367 vs 410 Engines Masters
I was thinking in relation to this thread how we judge intake and cam changes etc.. that give up bottom end for top end and mostly seen as which do you want more bottom end power vs top end power but regearing for the change is seldom brought up as a solution for both, I think it's a possibility we all know but is seldom bring up in that discussion for why I have no idea. So unless changing gearing rear and or trans is no go. That so call loss of bottom should be easily at least minimized, if top end rpm and especially with a decent power improvement should be no problem.
Now this is a Chev 383 long runner tune port vs short runner point is not engine but the curves.
A lot would see that big loss of torque to be too much even for the power gains and extended rpm gains especially in the street.
Say we got 28" tires a 2.45 1st and 3.55 gears with the long runner now and thinking about switching to the short runners.
If we look at where both engines make 350 hp there about 500 rpms apart 3500 rpm vs 4000 rpm. The 3.55 will turn about 3500 rpms with no converter slip factored in at 33.5 mph for the short runner engine to turn 4000 rpms at 33.5 mph so they both would be making similar hp at 33.5 mph they would now need 4.06 rear gears or a 2.80 1st gear or some combination of different rear and trans gears that made a total 9.95:1 in 1st vs the 8.70:1.
When the long runner engine is at 2500 rpms the short runner 4.06 would be at 2860 rpm making 10-15 more hp than the long runner. They would be both making 400 hp at 38 mph and from then on the short running would dominate it as it would rocket up to it's 50 hp gain, so from 200-400 hp the curves would be similar and above that the short runner would dominate if regeared. That huge torque bump would basically vanish once you factored torque to the ground.
And yes you could run deeper gears with the long runner engine but without the extra rpm and hp to back it up it's just gonna run out of rpm and hp sooner so whatever you run with the longer runner the short runner can go deeper.
I was thinking in relation to this thread how we judge intake and cam changes etc.. that give up bottom end for top end and mostly seen as which do you want more bottom end power vs top end power but regearing for the change is seldom brought up as a solution for both, I think it's a possibility we all know but is seldom bring up in that discussion for why I have no idea. So unless changing gearing rear and or trans is no go. That so call loss of bottom should be easily at least minimized, if top end rpm and especially with a decent power improvement should be no problem.
Now this is a Chev 383 long runner tune port vs short runner point is not engine but the curves.
A lot would see that big loss of torque to be too much even for the power gains and extended rpm gains especially in the street.
Say we got 28" tires a 2.45 1st and 3.55 gears with the long runner now and thinking about switching to the short runners.
If we look at where both engines make 350 hp there about 500 rpms apart 3500 rpm vs 4000 rpm. The 3.55 will turn about 3500 rpms with no converter slip factored in at 33.5 mph for the short runner engine to turn 4000 rpms at 33.5 mph so they both would be making similar hp at 33.5 mph they would now need 4.06 rear gears or a 2.80 1st gear or some combination of different rear and trans gears that made a total 9.95:1 in 1st vs the 8.70:1.
When the long runner engine is at 2500 rpms the short runner 4.06 would be at 2860 rpm making 10-15 more hp than the long runner. They would be both making 400 hp at 38 mph and from then on the short running would dominate it as it would rocket up to it's 50 hp gain, so from 200-400 hp the curves would be similar and above that the short runner would dominate if regeared. That huge torque bump would basically vanish once you factored torque to the ground.
And yes you could run deeper gears with the long runner engine but without the extra rpm and hp to back it up it's just gonna run out of rpm and hp sooner so whatever you run with the longer runner the short runner can go deeper.