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07-10-2007, 08:31 PM
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I have quite a few sets of manifolds and the inlets and outlet sizes are exactly the same (allowing for normal production variations) on 3.0 and 2.5 manifolds. There MAY be an internal size difference on some 3.0 manifolds where the three branches come together.
Greg Gordon,
www.hiperformancestore.com |
07-11-2007, 01:03 AM
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 Quote:
Originally Posted by Greg Gordon
I have quite a few sets of manifolds and the inlets and outlet sizes are exactly the same (allowing for normal production variations) on 3.0 and 2.5 manifolds. There MAY be an internal size difference on some 3.0 manifolds where the three branches come together.
Greg Gordon,
www.hiperformancestore.com |
Quote:
Originally Posted by Potenziato
The 3.0 ones I have taken off look bigger than the 2.5 ones. Of course, sometimes the 3.0 ones have been swapped for 2.5 manifolds along the life of the car..
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07-11-2007, 05:48 AM
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Quote:
Originally Posted by ULTRALINK A75
The answer is .... sometimes the 3.0 ones have been swapped for 2.5 manifolds along the life of the car..
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I'm sure this debate will rage on for years  .
Kevin
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86 Spider Veloce
87 Verde
Milano registry custodian( www.alfamilano.com)
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07-11-2007, 06:44 AM
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I am not exactly new at this, I was smart enough to check the part numbers when I measure the holes. The 3.0 manifolds I checked were correct 3.0 manifolds, not 2.5 manifolds off a 3.0 engine.
I am not saying that these 3.0 manifolds with larger inlets and outlets don't exist. Knowing the way Alfa changes things, it wouldn't shock me if the do. However I haven't seen them.
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07-11-2007, 12:33 PM
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RAGs, to get back to your original question before the hot debate started, I was poking around e-bay and found these if you are still looking:
http://cgi.ebay.com/ebaymotors/Alfa-...mZ120136945704
Kevin
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86 Spider Veloce
87 Verde
Milano registry custodian( www.alfamilano.com)
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07-11-2007, 01:14 PM
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Alfisti
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Location: Mebane, North Carolina (Don't ask!)
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Kevin,
Thanks for the reality check ... 
I actually won such a bid yesterday, and the manifolds should be on their way. As JJ mentioned, the numbers are different 116*** for the 2.5 and 195*** for the 3.0. As my experiement showed there was much more volume within the 3.0 so ...
Found a good deal for less than $50 including shipping!!!
Thanks all. |
05-05-2008, 11:28 PM
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Sorry to resurrect an old debate but I just have to ask this question: Assuming there is no way to determine the difference between the 3.0L & 2.5L exhaust manifolds by the Alfa Romeo part numbers cast into them and the by inlet and outlet diameters.
A) How does one tell the difference between the two types of manifolds?
B)Is it just urban myth that the 3.0L manifolds have a larger volume vs the 2.5L ones? Anyone have any data points on this?
Thanks in advance!
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Timo
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05-06-2008, 01:27 AM
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I guess only the Verdes in San Jose have larger exhaust manifold then!
I'll have to change my statement and say that MY verde has larger id piping in the branches than MY platinum did (and not by a small amount either).
Timo, this thread is pretty new, you can read what members have posted here and draw your own conclusions. I have no doubt that the manifold Greg found were the same size. It's just a matter of Alfa being Alfa it seems. If you think about it, why waste good materials?? Does BMW or Audi just throw their excess 2.5 liter exhaust manifolds away when they decide ton do a displacement increase?? (I'm joking.)
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1987 Milano Platinum - check for many new items. PARTING OUT
1989 Verde - Harsh shocks and SS rears, 27mm torsion bars, stainless lines, pads, 16X7.5 rims, 4.10 rebuilt platinum tranny, poly bushes, and RSR 28mm front and 25.4mm adjustable sways!
1984 GTV-6 - 80K miles
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05-06-2008, 08:11 AM
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Quote:
Originally Posted by Grant
Timo, this thread is pretty new, you can read what members have posted here and draw your own conclusions.
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The thread may be "pretty new" but I from what I understand the debate is fairly old. Drawing one's own conclusion, such a novel idea. 
The reason I asked this question regarding the 3.0L vs 2.5L manifold size difference is that I purchased a spare pair of what are supposed to be 3.0L manifolds and I want to make sure that they are in fact the "larger" version. Other than part numbers I have nothing to compare them to because the other 3.0L manifolds are of course installed on the engine.
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Timo
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05-06-2008, 08:11 AM
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The easiest way to check is to fill it with fluid and measure the volume.
Greg
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05-06-2008, 09:52 AM
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Here is a pic of a real 3.0 manifold drivers side. The 3 to 1 merge is much bigger. The number reads 195.46.09.703.00.
Maybe I can get Grant to take off a 2.5 and compare it to this 3.0 manifold to end the debate.
The parts CD rom I have shows a different part number for the 2.5 than any 3.0. The 3.0 have two different numbers whether they have the cat. or not. The cars with the cat have the spacer under the manifold so this shows for USA 83 spec and Potenziato.
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Louis
1987 75 RS 24V
1987 Milano Verde ex RS Racing Special (1st RS kit in USA!!!)
2004 BMW M3
2002 Porsche Boxster
Last edited by Potenziato; 05-06-2008 at 10:08 AM.
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05-06-2008, 10:16 AM
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Louis, I have my 2.5 passenger's side off of the car already. Do you have a passenger side 3.0 handy?
Also, the manifolds on my 3 liter seem to make more power Xp
__________________
1987 Milano Platinum - check for many new items. PARTING OUT
1989 Verde - Harsh shocks and SS rears, 27mm torsion bars, stainless lines, pads, 16X7.5 rims, 4.10 rebuilt platinum tranny, poly bushes, and RSR 28mm front and 25.4mm adjustable sways!
1984 GTV-6 - 80K miles
Last edited by Grant; 05-06-2008 at 10:21 AM.
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05-06-2008, 01:39 PM
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Do you guys have graduated beakers so you know exactly what the difference will be? I.e. not "half a cupfull" or "about half a Denny's coffee mug" sort of units |
05-06-2008, 01:50 PM
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I do, I will measure a set next week and post the results.
Greg
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05-06-2008, 02:07 PM
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Quote:
Originally Posted by nizam
Do you guys have graduated beakers so you know exactly what the difference will be? I.e. not "half a cupfull" or "about half a Denny's coffee mug" sort of units |
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Louis
1987 75 RS 24V
1987 Milano Verde ex RS Racing Special (1st RS kit in USA!!!)
2004 BMW M3
2002 Porsche Boxster
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