exhaust pulses

[lovemylantra]

what type of reflector do you need? and where in the downstream would i need to put this? rotoman youd be suprised what i know =) i cant get my point across as well on the internet compared to in person but i do understand what you were trying to tell me in the last thread about if i open the throttle to quick im gonna loose power ... thats why once i install it im gonna have to adapt to a new way of accelerating which is fine ... but i guess its always good to look at both sides of the picture before entering into something. since you brought this up i wanted to know how one could do so?

[RotaMan99]

Glad you understand. :) Many don't and many come across looking like morons.

[jalmir]

I guess I should've followed another topic to understand any of this??

[joph09]

by reflector do you mean silencer?

[KeWLKaT]

Find me a reason to keep this thread open.

What is the reflector you are talking about?

P.S. Next time keep that other 90% of the orignial post in a PM form if you have something to tell a member.

[RotaMan99]

I had a whole post typed up but then I lost it. GRRR. So let me try to explain again and try remember what I typed...

I don't know what reflector your talking about. The only "reflection" I know of is the technology that goes into mufflers to cancel out noise.

With exhaust pulses there is a high pressure side and a low pressure side. The obvious fact here is that the high pressure front on the rear pulse will be pulled into the low pressure rear side of the front pulse.

When deciding on an exhaust system you need to think about what you have done to the engine right now. Reason for that is because the more air that enters the engine, the more air that needs to leave the engine so a more high flow exhaust will help out.

Exhaust systems can really only be built to obtain power in a certain range of RPM. Say 3000-4000 or 4000-6000 or 5000-6000. It all depends on how the exhaust pulses are lining up which highly depends on the length of the primary tubes in a header. Now you can go all out and have multiple headers made of different lengths to get the power in the range you want but thats going to get expensive.

The size of the secondary piping is crucial as well since you don't want to go to big if your not expelling a lot of exhaust. This will depend on valve duration and extention, porting and also exhaust velocity.

Velocity in the exhaust system is very important because this helps keep the exhaust pulse going and continues to create a vaccum that can pull the exhaust out of the combustion chamber even after the piston has passed TDC and is moving back down.

I never had to look into 4-1 or 4-2-1 headers before since I only delt with 2 exhaust ports for 6 years so 2-1 headers are what I had to look into. I can only imagine that a 4-1 header would be more free flowing than a 4-2-1 header but the question is, do you really need your exhaust to be that free flowing? It seems 4-2-1 gives a good all round gain unlike a 4-1 which would give you more top end and less on the low end. 4-2-1 would also be good for engines just starting to be worked on. 4-1 would be good for engines that already have the intake side of the engine worked on.