New OASIS message for Engine Rattle

[Heretoford]

800ish. The thing that I'm doing different (after reading several break in posts) is drive very easy keeping the rpm's down and the load off until the engine oil gets up to about 190. Then, I will start to drive it harder until the oil is in the 210ish range and the motor is completely warmed up.

Another thing that I am doing (and maybe it doesn't matter) is to occasionally bring the rpm's up to or near 8000 and then ease off on the gas to idle and let the engine wind down to low RPM's on the motors own compression. I've read it has something to do with seating the rings. Other people have commented that technique is bonk and not applicable to this motor. I also widely vary RPM's and I am not afraid to drive along at higher RPM's once the motor is warmed up.

Take it for what it is worth, but that's what I have done.

Thanks Tomster for posting these ideas. couple questions.
1) Do you still have to do all these things to keep the sound at bay? does it come back if you stop them?
2) is there an oil temp you target before running it to 8000 then slowly back to idle?
3) Is the redline maneuver in gear or neutral?

I've also started noticing that sometimes if I start it and just let it sit for 3-4 minutes before driving I won't hear the 'rattle' (albeit its 90+ degrees where I am.) Success is not 100% though.

Thanks again,

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[stanglife]

I'll see if I can make this short

Some alloy expands more than others. The reason slap usually only presents itself when cold is because the piston is smaller in the bore. It's designed so that, at operating temperature, the piston is the "best" size for the bore. The best size, in this case, seems to be a size that will minimize/prevent sticking at high velocity. Unfortunately, it also seems that the best size, in this case, is also just a little small still and allows a little bit of rocking even at normal operating temperature.

I've noticed that after I really get on it a few times, it lessens or even goes away - this tells me that the extra heat from working the engine has put the piston in the sweet spot - this is likely what the car is designed for. They don't want to make it quiet around town but then grow to the point of sticking after a few hard laps). So in a way, it seems better to get this engine a little hotter - or run it harder This could also explain that the sounds goes away/reduces after revving the snot out of it a few times

That's my theory, and I'm sticking with it.

 

[Spa2k]

This could also explain that the sounds goes away/reduces after revving the snot out of it a few times.

It also may be that you're half deaf after cranking it up a few times, so you couldn't hear the piston slap anyway.

 

[montreal ponies]

Mine is stii very present even when fully warm. I only have 450 miles on her, so i'll give it some more time and use [MENTION=21800]Tomster[/MENTION] break in procedures even though i'm not babying the car whatsoever.

 

[Heretoford]

I'll see if I can make this short

Some alloy expands more than others. The reason slap usually only presents itself when cold is because the piston is smaller in the bore. It's designed so that, at operating temperature, the piston is the "best" size for the bore. The best size, in this case, seems to be a size that will minimize/prevent sticking at high velocity. Unfortunately, it also seems that the best size, in this case, is also just a little small still and allows a little bit of rocking even at normal operating temperature.

I've noticed that after I really get on it a few times, it lessens or even goes away - this tells me that the extra heat from working the engine has put the piston in the sweet spot - this is likely what the car is designed for. They don't want to make it quiet around town but then grow to the point of sticking after a few hard laps). So in a way, it seems better to get this engine a little hotter - or run it harder This could also explain that the sounds goes away/reduces after revving the snot out of it a few times

That's my theory, and I'm sticking with it.

I agree! Today I experimented twice with keeping between 4000-6000 for ~ 5-10 mins using 3rd and 4th (probably the two gears you'd use the most at the track) and the 2000-3000 rattle was completely gone afterwards both times. And doing this in sport mode of course sounds amazing -- I almost kept going up to VIR!

 

[Tomster]

Guys, I have no idea why the rattle went away. I've explained the only differences in the way I warm up and drive the vehicle. One post I read said that people who have experience breaking motors in seem to agree to not baby it and to vary the rpms widely. In addition, keep the load and rpms down until the engine oil reaches 190. Albeit, the ambient temperature is warmer now (in the 90's), but I don't think that has much to do with it. The only other thing is that I recently topped the oil up after reading the post on oil consumption. It took about 3/4 of a quart. Another thought is that the Motorcraft 5w50 oil shears over time. Maybe with the way I've been running the motor has some effect on the 5w50 viscosity. I've got a little over 800 miles on it now. I've read not to beat on the motor, but don't baby it. Drive it like it was designed and maybe that will make a difference.

The short of it is I don't know why. I'm passing along what I know.

I'm just blasting off for seattle now (literally rolling down the runway). Best of luck, I'll check back later.

 

[superman07]

On another site several folks were running Amsoil 5-40 as they had tests that shown the Motorcraft oil had sheared to 40 weight after 1k miles anyway. As always research and make your own educated decision. I still use Motorcraft as I have had a dealer do every change and will continue until either I trade this car in, or make the final decision to keep it pending a cooler solution that is acceptable.

 

[montreal ponies]

So, how's everyone dealing with piston slap so far ? Was hoping it'd go away some as i put more mileage on her, but it is still very present and annoying as hell.
I feel like all i hear when cruising in 1st & 2nd gear when leaving home is piston slap , especially when engine is cold.

This is taking away some of the fun i'm having with the car.

Did 1 oil change and put in Amsoil signature series 5W50, but didn't change anything.

 

[firestarter2]

So, how's everyone dealing with piston slap so far ? Was hoping it'd go away some as i put more mileage on her, but it is still very present and annoying as hell.
I feel like all i hear when cruising in 1st & 2nd gear when leaving home is piston slap , especially when engine is cold.

This is taking away some of the fun i'm having with the car.

Did 1 oil change and put in Amsoil signature series 5W50, but didn't change anything.

Put the car in sports mode and drown it out.

I think mine is there even hot just much quieter.

 

[montreal ponies]

Put the car in sports mode and drown it out.

I think mine is there even hot just much quieter.

Whether i'm in sport's mode or not doesn't make any difference since i have to take it easy for about a mile because@ residential area.

Anyway's, my point is i wish it wasn't present. :amen:

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