Jump to content

Welcome to Autoworld Forum !

Sign In or Register to gain full access to our forums. By registering with us, you'll be able to discuss, share and private message with other members of our community.

Close
Photo

RAM Air + CAI + Autoturbo


  • Please log in to reply

#31
alanltl

Posted 24 June 2004 - 10:18 AM

alanltl

    White Lightning

  • Members
  • PipPipPip
  • 5,522 posts
yes, he one to use the fan to drive the other one by genaration the DC form
first fan. the DC fan must have higher rotation speed fan to compress the
air. correct me if i wrong drexchan. maybe can discuss with you next time
we meet

#32
g88

Posted 24 June 2004 - 10:26 AM

g88

    Duke of Hazzard

  • Members
  • PipPipPipPipPipPipPip
  • 48,280 posts
LEt discuss this interesting topic is coming small TT....yet to decide
when Big Smile

#33
drexchan

Posted 24 June 2004 - 01:51 PM

drexchan

    Hot Rod

  • Members
  • PipPipPipPip
  • 14,758 posts
I got flamed in the car mod forum ler.....

#34
ahboy

Posted 24 June 2004 - 02:04 PM

ahboy

    White Lightning

  • Members
  • PipPipPip
  • 5,914 posts
Ohhh so from there drex good job, well what alan mentioned is correct oso
cause the fan rotations speed is oso a matter. So any engineer here would
like to help please? Drex heard from u last time that ur brother oso
engineer for mas rite, so what he thinks about this?

#35
drexchan

Posted 24 June 2004 - 02:05 PM

drexchan

    Hot Rod

  • Members
  • PipPipPipPip
  • 14,758 posts
The idea is like this:

When you start the engine. The idling revolution is about 800rpm.

The volume of air sucked into the engine (consumed) is something like:

Volume = RPM x 0.5 x displacement x volumetric efficiency

displacement = you engine capacity

times 0.5 because 2 cylinders (1 and 4, 2 and 3) move at the same time.

volumetric efficiency (or whatever they call it) is a value lower than 1
in NA engine. Due to the restriction imposed on the airflow by the intake
system, the air sucked into the engine is always lower than the ideal
value. That's how the vacumme is created.

OK, how my autoturbo theoretically works:

The air being sucked drive BOTH fans initially. So the RPM of the fans is
proportionally controlled by the revolution of the engine, NOT the current
supplied (there is NO external DC required).

As the first fan sins, it generates DC which can be supplied to the second
fan. Since the second fan is already spinning, the additional DC only
assist (add extra forces) the spinning of the fan (2nd). Theoretically, if
the resistance is low enough. The additional force will rev-up the 2nd fan.

This results in more air being sucked and higher velocity. Hence the first
fan spins faster. As such, a loop in created and the fans RPM will
increase to an extant that EITHER the 2nd fan burn or an equilibrium is
achived.

Let assume that the fan doesn't burn, and the fan can still go faster. You
move the car. RAM air comes in action. The air is firced into the intake
through the fans. What happens? Faster spinning of the fans and this is
coupled by the loop effect that I've explained above. Could you imagine
the effect if the fans doesn't fail?

I know someone is gonna "splash me with cold water". But, never try never
know. Maybe we can learn something from this project. It's and DIY
project, won't cost me hundreds.


#36
drexchan

Posted 24 June 2004 - 02:09 PM

drexchan

    Hot Rod

  • Members
  • PipPipPipPip
  • 14,758 posts
ahboy,

my brother isn't working for MAS. He'll go to Taiwan for his Master degree
in Aviation Control. More to electronic system used in the aircraft. By
the way, he agrees with my theory. vk9 calls. Asking about the superlon.
You give him a call already?

#37
drexchan

Posted 24 June 2004 - 02:11 PM

drexchan

    Hot Rod

  • Members
  • PipPipPipPip
  • 14,758 posts
ahboy,

my brother isn't working for MAS. He'll go to Taiwan for his Master degree
in Aviation Control. More to electronic system used in the aircraft. By
the way, he agrees with my theory. vk9 calls. Asking about the superlon.
You give him a call already?

GUYS,

Now I repeat. The fan speed is determined by the suction of the engine AND
the ram air effect. NOT the current supplied from the first fan. The
current ONLY assist (add additional force) to the 2nd fan. Get it?

#38
waikhei

Posted 24 June 2004 - 02:12 PM

waikhei

    Tokyo Drifter

  • Members
  • PipPipPip
  • 3,013 posts
who will be splash u cold water....but i dun understand....hahah


#39
drexchan

Posted 24 June 2004 - 02:18 PM

drexchan

    Hot Rod

  • Members
  • PipPipPipPip
  • 14,758 posts
those in the car mod forum lor....

#40
ahboy

Posted 24 June 2004 - 02:18 PM

ahboy

    White Lightning

  • Members
  • PipPipPip
  • 5,914 posts
I understand ur idea, but everything hav its maximum, say when our car
reach high speed around 180 or 190 km/h the rpm on our meter is about say
5500 to 6000 rpm but for the fans, can the fan stand this fast or not, n i
oso know it doest not powered by any dc but i still think there must be a
maximum fan can spin. Bro we r not trying to pour any cold water on u but
we r here to discuss so that we all can make up something that is special
n cheap to play with diy gadget that can help our car rite or not. So we
better find one day or nite to TT n bincang this idea n try to find a
solution ok bro, smile smile ler hehehe