Re: what is the spark plug order on a 91 toyota corolla

"Ray O" <rokigawaATtristarassociatesDOTcom> wrote in message
news:42951$4579a629$44a4a10d$2227@msgid.meganewsservers.com...[color=blue]
>
> "Nicholas Bourne" <nbourne@optusnet.com.au> wrote in message
> news:457958b7@dnews.tpgi.com.au...[color=green]
>>[/color]
> <snipped>[color=green][color=darkred]
>>>
>>> No self-respecting engineer would design an engine with a firing order
>>> of 1-2-3-4 because the power pulses would be too uneven.[/color]
>>
>> I have a commodore with a buick based V6 in it that has a 6-1-2-3-4-5
>> firing order, i'm sure somewhere in the the world is a 1-2-3-4 firing
>> order.
>>[/color]
>
> The OP has an in-line 4 cylinder engine with cylinder numbers, from front
> to back, 1,2,3,4, and the firing order is definitely NOT 1,2,3,4 for his
> engine. IMO, telling him that it could be 1,2,3,4 because it may be that
> somewhere in the world is not useful advice and is likely to reinforce his
> notion that 1,2,3,4 is the correct firing order when in fact it is
> definitely wrong.
>
> In the case of an engine with 2 banks like a V or horizontally opposed
> configuration, there is more than 1 way to number cylinders. For example
> on a V6 engine, one configuration is to have cylinders 1,2, and 3 on one
> bank and 4, 5, and 6 on the opposite bank; and another configuration is to
> have 1, 3, and 5 on one bank and 2, 4, and 6 on the opposite bank.
> Obviously, cylinder number designation is a big factor in determining
> firing order.
>
> Engineers determine firing order by trying to smooth out, or balance the
> power strokes with the other 3 strokes of a 4 cycle engine. If the firing
> sequence had adjacent cylinders on the same bank firing, the engine would
> be unbalanced. In the case of the Buick engine you cited, note that the
> firing order sequence is even-odd numbered cylinders, suggesting that the
> cylinder numbering sequence is odd on one bank and even on the opposite
> bank. The firing sequence does not have adjacent cylinders on the same
> bank firing.
> --
>
> Ray O
> (correct punctuation to reply)[/color]

Fair enough, I should have confirmed that Toyota 4 cylinder engines, be they
a S series, A Series, etc have a 1-3-4-2 firing order. I am yet to run into
a car with a 1-2-4-3 firing order.

My comment of "Somewhere in the world there is a 1-2-3-4 firing order"
however was directed at the fact the "No self-respecting engineer would
design an engine with a firing order of 1-2-3-4 because the power pulses
would be too uneven."

What i ment was that in a world where various types of engine are made there
are a lot of well respected engineers out there who do strange things.

What would make people think that it was ok to cut the V8 engine of a 968 in
half to make a 944 engine. (They DID)
Who would of thought it was ok to make and engine where the crankshaft was
stationary and the cylnders rotated. ( It was done in the early 1900's for
aircraft)
Is it ok to make a motor where the 2 opposing cylinders share a common
conrod and are hard fixed to the pistons because the crank pin runs in a
slide that allows it to move correctly. (Built in australia and is one of
the smoothest running engines ever)
They designed VR6 and its off shoot the W12. For those who dont know a VR6
Motor is a 10 degree V6 originally designed to fit in the space of a inline
4, the W12 is 2 joined together to make a 12 cylinder moter fit into the
space for a V6.
Who thought it would be ok to take a supercharger design in add a sparkplug
to make an engine. ( The rotary is a pretty good engine, whos basic design
stems back to a supercharger design for land speed record motobikes.)
Is it ok to make a motor where one cylinder fires then a gap of 312 degrees
then the next fires, and 408 degrees after that another cylinder fires. That
doesnt produce very even power cycles and it is as rough as guts unless it
has 2 balance shafts, even then it has a unique throb. At least one engineer
thought so as every Harly Davidson is power with that type of motor.

So maybe I miscommunited or maybe you took it wrong, but the fact remaings
that a lot of good engineers do some dumbass things sometimes either to be
unique or becuase they can.

