inlet manifold/plenum chambers

[purplemonster]

I am looking to put a Vauxhall set up on my kit car,but the manifold will
not fit and I need to make one as no-one that I know about make such a
manifold,

how important is flow in a manifold and will it affect the mapping much?
dose the volume in the manifold make much difference,? is it better to go
bigger or smaller?

Rob

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----- Original Message -----
From: "John W. Stewart" <stewartjw at home.com>
To: <diy_efi at diy-efi.org>
Sent: Saturday, July 07, 2001 8:05 PM
Subject: Re: Crank Sensor/Cam sensor


> Bill,
>
> Though GM used both crank and cam sensors in 1996 to control timing, I
doubt
> that the lack of a crank sensor will cause this problem. If the cam sensor
> was bad, you would have erratic running on all cylinders, not just one
bank.
>
> Since we have no way to know how Howell programmed ECU, it's tough to
> detrmine if that is the  problem. If the car runs fine when cold, and only
> runs intermittently rich on one bank during closed loop, your most likely
> culprit is a bad O2 sensor ( not likely, since a code would have been set)
> or an intermittent connection in the wiring from the sensor to the ECU .
> Intermittent problems ( whether high or low resistance causing a change in
> the voltage reading the ECU sees) may not set a code because the duration
is
> to short. If this was the case, you would see the problem you describe,
the
> ECU would lean out that side and set the code for too lean a mixture.
>
> As mentioned , you could switch sensors from side to side to see if the
> problem switches sides. My feeling is the wiring on connectors. Get the
VOM
> out and check the resistances for the O2 wires on the good side, and do
the
> same on the bad side. Providing the wiring lengths are not too dissimilar,
> they should be close. If one is way off,  you know the problem is in the
> wiring or the connector(s). While you're at it, wiggle the connector pins
to
> see if the values change, if they do, you've found the problem.
>
> John S.
> ----- Original Message -----
> From: <Onebil2mny at aol.com>
> To: <diy_efi at diy-efi.org>
> Sent: Saturday, July 07, 2001 8:41 AM
> Subject: Crank Sensor/Cam sensor
>
>
> > I have a question concerning the GM ECM# 18188021...  According to the
GM
> > manual I am using, both the crank sensor and the cam sensor are used to
> > determine #1 tdc and thus to calculate the computer will calculate the
> > correct sequence with a 1 in 6 chance of getting it wrong. Could the
lack
> of
> > a crank sensor coupled with a bad cam sensor cause this rich on one bank
> > problem I am experiencing? It is a seemingly random condition.
> >
> > Thanks!
> > Bill K
>
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