One thing leads to another... mean 318?
How does stroke increase HP ??
Bore only can increase hp cause it allows more air flow, nothing to do with increased displacement.
It has everything to do withincreased dispalcement.
Would a identical built 340/360 have the same cylinder pressure ??
No, near moot point though. This point of argument can be adjusted.
and if they did stock bore, 4.04" vs 4", the 340 piston would have more surface area so it would have more force driving the piston down,
True only at the piston point.
if both where stroked to give each the same displacement the 4.04" bore would have slightly less stroke multiplying the slightly higher force,
Incorrect. There is no multiplication via the piston.
which should theoretically equal out. But since they don't have same displacements 340 vs 360 and at similar VE% the 360 will have less force on the piston but have lot more multiplying "stroke" on that force,
Incorrect. The extended stroke brings in more air and fuel than the shorter stroke given the otherwise equally parts. In this case, the cam timing events.
The lasrger bore doesn't equal out or better it.
ie.. more displacement more torque. Not cause of stroke cause of overall displacement. But that is obviously just torque, so yes an increase of stroke on any given bore is gonna increase displacement ie.. torque but keeping everything else equal is gonna decrease powerband rpm, which should put you at similar hp output.
Slightly confusing. Two engines of the same displacement, 1 short stroke big bore, the other, small bore big stroke, should equal torque and HP. But it doesn't. It's close though.
So how does stroke in it's self increase hp ?
Answered below.
The larger the stroke over the OE stroke, the larger the displacement. The longer stroke takes in more air and fuel. Thus increasing the explosiveness within the cylinder. This creates more torque and HP.
Therefore, your statement of “Bore only increases HP” is false. Increasing ether will increase displacement and torque to equal HP.
For your theory to be true the engine with the increased stroke you have make peak power at a similar rpm as the non stroked engine eg... 360 vs 408.
Not true. The longer stroke engine normally, not always, makes peak power earlier.
Say for my 360 create engine is suppose to dyno around 400 hp at 5400 rpm, if stroked it to a 402 keeping everything else the same.
It would have peak hp at a lower rpm?
How much lower 400-600 rpms lower ?
more/less ?
Speaking theoretically....
Q1, = yes
Q2, = an excellent question I can not answer. To many variables and unknowns to take a shotin the dark at.
Q3, =less
If say it's around 4835 rpm (Why 4835? Cant we just use round numbvers? WTF? Is this your exact engine?)
peak hp for the 408 both would have the same cid to rpm would be proportional for both engines and both would have similar power give or take the exact effect on those combos.
Having trouble following this. LAck of punctuation and gramma.
Not saying it would play out where power is always gonna be identical. True stroke is gonna add displacement there for each power stroke is gonna have more fuel and air there for more torque, But torque is just basically a snap shot of that power stroke, hp is all those power strokes added up.
Somewhat true. You could find out the power of a single stroke. Just because it is a V8 doesn't mean your limited in that area. The power derived from one power stroke will still create HP.
For someone to change his mind on a subject, the other has to make a compelling or at least any argument, you yet to do either, not like you have to, but there's no reason to change my mind cause no one has said anything resembling a point.
Do your just due home work and find out! I'm not here to convince or school you with scientific reports and data with fact sheet and spread sheets.
I get that and have said exactly that multiple times so far and agree with what you have just said .... Yes adding stroke or any means of displacement is gonna increase torque to a given combination.
Thus adding HP. More torque is mpore HP.
But here's where i seem to differ from you guys, "RPM" to me rpm is on par with Torque, and yes adding displacement is gonna add torque but it's gonna come at the cost of RPM.
Cost of RPM where? More cam? You just moved the curve upwards. Added stroke? You added low rpm power.
So more torque by adding displacement and lowering rpm powerband doesn't necessarily mean more power "hp". Is this last statement wrong ?
This has been my whole point.
Yes it is wrong. More torque will allways equal more HP.
