Anyone using this exhaust?

[Plavan]

I am a little late to this party . Yes I am using the "Stinger". The one I am using was the actual prototype. It works great, sounds awesome and is way more durable than megaphones.

I had Al Reed polish mine. Now it is that cool bronze color. Many VARA racers are using it now.

[RarlyL8]

I didn't think a cross-over was needed in any horizontally opposed or "boxer" engines.

[901/05]

Chad P what ever happened with Frank Becks exhaust system? I heard that it was about to be the best out there for 2.0 cars. Shawn.

[richde]

Originally Posted by RarlyL8

I didn't think a cross-over was needed in any horizontally opposed or "boxer" engines.

That's what I was thinking, the 3-1 collector is what aids in scavenging in my head.

The later, use of identical heat exchangers merging into the Cat was because it's easier, cheaper, and lighter to use only one catalytic converter.

[Plavan]

Originally Posted by 901/05

Chad P what ever happened with Frank Becks exhaust system? I heard that it was about to be the best out there for 2.0 cars. Shawn.

Franks is a very nice exhaust, however I do not feel it is worth the $2.5K. My cousin and uncle have it. There are other options out there without breaking the bank. Mark Scott and I race against other cars with Becks exhaust and they do not pull away from us at all. I guess if you have the cash go for it.

[901/05]

I was not aware of the high price on that item. Thanks greatly for the info.

Best of Luck to you out there. I enjoy watching your track vids. Alot.

Shawn.

[gavinc69]

Check this link out :

http://uk.youtube.com/watch?v=8GaD1RKd_Tw&feature=channel

Looks to be a sort of stinger, I just love the sound.
If anyone knowns what it is and wher to get one let me know ;-)

[Maltese Falcon]

We just put our system on an early 2.2 POC racer for last months Cal Speedway event. Awesome sounds, and the driver reported improved lap times from changing out the 2 megs. These are completely smooth mandrel bent, and not made from u-bends, 16 ga. c/r U.S. steel, and nickle plated . These will be available in January, for less than $200.00. Pelican will also be distributing these .
Marty

[911st]

I am no expert on exhaust but have some thoughts to put out there.

Scavenging and Back Pressure (BP) are the two major factors that effect how well our exhaust system works.

Scavenging can add a “super charge” effect at a given point and increased efficiencies or performance above the norm. The benefit of Scavenging can be greater on a motor with high overlap cams.

Back pressure will slow down the rate of exhaust flow. Slowing down the flow should hurt efficiency at higher rpm. However, at low rpm this might actually help on some motors as it helps keep the exhaust events timed at a more orderly rate for better efficiency.

It sounds like the first use of a cross over it to allow the exhaust events to make room for each other like on an odd fire. Thus, allowing the exhaust to cross over to the other bank would reduce BP on the crowded side.

Could it be that a cross over on an even fire might work to create turbulence at a lower rpm point and thus slow down the flow rate for better efficiency down low. Then still allow for lower back pressure at a higher rpm.

[KTL]

Originally Posted by Maltese Falcon

We just put our system on an early 2.2 POC racer for last months Cal Speedway event. Awesome sounds, and the driver reported improved lap times from changing out the 2 megs. These are completely smooth mandrel bent, and not made from u-bends, 16 ga. c/r U.S. steel, and nickle plated . These will be available in January, for less than $200.00. Pelican will also be distributing these .
Marty

It's January. Are they available yet?

[pcar9119]

I've been wanting to run my exhaust like this for years now. I could never find a system for my SC. I love how it looks. Are they generally an efficient system? Does anybody know?

[pwd72s]

Originally Posted by HarryD

For those of us who are not as exhaust savvy, what is a "crossover" and what does it do?

Thanks!

Harry, on your car, a stock exhaust has a "crossover"...the muffler! 911st here pretty much nailed my understanding of the benefits of a crossover pipe. Hot rod exhausts have been adding crossover pipes, or joing the two sides together with an X pipe for quite some time...

[pwd72s]

Originally Posted by pcar9119

I've been wanting to run my exhaust like this for years now. I could never find a system for my SC. I love how it looks. Are they generally an efficient system? Does anybody know?

On your SC? Assuming it's a stock 3.0? Nothing more efficient that switching to SSI's that I've heard of. Plus, with SSI's, you'd retain the heat in the cabin. Crazy as it may seem, sometimes you can LOSE power in a search for appearance and sound.

(edit) BEWARE of smog laws in your area...backdated exhaust is often frowned upon by bureaucrats.

[rfn026]

Here we go. This was how all of this got started. It was all about Dr. Gas and Sterling Marlin. This article explains the basic concept.

Richard

[mpeastend]

Why did the factory use megaphones on certain race cars w/o crossovers if there are large benefits to be had in additional torque & smooth AFR's? There are many but just for example, the 3.0 RS & RSR. Was this info found out after about 1974 when the factory didn't use motors with megaphones any more?

Also, the weber/phase 9 exhaust seems to be very highly regarded but it doesn't use any crossovers.

[911st]

Read the artical.

What stuck is it lowers back presure after the cross over (at least on an odd fire).

[Bill Verburg]

Originally Posted by mpeastend

Why did the factory use megaphones on certain race cars w/o crossovers if there are large benefits to be had in additional torque & smooth AFR's? There are many but just for example, the 3.0 RS & RSR. Was this info found out after about 1974 when the factory didn't use motors with megaphones any more?

Also, the weber/phase 9 exhaust seems to be very highly regarded but it doesn't use any crossovers.

Again the exhaust needs of an odd fire US 90* V8 are not the same as those of an even fire 180* crankshaft 90* V8, a 180* flat 6 or a 60* V12.

The megaphones tailor the reflected sound waves to the rest of the characteristics of the exhaust to maximise low pressure at the open exhaust ports at peak hp.

[Bill Verburg]

Originally Posted by 911st

Read the artical.

What stuck is it lowers back presure after the cross over (at least on an odd fire).

Yes, you need to keep clear about the fact that a US 90* crank, 90* V, V8 is an odd fire engine

[petevb]

I was going to mention that it is still a matter of debate if a crossover works on a flat 6 or not, and if so under what conditions.

This dyno (stolen from dfink, posted here last week) was interesting:

"Red is with the dynomax exhaust the blue is re-tuned with the straight pipes."

I was surprised that the muffler (with gases mixing/ crossing over) beat the straight pipes, but then the old questions (conditions, correction) muddy the waters. It's still an interesting result...

I hope to dyno my setup in the next couple months with and without a crossover- it will be on a wheels dyno, but at least we'll get another data point.

[911st]

petepv: I think something is up with that info. He noted needing more fuel to correct the AF's with the change to straight pipes but that the muffler made more HP. More air flow plus more fuel with the straight pipes should equal more HP but that was not the case. Also his muffler is an unusual "cross flow" that has exhaust gasses flowing head on to each other as they cross in the muffler. Just not a clean data point I would suspect.