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Y latio still selling ?

Tweakmax2

By Tweakmax2,
in General Car Discussion

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Ferraricalifornia

Ferraricalifornia

1st Gear

if i'm not wrong,

 

SOHC engines can rev more freely compared to DOHC engine....

 

but car manufacturers wanted to improve the refinement (less vibration of cars at idle), and improve the fuel economy of cars,

 

so instead of a single overhead camshaft, there's now 2 to do the job....

 

but these days, with Forced Induction technology, there's no more overhead camshaft's already....

 

all there is is just 2 injectors....1 for fuel, the other for air....

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Kelpie

Kelpie

2nd Gear

Dun think FC got anything to do with the size of the fuel tank

 

DOHC is a newer tech than SOHC, in fact I haven't come across any new car with SOHC except of Honda's DSi(which work in a different way), some MIK older models and MIC cars.

 

In fact, I read somewhere that the engine needs to be DOHC before VVT(or similar tech) can be implemented.

 

Since when DOHC is a newer tech than SOHC? Both were already in existence before you are I were borned [laugh]. 1900s.

 

Honda specializes in SOHC since the 1980s. Even their premium range of Acura TL uses V8 SOHC.

 

Regards,

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Kelpie

Kelpie

2nd Gear

i am not saying it is more powerful but i rather its a fact a DOHC will be less fuel efficient than a SOHC...

 

but seriously a stock sunny N16 Manual is pretty quick compared to other makes around the same range in SG..

 

I drove this Sunny before, can't match the ES. Speaking from personal experience. But when you say same range, which one are you comparing? In term of torque/HP, 0~100?

 

Regards,

 

 

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Kelpie

Kelpie

2nd Gear

Honda i-Vtec is SOHC, for Civic, Jazz etc. Only Civic 2.0 is DOHC.

 

Honda i-Vtec is DOHC, for Civic Si, CRV, Accord and etc. Except some line-ups such as Legend, Civic, Accord, Jazz are using SOHC.

 

Regards,

 

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Ferraricalifornia

Ferraricalifornia

1st Gear

so that confirms,

 

SOHC engines are relatively able to rev higher rpm's than DOHC....

 

that's why new Honda's engine with i-VTEC DOHC sound so dull and refuses to rev high high rpm....(speaking about the Accord)....

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Kelpie

Kelpie

2nd Gear

ols school VTEC B16 B18 B20 engines are DOHC...

 

ESI was SOHC...

 

then after ES models all were SOHC....

 

Aiyo, there are DOHC models lah, some may not be available in Singapore. ES also have 2.0 DOHC version mah. I suppose Honda believes that SOHC is more economical to manufacture, maintain and make better margins for bread and butter models.

 

Even for the same 2.0 DOHC, the normal Civic (the family sedan not the Type-R) also have different engine specification. Our local one is Z2, 155 horses, the Z3 (not sold in SG) is 197 horses.

 

Regards,

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Kelpie

Kelpie

2nd Gear

Dun think FC got anything to do with the size of the fuel tank

 

DOHC is a newer tech than SOHC, in fact I haven't come across any new car with SOHC except of Honda's DSi(which work in a different way), some MIK older models and MIC cars.

 

In fact, I read somewhere that the engine needs to be DOHC before VVT(or similar tech) can be implemented.

 

Forgotten about the i-DSI bit:

 

Basically, the i-DSI uses 2 valves per cylinder. This has something to do with the dual sparkplug configuration, which already took up precious space. Hence, probably the reason why they can't put more valves per cylinder.

 

The SOHC 1.5 in Jazz and City have 4 valves per cylinder, where the design is such that 3 valves are configured to work at low RPM but with all 4 valves opened at high RPM.

 

I think Toyota also have the T-VIS at one stage, where it will close one of the 2 valves to increase intake at low RPM.

 

Regards,

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Ken4555

Ken4555

1st Gear

I drove this Sunny before, can't match the ES. Speaking from personal experience. But when you say same range, which one are you comparing? In term of torque/HP, 0~100?

 

Regards,

 

i think he ES is faster...

 

but sunny manual pretty quick... then will depend on driver...

 

hmm.. avante is DOHC quiet high BHP right? but car so slow...

 

i think ultimately its the gearbox, ecu setup... and driver...

 

haha...

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Autofanatiz

Autofanatiz

Neutral Newbie

correct me if I'm wrong.. fl sunny's engine is exactly the same as those that first appear back in end 1999.. only 1.5 was phase out in the 2004 fl model.. the only thing extra for the fl 2004 model is only the e-throttle which is suppose to render the car more "efficient".. so if all of these are true, that make our current sunny a 10-yr old model...

so if we were to compare sunny with any other model during its glorious day, i guess it is not quite a bad car afterall..

But now.. of cos not!

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Happily1986

Happily1986

5th Gear

so that confirms,

 

SOHC engines are relatively able to rev higher rpm's than DOHC....

 

Where did you get that from? From a technical POV, what is the grounds for you to justify that?

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Happily1986

Happily1986

5th Gear

Forgotten about the i-DSI bit:

 

Basically, the i-DSI uses 2 valves per cylinder. This has something to do with the dual sparkplug configuration, which already took up precious space. Hence, probably the reason why they can't put more valves per cylinder.

 

The SOHC 1.5 in Jazz and City have 4 valves per cylinder, where the design is such that 3 valves are configured to work at low RPM but with all 4 valves opened at high RPM.

 

I think Toyota also have the T-VIS at one stage, where it will close one of the 2 valves to increase intake at low RPM.

 

Regards,

 

To add on, the spark plug fires twice in one engine cycle. This is very different from the conventional engine cycle. The firing is timing to coincide with some lag in between. The idea is that the second firing will help to combust any atomised fuel which have yet to burn up.

 

By doing so, the engine is able to extract maximum mechanical work from each drop of fuel (bearing in mind that the theoretical max efficiency of heat engines is still 0.5)

 

As you would expect, in order to allow for such a firing sequence, the overall engine cycle has to be lengthened and thus retarded so as to speak. This makes for a low stroke frequency. I am inclined to think that such a delayed engine cycle in the i-DSI makes this engine similar to the 1NZ-FXE which is found in the Prius, also another powerplant having a retarded engine cycle.

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Joseph22

Joseph22

Turbocharged

Are you sure quiet engine. The main cons for Lancer EX/MR model are noisy and rough engine.

 

 

its quiet when crusing.

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Joseph22

Joseph22

Turbocharged

All cars are quiet when cruising on a smooth surface.

 

 

we are refering to engine sound. not road sound or wind sound. totally different issue.

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