"Nicholas Bourne" <nbourne@optusnet.com.au> wrote in message
news:457a17c4@dnews.tpgi.com.au...[color=blue]
>
> "Ray O" <rokigawaATtristarassociatesDOTcom> wrote in message
> news:42951$4579a629$44a4a10d$2227@msgid.meganewsservers.com...[color=green]
>>
>> "Nicholas Bourne" <nbourne@optusnet.com.au> wrote in message
>> news:457958b7@dnews.tpgi.com.au...[color=darkred]
>>>[/color]
>> <snipped>[color=darkred]
>>>>
>>>> No self-respecting engineer would design an engine with a firing order
>>>> of 1-2-3-4 because the power pulses would be too uneven.
>>>
>>> I have a commodore with a buick based V6 in it that has a 6-1-2-3-4-5
>>> firing order, i'm sure somewhere in the the world is a 1-2-3-4 firing
>>> order.
>>>[/color]
>>
>> The OP has an in-line 4 cylinder engine with cylinder numbers, from front
>> to back, 1,2,3,4, and the firing order is definitely NOT 1,2,3,4 for his
>> engine. IMO, telling him that it could be 1,2,3,4 because it may be that
>> somewhere in the world is not useful advice and is likely to reinforce
>> his notion that 1,2,3,4 is the correct firing order when in fact it is
>> definitely wrong.
>>
>> In the case of an engine with 2 banks like a V or horizontally opposed
>> configuration, there is more than 1 way to number cylinders. For example
>> on a V6 engine, one configuration is to have cylinders 1,2, and 3 on one
>> bank and 4, 5, and 6 on the opposite bank; and another configuration is
>> to have 1, 3, and 5 on one bank and 2, 4, and 6 on the opposite bank.
>> Obviously, cylinder number designation is a big factor in determining
>> firing order.
>>
>> Engineers determine firing order by trying to smooth out, or balance the
>> power strokes with the other 3 strokes of a 4 cycle engine. If the
>> firing sequence had adjacent cylinders on the same bank firing, the
>> engine would be unbalanced. In the case of the Buick engine you cited,
>> note that the firing order sequence is even-odd numbered cylinders,
>> suggesting that the cylinder numbering sequence is odd on one bank and
>> even on the opposite bank. The firing sequence does not have adjacent
>> cylinders on the same bank firing.
>> --
>>
>> Ray O
>> (correct punctuation to reply)[/color]
>
> Fair enough, I should have confirmed that Toyota 4 cylinder engines, be
> they a S series, A Series, etc have a 1-3-4-2 firing order. I am yet to
> run into a car with a 1-2-4-3 firing order.
>
> My comment of "Somewhere in the world there is a 1-2-3-4 firing order"
> however was directed at the fact the "No self-respecting engineer would
> design an engine with a firing order of 1-2-3-4 because the power pulses
> would be too uneven."
>
> What i ment was that in a world where various types of engine are made
> there are a lot of well respected engineers out there who do strange
> things.
>
> What would make people think that it was ok to cut the V8 engine of a 968
> in half to make a 944 engine. (They DID)
> Who would of thought it was ok to make and engine where the crankshaft was
> stationary and the cylnders rotated. ( It was done in the early 1900's for
> aircraft)
> Is it ok to make a motor where the 2 opposing cylinders share a common
> conrod and are hard fixed to the pistons because the crank pin runs in a
> slide that allows it to move correctly. (Built in australia and is one of
> the smoothest running engines ever)
> They designed VR6 and its off shoot the W12. For those who dont know a VR6
> Motor is a 10 degree V6 originally designed to fit in the space of a
> inline 4, the W12 is 2 joined together to make a 12 cylinder moter fit
> into the space for a V6.
> Who thought it would be ok to take a supercharger design in add a
> sparkplug to make an engine. ( The rotary is a pretty good engine, whos
> basic design stems back to a supercharger design for land speed record
> motobikes.)
> Is it ok to make a motor where one cylinder fires then a gap of 312
> degrees then the next fires, and 408 degrees after that another cylinder
> fires. That doesnt produce very even power cycles and it is as rough as
> guts unless it has 2 balance shafts, even then it has a unique throb. At
> least one engineer thought so as every Harly Davidson is power with that
> type of motor.
>
> So maybe I miscommunited or maybe you took it wrong, but the fact remaings
> that a lot of good engineers do some dumbass things sometimes either to be
> unique or becuase they can.
>[/color]
I agree, there have been some pretty unusual engine designs. Most are
attempts to get more power, efficiency, or smoothness, for fuel economy;
save design money or time; fit an engine in a specific space allotted to it;
save weight; or avoid paying royalties. There are sound engineering
principles behind most of the designs you cited, but I cannot think of any
reason for Toyota to design an in line 4 cylinder engine with a 1-2-3-4
firing order when they already had dozens designed.
--

Ray O
(correct punctuation to reply)