Here, we will investigate the characteristics of this engine by referring to the data of the EJ-VE type naturally aspirated engine installed in Toyota’s M100A type duet 1.0V 2004/04 model.
EJ-VE Engine type naturally aspirated specifications
Toyota’s Duet Type M100A
|Vehicle model||UA-M100A type|
|Car name & grade||Duet |
|Inner diameter × stroke||72.0mm×81.0mm|
|Bore stroke ratio||1.12|
|Single cylinder volume||329.8cc|
|Intake method||Naturally aspirated|
|use fuel||Regular gasoline|
First of all, as a basic structure, the EJ type engine is a long stroke type engine with a bore (inner diameter) of 72.0 mm, a stroke (stroke) of 81.0 mm, and a bore stroke ratio of 1.12 (the stroke amount is larger than the piston diameter).
When the displacement and the number of cylinders are the same, the engine has better torque characteristics in the low rpm range than the short stroke type and is easy to handle, but in the high rpm range, the filling efficiency deteriorates and the sliding resistance increases. There is a concern that the output will drop.
Moreover, when the number of revolutions is the same, the average piston speed tends to be higher than that of the short stroke type, so the load on the engine tends to be heavier.
On this site, the model equipped with the EJ-VE type naturally aspirated engine is the first duet [M100A type | 2004/04] released from 1998/09 , and there are 4 NA models, turbo / All 4 models of 0 models are registered as SC cars.
Evaluation from the viewpoint of transient characteristics and liter equivalent horsepower
|Image of engine performance curve|
|Changes in horsepower||48.2PS → 64PS|
|Transition of torque||9.6kgm → 7.6kgm|
Duet’s in-line 3-cylinder 989cc engine with a compression ratio of 10.0 and regular gasoline specifications, which is the reference vehicle for this time, produces a maximum output of 64 horsepower at 6000 rpm and a maximum torque of 9.6 kgm at 6000 rpm.
If you know the horsepower and the number of revolutions, you can know the torque, and if you know the torque and the number of revolutions, you can know the horsepower. The torque at 6000 rpm is 7.6 kgm.
The horsepower per liter of displacement is 64.71PS / L and the torque is 9.7kgm / L. The horsepower per cylinder (single cylinder volume 329.8cc) is 21.3PS and the torque is 3.2kgm.
When the EJ naturally aspirated engine is applied to a 10-step evaluation based on deviation values aggregated from all NA vehicles registered on this site, the evaluation is ” slightly ” with a converted horsepower of [ 4 ] and a converted torque of [ 6 ]. It is categorized as ” engine with modest output “.
Displacement increase, compression ratio increase, bore stroke ratio change
|Normal displacement and compression ratio|
|Bore||Stroke||Displacement||Compression ratio||B/S ratio|
|Displacement expansion by bore up|
|Displacement expansion by increasing stroke|
There are three factors that determine the engine displacement: the number of cylinders, the bore diameter, and the stroke amount. By increasing or decreasing these, engines with various displacements are created.
Here, regardless of whether it is actually possible, the displacement when the piston diameter is expanded from the genuine 72.0 mm to 75.0 mm in 0.5 mm increments and when the stroke is extended from the genuine 81.0 mm to 86.0 mm in 1 mm increments. And, the change of the compression ratio when it is assumed that the combustion chamber volume does not change is listed.
* It is easy to say stroke up, but if you want to make a long stroke, you need a crankshaft and a compatible connecting rod, and if you can not divert it, you have to make it in one-off, so it is expensive anyway. It is a menu that requires considerable preparedness to put out.
Regarding the compression ratio, in most cases, the uneven capacity of the top surface of the piston changes as the diameter of the piston increases, so the compression ratio values in the list do not match, but the displacement. Please enjoy the atmosphere that the compression ratio will naturally increase as you increase the size.
The B / S ratio is an abbreviation for the bore stroke ratio, and as the bore diameter is widened, the characteristics of the long stroke type, square type, or short stroke type are approached. In the case of EJ type engine, the ratio changes from 1.12 to 1.08 when the bore is increased by +3.0mm from the genuine piston.
Increased displacement with engines with similar piston diameters
There are 45 engines with pistons that are close in size to the piston diameter of 72.0 mm of the EJ type engine, so as a side note, let’s calculate the displacement when the bore is raised by diversion of the piston.
|Eg type||Piston diameter||Displacement|
For engines with similar piston diameters, Honda: L15B type 1496cc 73.0mm mounted on GK5 type Fit, Mitsubishi: K12C type 1242cc 73.0mm mounted on ZC83S type Delica D: 2, Honda: mounted on RU3 type Vezel LEB type 1496cc 73.0mm, Honda: L15A type 1496cc 73.0mm mounted on GE8 type fit, Mitsubishi: K12B type 1242cc 73.0mm mounted on ZC72S type Delica D: 2, Honda: ZF2 type CR- The LEA type 1496cc 73.0mm mounted on the Z is applicable.
(Although the number of people who find pleasure in such a quest has decreased) No matter how close the diameter is, there are factors such as the diameter of the piston pin, the height of the piston, and the convenience of valve recess, so if possible, the same manufacturer, If possible, if you choose the same fuel and the same intake method, and if possible, the one with a similar displacement, the possibility of genuine diversion may increase.
Average piston speed
Next, let’s look at the average piston speed. The average piston speed at 6000 rpm, where an engine with a stroke of 81.0 mm produces maximum output, is 16.2 m / s , which is a piston speed that travels a distance of 16.2 meters per second (58.3 km / h at speed). It means that is moving up and down.
The average speed is 17.6 m / s at 3600 rpm, which generates the maximum torque, and 17.6 m / s when 6500 rpm, which is 500 rpm higher than the 6000 rpm where the maximum output is generated, is assumed to be the rev limit.
For reference, I calculated the change in piston speed when an EJ engine with a stroke of 81.0 mm is rotated up to 10000 rpm. Looking at this, it seems that the speed increases by approximately 5.40 m / s as the number of revolutions increases by 2000 revolutions.
Considering only 20.0 m / s, which is a guideline for general engines assuming mass production, it is mechanical to set the upper limit of high rpm to about 7410 rpm (whether it rotates or not). It seems to be preferred both mentally.