What is boring and stroking an engine?

[BigNazty114]

I've heard about bored and stroked engines, but I don't know what that means. Can anyone give me a definition?

[Hatch]

to 'bore' an engine you increase the diameter of the cylinder and to 'stroke' an engine you change the length of the connecting rod to play with the length of the stroke

simple explination but i hope this was what you are looking for

Jeff

[.tony. .riot.]

Originally posted by Hatch
to 'bore' an engine you increase the diameter of the cylinder and to 'stroke' an engine you change the length of the connecting rod to play with the length of the stroke

simple explination but i hope this was what you are looking for

Jeff

And what does that accomplish?

[88 LE]

Originally posted by Hatch
to 'bore' an engine you increase the diameter of the cylinder and to 'stroke' an engine you change the length of the connecting rod to play with the length of the stroke

Correct on bore.

Wrong about stroke. Stroke is related to the crank.

Lets say you shorten or lengthen the rod, but keep the crank the same. All your doing is moving the piston up or down and changing the compression ratio, stroke stays the same.

[Hatch]

Yes sorry my bad however when you do stroke an engine you will still have to adjust the connecting rod

[alltrac165]

Originally posted by .tony. .riot.
And what does that accomplish?

Going up on bore or stroke gives you more displacement, which is the same as making your engine bigger. Stroking emphasizes torque, and boring tends to emphasize HP. Generally, anyway.

[SmokingTires]

Man, stroking is fun. I'm doing it right now! wait! j/k






88LE, you do need adjusted rods when you stroke your engine. Along with drilling to allow for the stroked crank to fit properly, and many other factors that don't seem important to mention in this format

[88 LE]

^ I know. I'm not a noob when it comes to engines.

All I was saying is that, if you keep the crank the same and change the length of the rods, the stroke stays the same.

In other words the crank determines the amount of stroke.

[SmokingTires]

Originally posted by 88 LE
^ I know. I'm not a noob when it comes to engines.

All I was saying is that, if you keep the crank the same and change the length of the rods, the stroke stays the same.

In other words the crank determines the amount of stroke.

I know your not.

I just needed a moment of having self-esteem. But you had to go and wreck that didn't you?

[88 LE]

Originally posted by SmokingTiresV6
I just needed a moment of having self-esteem. But you had to go and wreck that didn't you?

Nah....

If it makes you feel any better, go skool some noobs in the Camry section. Thats what I do.

[SmokingTires]

Originally posted by 88 LE
Nah....

If it makes you feel any better, go skool some noobs in the Camry section. Thats what I do.

But you always get there first! I work 3pm to 2am. I'm not home in time to have any of the real fun. Eh, I guess. But it gets old schoolin' people on intakes.

We need to ban that word from the forum

[Mighty~Mart]

but why would a person bore the throttle body?

[homeguard]

smaller strokes = higher rpm but less torque right?

[SmokingTires]

Originally posted by Mighty~Mart
but why would a person bore the throttle body?

You bore the throttle body to allow more air/fuel mixture into the engine.

Originally posted by homeguard
smaller strokes = higher rpm but less torque right?

Nope. RPM stays the same. You may be able to push it a little more, but I wouldn't do it.

88LE might no more about the RPM change...

As for torque, you gain torque by stroking over your engine. Which is the reason muscle cars do it so often. It brings some major low-end gains.

[chronoti]

Originally posted by homeguard
smaller strokes = higher rpm but less torque right?

rpm's are controlled more by the cams and springs, really good titaninum springs and cams grinded down right can let you hit higher rpm's, also how the head was built determins part of that, computer and also type (rotary compleatly diffrent system)