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Please play nicely.  No one wants to listen/read a keyboard warriors rants....

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Author Topic: cylinder heads  (Read 1649 times)

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sassanach

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cylinder heads
« on: 22 May 2007, 20:30:09 »
what is the difference if any between 2.5 heads and 3 litre heads?
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palmer3914

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Re: cylinder heads
« Reply #1 on: 22 May 2007, 20:58:04 »
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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now thats a DIFF!!!!!!!!!!

Marks DTM Calib

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Re: cylinder heads
« Reply #2 on: 22 May 2007, 21:06:44 »
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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TheBoy

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Re: cylinder heads
« Reply #3 on: 22 May 2007, 21:07:00 »
Different volume, sodium filled valves...
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TheBoy

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Re: cylinder heads
« Reply #4 on: 22 May 2007, 21:07:33 »
Damn, MDTM beat me....   ....and he had a more thorough answer...
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palmer3914

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Re: cylinder heads
« Reply #5 on: 23 May 2007, 09:57:10 »
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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now thats a DIFF!!!!!!!!!!

Kevin Wood

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Re: cylinder heads
« Reply #6 on: 23 May 2007, 11:36:28 »
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
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