BBQ Tick Fix

[Andy13186]

If the noise is coming from the bottom end, its not piston slap. Piston slap goes away when engine warmed up as well.

Pistons are in the bottom end... and part of the shortblock.. below the cylinder heads intake manifold , above the plastic pan...

What do you think the noise would be?

Heres another video of mine with some revving noise starts like a minute in



And yes I think we have both stated it goes away when warm. mine does.. Mine did seem to change a bit with turning the AC Off, but I think thats because AC causes a light load on the engine.. You can hear it go away when i turn the AC off but then it comes back when i give it very light throttle, then I turn AC back on and it comes back at idle.

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[Ghost50]

Pistons are in the bottom end... and part of the shortblock.. below the cylinder heads intake manifold , above the plastic pan...

What do you think the noise would be?

Heres another video of mine with some revving noise starts like a minute in



And yes I think we have both stated it goes away when warm. mine does.. Mine did seem to change a bit with turning the AC Off, but I think thats because AC causes a light load on the engine.. You can hear it go away when i turn the AC off but then it comes back when i give it very light throttle, then I turn AC back on and it comes back at idle.

Yep same for me.

I’m going to time it tomorrow morning and see how long it takes for it to subside.

 

[Andy13186]

Heres another article I read that made me think its piston slap since this new engine has no sleeves on the cylinders just the coating on the aluminum block, and also very light short skirted pistons. : http://blog.jepistons.com/what-is-piston-slap-false-knock

Piston Slap Explained

“Piston slap is generally caused when the cold running clearance (piston-to-wall clearance) is large enough that when the piston rocks from side to side in the bore it “slaps” the side of the cylinder and causes noise,” explains JE Pistons’ Clayton Stothers. In the case of the LS, the shorter piston skirt meant that the angular shift of the piston in the bore was more pronounced than with a longer piston running the same clearance. To make matters worse, that clearance couldn’t be tightened due to the fact that even with cast-in iron sleeves, the early, aluminum LS block wasn’t as dimensionally stable as an all-iron small block Chevy.

Though the LS1 is one of the best known examples of factory engines known for piston slap, it’s a common issue for many other high performance designs. Per Stothers, “Certain block designs will transmit the noise much easier than other blocks, and newer aluminum blocks are particularly susceptible. One that comes to mind for me is the VR38DETT Nissan GT-R engine. It is an aluminum block with a very thin (0.15mm) plasma-sprayed steel liner so it tends to expand at a similar rate to the piston. This would cause piston noise because the cold clearance would never really tighten up, even at operating temperature.”

Because aluminum expands as it gets hot, and pistons see tremendous heat from combustion, they need to be machiend slightly smaller than the bore. This can, with 2618 alloys, cause them to make some noise when the engine is cold.
In high performance aftermarket applications, piston slap can also become prominent. JE Pistons recommends an additional 0.001 to 0.003 inch additional piston-to-bore clearance for supercharged, turbo, nitrous, and endurance engines, which can make for more noise on startup especially when combined with the wider tolerance required for high performance forged 2618 alloy slugs. “We need to provide more clearance for 2618 since it expands more than other alloys,” Stothers explains. “Also, high power engine builders need to provide more clearance to account for their power level so that also adds to the noise.”"

 

[stangman638]

Pistons are in the bottom end... and part of the shortblock.. below the cylinder heads intake manifold , above the plastic pan...

What do you think the noise would be?

Heres another video of mine with some revving noise starts like a minute in



And yes I think we have both stated it goes away when warm. mine does.. Mine did seem to change a bit with turning the AC Off, but I think thats because AC causes a light load on the engine.. You can hear it go away when i turn the AC off but then it comes back when i give it very light throttle, then I turn AC back on and it comes back at idle.

If piston slaps it would not sound like it's coming from oil pan area.. or bottom end in general, slap is heard from top.

 

[stangman638]

When I bring it a motorsports shop in week and half, I'll post more what he says after he puts a stethoscope on it.

 

[Zinc03svt]

If you research the barbque tick on Gen 1 coyotes it was a very loud intermitten sound that occurred on up to temp engines. Way louded than any of this cold start clicking/ticking. This 18 up sound can be heard lower (behind front tire) and upper engine with hood up on cold start. Again, stop obsessing over warm up engine noises and give your car time to come up to temp before hammering on it.

