370Z Piston Slap

Joebarchuck · 08-16-2010, 03:54 PM

Hi guys,

My 370Z now has about 350 miles on it and I am hearing what I think is a piston slap noise when the car is going up hills especially when in neutral while waiting for the gate to open.

I am not 100% sure it is a piston slap problem but it sounds like it or similar to it. What else could it be?

That has me worried because I am scheduled for lots of changes tomorrow as I am driving to the Stillen shop in Costa Mesa. I would not want the Nissan Dealer to tell me it's because of the changes I made that it's happening even though it is happening before any changes.

Anyone has a clue about what the noise could be?

SoCal 370Z · 08-16-2010, 04:02 PM

What grade and brand of fuel are you running?

WarmAndSCSI · 08-16-2010, 04:06 PM

Sounds like valvetrain noise.

Piston slap on Japanese engines only occurs with loose-clearance pistons like aftermarket 2618 alloy pistons for force fed applications, and only while cold. You're definitely not hearing piston slap, but it could be coming from that relative area.

Joebarchuck · 08-16-2010, 05:10 PM

Quote:

Originally Posted by SoCal 370Z

What grade and brand of fuel are you running?

I've only filled the tank once and it was a Chevron station the gas was 91 grade premium as I always put in my 350Z.

Joebarchuck · 08-16-2010, 05:12 PM

Quote:

Originally Posted by WarmAndSCSI

Sounds like valvetrain noise.

Piston slap on Japanese engines only occurs with loose-clearance pistons like aftermarket 2618 alloy pistons for force fed applications, and only while cold. You're definitely not hearing piston slap, but it could be coming from that relative area.

Thanks for the infos, I will look that up and maybe go to a dealer. Again the noise really only happens on a hot engine and is audible when in neutral in an uphill position. (While waiting for the gate to open).

My question is should I reschedule with Stillen or not?

ChrisSlicks · 08-16-2010, 05:47 PM

Quote:

Originally Posted by Joebarchuck

Thanks for the infos, I will look that up and maybe go to a dealer. Again the noise really only happens on a hot engine and is audible when in neutral in an uphill position. (While waiting for the gate to open).

My question is should I reschedule with Stillen or not?

You sure it isn't the clutch rattle? That is pretty loud out of gear with the clutch out, clutch in it goes away.

Joebarchuck · 08-16-2010, 06:07 PM

Quote:

Originally Posted by ChrisSlicks

You sure it isn't the clutch rattle? That is pretty loud out of gear with the clutch out, clutch in it goes away.

Ah, I did not think about that. I went out of the car to try to identify where the noise comes from but it's tough... To me it sounds like it comes from the engine but something from the clutch would from the outside also seem to come from the engine.

I guess that could be a good guess.

ChrisSlicks · 08-16-2010, 06:14 PM

Quote:

Originally Posted by Joebarchuck

Ah, I did not think about that. I went out of the car to try to identify where the noise comes from but it's tough... To me it sounds like it comes from the engine but something from the clutch would from the outside also seem to come from the engine.

I guess that could be a good guess.

It's easy to test. Stick your foot on the clutch, if it goes away that is what it is.

Joebarchuck · 08-16-2010, 06:21 PM

I'll try that tonight.

6MT · 08-16-2010, 10:36 PM

Check your oil.

Zaggeron · 08-16-2010, 10:39 PM

Definitely diagnose the noise before bolting on aftermarket parts -- if you've got a problem (and you probably don't), then you could be in for trouble with mods.

fullmonty · 08-16-2010, 11:45 PM

Quote:

Originally Posted by Zaggeron

Definitely diagnose the noise before bolting on aftermarket parts -- if you've got a problem (and you probably don't), then you could be in for trouble with mods.

Get the issue straightened out then go for the mods

08-16-2010, 03:54 PM	#1 (permalink)
Joebarchuck Base Member Join Date: Aug 2010 Location: Los Angeles Posts: 202 Drives: 2010 370Z Roadster Rep Power: 15	370Z Piston Slap Hi guys, My 370Z now has about 350 miles on it and I am hearing what I think is a piston slap noise when the car is going up hills especially when in neutral while waiting for the gate to open. I am not 100% sure it is a piston slap problem but it sounds like it or similar to it. What else could it be? That has me worried because I am scheduled for lots of changes tomorrow as I am driving to the Stillen shop in Costa Mesa. I would not want the Nissan Dealer to tell me it's because of the changes I made that it's happening even though it is happening before any changes. Anyone has a clue about what the noise could be? __________________ Red 2010 370Z Roadster: Stillen G3, Stillen Exhaust, Up-Rev Tune (312 RWHP), Eibach Pro Springs, 20mm spacers front and back, Rear Camber Kit, Tinted Windows, GT-R Start Button, Interior Mods

08-16-2010, 04:02 PM	#2 (permalink)
SoCal 370Z A True Z Fanatic Join Date: Feb 2009 Location: US of A Posts: 2,842 Drives: Answers Rep Power: 34	What grade and brand of fuel are you running? __________________ ( Click to show/hide ) Why I NEVER say NO to the Panda Lou Fusz!!!

08-16-2010, 04:06 PM	#3 (permalink)
WarmAndSCSI A True Z Fanatic Join Date: May 2010 Location: SLC, UT Posts: 1,671 Drives: '08 Evo X \| '10 370Z Rep Power: 18	Sounds like valvetrain noise. Piston slap on Japanese engines only occurs with loose-clearance pistons like aftermarket 2618 alloy pistons for force fed applications, and only while cold. You're definitely not hearing piston slap, but it could be coming from that relative area. __________________ '10 PW 370Z 7AT - wife's car - Project Raspberry Cheesecake '08 Evo X - built motor+trans \| BB-X @ 32 psi \| CH3OH \| self-built+tuned - ??? WHP '01 Galant V6 - built motor \| GT35R \| self-built+tuned - 550+ WHP (retired)

08-16-2010, 06:21 PM	#9 (permalink)
Joebarchuck Base Member Join Date: Aug 2010 Location: Los Angeles Posts: 202 Drives: 2010 370Z Roadster Rep Power: 15	I'll try that tonight. __________________ Red 2010 370Z Roadster: Stillen G3, Stillen Exhaust, Up-Rev Tune (312 RWHP), Eibach Pro Springs, 20mm spacers front and back, Rear Camber Kit, Tinted Windows, GT-R Start Button, Interior Mods

08-16-2010, 10:36 PM	#10 (permalink)
6MT A True Z Fanatic Join Date: May 2009 Location: ITU Zone 2 Posts: 22,459 Drives: Reliant Robin Rep Power: 1790	Check your oil. __________________ Andrew 2009 370Z Sport/Touring 6MT sold 2013 Honda Civic Si coupe D/D

08-16-2010, 10:39 PM	#11 (permalink)
Zaggeron A True Z Fanatic Join Date: Jan 2010 Location: Austin, TX Posts: 1,951 Drives: '10 370ZR '13 BRZ Rep Power: 19	Definitely diagnose the noise before bolting on aftermarket parts -- if you've got a problem (and you probably don't), then you could be in for trouble with mods. __________________ 2010 Platinum Graphite 370z Roadster:Touring/Sport 2013 Subaru BRZ Limited

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