Marlon

Jimbo - with ya' brotha'! Cold, dense air is good for the engine.

AOW162435

Eric,
Is the piece I mentioned indeed an RS piece (as I thought)? I'm not sure how this snorkle would work on the Turbo...

Andreas

jimbo3

I'd rather have a cold, dense beer in my belly than one theoretical HP worth of not-as-hot air in the intake. $55 would buy two cases of ice cold Shiner Bock OR one IHP**- you decide! (**IHP = Imaginary Horse Power)

Marlon

Can you present you data logged testing for group interpretation or provide a link to it???

NP993

Dood,
I'll post this link for you again, being that it's already been posted twice earlier in this thread and apparently you're having reading comprehension problems:

https://rennlist.com/forums/964-forum/277537-air-intake-temperatures-with-a-cup-drilled-airbox-versus-a-stock-airbox.html

The above is a six-page thread that discusses, in great detail, everything you need to know about intake temps, cold air snorkels, cup air boxes, whatever. And several of the people involved in the discussion are professionals who modify 993's for a living.

Do a search. Then do a search again. And then when someone posts a link (twice) to a preexisting thread, take a moment and read it.

Marlon

Yep - read all that and the bottom line still is: cold dense air is better than hot air for engine combustion. Pilots must compute their Power Available versus Power Required for every flight (I did it every day for 20 years). Why??? Because hot air is bad & cold air is good (we'll keep Humidity out of it for now). That same incontrovertible physics element of air temp vis-a-vis engine performance applies to our 993. The indisputable part relates to cold air. If hot air was 'good' then a Turbo would not need an intercooler - that makes sense doesn't it? (Wanna' talk about NO2????) Put in another way:

Hot air = bad

Cold air = good

The way those indisputable facts are put into practical application are the issue at odds here.

And Yes - 993 drivers in Alaska enjoy more HP to the rear wheels than we do given all other things equal.

The big issue is "Does the Porshce p/n snorkle actually 'choke' the cold air flow with a 993 automated spoiler set up"? In the case of 'choked' cold air flow, a heavy dose of hot air does seems to be winning out

Leander

So then Water would be even better than cold dense air?

AOW162435

Regardless & irregardless - it's damn hot around these parts today. The only way you'll get 'cold' air to your 993's motor is to shove a block of dry ice in the airbox!

105 degree heat index today? Ridiculous.

Andreas

Marlon

No, no & no again on water. Why? - it's simple: the water molecules take up the space of the much needed Oxygen molecules that support the Combustion process. (Kind of on the order of why humans don't breathe water:^)

Wilder

I read that thread too and arrived at a very different conclusion. Bottom line for me is that the 34 years of engineering that have gone into this car has resulted in a very efficient design that may reduce power by no more than 5HP in stop and go traffic where it wouldn't be of use or noticed and optimizes power when the car is operating at speed. I'm no engineer but I doubt anyone on this forum can come up with a better idea without causing some major compromise.

Marlon

Louis - brilliant observation and succinct summation

Marlon

...but I think Porsche recognized that a practical 'compromise' must be fielded, and it is:

TT

chris walrod

but one can increase cylinder pressure by inducing -some- amount of water

Marlon

...I'm getting out of the pool for a while (get it???)

Peter R.

Liquids like H2O, being sort of kind of incompressible, may have a somewhat detrimental effect on the performance of an internal combustion engine, which derives it's energy from errr...compressing...

Peter R.