WHY? does my 911&914 rune better with 1/4 tank |
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
WHY? does my 911&914 rune better with 1/4 tank |
yellow914 |
May 9 2008, 12:23 AM
Post
#1
|
Member Group: Members Posts: 183 Joined: 28-March 08 From: San Jose, CA Member No.: 8,861 Region Association: Northern California |
I noticed when I had a 74 carrera 2.7 that at about 1/4 tank I'd get more H.P.'s and now that I have a 75 1.8 914 I get the same thing way better throttle response??? I doubt it's due to weight...any ideas?
|
mightyohm |
May 9 2008, 12:45 AM
Post
#2
|
Advanced Member Group: Benefactors Posts: 2,277 Joined: 16-January 03 From: Seattle, WA Member No.: 162 Region Association: Pacific Northwest |
The gravitational pull of the fuel in the tank counteracts the torque of the engine when the tank is full. At less than half a tank, the effect is reversed. The net effect is that with a nearly empty tank, the fuel is actually accelerated into the engine, like a tiny turbocharger inside your fuel pump.
(IMG:style_emoticons/default/blink.gif) |
ericread |
May 9 2008, 03:04 AM
Post
#3
|
The Viper Blue 914 Group: Members Posts: 2,177 Joined: 7-December 07 From: Irvine, CA (The OC) Member No.: 8,432 Region Association: Southern California |
The gravitational pull of the fuel in the tank counteracts the torque of the engine when the tank is full. At less than half a tank, the effect is reversed. The net effect is that with a nearly empty tank, the fuel is actually accelerated into the engine, like a tiny turbocharger inside your fuel pump. (IMG:style_emoticons/default/blink.gif) (IMG:style_emoticons/default/bs.gif) Sooooo, the gravitational pull of the fuel... I have posted some BS remarks before, but this tops the chart! Let's see now, gravitational pull of an object is directly proportional to it's mass. Therefore, the mass of the gasoline would be so significant as to exert it's gravitational pull over the Earth's gravity and other large objects... (IMG:style_emoticons/default/av-943.gif) (IMG:style_emoticons/default/av-943.gif) (IMG:style_emoticons/default/av-943.gif) A very entertaining explanation, but it just doesn't hold water... er, gas. Let's see... A gallon of gas weighs about 6 pounds. So a 12 gallon tank would weigh about 72 pounds. For shits and giggles, let's say that the weight of a gallon of gasoline = about 0.45 Kilograms at 60 degrees F (temperature is actually an important variable here). Thus, you have a mass of about (72 pounds times .45) 32.4 Kilograms. So the 32.4 Kilograms of mass (the gasoline) is interacting with a significant gravitational force. Let's see, the other really big gravitational force is the Earth, which has a Mass of about 6,600,000,000,000,000,000,000 (6.6 sextillion) short tons (6.0 sextillion metric tons), or 6.0 × 1024 kg. So in a contest of gravitational forces between the Earth and the gas, the Earth clearly wins. In fact, if it were true that there was a significant gravitational pull of objects which have a minor mass, say like a 50 story building, then the gas would be pulled to the building rather than to the engine. In fact we would all be pulled to the building. Bummer. Nope. But it was fun to dissect. I haven't done this math in about 25 years, since I taught astronomy at a planetarium, so I may be off by a decimal point or so. But it really doesn't matter, the gravitational pull of non-significant objects (say, smaller than the moon) just don't have any measurable effect, and thus, doesn't asssit in your car's performance. Let's do this again sometime (IMG:style_emoticons/default/bye1.gif) |
Lo-Fi Version | Time is now: 28th September 2024 - 07:30 AM |
All rights reserved 914World.com © since 2002 |
914World.com is the fastest growing online 914 community! We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ... |