Exhaust Crossovers

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I've read somewhere that crossovers help to remove the spent mixture in the combustion chamber and also assist in pulling the fresh charge in through a scavenging effect. While looking into aftermarket 4-2 full systems, the only one I see out there with a crossover is Marks Pipes. Does anyone else's system have one? What are the real pro's and con's to having or not having a crossover in your exhaust?

 

[4gasem]

I've read somewhere that crossovers help to remove the spent mixture in the combustion chamber and also assist in pulling the fresh charge in through a scavenging effect. While looking into aftermarket 4-2 full systems, the only one I see out there with a crossover is Marks Pipes. Does anyone else's system have one? What are the real pro's and con's to having or not having a crossover in your exhaust?

Having Dale's kit I talked to him about this before buying as his doesn't have one. He said he played with them and NEVER saw any gains from it at all. He ended up spending a year on the Vmax exhaust and if you ask me it shows.

I will say that the crossover gives the exhaust a better tone which also can be said for car exhaust. X piped and H piped cars sound better IMO!

 

[dannymax]

I've read somewhere that crossovers help to remove the spent mixture in the combustion chamber and also assist in pulling the fresh charge in through a scavenging effect. While looking into aftermarket 4-2 full systems, the only one I see out there with a crossover is Marks Pipes. Does anyone else's system have one? What are the real pro's and con's to having or not having a crossover in your exhaust?

My Marving slip-ons have a crossover. They're Italian made, available through Exactrep.

dan

 

[Thevmaxrider]

I asked the same question about the HMF system about a crossover and was told the same thing Chris was, that it has no performance advantage with my exhaust.

 

[Hulign]

Speaking from a car background... I have done tons of performance exhaust setups from full blown drag sleepers to street rods. Placement for a crossover varies for every setup and I truly doubt the optimum placement on the Max is even possible. Given the length of the rear tubes and how timing and flow effect everything. We argued this point for years after side by side dyno testing on a few cars. But they can affect EGT and sound. If improperly placed its jewelry at best. Just like all the guys with dumps and cut outs. Just cause it sounds mean doesn't mean it's working.

BTW one of my favorites was a mid 70s nova 4 door with rusted rear quarters. If you opened the hood it smelled and looked like it leaked oil. He had full new exhaust to the rear end and rusted tail pipes after that. If you opened the trunk there were oil bottles and antifreeze jugs... thing was horrible looking. No cage, just idiot lights and a shift light hidden in a vent. Running the quarter the front tires would just seem to tickle the ground to the 60ft mark.... last I heard was a mid 10 sec time...he got booted from the track for running lower than the roll cage ET. It's been a lot of years but I would love to see that guy on pinks...LOL

Just my 2 cents


Frank

 

[shawn kloker]

I've read somewhere that crossovers help to remove the spent mixture in the combustion chamber and also assist in pulling the fresh charge in through a scavenging effect. While looking into aftermarket 4-2 full systems, the only one I see out there with a crossover is Marks Pipes. Does anyone else's system have one? What are the real pro's and con's to having or not having a crossover in your exhaust?

If power is your main concern,4-1 has the best scavenging.I prefer the 4-2 look but I will end up with a 4-1 eventually.They have to be lighter too.

 

[Jayhawk]

Wait, Chris, you forgot to mention your first choice in pipes - the UFOs! :stir pot: