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Old 21 Mar 2005, 03:29 am
Cuthbert
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Default Can anyone tell me what's these different?

Hi,

I checked the engine types of my fried's car and mine.
One is "2.3L I-4 SFI SOHC;" ------------(2000 Accord DX)
The other is "3.0L V6 EFI SOHC VTEC." --(2000 Accord EX)

Can anyone tell me what's the differences between these engines?
Thanks.

Cuthbert

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Old 21 Mar 2005, 06:21 am
twfsa
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Default Re: Can anyone tell me what's these different?

one is a 4 cylinder I 4 inline 4, the other V6 6 cylinder.

Tom

"Cuthbert" <cuthbert.kao@gmail.com> wrote in message
news:1111397357.568544.72710@l41g2000cwc.googlegro ups.com...
> Hi,
>
> I checked the engine types of my fried's car and mine.
> One is "2.3L I-4 SFI SOHC;" ------------(2000 Accord DX)
> The other is "3.0L V6 EFI SOHC VTEC." --(2000 Accord EX)
>
> Can anyone tell me what's the differences between these engines?
> Thanks.
>
> Cuthbert
>



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  #3 (permalink)  
Old 21 Mar 2005, 06:51 am
Michael Pardee
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Default Re: Can anyone tell me what's these different?

"Cuthbert" <cuthbert.kao@gmail.com> wrote in message
news:1111397357.568544.72710@l41g2000cwc.googlegro ups.com...
> Hi,
>
> I checked the engine types of my fried's car and mine.
> One is "2.3L I-4 SFI SOHC;" ------------(2000 Accord DX)
> The other is "3.0L V6 EFI SOHC VTEC." --(2000 Accord EX)
>
> Can anyone tell me what's the differences between these engines?
> Thanks.
>
> Cuthbert
>

2.3L =2300 cc cylinder displacement (often called "engine size"); 3.0L=3000
cc
I-4 is an inline four cylinder engine design; V6 is a V-shaped six cylinder
version with three cylinders on each side of the V
SFI is Sequential Fuel Injection, where fuel is injected to each cylinder
just in time to be sucked in;
EFI is Electronic Fuel Injection... same thing basically, but the fuel is
injected to all cylinders in the bank at one time.
(SFI is a special form of EFI)
SOHC is single overhead cam - one camshaft operates intake and exhaust
valves. The alternative is DOHC (Dual Overhead Cam), with separate camshafts
for intake and for exhaust valves. Older engines often had camshafts in the
crankcase instead of above the head (overhead), and used pushrods to make
the valves work. Pushrod engines didn't rev very freely.
VTEC is Valve Timing Electronically Controlled. At normal engine speeds the
camshaft sits in a position where the cams don't allow much "overlap" (times
when both the intake and exhaust valves are open at the same time when the
exhaust stroke transitions to the intake stroke.) This allows for steady
idle and adequate power for tooling around. Engine tuners call it a "mild"
cam. At a certain rpm, the camshaft is shifted by electronic command to use
what is known as a "hot" cam; the intake valves open well before the exhaust
stroke is finished and the exhaust valves stay open well into the beginning
of the intake stroke. This improves both the intake charge and the exhaust
scavenging. Using this cam all the time would produce a characteristically
rough idle (you may have seen race cars shaking at idle... that's why), but
at high rpm where breathing is hard for engines the effect is dramatic,
increasing high end engine power as much as low pressure turbos do, and
extending the maximum rpm (red line). Hoo-yah!

Mike


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