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Old 09-16-2007, 10:13 PM   #1
kharris4
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Default Piston Slap Questions.

i just had my new motor tuned and have been driving the car alot more to get used to it. now i'm lsitening to what i believe to be the pistons ticking on cold start ups. i does go away once the car warms up.

- is it safe to drive before the ticking stops?

- does driving help the ticking stop?

- is there a temperature that one might wait to see before driving with a built motor? i usually wait until i see about 100 F on my coolant gage. then i baby it around the block untill i hit the first stop light. it's usually warm by then.

i quess i'm really looking for safe warm up practices when i leave to go to work in the morning.
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Old 09-16-2007, 10:32 PM   #2
SkyRealms
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Although I am no authority, I generally notice that my piston slap starts to muffle at about 120 F and generally disappears before 160 F.

It sounds to me like your warm-up practices are sufficient. My practice is also quite similar.
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Old 09-16-2007, 10:48 PM   #3
kharris4
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it seems that mine is alot like yours. it takes longer if i just let it sit there and idle though.
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Old 09-17-2007, 08:08 PM   #4
flycaster
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Try and keep it below 3K until the engine is thoroughly warmed up - don't lug it, but don't rev the crap out it either. A 100f water temp is not warmed up. If you have no oil temp guage, a good rule of thumb is to wait twice as long as it takes the water temp to hit its normal mark before you hop on it. So, if it takes, say, 3 minutes to get the water up to snuff, figure about 6 minutes of driving before you go for it. You gotta get the oil nice and warm, and the engine evenly warmed up - the water temp guage can't tell you this, especially if the block is stone cold.

Last edited by flycaster; 09-17-2007 at 08:17 PM.
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Old 09-17-2007, 09:53 PM   #5
kharris4
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that's some good info. i'm pretty close to what you're talking about, however, i'm going to lengthen my warm-up time a little.

i can't believe this question isn't asked more often.
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Old 09-18-2007, 02:54 AM   #6
SubaruImpreza_power
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The lack of skirts or on some the very short skirts of the pistons is what causes some of the slap you hear and like flycaster said keep it under 3K for me in the winter I keep it under 3K for about 10 min.

Also for a older car like I had a 95 Impreza L with a 1.8L it took forever for the 4EAT to get any heat to shift out of 3rd.. I would notice it would hold the car in 3rd gear on the highway until the fluid was warm enough.
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Old 09-18-2007, 02:17 PM   #7
flycaster
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Quote:
Originally Posted by SubaruImpreza_power View Post
...in the winter I keep it under 3K for about 10 min...
Yep, when there's snow on the ground and the block is starting out from 10f or less, it takes a loooong time to warm up the motor, not to mention the tranny.
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Old 09-18-2007, 04:23 PM   #8
SubaruImpreza_power
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yeah.. I will find out this year if not early next when I buy which ever impreza I will but with a MT.. I guess care should be taken the same was as the A/T

Is the car harder to shift when it's very cold out?
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Old 09-18-2007, 04:54 PM   #9
kharris4
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mine is a little harder to shift when it's cold out. i have the JDM 6-speed.
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Old 09-18-2007, 05:59 PM   #10
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Quote:
Originally Posted by SubaruImpreza_power View Post
Is the car harder to shift when it's very cold out?
You betcha. But, let's face it, nothing works really well until it is warmed up...including us.
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Old 09-18-2007, 06:55 PM   #11
SubaruImpreza_power
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Quote:
Originally Posted by flycaster View Post
You betcha. But, let's face it, nothing works really well until it is warmed up...including us.

LOL so true.. I remember the windchill was -24F one morning and having to clear the windows on the car.. boy was I moving slow.

I sure as hell wont lie I miss my Subies lol I got rid of the Forester I blew the front diff on that for not tending to the leaking oil seal and it went dry while driving.. in a nutshell.. heard a sound like a bad wheel bearing.. got louder and louder and at the next light maybe only 10% throttle Boom! it broke and it was a stock 03 fXs haha.

Really up in the air what I want.. STI is nice but don't like the weight.. I'd get an older GC but then I'd have to pay like $15-20K to swap in the whole driveline..
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