oversize tb and manifold for performance

[Oderf]

before.

then sure stock b16b engine can be better if using re-map ecu...

 

[shiroitenshi]

it can give better air flow. then sure hp increase. provided with tuning. torque not will not much increase since it reflect to displacement.

care if I add? I think that reducing rotating mass such as flywheel, and friction (Those crank bearing things) also increases torque.. you pay a lot of a slight increase though.. (O_o)

 

[zaki]

ITB = less restriction I think...

How can it push more air in? NA is about sucking... turbo's are about stuffing..

NA sucks.. :P

NA sux!! :P

lilvee is right. interesting fact on F1 cars. most stock production NA cars have engine efficiency less than 100%. if you want to have more than 100% VE, you can put supercharge/turbocharge or you buy a turbo car. turbo car can have more than 100% efficiency due to its capability to feed more air than an NA car does. F1 car can achieve around 130% VE. that's like boosting 0.3-0.5bar (??)

 

[shiroitenshi]

NA sux!! :P

lilvee is right. interesting fact on F1 cars. most stock production NA cars have engine efficiency less than 100%. if you want to have more than 100% VE, you can put supercharge/turbocharge or you buy a turbo car. turbo car can have more than 100% efficiency due to its capability to feed more air than an NA car does. F1 car can achieve around 130% VE. that's like boosting 0.3-0.5bar (??)

but F1 achieves speeds that can create pressure at the intake point with thier special vents that direct air... (I thinklah.. I'm no F1 engineer!) I think it's called ram-air effect or something.

our cars ah.. at terminal velocity also not so much I think.. since the big huge ass bumper and radiator is blocking all the air.

 

[hattech-v]

NA sux!! :P

lilvee is right. interesting fact on F1 cars. most stock production NA cars have engine efficiency less than 100%. if you want to have more than 100% VE, you can put supercharge/turbocharge or you buy a turbo car. turbo car can have more than 100% efficiency due to its capability to feed more air than an NA car does. F1 car can achieve around 130% VE. that's like boosting 0.3-0.5bar (??)

oit oit.. hehe

 

[zaki]

but F1 achieves speeds that can create pressure at the intake point with thier special vents that direct air... (I thinklah.. I'm no F1 engineer!) I think it's called ram-air effect or something.

our cars ah.. at terminal velocity also not so much I think.. since the big huge ass bumper and radiator is blocking all the air.

ram air effect is another thing but it can also produce positive boost.

 

[achor]

ok... here's a question, stock b16a has single valve spring at the exhaust valve rite? or maybe it was single valve spring at the intake valve. mean while b16b has dual valve spring on both.
is this a fact or myth?

 

[lilvee]

Here's a nice summary of resonance tuning using ram theory for an IM :

Originally posted by Jim McFarland

" Every physical system has one or more "natural vibration" frequencies that are characteristic of that system .

An organ pipe is a common example of how a resonant condition is displayed. Based upon the physical dimensions of an organ pipe, a flow of inlet air may produce a resonant tone or pitch.

Changing the pipe's dimension, given the same amount of input air, could produce another resonant point or tone.

With regard to an engine's intake {or exhaust} system, it is possible to dimension a passage to accommodate specific cylinder displacements and engine speed so that a "resonant" condition helps produce an increase in total air flow {intake or exhaust}. In it's simplest form, this amounts to "tuning" an inlet {or exhaust} passage. Physical dimensions of the passage are constructed to provide a resonant tuning point {particularly relative to rpm and valve timing} at which a "boost" in flow is produced. This results in an increase in cylinder filling {volumetric efficiency} and potential gains in torque ".

Notice that with invididual throttle bodies (ITB's) you lose this resonance effect because the reflected wave escapes out into the engine bay (or the atmosphere) and is not stored and returned by a plenum/acoustic chamber. ITB's do NOT use ram theory to get that extra kick at peak torque because they usually in race form do not have a plenum. In some street ITB's, a plenum is attached for practical reasons (sound deadening and filtering). They rely on very very large amounts of passive cylinder filling based on the piston's effects and use tuned air horn height and tapered diameter (with an S-shaped velocity stack opening) to get the N/A pressure boost effect that I'm talking about.

Now many All Motor drag scene in US start to banned this ITB.... ermmmm

Sorry... for the long post.

 

[AcuraV]

In a simple engineering, torque will increase when power is increase. Torque is the function of power in:-

HP = Torque x RPM / 5252 :regular_smile:

does it mean calculation base on this if torque 200 x 6500rpm=1300000/5252 = 247.5HP on crank? den roughly 30% power lost to wheel...den on wheel power = 173.26whp? am i right base on this calculation?

 

[lilvee]

Yeah... thats about it.

But the torque should be in ft/lbs not Nm

Here we used Nm. So..

Nm = 0.7375621500712257 ft/lbs

 

[hattech-v]

ok... here's a question, stock b16a has single valve spring at the exhaust valve rite? or maybe it was single valve spring at the intake valve. mean while b16b has dual valve spring on both.
is this a fact or myth?

yes b16b both dual spring.

 

[pok nik]

so dual valve spring is firmer...how come i ve seen mugen valve spring with sinngle on the exhaust?

 

[hattech-v]

moogen maybe.. haha

 

[Fussion_R]

this thread just make me recap my mechanical lecture long time ago....
very nice and full of information thread...

Mr.Lilvee is like the excelent student that all the students copy from him when theres a quiz in the tutorial class.... ekekkekekee... :_:

 

[lilvee]

Ha ha.. Juz wondering, if last time when I'm studied got access to Google, i think i'll scored 4flat all the way... LOL

Google is our best fren now days... its free resources

 

[zaki]

Ha ha.. Juz wondering, if last time when I'm studied got access to Google, i think i'll scored 4flat all the way... LOL

Google is our best fren now days... its free resources

how i wish there is google when i was a student.....

 

[lilvee]

Power in your finger... LOL

 

[pok nik]

i dont know how to swim but i like googling...haha

 

[hattech-v]

who create google aaa?

 

[zaki]

who create google aaa?

please google it....

(google can be used as a verb) :_: