Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: sassanach on 22 May 2007, 20:30:09
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what is the difference if any between 2.5 heads and 3 litre heads?
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dont hold me to this :-[
BUT
not an awefull lot ...... from what i have heard if you put 2.5 heads on a 3.0 it will heighten comprssion ratio a little .....
BUT again
I have also been told 3.0 have bigger valve's ...... :-/ and without ever having a 2.5v6 head to compare i still odnt know rea;lly.
BUT what i do know ....
3.2 heads are the same as 3.0- heads ??? :-?........ not that it helps you though.. :'(
we will see what others say..
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Valve sizes are the same although the 3.0 has sodium filled exhaust valves.....the 2.5 has smaller bowls and when fitted to a 3.0 give a VERY high compresion ratio (high 11's), if the 3.0 heads are fitted to the 2.5, you would get a lower compression ratio (low 9's)
So, they are not realy interchangeable......
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Different volume, sodium filled valves...
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Damn, MDTM beat me.... ....and he had a more thorough answer...
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cool!!! learn a new thing everyday...... SO basically i need to get myself some 2.5 V6 heads for my MV6 track car!!!!!!!!!!!!! awesome :y
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I think when JamesV6CDX was thinking about using his 2.5 heads on the 3.0 we calculated that the compression would end up at over 12:1 :o. This would obviously make fuel choice rather critical, might even require forged pistons and wouldn't be worthwhile on a road car but a track car is a bit of a different proposition.
It would be interesting to try it and see what the gains are, but it's not exactly a quick job!
Kevin