EbuetAmecus wrote:Tommy Cookers, what is gas load balance ? is this firing balance ? is it not well balanced because of the non natural 65° angle instead of 72 ?
Thanks
the H section con rod design was originated (in the Wright Duplex Cyclone aka R-3350) due to the asymmetry of gas load
I believe this means load due to combustion
at c 18000 rpm why would combustion start and remain perfectly centered throughout expansion ?
the rate of travel of the combustion pressure eg laterally, contributing to spreading the pressure evenly across the piston crown ....
is not much faster than the reciprocation
we know that this generation of N/A F1 engines had rather large ratios of rod length to stroke (due to large crankpin dia etc ?)
maybe this helped wrt piston rocking and side force
a straight 5 is rather well balanced so the V angle in a V 10 affects firing intervals but has little effect on balance
(for balance there is no 'magic' V angle for the V10, unlike the 90 deg angle that is compelling in the usual V8 etc)
Renault's 67 deg means only that the firing intervals are slightly uneven, this has a very small effect on the crankshaft design
(in F1 80+ deg, even 90 deg V 10s, having less even firing intervals, crankshaft design was demanding wrt firing order etc)