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[Ian_D]

I know the Plenums are designed for the engines.

And the 3.0 V6's have a longer plenum than the 2.5's.

What would be the outcome if I fitted a 3.0 Plenum to the 2.5? I'm guessing that it would effect the torque curve? but in what way, I dont know.

[Boracic]

My old 3.0 has the short type, I did wonder if replacing it would make any difference

[tunnie]

3.0 Snooped plenum enabled better breathing for the 3.0, 2.6 had this due to the DBW gubbins it needed, otherwise it would have had the short.

2.5 actually works better with the shorter plenum if i remember correctly, not sure why, just remember DTM saying so

[Andy H]

Generally speaking tuned inlet (or exhaust) systems are longer for lower resonant frequencies and shorter for higher frequencies (or rpm).

It seems plausible that the 2.5 might be able to or need to rev harder than the 3.0 (due to smaller pistons or shorter stroke, can't remember which on the Omega)

[Marks DTM Calib]

Plenum size needs to be proportional to engine cc....hence smaller plenum.

piston and stroke size are smaller on the 2.5

[Ian_D]

Would there be much of a negative impact on fitting a 3.0 plenum to a 2.5?

Reason been is more to do with under bonnet space / layout. However if performance will be effected in an obvious way then I will leave it as is. :-?

[tigers_gonads]

slight hijack of the thred here
but
is they any differance between the 2.5 and the 3ltr (short) plenum ?