Optimizing Intake Design: Pressure Wave Tuning for Improved Engine Performance

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    Pressure Tuning Wave
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Discussion Overview

The discussion centers around the design of a custom intake system for an 8-cylinder internal combustion engine (ICE), specifically focusing on tuning the pressure wave in the intake port to enhance engine performance. Participants explore the challenges of developing equations or methods to predict the behavior of pressure waves based on various parameters such as cross-sectional area, pipe length, and plenum volume.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant, Todd, seeks assistance in designing an intake system that optimizes the timing of pressure waves arriving at the intake valve to improve volumetric efficiency.
  • Another participant mentions that developing a reliable equation for predicting pressure wave frequency is challenging and often requires experimental methods using a dyno.
  • Todd expresses frustration with existing literature, noting that many resources repeat similar formulas primarily applicable to four-cylinder engines and lack sufficient physics content.
  • A suggestion is made to refer to a specific book by Charles Fayette Taylor, which is described as a more academic resource on internal combustion engines.

Areas of Agreement / Disagreement

Participants appear to share a common understanding of the challenges in developing a theoretical framework for pressure wave tuning, but there is no consensus on the availability of adequate resources or methods to achieve this for an 8-cylinder engine.

Contextual Notes

Participants note limitations in existing literature, including a lack of physics and the applicability of formulas primarily for four-cylinder engines. There is also mention of the dependence on experimental methods for tuning, which may not provide a straightforward theoretical approach.

USMC8541
I need some help.

I would like to design a custom intake for a 8 cylinder IC engine.

some back ground information.

All cylinders are fed by a length of pipe with a tapering crossectional area (intake port). All 8 intake ports are connected to a common plenum.


What I am trying to accomplish is to tune the pressure wave in the intake port to arrive at the intake valve at a pre determined moment. The reasoning is if the + pressure wave arrives at the valve just before the valve closes the momentum of the air will continue to flow into the cylinder aiding in volumetric efficiency.

I am having a rough time developling an equation or method using crossectional area, varing crossectional areas, pipe length, and plenum volume to accurately predict the frequency of the + positive pressure wave.

If I haven't given enough background information let me know or ask me what you need to know and I can go more indepth.

Todd
 
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I am having a rough time developling an equation or method using crossectional area, varing crossectional areas, pipe length, and plenum volume to accurately predict the frequency of the + positive pressure wave.
Many people have had a hard time developing such a formula. Most often, ram tuning is done experimentally with a good machine shop and a dyno.

The formulas that do exist can be found in a book like "Internal Combustion Engine in Theory and Practice: (2 volumes) by Charles Fayette Taylor. Look for it at Amazon or other bookseller.
 
Thanks Krab for you reply.

I have about 15 ICE books. But if you notice they copy someone elses work majority are repeats of each other with slightly different spins on them. The formulas in the books are for four cylinders only. They don't tell you that in the books. I had to do some research to find out what size engine it was for.

I know you could do it with a dyno and flowbenches and so on but it would be a lot easier, cheaper and faster if I a had reasonable starting point.

Todd
 
I have about 15 ICE books

There are lots and lots of books on the ICE. The vast majority have little or no physics in them, and as you note, they copy each other's formulas, and I'm guessing the authors don't really understand them. The book by Taylor is totally different; it is the only Academic book on ICE's I've run across. Look it up. It really is worthwhile.
 

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