Sorry guys, meant to say power not torque, all these exams at the moment are
starting to get to me.
Daniel Kroehn
Recommending Datrats, supplying quality Datsun performance parts
www.Datrats.com.au
----- Original Message -----
From: <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Thursday, June 28, 2001 2:32 PM
Subject: Re: Throttle Body size??????
> I am not so sure that size of the throttle body directly correlates with
torque
> level! Perhaps when on a full throttle run it does though. The throttle
body is
> variable in it's flow ability anyway (with the opening and closing of the
> butterfly). I assume that if you had a masive throttle body, then at low
rpm,
> peak torque might be gained with only 75% throttle as opposed to 100%
throttle.
> Kinda like how F1 cars control their throttle these days.
>
> zac
>
> > Thanks Trev, I have 36 mm chokes in my webers at the moment and I
figured
> > out the crossectional area(combined) to be 40.71cm^2 on my 2L motor and
its
> > not too doughy down low at all. With the RB30 throttle body the entire
> > cross-sectional area is 23.75 cm^2 which means on a 1.8L litre it should
go
> > pretty well and have plenty of low end torque compared to the setup on
the
> > 2L. Thanks for the advice
> >
> > Daniel Kroehn
> > Recommending Datrats, supplying quality Datsun performance parts
> > www.Datrats.com.au
> >
> > ----- Original Message -----
> > From: Pooley, Trevor <[EMAIL PROTECTED]>
> > To: <[EMAIL PROTECTED]>
> > Sent: Thursday, June 28, 2001 1:02 PM
> > Subject: RE: Throttle Body size??????
> >
> >
> > > Daniel,
> > >
> > > You should be able to work it out theroetically.
> > >
> > > I haven't done the maths yet but will have to investigate. Should be
> > easier
> > > to work out for a NA motor than a boosted intake but simular
principals
> > > should apply. Think about main venturi's in DCOE weber's Small ones
> > increase
> > > air speed at low revs (ie throttle response) but at the expense of
> > outright
> > > flow at higher revs (hence their common description of Chokes).
> > >
> > > Have look at some racing cars F2/3. They have a small resticter in
front
> > of
> > > a massive plenum (Which must stuff up flow at higher engine speeds).
The
> > > outright rally cars have a restricter and only make 10hp or so more
the
> > > Group N.
> > >
> > > OK so what is the reverse of all this. Poor low rev throttle response.
> > Also
> > > why go big if there is a restriction in other areas. Ports, valves,
> > > intercooler, intake plumming also consider manifold length, diameter
and
> > > plenum size etc.
> > >
> > > Bottom line is everything must work together and going too big with
the
> > > thottle body may make it undriveable at low revs. It may make the
system
> > > mismatched in other areas making the whole thing worse.
> > >
> > > Regards
> > > Trev
> > >
> > >
> >
> >
>
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