Another oil consumption thread

ANGREY

Well-Known Member
Established Member
Joined
Oct 24, 2017
Messages
553
Its a good discussion and important to try and figure this stuff out.

In theory, that makes sense. Question is do you ever hear piston slap? Ive not heard any 350 owners reporting that problem.

Also, the amount of swelling the piston would have to experience to make this logical would be so much, you could actually see the difference in piston size cold vs. warm. That in and of itelf would present a ton of other issues. Even a motor with cold start piston slap is going to have a piston damn near perfectly perpendicular to the combustion chamber once it reaches TDC.

To test the theory, we can look to an engine design with known piston slap issues are the early Chevy LS motors. Wife's 6.0 suburban slaps every morning for a minute or two as it warms up. This motor has 192k miles and uses about 1/2 quart of 5w30 between 5000 mile oil changes.

One of the guys who's motor blew and he was tearing it down showed evidence of piston slap (youtube vid) and I've heard a couple of other guys in forums claim they have it. I have not yet heard.

I don't think we're talking about huge dimension here. If the piston isn't perfectly centered and level in the bore, even a miniscule amount would change the ring contact with the wall (that's the bitch of a circular contact, tilt it even slightly in any direction and you now don't have perfect contact anymore or at least not the contact the ring seated/wore to when it's operating normally.
 

gimmie11s

I Race Pontiacs
Established Member
Premium Member
Joined
Jun 1, 2004
Messages
18,488
Location
la la land
One of the guys who's motor blew and he was tearing it down showed evidence of piston slap (youtube vid) and I've heard a couple of other guys in forums claim they have it. I have not yet heard.

I don't think we're talking about huge dimension here. If the piston isn't perfectly centered and level in the bore, even a miniscule amount would change the ring contact with the wall (that's the bitch of a circular contact, tilt it even slightly in any direction and you now don't have perfect contact anymore or at least not the contact the ring seated/wore to when it's operating normally.

Could be. It's interesting to think about thats for sure.
 

WVTrakPak

Well-Known Member
Established Member
Joined
Sep 22, 2014
Messages
488
Location
WV
I do believe that some 350s have piston slap but I dont think it is a large number. I also am careful about warm up and oil temps. First learned about the warm up with my 911 and have been very careful.

This is just my opinion but, I also think that babying these cars and then flogging them is not good. I could be very wrong on this but I want my rings to seat in at the maximum twist I am gonna put on it. I plan on putting a bunch of miles on it this year because if it is gonna have issues i want it to have them now. I also am not gonna own a car that I am afraid to wind up.
 

ANGREY

Well-Known Member
Established Member
Joined
Oct 24, 2017
Messages
553
Its a good discussion and important to try and figure this stuff out.

In theory, that makes sense. Question is do you ever hear piston slap? Ive not heard any 350 owners reporting that problem.

Also, the amount of swelling the piston would have to experience to make this logical would be so much, you could actually see the difference in piston size cold vs. warm. That in and of itelf would present a ton of other issues. Even a motor with cold start piston slap is going to have a piston damn near perfectly perpendicular to the combustion chamber once it reaches TDC.

To test the theory, we can look to an engine design with known piston slap issues; the early Chevy LS motors. Wife's 6.0 suburban slaps every morning for a minute or two as it warms up. This motor has 192k miles and uses about 1/2 quart of 5w30 between 5000 mile oil changes which is basically nothing. In all likelihood that 1/2 quart is due to valve guide wear more so than ring wear.

There's a vid of a guy who broke down is motor and it had evidence of slap in a couple of cylinders (on the piston skirts). Additionally, there have been a couple of discussions with guys who claim they can hear it.
 

AustinSN

Well-Known Member
Established Member
Beer Money Bros.
Joined
Jan 29, 2014
Messages
6,408
Location
the plains
My car does have piston slap, and it does burn about .5 qt per 1500 miles.

Track time doesn't seem to increase that number. 240 miles on track in a weekend and there is no noticeable difference.

One of the interesting things I've noticed, is some guys on the forums have had valve seal issues, so some of these may be related to that.
 

07 Black Beauty

Well-Known Member
Established Member
Joined
Jan 30, 2011
Messages
2,377
Location
Florida
Change to the change... they want me to do 2 more consumption tests before swapping my motor.

In their defense these motors aren't cheap. It sucks to have to jump through some hoops, but in the end if they replace the motor it'll been worth it. From what I've seen on the forums they aren't denying too many replacements unless you've modded the car.
 

tomshep

Another R Addict
Established Member
Joined
Feb 9, 2003
Messages
4,372
Location
Republic of Texas
Has anyone had a REPLACEMENT motor burn oil? This would indicate if they may have a handle on it with the newer production motor.

