Tuning do this work or help

[gregor]

well then my friend u need to look up the venturi effect it is when a mass of air flows through a convergent duct causing the velocity to increase or you could go on you tube and watch a video on a venturi tube.

the fan does not keep up the the engines induction through the entire rev range but does help a little in the lower revs if you look at the graphs that guy had earlier to over come the fan being an obstruction at high revs then all that needs to be done is fit a simple trap door valve it works by when the fan is no longer producing enough thrust to keep valve closed then it opens and lets the engine suck in air freely.

cheers gregor

 

[gregor]

the gains are not large enough to even be considered by a manufacturer but at least there is gains.

cheers gregor

 

[arc]

i understand about the venturi effect, but i also understand an electric fan stuck in an inlet will not be beneficial overall. If it could supply enough airflow, then it'd be drawing so much off the electrical system, thus increasing parasetic losses, or be running off batteries that weigh so much they'd negate the power benefit.

 

[craigb244]

yup I do reckon it might help at low RPM. BUT no where near as good as a well designed induction kit.

At the end of the day even a turbo that is set up to come in at a good time is restrictive at top end and that is someone designed for automotive use and consumes thousands of watts of energy from the exhaust.

we are talking here of something that is been used for something its not designed to and using about 60watts

 

[David C]

At 6000rpm, a 1L engine needs 3000L of air every minute.
So to avoid being a restriction, the fan needs to pump 3000L/min.
To produce 0.5bar boost it would need to pump 4500L/minute.

The power needed to run an electric fan capable of doing that isn't doable unless you run your car off of a very long mains extension cable...!!

 

[arc]

re the power runs on that link as well, unless they were back to back runs, on the same piece of ground then they don't really mean anything at all.

 

[punto_matt]

Not exactly hard to change them either if they wanted to.

 

[arc]

theres that too, if you knock the G-tech so it's not mounted at the same angle - it'll skew the results

 

[David C]

You could obviously power your fan from an external engine on a trailer.
This is an example of a 160CFM (4500L/min) compressor:

But towing that around may blunt your style a bit...

 

[gregor]

i will happily admit that the ones on ebay are crap but i think some of the home made ones are good. like this one but as u said it may drain electric a bit but i am working on one just now. watch the video at about 38 secs you can hear an amazing rpm increase.



cheers gregor

 

[David C]

...but as u said it may drain electric a bit ...

a bit!!!!!!!

Sure there are fans/airpumps capable of doing it, but powering it is the issue.
I think I worked out once that if you filled the boot with batteries you could get 10s of boost a week!! (or something like that), either way, the weight of batteries and recharge time make the idea a non-starter.


This is a subject that comes up on car forums quite a lot.....

 

[arc]

I still can't see the net effect of it it being beneficial.

you need a petrol powered leaf blower..

 

[kingy2184]

Not exactly hard to change them either if they wanted to.

it was for a project to see if there was actually a difference so i dont know why he would want to change it..

 

[Diwiak]

OMFFFFHG leaf blower motorfactors selling them..??

 

[punto_matt]

it was for a project to see if there was actually a difference so i dont know why he would want to change it..

Great?

 

[gregor]

if i fluid such as air can achieve 30 mph through a cylinder 70mm in diametre then if iv calculated it right it should output 43291.3536 litres/min.

30mph doesnt seem that hard to reach but i do think i may have screwed up the calculation so i will give you guys the formula to work out

A * C / 1000 = litres per sec

A = inside area of pipe/cylinder (cm2)

C = velocity of fluid (cm per sec)

cheers gregor