Venturi collectors.
08-07-2006, 11:37 PM
#2
They work quite well on minimum back pressure race cars. Everyone in drag racing (pro stock) and NASCAR uses them. I have seen some reports of good results, but again, it's always in minimum back pressure exhaust systems. I'm afraid that with catalytic converters and mufflers you won't see any gain from them.
10-23-2014, 02:07 AM
#5
10hp more?
Now that I've addressed the OP's question, can I ask my own question and hi-jack this old thread ?
What is the typical degree angle of the venturi on a merge collector ?
I'm getting a pipe order together for my exhaust system. I want to go from a 3" collector to 3 1/2" pipe. I have a choice of three venturi. A 13* that is 2.2" long, a 9* that is 3.2" long and a 7* that is 4.1" long. Which one would be better ?
10-23-2014, 06:31 AM
#6
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I used 7 degree when I built the collectors for my headers. Are you going to build velocity spikes also? I bought a kit from Cone Engineering and cut off the the collectors on my speed eng 1 7/8 headers and welded on the Cone merge collectors.
They are definitely worth power and work best with big overlap cams and a free flowing exhaust.
They are definitely worth power and work best with big overlap cams and a free flowing exhaust.
10-23-2014, 02:27 PM
#7
I was hoping someone would say 7 degree because the 4.1" would work well in the space I have.
Pharcyde50, I already have headers. Pic attached. They have a velocity spike formed by the 18* merge bends. The distance from the spike to the V-band is less than 3" and I can make enough room to transition to 3.5" so I thought that would put the venturi close enough to enhance the Bernoulli effect.
I am thinking about a reverse-split cam around 231/230 111+0 with 8 to 10 overlap.
Have you heard of a program called PipeMax ?
Pharcyde50, I already have headers. Pic attached. They have a velocity spike formed by the 18* merge bends. The distance from the spike to the V-band is less than 3" and I can make enough room to transition to 3.5" so I thought that would put the venturi close enough to enhance the Bernoulli effect.
I am thinking about a reverse-split cam around 231/230 111+0 with 8 to 10 overlap.
Have you heard of a program called PipeMax ?
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10-23-2014, 06:11 PM
#9
From what I've read, when you have a really good exhaust the LS6 intake/ 75mm TB becomes the bottleneck. Search "Torro" and look for a dyno graph from Chris1313 for a El Torro cam.
I was hoping someone with PipeMax could help me with collector length.
I was hoping someone with PipeMax could help me with collector length.
