Let's discuss Piston Slap...
#1
Scooby Regular
Thread Starter
Join Date: Oct 2004
Location: South London
Posts: 95
Likes: 0
Received 0 Likes
on
0 Posts
![Question](https://www.scoobynet.com/images/icons/icon5.gif)
I'm pretty certain my MY98 has a bad case of piston slap - this year is known to suffer quite badly and Subaru produced modified parts to rectify this. It sounds like a bag of nails when cold, but almost becomes silent when warmed up properly (15 mins+ driving). I haven't had it diagnosed properly but there's not really anything else it could be.
Now I've read a number of threads on ScoobyNet about people having piston slap and then having their big end bearings fail or the engine goes bang or whatever. Other people say they've had this slap for many years and it's never been a problem. So...
What is really going to happen to mine???
It gets driven very hard quite a lot of the time, although not until warmed up
. I change the oil regularly (every 5-7k) with high quality, highly recommended stuff and there is never any metalic deposit on the magnetic sump plug and the oil doesn't seem to be in bad condition with no grittiness to it
. Is there really any serious damage being done?
I look forward to your responses...
Cheers
Ben
![Frown](https://www.scoobynet.com/images/smilies/frown.gif)
Now I've read a number of threads on ScoobyNet about people having piston slap and then having their big end bearings fail or the engine goes bang or whatever. Other people say they've had this slap for many years and it's never been a problem. So...
What is really going to happen to mine???
![Ponder2](https://www.scoobynet.com/images/smilies/ponder2.gif)
![Nono](https://www.scoobynet.com/images/smilies/nono.gif)
![Smile](https://www.scoobynet.com/images/smilies/smile.gif)
I look forward to your responses...
Cheers
Ben
#5
Scooby Regular
Thread Starter
Join Date: Oct 2004
Location: South London
Posts: 95
Likes: 0
Received 0 Likes
on
0 Posts
![Default](https://www.scoobynet.com/images/icons/icon1.gif)
Cheers guys.
So far it would seem that piston slap isn't really an issue. I'm suprised though that nobody has replied saying their engine has packed in due to it.
Are there any pro mechanics out there who could give their opinions?
Ben
So far it would seem that piston slap isn't really an issue. I'm suprised though that nobody has replied saying their engine has packed in due to it.
Are there any pro mechanics out there who could give their opinions?
Ben
#6
![Default](https://www.scoobynet.com/images/icons/icon1.gif)
A good look on search and you will find that the engine people say that as long as the slap goes when hot and not consuming too much oil then the engine is fine. Detailed seach might be better as you are able to specify the forums searched.
Trending Topics
#8
Scooby Regular
![Default](https://www.scoobynet.com/images/icons/icon1.gif)
IMHO piston slap shouldn't have an adverse effect on the big ends, yes it will transfer some vibration down the crank but the piston will be turning slightly at the little end as it is designed to do.. It doesn't do much for the cylinder walls and your rings though
![Smile](https://www.scoobynet.com/images/smilies/smile.gif)
#10
Scooby Regular
Thread Starter
Join Date: Oct 2004
Location: South London
Posts: 95
Likes: 0
Received 0 Likes
on
0 Posts
![Default](https://www.scoobynet.com/images/icons/icon1.gif)
That's exactly what I would have thought Davey. I certainly wouldn't expect NO damage is being done. Mine doesn't use any oil whatsoever, so things shouldn't be too worn yet!
I think I'll start being concerned when it starts using oil.
Cheers
Ben
I think I'll start being concerned when it starts using oil.
Cheers
Ben
#11
Scooby Regular
iTrader: (3)
![Default](https://www.scoobynet.com/images/icons/icon1.gif)
Ive have some slap and until it gives me some real problems then I'll leave it well alone. I understand your concern about spending a couple of K on a new engine but mine gets hammered (Dont read this if I ever advertise it on scoobynet) all the time after a good warm up.
When my MY98 WRX 2.0 goes bang, its 2.5 time!!
When my MY98 WRX 2.0 goes bang, its 2.5 time!!
Thread
Thread Starter
Forum
Replies
Last Post
bluebullet29
General Technical
9
05 October 2015 02:17 PM