the rods are the same, it's the crank that reduces the piston travel (displacement)
Cherub (AZ) wrote:the rods are the same, it's the crank that reduces the piston travel (displacement)
correct.
I was a retard, and now I'm permanently banned.
Few more questions...
Which pistons would be best for a N/A ecotec?
Weisco, Diamond, or LSJ pistons? Or is the LSJ pistons same as the Diamond?
The handbook says to use 10.1 (91octane) compression for N/A applications, and 8.1 for supercharged.
On carcustoms is says that both are good for either.
If a 10.1 is good for both then I could use 10.1 and later on add supercharger, without changing the pistons?
What is your opinions?
so the LSJ rods are a direct swap? interesting
1989 Turbo Trans Am #82, 2007 Cobalt SS G85
Yea, so are the pistons. The bare blocks are the exact same. Technically, you can take a L61 block and replace all the parts and make it in to a LSJ. It's just buying all the parts would cost more than buying a whole LSJ motor. I spent one boring day at work looking up parts & numbers in the parts dept.
I'm not sure if you could swap a LSJ head on to a L61 block though. The complete heads for each engine is different.
That site is nice. I'm not sure if that's the actual "Ecotec Handbook" or what.
you better double check those rods. the 2.0L has a bore and stroke of 86X86 while the 2.2L has a bore and stroke of 86X95-96 not quite sure but its right around that. pistons should have the same dimensions but the rods would have to be different to accomadate the shorter stroke of the 2.0L. the blocks are the same between the ecos. meaning that a 2.2 could be made into a 2.0 buy swapping cranks and rods, pistons shouldnt matter as far as fit, but c/r would be diff and strength.
Don't steal, the government doesn't like competition
I quote the new gm ecotec build book:
"The 2.0L LSJ Ecotec engine has forged steel rods ... These rods are available through GM under part number 12755126.
These rods require GM Performance Parts piston set part number 88958634 to work with the stock 2.2L crankshaft.
hope this helps.
Quote:
Which pistons would be best for a N/A ecotec?
Weisco, Diamond, or LSJ pistons? Or is the LSJ pistons same as the Diamond
for N/A you want higher compression. pop top/dome will be it. it will put you somewhere 11's compression wise. any type of forged piston is a good choice. weisco, JE its all good.
The crank has a shorter stroke, the block is the same so the rod -piston lenght is DIFF in the two motors --So they use a special piston to make up the diff in lenght when using the 2 liter forged rod.
Thanks everyone for the input.
Rob, thanks for the part numbers. Is that site i posted at the top the ecotec handbook, or something else?
Remember, the LSJ are I believe 9:1 compression or something to that nature. If you have an N/A application, lowering the compression will take away power that you need. With N/A you want a higher compression.
Quote:
the rods are the same
Technically they aren't. The Rods from the 2.0 motor are forged, the 2.2 motor's isn't. That's why the list it up to 400 HP that the rods can handle. The 2.2 is listed to about 280 HP. FYI, the pistons are forged also.
They should be a direct replacement swap.
Also, if you are looking for N/A power, de-stroking wouldn't help. Bigger displacement = more power (in our case).
Quote:
Which pistons would be best for a N/A ecotec?
Weisco, Diamond, or LSJ pistons? Or is the LSJ pistons same as the Diamond
I would say call up Weisco to get a high compression piston like 11:1 or something of that nature.
www.kronosperformance.com / 732-742-8837
If you look at the Photo of the rod&piston You can see how the Pin has been moved up in the GM performance piston to compensate for the lenght diff.
Thanks NJ.
Thanks rob for clearing that up for me.
Thanks to everyone for their posts.
Xian G wrote:Thanks NJ.
Your Welcome
www.kronosperformance.com / 732-742-8837
