boring

[ranger]

how much of a difference would it make to get the 2.9 bored 30 over. how much hp will i gain

 

[jaymegriffiths]

how much of a difference would it make to get the 2.9 bored 30 over. how much hp will i gain

4.0 swap its cheaper.

 

[holyford86]

little to none, I would guess .5 - 1.0 hp and I'm betting I'm being optimistic

 

[Psychopete]

how much of a difference would it make to get the 2.9 bored 30 over. how much hp will i gain

Not much. You won't get a lot of extra displacement by increasing the bore only.

Pete

 

[Cyberbeer]

Not to mention the extra heat you create by boring the cyl walls. It'd be a wash in the end.

 

[IRKillroy]

extra heat for .030 over?! the walls aren't that thin!

the displacement will increase only a little bit without stroking the engine you don't see HP gains in boring out an engine. especially an engine that has a very short stroke like the 2.8/2.9l engine family (that's why is has so much low end torque... well that and the long intake runners)... I can't recall the stroke but it's like really short... I'm gonna be stupid and say 3.5 inches.

 

[shadetree]

2.9 engine dimensions are - 3.66X2.83. If you bore .030 over, you will never know you did anything.shady

 

[tanbuddy]

i calculated it, your only gonna get 3 extra cubic inchesm or .05 liter.