Whats the best vtec motor to buildup for power and how much can be expected? Whats the best non-vtec motor for buildup and how much can be expected?
d15b bottom end and a z6 head is a d15b but d15b has better cam.....imo the best vtec d to build is a d16z6 and non vtec is a d16a6.burningwrek said:use pieces from all of them! d15b bottom end, z6 head, y8 intake manifold, blah blah blah
I just said the z6 head because it flows the best out of all the d-series heads. but if someones completely buiding an engine from parts, who's gonna use a stock cam? :TU:BseriesKllR said:d15b bottom end and a z6 head is a d15b but d15b has better cam.....imo the best vtec d to build is a d16z6 and non vtec is a d16a6.
What is the difference between te A6 and the Z6 Girdle ... they looked VERY similar when I compared them...big full length Girdles with lots of meat to support the crank.vtecnitrocrx said:No one has mentioned the quality of the main girdle and crank in the A6 bottom end. They are superior to the Z6 and Y8. The A6 crank has a 45 degree angle cut into the oil holes which increases oiling at higher rpm...kinda works like a chamfer. Z6 head is superior to the Y8 when built to the fullest extent from a flow standpoint but the Y8 has greater detonation resistance due to the non recessed squish areas (otherwise referred to as closed combustion chambers).
Hmmm I just checked spare bare block in the basement ... it is a 92 casting Z6 and the crank has 45 degree chamfers on all the oil-holes in the bearing surfaces ... Hmmm I will have to beg / borrow or steal a A6 crank to compare the two side by side. Perhaps the A6 has a bigger/better chamfer.vtecnitrocrx said:I am absolutely positive about the Z6 versus A6 crank. I have torn down many and the difference is certain. Even in the very early Z6's (92's) they don't have the 45 degree angle in the oil holes. I am certain on that one.
Also I must say that I have had several Z6's with spun #4 rod bearings, I don't think that is an exclusive Y8 issue at all. Even direct from Larry's mouth at Endyn, he puts alot of attention to both of the vtec cranks because of the oiling issues he has seen in both when used in high rpm motors. He has spoken many times on the superior quality of the A6 crank and mains girdle. His experience far surpasses mine, and even aside what I have seen myself, I don't doubt what he says in that area. Plus I am 90% certain that I recall him saying that the A6 girdles are iron. I mean I have been sitting here for 15 minutes contemplating typing that, but I swear that I recall him saying it. I know also, that the A1 bottom ends have the crank with the stock chamfers. As far as the A6 girdle material, I will confirm that tomorrow to be sure. If the magnet sticks though...oh my!
Not easy ... almost no aftermrket support for engine internals ...however you may be able to modify / use some other d-series internal parts, or order some custom Crower rods / JE etc pistons.n_23_s said:What about the d17"s how hard are they to find parts for?