Inline 4 Engines: Balance and Vibrations

TL;DR

Getting right the slider-crank mechanism (2D) via MBSD to later form a 3D ICE I4 Vibration Simulation

Intro

https://www.youtube.com/watch?v=ABzKNvJCl28 http://firsttimeprogrammer.blogspot.com/2015/02/crankshaft-connecting-rod-and-piston.html

$$ \begin{aligned} \nabla \cdot \mathbf{E} &= \frac{\rho}{\varepsilon_0} \ \nabla \cdot \mathbf{B} &= 0 \ \nabla \times \mathbf{E} &= -\frac{\partial \mathbf{B}}{\partial t} \ \nabla \times \mathbf{B} &= \mu_0 \left( \mathbf{J} + \varepsilon_0 \frac{\partial \mathbf{E}}{\partial t} \right) \end{aligned} $$

Engine Balance

Balance…what is it?

Vibrations? Forces?

This channel has awsome videos explaining engine balance

I just wanted to create my engine balance simulations as proof:

#git clone https://github.com/JAlcocerT/mbsd
cd ./mbsd

You might do this without a mbsd framework like the one ive built.

Just…make the magic of the model and equation happen.

You got x4 slider-cranks connected to a common axis

So you can model it as one axis that receives variable forces (the reaction ones that makes the crank stay in position) over time as it rotates

cd ./mbsd/2D-Dynamics
make run-slider-crank-no-gravity

Inline 4

After all of this modelling: how about visualizing?

Conclusions

Consulting Services

Consulting - Tier of Service

DIY via ebooks

Distilled knowledge via web/ooks to enable you to create

About Engine Balance

Then provide a summary and pros and cons of the balance of each engine type discussed

The video titled “ENGINE BALANCE: Inline 6 vs. V6 vs. VR6 vs. Flat / Boxer 6” discusses the engine balance, strengths, and weaknesses of four popular six-cylinder engine configurations: the inline six, the V6, the VR6, and the flat six.

Here are the summaries and pros and cons of each engine type discussed:

Inline 6: This engine configuration is simple and balanced.

It only needs one cylinder head, one or two cams, and one exhaust manifold. However, its length is a downside as it’s difficult to fit transversely in an engine bay. It’s hard to fault the inline six other than its length.

Pros: Simple design, beautifully balanced, even firing interval. Cons: Its length makes it difficult to fit in some engine bays. V6: The V6 was created to address the length issue of the inline six. It’s shorter and easier to fit transversely in an engine bay. However, it loses the inherent primary balance of the inline six and needs engineering aids like balancing shafts or crankshaft counterweights to achieve smoothness.

Pros: Compact design, easier to fit in engine bays. Cons: Loses inherent primary balance of inline six, needs engineering aids for smoothness, more complex with double the number of cylinder heads, cams, and exhaust manifolds compared to inline six. VR6: The VR6 is essentially a V6 but with an extremely narrow angle between the banks. It’s compact like a V6 but without the double cylinder heads, cams, exhaust manifolds, and other components, while preserving the inherent balanced nature of the inline six.

Pros: Compact, better balanced than a generic V6, simpler than a V6. Cons: Not as simple as an inline six, needs slanted pistons and additional crankshaft counterweights, differences in length between intake and exhaust ports can result in different power and torque curves. Flat / Boxer 6: The flat six, or more accurately a boxer six, is perfectly balanced and has a very short and light crankshaft. However, it’s the most complex engine configuration of all four discussed and is difficult to package due to its width.

Pros: Perfectly balanced, light crankshaft, rev-happy engine. Cons: Most complex engine configuration, difficult to package due to its width, most expensive and complex engine to manufacture. In conclusion, each engine type has its own strengths and weaknesses. The inline six is simple and balanced but long, the V6 is compact but less balanced, the VR6 is a compact and simpler version of a V6 but not as simple as an inline six, and the flat/boxer six is perfectly balanced and light but complex and wide.

Primary Balance

Secondary Balance

Blame it to the boogie Archimedes.

Some time ago I recorded this video in a restaurant:

FAQ

Cars for Track Days?

Some say that the BMW z4 e86 is underated.

You have ~2007 units for ~10k$ as shown here

Im well aware that some people do cool stuff on the tracks with their bmw (BMW e86).