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Old 11-18-2007, 01:53 PM   #21
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During the exhaust stroke, a good way for an engine to lose power is through back pressure. The exhaust valve opens at the beginning of the exhaust stroke, and then the piston pushes the exhaust gases out of the cylinder. If there is any amount of resistance that the piston has to push against to force the exhaust gases out, power is wasted. Using two exhaust valves rather than one improves the flow by making the hole that the exhaust gases travel through larger.

In a normal engine, once the exhaust gases exit the cylinder they end up in the exhaust manifold. In a four-cylinder or eight-cylinder engine, there are four cylinders using the same manifold. From the manifold, the exhaust gases flow into one pipe toward the **catalytic converter and the *muffler. It turns out that the manifold can be an important source of back pressure because exhaust gases from one cylinder build up pressure in the manifold that affects the next cylinder that uses the manifold.

The idea behind an exhaust header is to eliminate the manifold's back pressure. Instead of a common manifold that all of the cylinders share, each cylinder gets its own exhaust pipe. These pipes come together in a larger pipe called the collector. The individual pipes are cut and bent so that each one is the same length as the others. By making them the same length, it guarantees that each cylinder's exhaust gases arrive in the collector spaced out equally so there is no back pressure generated by the cylinders sharing the collector.
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Old 11-19-2007, 05:47 AM   #22
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Quote:
Originally Posted by Revelation Z28 View Post
well LT1s are known to pop on engine braking mostly due to firing order.

small blocks have had that firing order since 1955
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Old 11-20-2007, 02:15 AM   #23
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well LT1s are known to pop on engine braking mostly due to firing order.
1,8,4,3,6,5,7,2, since 1955
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Old 11-20-2007, 02:53 AM   #24
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1,8,4,3,6,5,7,2, since 1955
im talking about the switch to gen III firing order.
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Old 11-20-2007, 10:46 AM   #25
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Originally Posted by Revelation Z28 View Post
im talking about the switch to gen III firing order.
That would be the LS1 you did say LT1
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Old 11-20-2007, 11:30 AM   #26
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im talking about the switch to gen III firing order.
still the same firing order 1,8,4,3,6,5,7,2
ls1 is
1,8,7,2,6,5,4,3
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Old 11-20-2007, 12:08 PM   #27
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open headers is the sweetest sound I ever heard. Everybody at work thought my car was nasty when I let them hear it. Thats the impression I want from people, but cops didnt think it was pleasing to listen to my car
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Old 11-20-2007, 03:23 PM   #28
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open headers is the sweetest sound I ever heard. Everybody at work thought my car was nasty when I let them hear it. Thats the impression I want from people, but cops didnt think it was pleasing to listen to my car
So what your trying to say is..u rather be "ALL SHOW NO GO"
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Old 11-20-2007, 03:30 PM   #29
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That would be the LS1 you did say LT1
yea but what im saying is LS1s dont pop on engine braking. ours do it, probably due to the firing order. seems like the LSx firing order smooths out downrevving.
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Old 11-20-2007, 09:22 PM   #30
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Since where on the topic of headers... Would it be bad to run a stock ls1 motor without any O2sensors for a race event this weekend? On my old motor if a o2 went bad at a race I could continue, but My low end (Under 3k) would suck. Is this the same with LS1's? Ill be mostly in the range of 4k to 6k RPM...
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I drive the ever loving **** out of my car. Just because I dont drive it on the street doesnt mean it doesnt get the SHIT beat out of it when i drive it. I spent more time above 100mph last sunday that 95% of the people on this forum will in the next year.
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Old 11-20-2007, 09:33 PM   #31
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front O2? don't run without it, rear, no big deal
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Old 11-20-2007, 09:53 PM   #32
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front O2? don't run without it, rear, no big deal
When my front 02's failed I was at the strip and my times dropped wayy off, it ran very slow. And it started smelling like pure gas.
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Old 11-20-2007, 09:56 PM   #33
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When my front 02's failed I was at the strip and my times dropped wayy off, it ran very slow. And it started smelling like pure gas.
Yep, if he tries to run without a front it will probably go into limp mode and run rich as hell, it can be unhealthy rich. To race like that is a very bad idea.
If it is a rear O2 he is talking about he should be fine witout it, he'll just have an SES light
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Old 11-20-2007, 09:57 PM   #34
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GO Speed density and dont bother with them...
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Old 11-20-2007, 10:11 PM   #35
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GO Speed density and dont bother with them...
Maybe you should take into account where he lives and how much the temperature varies, if he drives through many altitude changes very often on road trips, etc. It's not always a viable option to go SD
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Old 11-20-2007, 10:20 PM   #36
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Ok. So Im finishing my exhaust tomorrow and thursday and Im shooting them to the side of my fenders. Im sure I get the materials to put the o2's on the fronts. now would it be ok if I didnt get the car tuned?
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I drive the ever loving **** out of my car. Just because I dont drive it on the street doesnt mean it doesnt get the SHIT beat out of it when i drive it. I spent more time above 100mph last sunday that 95% of the people on this forum will in the next year.
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Old 11-20-2007, 10:32 PM   #37
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Are you going from stock exhaust to the setup you are talking about? You'll be fine without a tune, but you'll have a service engine soon light due to the lack of rear O2s and cats if that's the route you are going. It will likely run a little rich, but not dangerously bad
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Old 11-20-2007, 10:37 PM   #38
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Thanks
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I drive the ever loving **** out of my car. Just because I dont drive it on the street doesnt mean it doesnt get the SHIT beat out of it when i drive it. I spent more time above 100mph last sunday that 95% of the people on this forum will in the next year.
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Old 11-20-2007, 10:40 PM   #39
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Maybe you should take into account where he lives and how much the temperature varies, if he drives through many altitude changes very often on road trips, etc. It's not always a viable option to go SD
True, but SD isn't as temperamental as people make it out to be, he would be just fine at various altitudes as long as they are not drastic. He should be more worried about a summer and a winter tune if going SD. Although Vegas doesn't see much of a winter, lol.
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Old 11-21-2007, 12:31 PM   #40
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So what your trying to say is..u rather be "ALL SHOW NO GO"
where in the world did you read that open headers is no go? and it's deffinately not for show, I was just admiring the tone of open headers. no need to be a dick head about it
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Old 11-21-2007, 12:31 PM
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