FS Gas kit

Apr 07, 2004 7 Replies

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LEE ARGYLE 22 years ago

As new

Fit any 3.5 V8 efi

single boot tank

Offers around £350

Tel 01983 524912

Lee

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Tom Woods 22 years ago

Is a kit for an efi different for a kit for a normal carbed v8?

I'm after one for a normal v8.

If it will fit mine -

What size is the tank (capacity and external dimensions please), and where about are you!

Thanks

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Austin Shackles 22 years ago

On or around Thu, 08 Apr 2004 09:10:35 +0100, Tom Woods enlightened us thusly:

you'll need different mixers.

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would be a goodplace to start looking, since he specialises in 'em - though the ones thatfit inside the aluminium semicircular tubes apparently are a sod to fit -does make a nice "invisible" fitment when done though. If the kit is a closed loop one, you'll have to add a lambda sensor to the exhaust.

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balloons 22 years ago

The only problem with these mixers is that they significantly reduce the airflow into the plenum chamber. Probably OK for a standard car but it'll strangle a tuned motor (BTDT).

Malcolm

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Austin Shackles 22 years ago

On or around Thu, 8 Apr 2004 09:47:30 +0000 (UTC), snipped-for-privacy@cix.compulink.co.uk enlightened us thusly:

you can specify different sizes; I've heard a formula for this - mixer size is 7-10 mm² per hp. if you work this out for a 150 HP engine, you get

36-44mm dia, roughly, for a single mixer, or 25-31mm dia if you have twin mixers. I think mine's running 2x32 at the moment, which is towards the high end, but they were originally got for an engine rated at 180 HP. This might of course be why it's not running right :-)

if you start tuning the V8, 'specially a 3.9, you should easily get it over

200 bhp. feeding in 200, you get mixer size 42-51mm for a single mixer.

AIUI, especially with open loop, the larger the mixer the more critical the tuning, 'til you reach a point where it'll not run at all. Using a mixer a bit on the small side makes for easy tuning at the expense of a bit of top-end power.

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balloons 22 years ago

Mine was a Rovertec-modified 4.6 with 280bhp (in fact a similar setup to my current 130 although that is running a Weber 500) and that had a Mark Adams enlarged plenum and we couldn't, at the time, get a decent trade-off between petrol and LPG performance. The largest mixer that would work cost me 20bhp on petrol! I know these figures as Brian, at Mech Repairs in Cheltenham, did a back-to-back rolling road test with my 4.6 and a 5.7 Overfinch and the power and torque figures were very similar.

Malcolm.

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Austin Shackles 22 years ago

On or around Thu, 8 Apr 2004 19:56:54 +0000 (UTC), snipped-for-privacy@cix.compulink.co.uk enlightened us thusly:

I think you almost always (bar for impco-style variable mixers, maybe) end up with some restriction. However, if yer getting 280 BHP anyway, then losing 20 is not the end of the world, if you can get summat similar on gas. What power did you get on gas from that engine?

did have an off-thought that maybe the mixers are a tad oversize on mine now that it's "only" running 9.25:1 pistons (and composite head gaskets, so mebbe nearer 9.15:1), rather than the 10.5:1 it started out with, and that this is making it difficult to get it running right.

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