Difference VTEC Sohc & Dohc

[Dynaway]

depends on the type of cam profile.....

 

if peak HP is wat u r after.......

 

 

here's a nice site

 

http://www.ukcar.com/features/tech/Engine/vv/vvt_31.htm

 

http://members.lycos.nl/hendrik/honda/vtecinfo.htm#camshaft

 

 

i'm not driving a Civic or a Vtec.... my car is pretty much stock.... i'm not a crazy over BHP numbers

Edited September 10, 2007 by Dynaway

[Kelpie]

I am considering getting the 2L Civic .. it's cheap now ... but can it outrun a RX7 ? i dont want to loose to my classmate!

 

if you talking about FD 2.0Si.. no u dont stand a chance with the rx-7

if you talking about a fully lightened ef/eg/ek hatchback with modded b20c.. yes it will smoke the crap out of the rx7 even in NA.. not talking about TC yet

 

 

different class of car....depending on wat type of race... if drag, a fully lightened civic with B20 will definitely put a run for the money against the RX7..

 

however if its in the circuit, tat may be a different story.

 

anyway, both class of car are so far apart to have a far comparision.

 

Recently view a show on RX-7. Very Popular car with people who like to drag. Because of its engine design, it has an inheritence problem of Turbo lag, you need an experience RX-7 driver to know when to accelerate to obtain its optimal potential.

 

Regards,

[Dynaway]

the 13B rotary engine are effectively a V6 engine....

 

even in NA mode, those early days 12A or 13B rotary are pretty impressive

[Turbonetics]

do u mean it is possible for a vtec-less cam to generate more hp then a vtec?

wats your setup?

 

non-vtec head is more suitable to play turbo.

if you wnat to play NA,you can't live without Vtec.

[Dynaway]

not really ... it all depends on wat the engine is setup for... pure peak power at higher rpm range more suited for drag, use of Vtec Killer cams are still feasible for NA setup.

 

as for turbo, u dun really need the Vtec IMHO... since the RPM climbs up so fast during full spooling... whether u have or dun have also not much diff...u'll want to run a cam that is having the appropriate duration & lift to maximise the air flow..

 

for NA setup, we will want the longest valve overlap duration tat is most feasible....

[Dynaway]

WOW revelation answer... so VTEC is NOT power?

 

 

 

if u fully understand how the "Vtec" system works...

 

during normal operations, only one of the intake valve is extended fully, while the other is open slightly.... during the Vtec kick-in, the rocker arm are engaged to the High Lift lobes on the cam which extends both valve more than the normal operating lobes

 

 

u can take a look at the following vids n notice that one of the valve is only slightly open.

 

http://www.youtube.com/watch?v=6I53liuuhc4

 

[Kelpie]

the 13B rotary engine are effectively a V6 engine....

 

even in NA mode, those early days 12A or 13B rotary are pretty impressive

 

Certainly impressive with only 1.3L. Easily mod to 400-500bhp according to the show. But the dragger admitted that turbo lag is its greatest enemy for rotary engine on Turbo.

 

Regards,

[Porker]

They missing a lot,the sound of engine scream is

 

Subjective lah. I personally think that sound is crude. Prefer a flat six or M engine sound anytime. Like I said, its subjective

[Vtim]

So much numbers!! So much models!!

I'm going nuts..

 

here's is all you need to know about Honda Vtec cars - http://asia.vtec.net/

 

how various Vtec works - http://asia.vtec.net/spfeature/vtecimpl/vtec1.html

 

SOHC i-Vtec on the R18A - http://asia.vtec.net/Engines/RiVTEC/index.html & http://asia.vtec.net/Engines/R18A/index.html

 

K20Z engine - http://asia.vtec.net/Engines/K20Z/index.html

 

and the mighty K20A Spec R engine - http://asia.vtec.net/Engines/FD2K20AR/index.html

 

 

ENJOY

[Dynaway]

they are not 1.3 if u ask me.... their effective volume are much more than 1.3

 

if i remember correctly, the correct calculation u need to factor in 1.7 to get the actual working volume

 

 

1.7 X 1308 = 2223.6cc

[Kelpie]

they are not 1.3 if u ask me.... their effective volume are much more than 1.3

 

if i remember correctly, the correct calculation u need to factor in 1.7 to get the actual working volume

 

 

1.7 X 1308 = 2223.6cc

 

1. So long the owners are laughing about the saving on road tax and the authorities don't case, everyone happy.

 

2. This is also a reason why it is popular among the dragger because of low road tax. Save the money and mod somemore.

 

Regards,

[Dynaway]

not much saving.... for the amount of petrol it burns... ahahha.

 

my old man used to drive a RX4 coupe in the 80s.... every week petrol easily 50-70 at that time..

 

if now.... i think sure go broke.

[Kelpie]

not much saving.... for the amount of petrol it burns... ahahha.

 

my old man used to drive a RX4 coupe in the 80s.... every week petrol easily 50-70 at that time..

 

if now.... i think sure go broke.

 

1. Aiya, if want to drive such car, must have the dough to feed it.

 

2. Is it true that they have already stop production of RX-7 and is fast becoming a collector item?

 

Regards,

[Curahee]

They missing a lot,the sound of engine scream is

 

But in Singapore got so much chance for us to floor till 7200 rpm mei? So many cars on the road nowadays

[Turbine]

Why not? Gear 1 7,200rpm dun get you anyway.. =P

[Dynaway]

production stop in 2002 or 2003... with the last model Spirit-R

 

there is 1 unit here..... not too sure if its still ard..

[Kelpie]

production stop in 2002 or 2003... with the last model Spirit-R

 

there is 1 unit here..... not too sure if its still ard..

 

If I'm correct the last batch has a FD code name or something like that.

 

Regards,

[Whambamtymam]

Hey guys. sorry but another honda noob here.

 

If im cruising while on auto mode. can i switch to the manual mode and downshift maybe a gear or 2 and ram it? will there be any damage to the gear box switching from auto to manual while the car is moving?