does anyone know what the factory cam specs look like?
THat is what I first thought. I had an automatic trans LT-1 cam that almost the very same numbers.. Hmmm, 1/2 of an LT-1 engine? I'll take that.Jim Lewis said:Yes, they're metal sticks with funny bumps on them.
Just kidding - it looks like those GM Performance cams have quite a bit higher duration and lift. The specs actually look like a mild Chevy small block cam spec...which is REALLY weird.
Ya know Sp00n, it's getting to the point of rediculousness all the questions from people concerning the 2.0 ECOtec engine as relating to anything 2.2L ECOtec. Honest to GOD people, for all intent and purposes, the 2.0L is the same as a 2.2L minus a little bit of stroke. You can turn a 2.2 into a 2.0L & you can turn a 2.0 into a 2.2L just by swapping parts. It is not like they are different designs like the 2.2ECO is to the 2.4 Twin Cam. Now those are two different engines designs that are not part swappable.Sp00ner said:There are people that know better than me....
The cams in an engine, are not REALLY made for the specific engine, you could put alot of cams in our engine and it would still run fine. Or at least run, the number of the cams are far more telling than the model of engine stamped on the box. Of course some are made with a type of engine in mind, and some are made with a specific engine appliction in mind for high-performance. These guy seem to have a much better grasp on the numbers than I could fake.
The internal differences between our engines are the cranks, rods, pistons, and a few other odds and ends. If the specs on the cams, duration, lift, and those numbers, are good to make power in a supercharged 4-banger, with a 6,500 rpm limit, they'll make power in our engine...
I don't think the bore is different, just the stroke. I believe they it is 86mm for both the 2.0 and 2.2.
I think you hit the nail on my frustration headSp00ner said:I can understand it, alot of people have bolted things on before, and if it dosen't fit, you can usually see it right away. Other people that might not know a ton about cams and valvetrains, might be concerned that the two engines could require cams that look completely opposite to each other, or something. If it's the first 'performance-styled' car that someone has owned, I can see being very careful over something unfamiliar like cam shafts, it SOUNDS like you're really getting into the engine internals.
Everyone just has to understand, cams are cams. There might be some that are better or worse than others, but a cam built for either of the two engines will fit. It's the numbers and specs on the cam that determine the performance, or lack of performance, that the cams will provide. If you put them next to each other, you might be able to see a difference, MIGHT, but either of them will drop right into the car. The ones advertised as a 'blower-grind' are the ones that are designed to go with our engines, because they are a supercharged Ecotec. If you put a blower in the 2.2, then you could use the same cam as we would. On the flip side, if you removed our blower, and made it N/A, you would use one of the 3 that are being called 'the ones for the 2.2'. The only reason they're for the 2.2 (it would be more accurate to call them: Cams for non-forced induction Ecotecs), is because it's not blown or a turbo.
Risky business, but not impossible of course. Even if you wired up the gears, they become "unstable" when you remove them from the cam (hence the tool)BlackLine said:i saw a cam swap on a Ecotec where to keep the cam gears on the chain he ziptied them though those holes and around the chain seems like the same idea for the do it yourselfer.