Engine Cover
- Thread starter davidcross
- Start date
38F3E1
PCGB Member
David.
Nobody really removes them in the UK because it does not cause engine overheating problems on the 993 (it can on the 964 which is why it is much more commonly removed on the 964). Therefore you might find secondhand ones tricky to locate.
It keeps the bottom of the engine much cleaner with it on. If it was already fitted on a 993 I would certainly not remove it. If I bought a car without one I would try to find one but your car is certainly not dangerous without it at legal speeds in the UK (if you are planning high speed trips on the autobahn then different emphasis).
Ian.
Nobody really removes them in the UK because it does not cause engine overheating problems on the 993 (it can on the 964 which is why it is much more commonly removed on the 964). Therefore you might find secondhand ones tricky to locate.
It keeps the bottom of the engine much cleaner with it on. If it was already fitted on a 993 I would certainly not remove it. If I bought a car without one I would try to find one but your car is certainly not dangerous without it at legal speeds in the UK (if you are planning high speed trips on the autobahn then different emphasis).
Ian.
I would suggest leaving it off in the summer but putting it back if you use your car in the winter to help keep road salt and grit away from the engine.
ORIGINAL: dongawoy
Just out of interest has anyone had there undertrays go missing? On my last service I was notified that one was missing, and im sure ive had to replace it before.[][
Was advised at the last service that my undertray was missing ( had not noticed any increase in noise ) - was thinking back to the last time it was removed and it would have been at the same indie - anyone had one fall off, I would have thought it would be noticeble if it fell off whilst you were driving
Pete
In the maintenance section of the first volume of the 993tt manual set at the end where it suggests road testing the car without the undertray to help find leaks. In bold it states not to exceed 95 mph.
Thanks phelix for looking up the page number in the manual, I'm without my copy at mo.
I 'm not sure why they did not fit them to cup cars, maybe for speed of access on pit stops, plus the aerodynamics are different on the cup cars, than they are on a standard c2 or c4.
what I would say for sure is porsche spend millions developing these cars and on porsche related motor sport and while porsche do sometimes get things wrong, this undertray over tens of thousands of 993s must of cost a lot of money,if it was not really needed I doubt porsche would have fitted it for fun.so I would tend to trust porsche and their thousands of engineers and designers, over the opinion of a guy in a shead.
As someone else said on here, there is a thread on rennlist that is well worth reading to help you make up your own mind on what is best, cheers
I would guess the cup cars have an aerodynamic package that is developed without the undertray in place/in mind. And they run a much lower ride height.
Still here and planning to stay, although currently Porsche-less. As for a more senior role I might be tempted, particularly if you double the salary. [
]
Just a few notes from fifteen years of 964 ownership:
- The undertray with sound deadening was deemed necessary for the tight noise laws in Switzerland;
- It's aerodynamic contribution is questionable -my car felt stable at 173 at Bruntingthorpe......[]
- You can't spot any oil leaks
- Oil will be soaked up by the sound deadening
- The fan blows down thru the engine so from my experience blows the crud away and I've had no problems with dirt from all season use of a road going 964 in past
- If you do fit it, check the fixing struts are in position, partic around the gearbox end!
ORIGINAL: Melv
Just a few notes from fifteen years of 964 ownership:
- The undertray with sound deadening was deemed necessary for the tight noise laws in Switzerland;
- It's aerodynamic contribution is questionable -my car felt stable at 173 at Bruntingthorpe......[
- You can't spot any oil leaks
- Oil will be soaked up by the sound deadening
- The fan blows down thru the engine so from my experience blows the crud away and I've had no problems with dirt from all season use of a road going 964 in past
- If you do fit it, check the fixing struts are in position, partic around the gearbox end!
Porsche fitting the undertray for compliance with noise regulations in switzerland is just an urban myth.
Porsche AG have confirmed this themselves, you can read all the details on rennlist.
Also if noise compliance in switzerland had been the reason, porsche would not have fitted it to tens of thousands of cars,when all they would have needed to do is fit it to the handful of cars destined for switzerland. As we know porsche add or take away bits to suit the country each 993 was destined for, which is why the uk got obd 1 and the usa got obd 2 and sai valves etc, certain uae countries got cars with no cats or emissions control system, the list goes on, so if they go to all that trouble with the rest of the world, if the under tray was for noise compliance in switzerland, only the swiss cars would have had undertrays
Just thought I'd chip in on this one, as it's a frequent one for 964s......
I've run them with and without, mainly for protection with (in winter) and without in the summer (on the advice of the specialist).
Though I've never had one overheat, I do a few track days, so that was the reason for the summer to remove.
I've also heard the aerodynamics quote, but CUP cars never had them fitted and I've never felt a need for speed restriction (and have driven over 240kmph with and without).
993 has hers fitted, for now, but will be removed when I re-fit the summer wheels.
Best Rs,
Jon
I've run them with and without, mainly for protection with (in winter) and without in the summer (on the advice of the specialist).
Though I've never had one overheat, I do a few track days, so that was the reason for the summer to remove.
I've also heard the aerodynamics quote, but CUP cars never had them fitted and I've never felt a need for speed restriction (and have driven over 240kmph with and without).
993 has hers fitted, for now, but will be removed when I re-fit the summer wheels.
Best Rs,
Jon
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