l0rd
|
| posted on 22/3/09 at 08:56 AM |
|
|
Anybody Know 1 and 2 Conclusion
Yesterday I had a really weird stupid idea.
I thought that instead of scrapping the AC, if there was a way to use it in order to feed the engine with cold air.
Obviously, it appears that the gain will be less than the loss of HP due to AC.
|
|
|
|
|
Paul TigerB6
|
| posted on 22/3/09 at 09:04 AM |
|
|
Just drive your car in the winter - that will give you the most power with that lovely cold damp air. I will store the car during the spring and
summer for you, and because i am nice, i'll take it for regular runs for you!! 
Sounds a very complex way to try and cool the air. I wouldnt think your average AC system would cool the air that much given the volume of air
consumed by the engine
|
|
|
austin man
|
| posted on 22/3/09 at 09:25 AM |
|
|
scrap the ac and fit a supercharger ?
if your running injection have a pipe from the throttle body to the front of the car or via the inner wing this will pull in as much cold air as
posibble.
Also conside vebting your engine bay so hot air can get out weve done this on an MK indy running a 2litre zetec managed to drop the running
temperature by 10 degrees. Therefore underbonnet temp also reduced.
Life is like a bowl of fruit, funny how all the weird looking ones are left alone
|
|
|
Ivan
|
| posted on 22/3/09 at 09:37 AM |
|
|
No - it wont work because the energy you put into cooling the air will be more than the energy you gain by cooling the air.
The only way it will work is if you have a charge cooler with good water reservoir that is chilled by the aircon at part throttle - then at full
throttle you switch out the aircon with a throttle switch, switch on the the charge cooler circulation pump and provided the charge cooler isn't
so restrictive that it throttles airflow you have a low temperature power boost.
Of course the weight gain of aircon an, charge cooler and water reservoir might also negate the power boost.
This will of course work very well with a turbo for short boost periods.
|
|
|
BenB
|
| posted on 22/3/09 at 09:44 AM |
|
|
Won't work.
Conservation of energy principle.
AC systems are noisy, ineffecient things so any power boost you'll get from running the inlet through the AC would be more than lost by the
energy initially required to power the AC.
What would be interesting is if you somehow ran the AC off a clutch driven system so you could use it as a form of braking.... But as already said
that would be heavy and the reduction in power:weight would more than compensate for any power hike!!!
IE you need to find a way of using energy you wouldn't normally make any use off....
|
|
|
clairetoo
|
| posted on 22/3/09 at 10:37 AM |
|
|
Another way of using cooling to help power is to cool the fuel as much as possible - I used to keep the fuel for my drag bike in the fridge , then
fill and re-fill the insulated tank just before running - it definatly made a difference (but then it only ran on full power for about 8 seconds
......)
Most modern diesel vans have a cooler matrix in the fuel return line to cut down on heat buildup in the fuel tank .
Its cuz I is blond , innit
Claire xx
Will weld for food......
|
|
|
rusty nuts
|
| posted on 22/3/09 at 10:48 AM |
|
|
quote:
Originally posted by clairetoo
Another way of using cooling to help power is to cool the fuel as much as possible - I used to keep the fuel for my drag bike in the fridge , then
fill and re-fill the insulated tank just before running - it definatly made a difference (but then it only ran on full power for about 8 seconds
......)
Most modern diesel vans have a cooler matrix in the fuel return line to cut down on heat buildup in the fuel tank .
A good reason to have a fuel swirl pot at the rear of the car rather than in the engine bay.
|
|
|
jlparsons
|
| posted on 22/3/09 at 11:28 AM |
|
|
You said it yourself, you'll loose more energy than you'll gain. If you want to use engine power to increase the density of the air feed,
use a supercharger.
I did have a funny idea once to use the exhaust power to ionise air going into the engine. This would break O2 bonds and lower the initiation energy
required, so increasing energy output. So instead of using the exhaust energy to throw more air and fuel in, you're actually delivering that
energy itself back into the start of the equation. Unfortunately it was never going to go anywhere as there's no way to generate that much
static from the exhaust.
BMW have come up with a way of doing it that looks interesting - using the excess engine heat to create steam to create drive directly. Check this
out - LINK
Any resemblance to real persons, living or dead is purely coincidental. Some assembly required. Batteries not included. Contents may settle during
shipment. Use only as directed. No other warranty expressed or implied. Do not use while operating a motor vehicle or heavy equipment. Subject to
approval, terms and conditions apply. Apply only to affected area. For recreational use only. All models over 18 years of age. No user-serviceable
parts inside. Subject to change. As seen on TV. One size fits all. May contain nuts. Slippery when wet. For office use only. Edited for television.
Keep cool; process promptly.
|
|
|
speedyxjs
|
| posted on 22/3/09 at 11:28 AM |
|
|
quote:
Originally posted by austin man
scrap the ac and fit a supercharger ?
Thats my plan. You'll gain much more power than feeding the engine with ac (although i have thought about that before)
How long can i resist the temptation to drop a V8 in?
|
|
|
l0rd
|
| posted on 22/3/09 at 11:41 AM |
|
|
quote:
Originally posted by rusty nuts
quote:
Originally posted by clairetoo
Another way of using cooling to help power is to cool the fuel as much as possible - I used to keep the fuel for my drag bike in the fridge , then
fill and re-fill the insulated tank just before running - it definatly made a difference (but then it only ran on full power for about 8 seconds
......)
Most modern diesel vans have a cooler matrix in the fuel return line to cut down on heat buildup in the fuel tank .
A good reason to have a fuel swirl pot at the rear of the car rather than in the engine bay.
Which means that If you use a Peltier and a heatsink, You could cool down the Swirl Pot throughout your drive. Don't know though how much cooler
it will get though.
|
|
|
Ninehigh
|
| posted on 22/3/09 at 12:22 PM |
|
|
quote:
Originally posted by BenB
IE you need to find a way of using energy you wouldn't normally make any use off....
Solar panels?
The steam thing sounds interesting, looks like it could be used to power a turbo or something...
|
|
|
jlparsons
|
| posted on 22/3/09 at 02:48 PM |
|
|
quote:
Originally posted by Ninehigh
The steam thing sounds interesting, looks like it could be used to power a turbo or something...
I was pondering the same. I'm sure I've heard of folk injecting water into the exhaust manifold at low revs so the steam expansion gives
higher presure and boosts the turbo up to speed quicker. I think they use it to get rid of some of the lag when using massive great big turbos.
I was also thinking that perhaps it might be a good way to cool high rpm engines like bike engines. I've heard they spray far more fuel in than
they actually burn at certain times to cool the pistons - might a water injector do the same but save the fuel...?
|
|
|
Ninehigh
|
| posted on 22/3/09 at 03:16 PM |
|
|
Well a turbo runs off the fumes from the exhaust doesn't it? Maybe this is a way of having it running better under track conditions, the steam
keeping the turbo running at all times therefore bigger turbo with no lag. Just make sure the dump valve works!
|
|
|
.jpg)
.jpg)
