# Trans4motor - Engine Simulator

> Interactive 4-stroke engine simulator with customizable configurations and sound. (iPhone/iPad app by Kitt Peak, Inc..)

- Source: https://appshunter.io/ios/app/trans4motor-engine-simulator/id899277186 (this page in markdown: same URL + `.md`)
- Developer: [Kitt Peak, Inc.](https://appshunter.io/developer/399507326)
- Category: Education, Entertainment
- Price: $2.99 with in-app purchases
- Rating: 3.70/5 from 70 App Store ratings · 113 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.0 · 24 MB
- Languages: American English, Japanese
- Released: 2014-07-29
- Data updated: 2026-08-26
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/trans4motor-engine-simulator/id899277186/reviews.md

## What is Trans4motor?

Trans4motor is a simulator where you can control the movements of single cylinder to 12 cylinder 4 stroke engines on the iPad/iPhone.
Recommended to anyone interested in car and motorcycle engines. This is for those who have a relentless love for engines and want to enhance their knowledge.
#3 Top Paid iPad App in Japan
#5 Top Paid iPhone App in Japan

https://www.youtube.com/user/Trans4motor
https://www.facebook.com/Trans4motor

Features
1) Seamlessly transforms into different type of engines

Select from inline to V-type, or other multi-cylinder engines,
and watch the running engines transform over continuous CG animation.

Enjoy watching the inline engine camshaft separate into two parts as it transforms into the V-type engine and 
how phase angle modulation between cylinders makes the crankshaft rotate, separate, and combine into many engine formations.


2) Add Engine Sound (In-App Purchase)

Developed in technical collaboration with "CAI MEDIA CO.,LTD.", the developer of the iPhone app featuring innovative synthetic engine sound, "RealEngineSim" this new feature will add a variety of realistic engine sounds ranging from different number of cylinders to explosions with unequal intervals and cylinder rest.
Engine Sound Add-On is available via In-App Purchase.


3) Accelerator Control

Accelerator control is available during engine sound replay. Tilt iPhone to different degrees as if pressing the accelerator pedal. Tilt forward horizontally (as if pressing the accelerator) to activate the accelerator, and erect vertically (as if releasing the accelerator) to deactivate it.
Furthermore, you can race the engine by tapping the center of rev counter.


4) Addition/expansion of engines

There are currently 22 types of engines registered. Through automatic network updates, continuous expansion is planned.

In addition, there are functions installed that allow users to newly register and edit engines.

Able to adjust setting for engine bore stroke, firing order, and ignition timing.
Easily replicate on the iPad, engines with unequal combustion intervals for two-wheelers, Inline-four crossplane or V5.


5) Interactive Movie

·Four-stroke engines
·Firing Order
·V Angle
Recorded 3 controllable presentation videos.


The company and product names used within the application are generally registered trademarks or trademarks of the respective companies.
The objective of this application is to upload engine specifications disclosed to the public and to learn about general information regarding engines.
It does not accurately replicate actual machine measurements and designs.
The CG animated engine rotates at one tenth of the actual speed to enable users to learn the structure and to enjoy the visual.

## Key features

- Multi-cylinder engine transformation
- Realistic engine sound (in-app purchase)
- Accelerator control simulation
- Expandable engine library
- Custom engine registration and editing
- Interactive educational videos

## Pricing and in-app purchases

Base price: $2.99.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Add Engine Sound | $1.99 | one-time |


## Recent user reviews (10 of 113)

All indexed reviews: https://appshunter.io/ios/app/trans4motor-engine-simulator/id899277186/reviews.md

### 3/5 — バルブ数を増減させたい

*2026-08-13*

エンジンの構造を説明するのにちょうど良いアプリ｡バルブ数を5バルブや3バルブに変更できるといいです｡上位版のRの方も設定出来ない感じです

### 3/5 — 最新のバージョンにならない

*2026-01-01*

現状バージョン2.2.1なのだが、2.3にするのはどうすればいいのか？

### 1/5 — 1 Stern nur weiß keine null gibt

*2025-12-18, version 2.3*

Sound kostet extra und bauen kannst du da gar nichts kannst dir nur schlechte Simulationen von Motoren Anhörens der größte Anteil der Bauteile fehlt

### 5/5 — Very great but…

*2025-11-29*

Hi there, I was wondering if you can allow us to have to more rotor configs as 1, 3, 5, 6, and 12 rotors exist, I was also wondering if you could let us have W engines, VR engines, and H engines along with U and X engines, I was also wondering if you could add tuning like turbos, superchargers, intakes, exhausts, and more! if the dev reads this, thanks

Please add them cause I wanna see more engines and engine mods :D

### 1/5 — クラッシュどうにかして欲しい

*2025-08-01*

自分でエンジンを作った際に保存するとそのままクラッシュして　もともと作っていたものなどの場合はクラッシュすると全て消えるのがとても迷惑です


クラッシュどうにかしてください

### 5/5 — Add 2-Strokes!

*2024-06-11*

I would love if y’all would add 2-strokes as a next update. I know that this app has probably already stopped doing updates, but it would be a big upgrade!

