manitou202

I don't want to beat a dead horse, but considering the new 4.0L will have a rigid valve train instead of hydraulic lifters, do you think that a different approach to breaking in the engine is necessary? Or do the same theories apply as before.

Kobalt

I think it is the same.

I believe that if you change the heads on 991.1 GT3 there is no break in ->
So the break in might not apply very much to the heads.

neanicu

Same.

https://rennlist.com/forums/991-gt3-...e-s-mouth.html

bronson7

Thank you for posting that thread again. A good read.

JCtx

What wasn't mentioned was valve clearance checks. There HAS to be checks, as no rigid valvetrain would keep clearance for 100K miles. Similarly, there's no such thing as 'lifetime fluid' IMO, like Porsche also claims for the PDK, so who knows.

GrantG

Porsche is actually claiming 186k mile clearances without adjustment (and any adjustments free of charge for life, if ever needed). Will be interesting to see real-world results...

thebishman

I'm wondering if the free 10K mile service is to check valve clearances, etc.
Bish

GrantG

That is probably a fairly big job (not sure if you can easily pull the valve covers and physically check the clearances without pulling the motor on the new cars - fairly easy on the older air-cooled cars with better access).

I am guessing/hoping that the modern ECU OBD code might be triggered if things get out of whack without having to perform surgery to know if there is an issue.

Just in time

186k miles! Wow, Porsche must have hit the mother lode when it comes to metallurgy.

RealityGT

If I can get 186k Miles out of the motor.. I will gladly pay for maintenance..

mass27

Great article. Although, if you read through the posts, the debate ensues. Then conflicting information, then contradictory information.

It's crazy that something so mechanical and based on engineering could have so much subjective interpretation.

Just in time

Agree 100%!

Quikag

I hope these new .2 motors don't blow like the .1's. Hopefully Porsche learned their lesson with that debacle.

GrantG

They definitely won't blow "like the .1's" They spent too much money and effort to address that problem. Let's just hope they don't blow in some new way

Jimmy-D

They had plenty of practice on the E,F, and Gs.. Darn shame we were all Guinnea pigs.

Think about this. The 4.0 in the .1 RS and R were the only models that they used in that specific engine. What did they learn there??? Did not have a long shelf life for sure but longer than the .1 GT3