19bonestock88’s first generation L61 build thread

[19bonestock88]

So, after a while away from this thread, I need to update, as I’ve bought parts and more importantly, a 41K mile long block. I also decided im going to take the head off it and port that one as I know it worked before the engine was pulled from the donor car (have video of it running), rather than go with one that didn’t work last I knew anything. I do now have all the stuff needed to remove the balance shafts entirely, and a 7.5lb aluminum flywheel, snd the better flowing intake manifold from the 2006-2007 2.4. I also have a return style fuel rail for the engine, for later potential use if I decide to throw a turbo on it.

[19bonestock88]

Made some progress on my L61 this weekend. Finally got the rest of the tools to rip it apart and so I have started. I got the head off(bores look great), removed the primary and secondary timing chains and the balance shafts, worked on installing the balance delete kit (requires hammering a tool into the balance shaft holes to shift the bearings to cover the oil holes) and the shorter secondary chain and the custom chain guide.

Afterwards I brought the cylinder head inside and disassembled it, began port work. GM did a phenomenally awful job casting these heads, there are ledges in the ports, causing reversion in the intake side and eddy currents in the exhaust side. My initial cut was just to use a carbide burr to smooth out these ledges, I’m not going for a radical enlarging or reshaping of the ports

[cRiPpLe_rOoStEr]

So, no jackshafts on that balance shaft delete kit? I hate dealing with jackshafts and secondary chains (or belts according to engine type) BTW.

[19bonestock88]

That’s right, the only thing ran by that secondary chain is the water pump. No longer need to time the balance shafts or anything.

I just used a metal pipe and hammer to shift the bearing that the back of the shaft rides on, to block oil flow, and the bushings at the front contain the oil flow that would be lubricating the front balance shaft bearing

[19bonestock88]

So I got in touch with DIYautotune (microsquirt) and I found out that the microsquirt can’t do sequential injection, it can fire them in batches of two.

What’s your guys thoughts on this, related to economy?

[Piotrsko]

On an open plane manifold where everything is drawing fuel, maybe. Otherwise I fear that one of the injectors is just making a fuel puddle on the dual fire.

[19bonestock88]

Originally Posted by Piotrsko

On an open plane manifold where everything is drawing fuel, maybe. Otherwise I fear that one of the injectors is just making a fuel puddle on the dual fire.

That’s what I fear too, the injectors spray directly into the intake ports themselves, it’s a totally dry manifold

[cRiPpLe_rOoStEr]

I'd much rather resort to sequential injection, as the fuel won't have a much longer path to vaporize through.

[19bonestock88]

Originally Posted by cRiPpLe_rOoStEr

I'd much rather resort to sequential injection, as the fuel won't have a much longer path to vaporize through.

Which is why I’m wanting that feature so badly

[cRiPpLe_rOoStEr]

Originally Posted by 19bonestock88

Which is why I’m wanting that feature so badly

You know, with a shorter path for vaporizing, it also ends up enabling to go leaner, and the sequential injection also decreases substantially the raw mixture losses during the valve overlap. It's all benefits.