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Valve mechanism
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tytan
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Joined: 11 Jul 2007
Posts: 39

PostPosted: Thu Jul 19, 2007 2:47 pm    Post subject: Valve mechanism Reply with quote

Anyone can share wat is "Valve mechanism"?

last time my MYVI engine using 12 valve with 3 spark plug our ACCENT also using 12 valve. it is using 3 spark plug too?
12 valve is it under power cause other same range car is 16 valve, even MYVI 1.3 also 16 valve.
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AhBeng1
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Joined: 06 Jun 2006
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PostPosted: Thu Jul 19, 2007 4:50 pm    Post subject: Re: Valve mechanism Reply with quote

tytan wrote:
Anyone can share wat is "Valve mechanism"?

last time my MYVI engine using 12 valve with 3 spark plug our ACCENT also using 12 valve. it is using 3 spark plug too?
12 valve is it under power cause other same range car is 16 valve, even MYVI 1.3 also 16 valve.


first you need to know there are 2 type of engine (for normal piston engine)
it's SOHC and DOHC

SOHC can have 2, 3 or 4 valve per cylinder
where DOHC have 4 valve per cylinder
Cylinder is the tube store the piston. where 1 piston need 1 plug (Exception for i-dsi engine)

your MyVi 1.0 DOHC only got 3 cylinder
so it got 3cy X 4valve = 12 Valve with 4 plug.

for MyVi 1.3 DOHC got 4 Cylinder
so it got 4cy X 4valve = 14 Valve with 4 plug.

for accent1.5 SOHC got 4Cylinder with 3 valve per cylinder.
so it only got 4cy X 3 valve = 12 valve with 4 plug.


more example on SOHC engine
for Aveo1.5 SOHC got 4Cylinder with 2 valve per cylinder.
so it only got 4cy X 2 valve = 8 valve with 4 plug.

for wira1.5 SOHC got 3Cylinder with 4 valve per cylinder.
so it only got 3cy X 4 valve = 12 valve with 3 plug.
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ropai
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PostPosted: Fri Jul 20, 2007 4:17 am    Post subject: Reply with quote

basic rule of thumb, the more valves you have, the easier the engine breathes at higher RPM.

and normally, SOHC engine has more pickup at lower RPM compared to DOHC with same engine cc. this makes SOHC more suitable for city driving, while DOHC is more suitable for high speed.

variable valve timing (and related tech) was invented to reduce the difference between these two engine types. so modern car manufactures are now able to choose between these engine types and worry less about where in the RPM range the max torque resides.

of course i'm generalizing, there are always exceptions...
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tytan
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PostPosted: Tue Jul 24, 2007 10:39 am    Post subject: Reply with quote

can't understand...anyone can translate into chinese?

if accent 1.5 (sohc 12valves), myvi 1.3 (dohc 16valves) and getz 1.4 (dohc 16 valves). which one will pick up faster?

din realize getz 1.4 auto selling 58k, if not maybe i get that car n not accent. but accent style is more suit for young man.
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wnl9066
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Joined: 20 Jul 2007
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PostPosted: Tue Jul 24, 2007 11:14 am    Post subject: Reply with quote

tytan wrote:
can't understand...anyone can translate into chinese?

if accent 1.5 (sohc 12valves), myvi 1.3 (dohc 16valves) and getz 1.4 (dohc 16 valves). which one will pick up faster?

din realize getz 1.4 auto selling 58k, if not maybe i get that car n not accent. but accent style is more suit for young man.


i think SOHC will have faster pick up, and 2ndly is getz, then myvi.
anyway pick up or not, have to put in account the weight also. that one i dont know
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AhBeng1
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PostPosted: Tue Jul 24, 2007 12:06 pm    Post subject: Reply with quote

tytan wrote:
can't understand...anyone can translate into chinese?

if accent 1.5 (sohc 12valves), myvi 1.3 (dohc 16valves) and getz 1.4 (dohc 16 valves). which one will pick up faster?

din realize getz 1.4 auto selling 58k, if not maybe i get that car n not accent. but accent style is more suit for young man.


normally pickup is totally depand on your horse power over weight...
not on valve, the more valve will give you a better horse power.

example,
1) both car with same engine and same gear ration. the lighter will have the best pickup compare with the heavier one.
2) if both car with same weight, the more HP will gain the best pickup compare to less HP.

