Power on a Budget

[Syn]

it depends on which year engine, the 3100 in the years 2000+ are almost the same, but it also depends on what you get out of your engine for h/p wise

[SappySE107]

Thats why I said all the same stuff is available. Only the pistons are different and the bore. Rest is the same. I dont really see the reason for these questions. Its not like its a different stroke or a different design. its the same motor other than bore. Displacement wins, period.

[Syn]

Thats why I said all the same stuff is available. Only the pistons are different and the bore. Rest is the same. I dont really see the reason for these questions. Its not like its a different stroke or a different design. its the same motor other than bore. Displacement wins, period.

whoops i was not realizing what was said. i was talking stock vs stock

[project60degree]

so all in all they (3100/3400) are both great engines it just depends on what characteristics you are looking for in an engine. its all opinions, me myself like the 3100

[El_Diablo]

Thats why I said all the same stuff is available. Only the pistons are different and the bore. Rest is the same. I dont really see the reason for these questions. Its not like its a different stroke or a different design. its the same motor other than bore. Displacement wins, period.

okay.... say i have a 3400 and it tops out at 6 grand

now you take a 3100 with a lil less power due to displacement and get those revs up there, now your gonna be able to hold gears longer.... who do you think is gonna win?

[RacerX11]

The 3400.

[SappySE107]

Yeah, um, by higher RPM from the weight of the piston difference, i was talking theoretical small change there. 3400 is stilll going to win because if a 3400 redlines at 6000 (which is real low), then the 3100 is gonna redline around 6025.

[El_Diablo]

im miss understood yet again

[RacerX11]

No, we understood you just fine. Go take a car with a 3400. Swap in a 3100. It will now be slower. Even if you "hold gears longer" you will still be slower.

[SappySE107]

Misunderstood? Not that I can tell. Perhaps explaining your reasoning instead of rolling your eyes would get us to understand you a bit better. Maybe not though, your call.

[X11_STE]

Um, theres no replacement for displacement. 3400 wins.


Take a drag with a built streetable honda vs. a properly built Chevy V8. The honda get the hole shot 'cuz he's lite weight and can rev nice n hi. V8 gets into its power band a third of the way down the track and is now making more power and by the final third of the track, chevy passes the honda and wins due to more power via displacement.

[El_Diablo]

Misunderstood? Not that I can tell. Perhaps explaining your reasoning instead of rolling your eyes would get us to understand you a bit better. Maybe not though, your call.

okay... im drunk so bare with me


you take a 3100 with the same mods as a 3400 and the 3400 will have a very small power advantage where the 3100 might be able to get 500 more revs because of its volumetric effiency (same area in the heads/intake but a smaller displacement means a greater VE) and lighter assembly

but like i said... im a bit tipsy (i let my dads gf buy me a few drinks for a bday gift ) so it may not make much since

[carbon]

Misunderstood? Not that I can tell. Perhaps explaining your reasoning instead of rolling your eyes would get us to understand you a bit better. Maybe not though, your call.

okay... im drunk so bare with me

you take a 3100 with the same mods as a 3400 and the 3400 will have a very small power advantage where the 3100 might be able to get 500 more revs because of its volumetric effiency (same area in the heads/intake but a smaller displacement means a greater VE) and lighter assembly

You are going to get more revs from a motor with a shorter stroke... a better comparision would be a 2.8 vs 3.1. The 2.8 can be made to rev higher as the piston speed for any given RPM is lower.

Now the difference between the 3100/3400 regarding VE is going to give you very minimal gains as far as revs go becuase of their identical stroke... the piston speed is the same, but the power curve will be different, possibly. The higher power output of the 3400 will make up for that(300cc).

Short strokers will be more reliable at high RPMs than a long stroke motor. That is why poeple talk about destroking motors

[SappySE107]

Even so, you have less shrouding with the 3400 bore which you cannot really make up for on a 3100 bore unless we are going to start talking millionaire budget to have custom heads made and blah blah blah. I think you are trying to hard to make the 3100 have a chance when both motors are going to be damn close in any event with the 3400 edging it out no matter what in any theoretical race/exact mod simulation. 3400 will have higher compression than the 3100 with the same piston specs minus the bore difference as well. We are talking identical mods to both motors to save all the variables.

If we were discussing 2.8 vs 3.1, then it would be a lot more interesting:P

[Froggx]

Um, theres no replacement for displacement. 3400 wins.


Take a drag with a built streetable honda vs. a properly built Chevy V8. The honda get the hole shot 'cuz he's lite weight and can rev nice n hi. V8 gets into its power band a third of the way down the track and is now making more power and by the final third of the track, chevy passes the honda and wins due to more power via displacement.

I think you somehow got that backwards. The chevy V8 should have a significant low end torque advantage. Hondas are known for lacking any measurable form of power until they reach high rpms. The chevy motor is most likely in a RWD application. The honda motor is most likely in a FWD application. Driven correctly and with the two cars configured in a relatively similar manner (i.e. both on drag radials, slicks, etc.) I cannot think of a way for the Honda to come close to winning out of the hole if the cars are fairly configured. If the honda is going to win it will have to pass the V8 further down the track.