 

[Andy13186]

If piston slaps it would not sound like it's coming from oil pan area.. or bottom end in general, slap is heard from top.

Piston slap comes from the pistons slapping the block..............

Dealer said they agree with me on it being piston slap but may consider mine excessive. They may tear it down idk what to do. They are backed up 3 weeks though so ill be driving it until then. Damn i wanted to tune this thing but have been holding off.

 

[stangman638]

Piston slap comes from the pistons slapping the block..............

Dealer said they agree with me on it being piston slap but may consider mine excessive. They may tear it down idk what to do. They are backed up 3 weeks though so ill be driving it until then. Damn i wanted to tune this thing but have been holding off.

Could be, I have scene a few different videos and some seem to have different ticks all together.

I'm not sure I should post this here, but I through on a catch can I have today for fun and ran around with it in sport mode to get some high rpm revs in there, got home and found a bit more oil than I would have expected for a few miles along with some very very fine metal, was hard to see the metal flakes, but it was there.

 

[Andy13186]

Could be, I have scene a few different videos and some seem to have different ticks all together.

I'm not sure I should post this here, but I through on a catch can I have today for fun and ran around with it in sport mode to get some high rpm revs in there, got home and found a bit more oil than I would have expected for a few miles along with some very very fine metal, was hard to see the metal flakes, but it was there.

I have a catch can on my mustang too too, very little oil in mine maybe .5 oz total in 1.5k miles. My CTS-V which ran great caught a shit-ton more it was 630rwhp supercharged with 90k miles though. That V caught about 12 oz of oil per 5k miles, thats like a solid 2+ oz per 1k miles and it seemed to run great.

The V had a moroso catch can which may catch more though, IDK if the amount was because of the catch can design being better or just less blowby on the Mustang. Running the JLT 3.0 on my mustang.

 

[stangman638]

I have a catch can on my mustang too too, very little oil in mine maybe .5 oz total in 1.5k miles. My CTS-V which ran great caught a shit-ton more it was 630rwhp supercharged with 90k miles though. That V caught about 12 oz of oil per 5k miles, thats like a solid 2+ oz per 1k miles and it seemed to run great.

The V had a moroso catch can which may catch more though, IDK if the amount was because of the catch can design being better or just less blowby on the Mustang. Running the JLT 3.0 on my mustang.

Have the same JLT, I probably had a teaspoon or 2 from a drive around the block damn near,.. Will leave it on and watch it over the weekend. I actually took it off as the tick developed just to see, hasn't been on in a few weeks, but I never seen this much from a drive around the block, more so after 2-3 weeks worth.

 

[Zinc03svt]

Could be, I have scene a few different videos and some seem to have different ticks all together.

I'm not sure I should post this here, but I through on a catch can I have today for fun and ran around with it in sport mode to get some high rpm revs in there, got home and found a bit more oil than I would have expected for a few miles along with some very very fine metal, was hard to see the metal flakes, but it was there.

If you have metal flecks in your catch can for just a couple drives your oil pan and filter must be full of metal shavings... Lol. Again, I highly doubt that. WTF?

 

[stangman638]

If you have metal flecks in your catch can for just a couple drives your oil pan and filter must be full of metal shavings... Lol. Again, I highly doubt that. WTF?

Engines gonna explodez any day now LOL

 

[Andy13186]

Guy had his car in the shop for the tapping for 4 weeks, they replaced cam phasers and it still taps :





Still thinking piston slap prob since they didnt change his shortblock. And I still think piston slap may just be a normal characteristic of an unsleeved aluminum block with shirt skirted pistons.. but mine may be excessive. not sure really. Guess ill let them bore scope mine in 3 weeks when they are available.

 

[stangman638]

Guy had his car in the shop for the tapping for 4 weeks, they replaced cam phasers and it still taps :






Still thinking piston slap prob since they didnt change his shortblock. And I still think piston slap may just be a normal characteristic of an unsleeved aluminum block with shirt skirted pistons.. but mine may be excessive. not sure really. Guess ill let them bore scope mine in 3 weeks when they are available.

Because it's not the phasers causing it. Troubleshooting is the most difficult part of a mechanics job which most aren't very good at. Anyone can change parts or throw parts at engine. I'm taking my car to one of the best Ford and Chevy racing mechanic in the northeast and seeing what he finds.

 

[Zinc03svt]

I have run a few cycles on this Pennzoil Ultra Platinum and the cold start ticks/clicks are gone.

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