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Advanced Exhaust Tech II : Backpressure and Area

Posted 07-11-2002 at 12:00 AM by MichaelDelaney

Backpressure: Friend or Foe?

Backpressure can influence in 2 places along the engine cycle: Just at the start of when the exhaust valve opens and at cam overlap.

Figure 1. Pressure measurements at the exhaust valve during the start of the exhaust stroke at BDC to cam overlap at the end of the exhaust stroke & beginning of the intake stroke at TDC.

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Correcting Exhaust B-Pipe Cat Flange Bottleneck

Posted 05-24-2002 at 12:00 AM by MichaelDelaney

On all exhaust Bpipes (including the aftermarket ones) there is a bottleneck at the flange which connects to the cat.

Many people are unaware of this exhaust flow restriction which can hinder the exhaust from extracting the power potential out of the engine.

This is the culprit in question (in this case, it is from an ITR exhaust but all aftermarket exhausts have this bottleneck at the Bpipe flange which connects to the cat):

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Advanced Exhaust Tech I

Posted 02-16-2002 at 12:00 AM by MichaelDelaney

GOALS OF AN ENTIRE EXHAUST SYSTEM The 2 goals of a header-cat-exhaust system (notice I didn't just say exhaust only) is to: a) to efficiently remove as much of the combusted inert exhaust gases out of the cylinder. Remember that burnt exhaust gas is inert or does not combust twice (EGR & fuel economy is another story) and therefore cannot make power if it is in the cylinder...it takes up space in the cylinder and prevents fresh air and fuel from coming into the combustion chamber to make power....
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Header Tech Information (Header Parts & Powerband)

Posted 02-16-2002 at 12:00 AM by MichaelDelaney

A common question I often get on Honda forums is: should I get a 4-2-1 (tri-Y) header or should I get a 4-1?

You may want to understand some basics about header design before making your decision about purchasing one, so that your choice is an informed one. You have to remember that it is called an exhaust SYSTEM. Getting a header without considering how the header fits in with the cat and exhaust could prove to be a mistake you will regret in the future, if the header turns out...
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Cats (Catalytic Converters) with Higher Flow

Posted 02-14-2002 at 12:00 AM by MichaelDelaney






A. Where to Get Them:


Carsound website: http://www.car-sound.com/catalog/universal/935.aspx

This is the cat core without the needed extension tubing, flanges, and O2 sensor bungs. You will need...
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