### 4/5 — 音以外はまあいい

*2024-03-30*

実車のサウンドも使って欲しいです

### 2/5 — Rpm gauge

*2024-03-26, version 2.3*

Rpm gauge is so inaccurate please fix

### 2/5 — うーん………

*2024-01-30, version 2.3*

普通に見てて面白いが以下の点がイマイチ。
①、バンク角180°のV型エンジンが作れない
この設定のものを作ろうとすると必ず水平対向エンジンになる。バンク角180°のV型エンジンは国鉄のDML30系列など採用実績があるのでこれに関しては確実に実装していただきたい。
②、ボア径とストロークに上限がある
そもそもこのアプリはガソリンエンジンを作ることを目的にしているようなので仕方ないとは思うが、ボア径とストロークに上限があるのは残念。教育目的なら極端に各数値を大きくした時にどうなるかなども見れると良いと考える。
③、ガソリンエンジン以外が作れない
これはあくまで個人的な意見ではあるが、ディーゼルや焼玉といった他のエンジンも作れるといいと思う。直噴だけではなく予燃焼室式や渦流室式などもできるとより楽しさが向上すると思う。
総じて考えるとこのアプリは有料で入れるには割高かなといった印象……

### 2/5 — Not worth it

*2023-11-04*

Interesting, but its not an engineering tool, not worth the money.

## Frequently asked questions about Trans4motor

### What does Trans4motor do?

Trans4motor is an interactive simulator that allows users to control and visualize the movements of single to 12-cylinder 4-stroke engines on their iPad or iPhone. It provides detailed CG animations to help users understand engine structure and operation.

### What are the key features of Trans4motor?

Key features include the seamless transformation between different engine types (inline to V-type), the option to add realistic engine sounds via in-app purchase, accelerator control simulation, an expandable engine library with 22 registered types, and the ability for users to register and edit their own engines.

### How much does Trans4motor cost?

The base application is free. However, additional realistic engine sounds are available as an in-app purchase. The app has been a top-ranked paid app in Japan, suggesting a paid model for the core experience or significant in-app purchases.

### What kind of engines can I simulate?

The simulator supports single-cylinder to 12-cylinder 4-stroke engines. Currently, there are 22 types registered, with plans for continuous expansion. Users can also register and edit their own engines, adjusting settings like bore stroke, firing order, and ignition timing.

### Who is this app recommended for?

This app is recommended for anyone interested in car and motorcycle engines, especially those with a strong passion for engines who wish to enhance their knowledge. It's also suitable for students or enthusiasts looking to visualize complex engine mechanics.

## Version history (last 5 releases)

### 2.3.1 — 2026-01-20

Minor bug fixes. We have also released the latest title, "Trans4motor R," which expands on this concept to include a transmission. If you are considering a new purchase, please check out the latest title for its significantly expanded features.

### 2.3 — 2021-11-11

HONDA NR Oval piston engine supported.

### 2.2.1 — 2021-10-09

Ready and optimized for iPad mini 6 (2021).

### 2.2 — 2017-11-12

This app has been updated by Apple to display the Apple Watch app icon.

Ready and optimized for iPhone X.

### 2.1 — 2015-12-07

Ducati Desmodromic engines supported.

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## More apps by Kitt Peak, Inc.

- [Trans4motor S](https://appshunter.io/ios/app/trans4motor-s/id1561448237)
- [Endless PiP](https://appshunter.io/ios/app/endless-pip/id1617492426)
- [Prism4music](https://appshunter.io/ios/app/prism4music/id6504075908)
- [Trans4motor R](https://appshunter.io/ios/app/trans4motor-r/id6739180076)

All apps by Kitt Peak, Inc.: https://appshunter.io/developer/399507326

## Related topics

[engine building](https://appshunter.io/ios/topics/engine-building) · [building simulator engine](https://appshunter.io/ios/topics/building-simulator-engine)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-26.*