Quote Originally Posted by DarKStaR View Post
The ls crank gives you more stroke, usually leading to more tq. I think thats what some people mean by "bottom end". The problem with the ls rods are the rod bolts not the bearings from what ive seen and read. And ive never heard of cylinders getting egg shaped by running a lsv over a period of time lol. I can see this happening if your pistons are smaller than the bore and have piston slap....And the b16 pistons will give you a higher compression ratio over the usdm itr's. I havnt heard of anybody having a rough idle from not having their rotating assembly balanced, usually that has to do with the tune. But if it idles rough because of the crank, yo shits fucked up lol.



Somebody correct me if im wrong but the newer oil pumps are the same for type r,gsr, and ls. All the same part number...

edit:zo beat me to it
i read somewhere one pump flowed higher than the others? where i dunno...


as far as the cylinders go, i can't explain it.
http://www.phatwhippincrx.20m.com/custom4.html read away...


The ideal R/S is 1.75:1 (Three cheers for the B16A, at a near-perfect 1.74:1!).


Why a low R/S is bad for reliability


A low R/S means the rod will be closer to a horizontal angle on its upstroke. This means that more of its force will be pushing the piston horizontally, rather than vertically. What does this mean for your engine? Two things.

1. There will be more stress on the sides and in the center of the rod, rather than on its ends, leaving the rod more vulnerable to breaking. Picture a straw. This is no special straw, just an ordinary drinking straw. Is it going to be easier to bend this straw by applying pressure onto its ends, or at its center? Now think of your poor connecting rods.

2. There will be more stress on your cylinder walls. Once again, the rod is pushing the piston at a more horizontal angle- right into your cylinder walls, rather than up and through them. The risk here is double: A. Putting that piston right through the cylinder wall. B. The cylinder wall will actually flex under the pressure, causing the shape to turn from a circle to an oval or oblong shape. This causes the loss of the seal created by the piston rings. What happens? A small amount of oil could slip past into the combustion chamber. Bad things happen from here: The oil gets combusted, leaving nasty carbon deposits in your combustion chamber and exhaust ports- not a good thing for flow or valve sealing.