photos of exhaust systems

joescoolcustoms · Posted: Thu Jan 06, 2011 9:51 pm Post subject:

I have read a lot of mistakes about header performance in this thread.

If all you are looking for is to stick an exhaust on a engine and have ground clearance, pick any you see on this thread. If you are looking for a performance enhancing exhaust, get a true equal length, 4 into 1 in sequence header.

The dual cannons perform worse than the 4 into 1 system because they lack a true scavenge effect making it hard to tune a dual set of carbs or an engine with a longer duration cam.

The tubes need to be the same length to be a true header. The length of the tube helps effect where the torque band is, somewhat. It will move it about 200 RPM's up or down. The shorter the primary tube, the higher the torque band.

Now the scavenging effect is a little harder to grasp. Scavenging effect is when the exhaust leaves the head port and creates a vacumn on the engine port which helps start pulling the intake charge into the cylinder when the two valves are open when overlapping as the exhaust valve is shutting and the intake valve is opening. To get this scavenging effect the primary tubes should all come together into the collector in firing order sequence. In sequence means that if you look into the collector and see the primary tubes, they should fire in a order that creates a circle effect which will even pressure and create a vortex that enhances the vacumn pulled on each tube. Only the higher quality header makers take the time to get this right. The scavenging effect in the cylinder also pulls some of the new intake charge past the exhaust valve giving a cooling effect on the valve, helping longevity and performance.

The reason the dual cannons perform less than the 4 into 1 headers is the fact that when firing, the cannons fire two cylinders next to each other and than pause for two cylinders to fire on the other side. (firing order of 1432 is really 43, 21, 43, 21....) This fire, fire, wait, wait slows down the exhaust, intrupting the scavenging effect and gives a horrible pulse effect to dual carbs.

Coating the header makes a performance enhancement too. The ceramic coatings were developed to hold the heat in the tube, not for corrosion resistance and looks, at first. The coating keeps the exhaust heat in the exhaust. This is important because as a gas cools, it shrinks. When it shrinks in the header primary tube, it looses velocity slowing down. Slowing down exhaust looses some of the scavenging effect. Maintaining the velocity of the exhaust gas is the main reason for the ceramic coatings.

So, if your head hurts after reading my babble, I understand.

The key points about a header are:
1. They are primarily to create scavenging on the cylinders
2. True headers have equal length primary tubes
3. Best headers are 4 into 1 and fire in a circle sequence in the collector
4. Coatings help the heat to stay in the exhaust gas and increase the scavenging effect
_________________
Bad News Racing 2018 NORRA 1000 3rd in Class
Best Day Ever Racing 2022 NORRA 1000 2nd in Class and first All Female team to complete the race

Everyone is gifted. Some just do not open the package.

Looks like it was painted with a live chicken,polished with a brick and buffed with a pine cone

tanner_122 · Posted: Thu Jan 06, 2011 11:08 pm Post subject:

JonF · Posted: Fri Jan 07, 2011 4:16 am Post subject:

what about the bobtail style exhaust? anyone run one? or got a photo of one?
_________________
68 bug 1600sp 30/31
68 baja 1600sp 010 32ndix

sloboatnova · Posted: Fri Jan 07, 2011 6:43 am Post subject:

Blu Bug · Posted: Fri Jan 07, 2011 9:07 pm Post subject:

Image may have been reduced in size. Click image to view fullscreen.

[/img]

Here's my exhaust. I tucked it away behind my bumper cage to keep it out of harms way and to keep people from being burned.

kyle_pc_75 · Posted: Fri Jan 07, 2011 10:41 pm Post subject:

Simple, out of the way:

Nevermind that this is a carnage pic:

Kyle

thefladge · Posted: Sat Jan 08, 2011 10:10 am Post subject:

This is the best picture I could find of my exhaust system. It's an S&S Headers Baja exhaust. The muffler is safe inside the bumper cage, although the cage was removed at the time I took this picture.

This is a picture is from a year or so back. I've removed the Zenith carb and installed dual 40 IDFs since then.

_________________
1957 Vintage Baja Bug.
2110cc engine, 40 IDF Webers on Gene Berg manifolds, Engle 110 cam, Bugpack 40×35.5 Street Pro Heads, W8CC plugs, 12.5 pound Flywheel, Kennedy 1700 pound pressure plate.

2RL · Samba Member Joined: May 02, 2010 Posts: 177

not exactly the greatest photo of an exhaust system here.... but you get the idea . its a quiet pack with spark arrestor.

ugly buggy · Samba Member Joined: May 18, 2006 Posts: 47

[/img]

ugly buggy · Samba Member Joined: May 18, 2006 Posts: 47

Here's another view

bad69baja · Posted: Sat Jan 08, 2011 12:52 pm Post subject:

JonF · Posted: Sat Jan 08, 2011 1:27 pm Post subject:

ugly buggy is that a sidewinder?
_________________
68 bug 1600sp 30/31
68 baja 1600sp 010 32ndix

bajaherbie · Posted: Sat Jan 08, 2011 1:32 pm Post subject:

looks like a sidewinder with a custom u-bend(big) and a magnaflow? muffler..
_________________
blank

ugly buggy · Samba Member Joined: May 18, 2006 Posts: 47

bajaherbie & JonF,
If your asking is it a Manx Sidewinder ... nope
We ended up with with a few of these units that were a marketing test. The one in the pics was shortened just before the collector. The unit is not tuned in that it's not sequential with the firing order. That's a SS 2.25" tube in to a 2.25 "Hushpower SS" muffler. It gives the setup a deep mellow tune.

MnC

aircooled356 · Posted: Sat Jan 08, 2011 7:23 pm Post subject:

How about this?


Hello! Log in or Register \| Help \| Donate \| Buy Shirts	See all banner ads \| Advertise on TheSamba.com

	Forum Index -> HBB Off-Road	All times are Mountain Standard Time/Pacific Daylight Savings Time Page: Previous 1, 2, 3, 4 Next
Page 2 of 4