If you think about it, a longer strokeing engine takes longer to rotate.. yeah it has abit more air going through the combustion chamber but in theory a sorter rod/strock engine will rev faster there for pushing the air around the engine much quicker there for spinnig the turbo faster..If the 5e was alot bigger in bore then yeah it will make alot of diffrance with torque/spool up times!.. its like a power bike for instance sorter rods/carbs and it revs like a bitch at the end of the day starlets weigh a bag of flower so is there realy going to be much lag? i dont think so!!...Also its down to what turbo you choose and how good your mapper is to get it to spool alot quicker!!
Also if you look at the leaderboard Alan e makes more nm/torque on a 4e then stubby with his 5e, Alan hasnt made as much power but it says it all realy
Not sure what to make of all that. Are you saying a 5E doesn't produce more torque and a 4E spools a turbo faster?
Dunno how it takes it longer to rotate, 1000rpm is 1000rpm regardless of the engine, the pistons just have to move up and down faster in the longer stroking engine.
It's quite simple, it's all about leverage, stick a big bar on something and you can shift it easily cause you have more leverage or torque. The 5E crank is a little longer than a 4E crank so the rods have more leverage when pushing down, this is giving you more torque.
It's the extra 200cc of exhaust gases that reduces the spool up time.
There's a fair difference between Stubbys and AlanEs setups, alan ran nitrous which is torque in a bottle, also runs 5E cams and a slightly smaller turbo which increases torque lower down the revs. Stubby has much larger cams which puts the torque peak closer to the rev limiter but generating more power by using revs. You would need to identically built motors with cams and turbos except one being a 5E and the other 4E to make the comparison.