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Forum locked  This topic is locked, you cannot edit posts or make further replies.  [ 5 posts ] 
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PostPosted: Tue Apr 30, 2002 11:23 am 
Hi, first of all im sorry to attack this board with a non slant question, but i know there's a lot of slant-turbo knowledge out there.

I've been playing with an idea of a twin turbo V8 for a while. The basic turbo techniques are pretty simple but there is few things i dont quite understand.
The engine is a carburated one. I guess the options are to line up the turbo pressure output onto the top of carburator or to cover the whole carb with a pressure box.

If i did it way or another, how on earth the carb can understand anymore the vacuum signal from the engine? Part throttle and WOT jets on a carb-throat are on the pressure side of the plates!!! Also how the fuel can flow down out of the bowls when the throats are under pressure, i cant see fuel pressure affect it since the bowl itself is not pressurized!!!? Please enlighten me and share your golden drops of turbo knowledge.


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PostPosted: Tue Apr 30, 2002 1:47 pm 
Hello I run a blow thru slant 6. When you blow down thru the carb the fuel bowls are pressurised. That is why you need to increase fuel pressure with boost. Lets say you are running 10 psi and your fuel pressure is 5psi, The fuel does not have the force to push the needle and seat open. you will need to increase the fuel pressure 5 or so psi above boost pressure to fill the bowls.

andrew wagner
(User Above) wrote:
:
: Hi, first of all im sorry to attack this board
: with a non slant question, but i know
: there's a lot of slant-turbo knowledge out
: there.
:
: I've been playing with an idea of a twin turbo
: V8 for a while. The basic turbo techniques
: are pretty simple but there is few things i
: dont quite understand.
: The engine is a carburated one. I guess the
: options are to line up the turbo pressure
: output onto the top of carburator or to
: cover the whole carb with a pressure box.
:
: If i did it way or another, how on earth the
: carb can understand anymore the vacuum
: signal from the engine? Part throttle and
: WOT jets on a carb-throat are on the
: pressure side of the plates!!! Also how the
: fuel can flow down out of the bowls when the
: throats are under pressure, i cant see fuel
: pressure affect it since the bowl itself is
: not pressurized!!!? Please enlighten me and
: share your golden drops of turbo knowledge.


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PostPosted: Tue Apr 30, 2002 5:18 pm 
There is a pressure drop across the venturis, this drop is what draws the fuel thru the jets. It doesn't matter if you suck the air with the pistons or blow the air in with a turbo, that pressure drop still happens.

As Andrew points out, you do need to equalize the fuel bowls to the boost.



klesteb@aol.com


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 Post subject: Re: Turbo Tips
PostPosted: Tue Apr 30, 2002 5:38 pm 
(User Above) wrote:
: There is a pressure drop across the venturis,
: this drop is what draws the fuel thru the
: jets. It doesn't matter if you suck the air
: with the pistons or blow the air in with a
: turbo, that pressure drop still happens.
:
: As Andrew points out, you do need to equalize
: the fuel bowls to the boost.


One other problem with "blow through" set-up, especially carbs. inside a sealed pressure box, is that hollow floats can crush. I had to fill some brass floats with foam to keep them from crushing under high boost.
DD


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PostPosted: Sat May 04, 2002 7:09 am 
(User Above) wrote:
: Hi, first of all im sorry to attack this board
: with a non slant question, but i know
: there's a lot of slant-turbo knowledge out
: there.
:
: I've been playing with an idea of a twin turbo
: V8 for a while. The basic turbo techniques
: are pretty simple but there is few things i
: dont quite understand.
: The engine is a carburated one. I guess the
: options are to line up the turbo pressure
: output onto the top of carburator or to
: cover the whole carb with a pressure box.
:
: If i did it way or another, how on earth the
: carb can understand anymore the vacuum
: signal from the engine? Part throttle and
: WOT jets on a carb-throat are on the
: pressure side of the plates!!! Also how the
: fuel can flow down out of the bowls when the
: throats are under pressure, i cant see fuel
: pressure affect it since the bowl itself is
: not pressurized!!!? Please enlighten me and
: share your golden drops of turbo knowledge.


Go to Yahoo Groups and register. Join the blowthruturbo forum. This is a carb-oriented DIY tech forum with extensive archives and many sharp contributors.

Gothamauto@aol.com


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