Tom
 

biminiLX

never stock
Established Member
Premium Member
Joined
Jan 17, 2003
Messages
13,253
Location
Toledo, OH
Has anyone had a REPLACEMENT motor burn oil? This would indicate if they may have a handle on it with the newer production motor.

Tom
Good question. We do know the late 2018s and 2019s have the updated 5.2 block shared with the next GT500.
-J
 

Mwynn

Active Member
Established Member
Joined
Nov 5, 2012
Messages
205
Location
GA
Good question. We do know the late 2018s and 2019s have the updated 5.2 block shared with the next GT500.
-J
So... how does one tell if they have an updated block in the late builds of 2018?
 

1FASFKR

Active Member
Established Member
Joined
Jun 15, 2013
Messages
466
Location
Texas
So... how does one tell if they have an updated block in the late builds of 2018?

Pop off the plastic coil cover on the driver side. Read the sticker for a JA or HA. HA is a 17 block. JA is an 18 block. I would assume the 19 block will have a KA. I seriously doubt any 18 blocks will have the KA but I know for a fact that there are HA and JA blocks in the model 18 production.
 

Attachments

  • R20.jpg
    R20.jpg
    317.6 KB · Views: 367

Mwynn

Active Member
Established Member
Joined
Nov 5, 2012
Messages
205
Location
GA
Pop off the plastic coil cover on the driver side. Read the sticker for a JA or HA. HA is a 17 block. JA is an 18 block. I would assume the 19 block will have a KA. I seriously doubt any 18 blocks will have the KA but I know for a fact that there are HA and JA blocks in the model 18 production.
Well.... I got 18 350R #581 with a HA code on the sticker, guess I do not have an updated block.
 

biminiLX

never stock
Established Member
Premium Member
Joined
Jan 17, 2003
Messages
13,253
Location
Toledo, OH
When was it built?
I have a suspicion that as they changed the block they changed something else internally, either hone or ring pack or...?
Maybe someday we’ll know
-J
 

1FASFKR

Active Member
Established Member
Joined
Jun 15, 2013
Messages
466
Location
Texas
Well.... I got 18 350R #581 with a HA code on the sticker, guess I do not have an updated block.

That's interesting. My 18R is #369 built 4/18. My buddy has an 18 R #560 and said his a JA block but I haven't seen a pic. Either way, there isn't an "updated" block from model year 17 to 18. They are the same. There is updated pistons and ring packs for model year 18 tho to alleviate oil issues. Not sure when they were implemeted. Some early 18's may not have gotten the piston ring packs.
 
Last edited:

biminiLX

never stock
Established Member
Premium Member
Joined
Jan 17, 2003
Messages
13,253
Location
Toledo, OH
Well there’s an updated 5.2 block for the 500 that they said is now used in the 350. Just makes sense. I wonder if the Ford Racing 5.2 block will be the same? I’d guess yes.
-J
 

1FASFKR

Active Member
Established Member
Joined
Jun 15, 2013
Messages
466
Location
Texas
Well there’s an updated 5.2 block for the 500 that they said is now used in the 350. Just makes sense. I wonder if the Ford Racing 5.2 block will be the same? I’d guess yes.
-J

Agreed, there is an upgraded/updated block starting for MY 19. Changes to the block are specifically for the FI. Longer heads bolts, etc.
 

IamRacerX

No brand loyalty rhetoric here.
Established Member
Joined
Jul 27, 2009
Messages
2,334
Location
FL
So can anyone confirm if the updated piston/block set up in the late ‘18 up in fact does not use excess oil?
I spoke to a Ford tech 3 months ago while my airbags were replaced and he said the Voodoo uses oil, no way around it. They avg 0.5-1.0 quart burned per 1k miles... with some worse.
 

gjcavana

New Member
Established Member
Joined
Aug 7, 2017
Messages
26
Location
Ankeny, Iowa
So can anyone confirm if the updated piston/block set up in the late ‘18 up in fact does not use excess oil?
I spoke to a Ford tech 3 months ago while my airbags were replaced and he said the Voodoo uses oil, no way around it. They avg 0.5-1.0 quart burned per 1k miles... with some worse.

I don't think Ford considers 1qt every 1k normal or acceptable. I was burning a little more than 1qt every 1k miles on my '17 and ford is replacing the engine. Should get it back next week.
 

Users who are viewing this thread



Top