if using the 3 sample above...
MyVi1.3 = 87ps / 960kg = 0.09ps/kg
Accent1.5 = 91ps / 1022kg = 0.09ps/kg
gets1.4 = 97ps / 1004kg = 0.1ps/kg

gets will have the best pickup Wink Wink
(which will be hard to notice as they are only a little different only)

remark: some other factor also effect the pickup. Wink Wink
e.g. AWD will have best pickup compare to RWD and FWD.
e.g. Large gear ratio is better pickup compare to lower gear ratio. Razz Razz Razz
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wnl9066
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PostPosted: Tue Jul 24, 2007 1:31 pm    Post subject: Reply with quote

nice info ahbeng...yup, now even i undertsand better. Very Happy
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ropai
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PostPosted: Tue Jul 24, 2007 10:26 pm    Post subject: Reply with quote

AhBeng1 wrote:
tytan wrote:
can't understand...anyone can translate into chinese?

if accent 1.5 (sohc 12valves), myvi 1.3 (dohc 16valves) and getz 1.4 (dohc 16 valves). which one will pick up faster?

din realize getz 1.4 auto selling 58k, if not maybe i get that car n not accent. but accent style is more suit for young man.


normally pickup is totally depand on your horse power over weight...
not on valve, the more valve will give you a better horse power.

example,
1) both car with same engine and same gear ration. the lighter will have the best pickup compare with the heavier one.
2) if both car with same weight, the more HP will gain the best pickup compare to less HP.

if using the 3 sample above...
MyVi1.3 = 87ps / 960kg = 0.09ps/kg
Accent1.5 = 91ps / 1022kg = 0.09ps/kg
gets1.4 = 97ps / 1004kg = 0.1ps/kg

gets will have the best pickup Wink Wink
(which will be hard to notice as they are only a little different only)

remark: some other factor also effect the pickup. Wink Wink
e.g. AWD will have best pickup compare to RWD and FWD.
e.g. Large gear ratio is better pickup compare to lower gear ratio. Razz Razz Razz


i think it should be torque over weight....

and the higher the torque at lower engine revolution (rpm), the better the pickup... that's what BMW is trying to do with their newer diesel engines...

i'm too tired to write today... better start reading some kinematics books for further info...
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sharirm
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PostPosted: Wed Jul 25, 2007 8:13 am    Post subject: Reply with quote

"and the higher the torque at lower engine revolution (rpm), the better the pickup... that's what BMW is trying to do with their newer diesel engines... "

hehehehe, sound like the pick up is good, but cannot go fast, like a lorry Smile
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SinEater
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Joined: 15 Mar 2006
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PostPosted: Wed Jul 25, 2007 10:59 am    Post subject: Reply with quote

Thanks for explanation Ah Beng1, that is great info! I also blurblur before this..
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tytan
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Joined: 11 Jul 2007
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PostPosted: Wed Jul 25, 2007 9:51 pm    Post subject: Reply with quote

sorry silly question again.

wat is "ps" actually is?
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AhBeng1
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PostPosted: Thu Jul 26, 2007 4:35 pm    Post subject: Reply with quote

tytan wrote:
sorry silly question again.

wat is "ps" actually is?



don't worry... no question is silly Razz Razz .
Horse power in German term (which should not a lawful unit anymore)...

the different between HP & PS is
1 PS = 0.9863201652997627 hp
(is very minor which most will think that PS is HP)


for your knowledge...
kilowatt (power) which normally used in perodua to represent horsepower and the calculation is: -
1 PS = 0.73549875 kW
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sharirm
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PostPosted: Thu Jul 26, 2007 4:49 pm    Post subject: Reply with quote

ahbeng very good with car knowledge. Very Happy
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AhBeng1
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PostPosted: Thu Jul 26, 2007 4:50 pm    Post subject: Reply with quote

ropai wrote:
i think it should be torque over weight....

and the higher the torque at lower engine revolution (rpm), the better the pickup... that's what BMW is trying to do with their newer diesel engines...

i'm too tired to write today... better start reading some kinematics books for further info...


sharirm wrote:
"and the higher the torque at lower engine revolution (rpm), the better the pickup... that's what BMW is trying to do with their newer diesel engines... "

hehehehe, sound like the pick up is good, but cannot go fast, like a lorry Smile


I also hear of this, normally higher torque is only apply to lorry, MPV, Van as they need to carry heavy load. Razz Razz

I not really understand it. and normally I just look at Horse Power for pickup becoz the higher the HP, the torque also increase. Wink Wink Wink
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AhBeng1
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PostPosted: Thu Jul 26, 2007 4:59 pm    Post subject: Reply with quote

sharirm wrote:
ahbeng very good with car knowledge. Very Happy


my home got lot of sifu Laughing Laughing ... i just learn from them Laughing Laughing Laughing ...

and they are very nice, no mr. google Twisted Evil Twisted Evil Twisted Evil
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