That 0.069 rod ratio change isn't that great of an effect on the peak piston accelerations nor the instantaneous peak piston speeds. Side loading changes aren't that great either. I will however say it isn't to be ignored. A quick crank-slider model will show you that.
Exactly. I don't think the FA20 is going to be a 9k+ screamer engine but I'll be trying to prove myself wrong. However if I find the engine hitting a brick wall, I'll go down the other shortblock avenues that I've been looking into. I'll be chasing area under the curve, not a high redline.
Exactly and there is always lots to change
I keep my 9.5:1, 4" pistons to 405-410 grams (fluctuates with batches) in 2618. Newer things in the works, which I'll be starting with on the FA20 engine.
Basically, for now I'm working on everything in the shortblock, as it's the only part that I have absolutes on. I'm going to see what the shortblock and manifolds can bring to the table and by that time, their should be some aftermarket camshaft support
I start with shortblock geometry (confinements and limitations), from there I have calculated loads and start with modeling/FEA work. Then it's off to prototype testing...same as always.
Cylinder heads, I have a few potential points of interest and
I really hope that the TGV and plates that extend into the heads don't carry over from the FB!!
-Micah