Blew my engine. Anyone here build a 3.8 or 4.0?

[Jake Raby]

The X51 shares the same bottom end and pistons as any other 3.6 engine. It has bigger ports, and larger cams, with a larger intake plenum.

I've never favored X51 engines, even to be built up into our platforms.

[Porsche9]

Originally Posted by Jake Raby

The X51 shares the same bottom end and pistons as any other 3.6 engine. It has bigger ports, and larger cams, with a larger intake plenum.

I've never favored X51 engines, even to be built up into our platforms.

Curious as to why? The changes seems to fall into typical mods a engine builder would use to get more power out of a engine. Does it change the who power is delivered that you do not favor?

[Jake Raby]

Originally Posted by Porsche9

Curious as to why? The changes seems to fall into typical mods a engine builder would use to get more power out of a engine. Does it change the who power is delivered that you do not favor?

Its where and how the power is made. The engines make all their power so high in the RPM range that the hydraulic valve train is the determining factor. The engines don't really start to pull until 6K RPM, and before that they often make less torque than a standard care engine.

The big ports and big cams, with the huge plenums make for an engine that has a narrow power band.

The same characteristics follow the engines, even when they are made larger.