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will a 2.5l 8v head fit a 3.0l 8v na engine.

 
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coconutcowboy  



Joined: 27 May 2003
Posts: 191
Location: Milner, Ga

PostPosted: Tue Jul 29, 2003 10:07 am    Post subject: will a 2.5l 8v head fit a 3.0l 8v na engine. Reply with quote

was looking for cubic inches for my 944 and was wondering since I found a semi complete 3.0 at the yard today in a totalled 944 near where I got my 2l shortblock.


appears to have damaged some ancilliaries but the rest is still cocooned in the wreckage.

any thoughts welcome.

Sean Ross
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84 944 2.5l NA for sale.

80 924 w/ turbo nose/ m471 option/ ac and Pasha Interior. w/ bursch header and exhaust, stage 2 cam, Audi wur and tb

ricer's shall kneel before the mighty Porsche or unforgivable harm shall befall their engine blocks.
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Lizard  



Joined: 03 Nov 2002
Posts: 9364
Location: Abbotsford BC. Canada

PostPosted: Tue Jul 29, 2003 11:44 am    Post subject: Reply with quote

the 3.0L was a 16v unit only IIRC, and according to www.powerhaus.com a 3.0L 16valve head can be mated to 2.5l 944 block, so I see no reason that a 2.5l 8 valve head couldn't be mated, but it would require some machining to the water and oil ports where the head and block meet
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CBass  



Joined: 03 Nov 2002
Posts: 2807
Location: Vancouver, Canada

PostPosted: Wed Aug 13, 2003 4:51 am    Post subject: Reply with quote

You'd be best off using the 16V head, it's a much better head than the 8V.
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Joes924Racer  



Joined: 03 Nov 2002
Posts: 11964
Location: Oregon, Denver Colorado native!

PostPosted: Wed Aug 13, 2003 5:24 am    Post subject: Reply with quote

Aahh I think he knows that.
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1979 porsche 924 Na
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hotrodder  



Joined: 16 Sep 2003
Posts: 6

PostPosted: Tue Sep 16, 2003 6:10 am    Post subject: Reply with quote

The 2.5 l head will restrict the 3 l motor to 2.5 l performance pretty much, will it not... hence theres no point doing it
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Lizard  



Joined: 03 Nov 2002
Posts: 9364
Location: Abbotsford BC. Canada

PostPosted: Tue Sep 16, 2003 11:54 am    Post subject: Reply with quote

hotrodder wrote:
The 2.5 l head will restrict the 3 l motor to 2.5 l performance pretty much, will it not... hence theres no point doing it

it will lower performance abit but not down to the 2.5L performance
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Alex Roy  



Joined: 03 Nov 2002
Posts: 694
Location: Springfield Oregon USA

PostPosted: Tue Sep 16, 2003 1:19 pm    Post subject: Reply with quote

Um....wouldn't that just be exactly the same as boring and stroking a 2.5 engine....it would definitely up performance.
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78porsche924  



Joined: 14 Dec 2002
Posts: 1217
Location: Newark, DE(near where DE,MD and PA meets)

PostPosted: Sat Sep 20, 2003 7:06 pm    Post subject: Reply with quote

I don't think it will fit period, because the bore on the 3L is much larger than that of the 2.5L
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Nick Neves  



Joined: 03 Nov 2002
Posts: 32
Location: Livermore, CA 94550

PostPosted: Fri Oct 31, 2003 3:54 am    Post subject: recipe for sleeper soup Reply with quote

hi guys,
the bore on the 3.0 is not the real problem, it's the cylinder spacing. On the 3.0 and 2.7 motors, they had to essentially spread the 4 individual cylinders out a tiny bit to make the bore the size they wanted and still have enough room inbetween each piston for reliability. I do like the idea of a 3 liter 8v, though--more reliable(the dohc heads had issues with the intermediate chain and have a lot more moving parts) and quite the sleeper. The only problem is you would need to use an s2 short block with a 1989 944 head, kinda rare. You would also need to use the 89 pistons, because they have the same bore as the s2, but have the valve cutouts for the 8v head. Put this combo together and you should be looking at about a 25% increase in power, and a healthy leap in torque thanks to the longer stroke. And from the outside it will look like a normal 944. ...ahh.... if only I worked at Parts Heaven
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