Even More Obscure Question About My Obscure Motor

I've been doing some more research on swapping out the 1.5L Daewoo for the 2.0L. The good news is that it seems the bigger engine is underrated at 132 hp, the mounts interchange, both engines use identical ECUs and the exhaust is only a little bit different. Looking at sensors, it seems that as long as I get the engine from some first world country, even the wiring is a direct swap.

The stuff that's different seems to be concentrated around the intake. The EGR is different, the intake manifold is radically different and it seems that the fuel rail mounts backwards on the 2.0L.

Here are pictures.

2.0L

1.5L

I was thinking about just swapping the 1.5 manifold/egr/intake/fuel rail onto the 2.0L. This seems easier, and if we do this then hopefully my students can do some porting to make the smaller manifold match up to the bigger cylinder head ports.

But looking at the two manifolds, it appears the 1.5 manifold is designed to give the tiny engine some torque, with very long runners and variable geometry.

Here's the 1.5 intake:

If I swap this on, even with some porting, do you think it's likely I'll end up strangling the larger engine at high rpm? The 1.5 uses the exact same intake as the Aveo 1.6, btw.

Well, from first glance the runners look pretty long. Tough to fix without making a new one from scratch, though, unless you can weld whatever material that is.

It's aluminum. Wonder what would happen if I cut a few inches out of the runners? Hmm ...

Does anybody with Aveo experience know how the stock manifold flows on the 1.6?

MrBenjamonkey wrote: It's aluminum. Wonder what would happen if I cut a few inches out of the runners? Hmm ... Does anybody with Aveo experience know how the stock manifold flows on the 1.6?

Get a few spares and some dyno time. Make different iterations. That's innovation instead of just bolting stuff on. Post results!

Ditto!!! Aluminum welds okay; give it a shot!

Aluminum welds fine but remember 2 things, the filler metal is pure aluminum and therefore not as strong as the base material and 2 you will lose your heat treat in that area.

Other than that go for it!

Motorcycle ITBs and a Megasquirt shipped in from Estados Unidos.

John Brown wrote: Motorcycle ITBs and a Megasquirt shipped in from Estados Unidos.

i don't understand the fascination with ITBs. yes, they look cool. no, they do not make torque at reasonable RPM.

AngryCorvair wrote:

John Brown wrote: Motorcycle ITBs and a Megasquirt shipped in from Estados Unidos.

i don't understand the fascination with ITBs. yes, they look cool. no, they do not make torque at reasonable RPM.

No... not at a reasonable rpm... but are any of the people on this forum reasonable? lol

For me ITBs made sense for a more responsive motor, sure their may be a slight increase in torque but not enough to really amount to a whole lot.

John Brown wrote: Motorcycle ITBs and a Megasquirt shipped in from Estados Unidos.

More importantly, he's trying to avoid an aftermarket EFI set up.

cxhb wrote: For me ITBs made sense for a more responsive motor, sure their may be a slight increase in torque but not enough to really amount to a whole lot.

on a 2.7L flat 6, my simulations showed well into the double-digit percentages with intake runner length as the primary variable, changing valve events and exhaust lengths to optimize output for each intake runner length that I tried.

I'm thinking of buying two spare intakes, both in the 1.5L style. That way I can get one team of munchkins making a "torque" manifold and another team making a "horsepower" manifold. Then hopefully we can try both and keep whichever works better. Or, if they both work, swap them back and forth for track duty and autocross.