piston twisting very slightly around the axis of the piston pin as the forces work on it. The piston skirt just touches the bore and generates noise.
It generally happens more with worn engines, where there is more clearance
Les |
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Piston Punisher sussex uk
Guest
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| Posted: Sun May 09, 2004 10:33 pm Post subject: Piston Slap |
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hi all,
The last reply is correct in description-i know about that because i like to punish pistons!
Pistin slap is very common with small 2-stroke engines that have been thrashed.I have not really experienced it on a 4-stroke as far as i can remember.I think valve clearance noise sounds more vairious with its taps and rattles all mixed up.But piston slap is more repetative and predictable with its noise.
Your high milage does not spell big problems,my 1.716v has done 131,000 miles and still sounds sweet. |
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