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[The Red Baron]

on a v6, can anyone give a simple explanation as to what it does please.

[Elite Pete]

It operates the zeeko flashback system

[The Red Baron]

It operates the zeeko flashback system

sensible answers on a postcard please.

[TheBoy]

flattens the torque curve

[dbug]

I thought it operated the zeeko flashback system 

[feeutfo]

if not working, increases fuel consumption and loses power below 4k, basickly alters the inlet flow to give low rpm torque and, in conjunction with the second multiram at back of plenum, gives good top end power as well. Fools the inlet flow to give best of bith worlds.

[The Red Baron]

if not working, increases fuel consumption and loses power below 4k, basickly alters the inlet flow to give low rpm torque and, in conjunction with the second multiram at back of plenum, gives good top end power as well. Fools the inlet flow to give best of bith worlds.

thanks for that chris.

[2woody]

this is a bit of a test.......

it's all to do with Organ pipes really.

any air in a pipe will have a resonant frequency, which depends on (amongst other things) the pipe's length.

IF you can organise the pipe so there's a slight high pressure at the ends, then that pressure can spill out

the idea in an engine is that the inlet tract is switchable into three lengths, and at certain speeds the slight high-pressure spills into the cylinders past the valves, causing a mild "supercharging" effect. Longer for lower revs, shorter for higher revs (just like organ pipes)

its exactly the same theory as used for the tuning of exhaust manifold lengths.

that's about the simplest I can make it. Actually, I dod one of my dissertations on this subject - three months of slog, and I only just scratched the surface. One day I'll run all of the calculations for the Omega

[TheBoy]

this is a bit of a test.......

it's all to do with Organ pipes really.

any air in a pipe will have a resonant frequency, which depends on (amongst other things) the pipe's length.

IF you can organise the pipe so there's a slight high pressure at the ends, then that pressure can spill out

the idea in an engine is that the inlet tract is switchable into three lengths, and at certain speeds the slight high-pressure spills into the cylinders past the valves, causing a mild "supercharging" effect. Longer for lower revs, shorter for higher revs (just like organ pipes)

its exactly the same theory as used for the tuning of exhaust manifold lengths.

that's about the simplest I can make it. Actually, I dod one of my dissertations on this subject - three months of slog, and I only just scratched the surface. One day I'll run all of the calculations for the Omega

Hmmm, sounds like fun. Not

[Kevin Wood]

One day I'll run all of the calculations for the Omega

It'd be interesting to look at what can be done with the exhaust on the V6. Having crafted quite a nice induction system, GM seem to have bolted a carbunkle of an exhaust manifold on it.

Maybe it's for packaging reasons, maybe they knew there was little to gain, or maybe the bean counters "engineered" that bit, but it would be nice to know what a nice tubular manifold would do for the engine.

Kevin

[2woody]

cast iron manifold and lagged primaries all there for emissions reasons...

[2woody]

this is a bit of a test.......

it's all to do with Organ pipes really.

any air in a pipe will have a resonant frequency, which depends on (amongst other things) the pipe's length.

IF you can organise the pipe so there's a slight high pressure at the ends, then that pressure can spill out

the idea in an engine is that the inlet tract is switchable into three lengths, and at certain speeds the slight high-pressure spills into the cylinders past the valves, causing a mild "supercharging" effect. Longer for lower revs, shorter for higher revs (just like organ pipes)

its exactly the same theory as used for the tuning of exhaust manifold lengths.

that's about the simplest I can make it. Actually, I dod one of my dissertations on this subject - three months of slog, and I only just scratched the surface. One day I'll run all of the calculations for the Omega

Hmmm, sounds like fun. Not

sesigned a cylinder head for my second one !

[TheBoy]

cast iron manifold and lagged primaries all there for emissions reasons...

I seem to recall on the 2.6/3.2 that they did away with the cast iron manifolds...

[2woody]

yes - that's when they went for the four-cat system. Again for emissions reasons. ( even tighter emissions legislation )