Additional details on the 718 from C&D

[blog.caranddriver.com]

Interesting details:
--they thought the exhaust note wasn't to bad
--suggested the engine compartment was going to be really hot with the exhaust routed all around the oil pan, necessitating a change (from the 911) from a plastic to aluminum sump cover
--an engineer suggested an external oil collector (acumsump?) might might be a good idea for people running racing tires--presumably at the track
--Reportedly, the 718S was within 2 seconds of the GT4's "ring" time; seems a bit difficult to believe but who knows...

A few thoughts:
--If the engine compartment was going to be this hot, I wonder if aluminum shielding would be appropriate to protect the oil from excessive heat? or a heat wrap--lots of corvette guys do this on the C7 where the exhaust passes near the differential because of the exhaust heating up the diff fluid at the track.

--The engine already has the oil-water heat exchanger built in--right?

--

Interetind read.

The following bit addresses the issue of 'turbo lag':

"To maintain responsiveness even when the driver lifts off the gas, Porsche briefly leaves the throttle open while retarding the timing, cutting fuel, and shutting the wastegate, essentially pumping air through to the turbo to keep it spinning; get back on the gas quickly, and the turbo’s already in play—no waiting for it to spool up."

Things have changed a lot since the days when engines were largely, or entirely, mechanical. With computers being an integral part of the engine now, throttles can be 'wide-open' with no fuel running through them.

Although I'm not a fan of the sound the engine makes, there's no denying it makes bigger torque, and at much lower revs - something only large displacement V-8's (or bigger) used to do in the 'old days'.

Mike, your questions about heat are bang-on. As you know, heat has always been the bane of the turbo, and can't be avoided, given that it's hot exhaust which spins the turbo. Porsche's goal was improved efficiency (in the lab), and, in meeting that goal, Porsche managed to make a more powerful engine (probably in anticipation of the hue and cry regarding the loss of 2 cylinders.

What only time will tell, is whether these engines will be as reliable as the 9X1 which, so far, has been bullet-proof. Lessees and short-term owners may not care as much as those who keep their cars well beyond warranty expiry.

The 9X1 engine has an oil/coolant heat exchanger; I assume this has been carried over in the new engines.