ALFAGTV6.COM

Bruce · Post by **Bruce** » Wed Aug 24, 2005 12:26 pm

....I know they fit but I read somewhere (may be I am wrong) that the primaries are too small for a modified 3 litre.

Mats · Post by **Mats** » Wed Aug 24, 2005 1:11 pm

Ok, I'll be sure to write that down for future reference....

Seb · Post by **Seb** » Thu Aug 25, 2005 1:57 am

There are two sizes of primaries available...

Post by **Zamani** » Thu Aug 25, 2005 9:11 am

Seb,

I think there are 2 SECONDARY sizes (2" or 1.75"), the bigger one called the SV. Primary sizes are all the same, 1.5" ID.

enzo · Post by **enzo** » Thu Aug 25, 2005 12:21 pm

Zamani is right.

Seb · Post by **Seb** » Thu Aug 25, 2005 12:58 pm

OK, I got it backwards then, sorry.
So the primaries are a bit under sized? Good for how many bhp? I´m considering CSC for my 3.0QV engine, will that be sufficent? It´s about 210-215 bhp i think.

Seb

enzo · Post by **enzo** » Thu Aug 25, 2005 1:55 pm

here is a video of a GTV6 3.0 with CSC headers making over 260HP on the dyno (still running l-jet

)

http://www.alfarumore.com/events/Leistu ... -1sten.MPG

http://www.alfarumore.com/events/Leistu ... -262PS.MPG

videos are over 60MB...

Post by **Zamani** » Thu Aug 25, 2005 2:52 pm

You mean a stock GTV6 3.0 with 9.5:1 pistons and maybe S-cams getting 260PS? What was the reading at the wheels?

enzo · Post by **enzo** » Thu Aug 25, 2005 10:54 pm

no, not very stock

ported heads, higher compression, S-cams, complete CSC SV exhaust...
i will look if i can post the graph of the MAHA dyno....

Mats · Post by **Mats** » Thu Aug 25, 2005 11:57 pm

I wonder how many hp it would produce with proper (bigger) sized primaries...

Seb · Post by **Seb** » Fri Aug 26, 2005 12:13 am

I just got some new info from EB spares in England. The CSC "big bore" headers are 5mm bigger in the PRIMARIES!:-) This is what he wrote:
The big bore is designed for 3.0 with extra power, but it means you have to fit the complete system to match! Its only 5mm bigger on the primary pipes, so not that much bigger.
If you only want to fit the manifold std bore is fine.

The primaries width (all three togeahter) should still be less of a resitance than the secondary, so I wonder if the primary dimention is really a problem. (?)

Just a thought...

Seb

Mats · Post by **Mats** » Fri Aug 26, 2005 1:14 am

You can't just add area for the primaries and compare to the sacondary, the exhaust gasses arrive to the secondary pipe in evenly spaced pulses so it does not require 3xprimary area.

Seb · Post by **Seb** » Fri Aug 26, 2005 1:25 am

true...

enzo · Post by **enzo** » Fri Aug 26, 2005 3:00 am

here the graph

Mats · Post by **Mats** » Fri Aug 26, 2005 4:11 am

Hmm, from the top:

-Torque
-Engine Hp
-Wheel HP
-Losses

Is that right?

323Nm???

daaaamn... The dyno-sheet says it's a 2.5 though.