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Author Topic: Question of the day  (Read 1947 times)

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Special_Ed

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Question of the day
« on: February 06, 2008, 12:45:57 PM »
My son sent me this question he had in class today.

In a 4 stroke 6 cylinder engine, the fuel injectors open 10 degrees before BTDC. What position will Piston #1 be when the injector opens for #5 cylinder? Firing order is 153624 and the cylinders are 120 degrees apart.

A)   100 degrees BTDC
B)   80 degrees ATDC
C)   130 degrees BTDC
D)   110 degrees ATDC

Answer below:






His book states (B)

I think it’s (D), as does his class. My thought , injector opens at -10 degrees. -10 degrees + 120 degrees (amount of separation between #1 and #5) = 110 degrees or (D)
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naitram

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Re: Question of the day
« Reply #1 on: February 06, 2008, 01:11:57 PM »
does cylinder layout come into play on this?

1    2

3    4

5    6


or

1   4

2   5

3   6
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Special_Ed

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Re: Question of the day
« Reply #2 on: February 06, 2008, 01:19:22 PM »
Quote from: naitram on February 06, 2008, 01:11:57 PM
does cylinder layout come into play on this?

1    2

3    4

5    6


or

1   4

2   5

3   6

My assumption was that it was a in-line 6. I'll ask the question. Waiting on a reply....
« Last Edit: February 06, 2008, 01:22:29 PM by Special_Ed »
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Wrongway

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Re: Question of the day
« Reply #3 on: February 06, 2008, 01:23:41 PM »
 Inline or V it would be "B"
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naitram

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Re: Question of the day
« Reply #4 on: February 06, 2008, 01:24:41 PM »
i was thinking a 120 degree "V" configuration theoretically each cylyinder is following 60 degrees behind

360 degress in a revolution/ # of cylinders
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Special_Ed

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Re: Question of the day
« Reply #5 on: February 06, 2008, 01:26:53 PM »
Just heard back. Because he is at a CAT school it's assumed to be a in-line 6 diesel.
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Special_Ed

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Re: Question of the day
« Reply #6 on: February 06, 2008, 01:28:13 PM »
Quote from: Wrongway on February 06, 2008, 01:23:41 PM
Inline or V it would be "B"

Wrongway, what am I missing? Is there a lag/lead between the 120 degrees of separation?
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Special_Ed

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Re: Question of the day
« Reply #7 on: February 06, 2008, 01:29:21 PM »
Quote from: naitram on February 06, 2008, 01:24:41 PM
i was thinking a 120 degree "V" configuration theoretically each cylyinder is following 60 degrees behind

360 degress in a revolution/ # of cylinders

That's what I asked him this morning.
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Special_Ed

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Re: Question of the day
« Reply #8 on: February 06, 2008, 01:37:44 PM »
Quote from: naitram on February 06, 2008, 01:24:41 PM
i was thinking a 120 degree "V" configuration theoretically each cylyinder is following 60 degrees behind

360 degress in a revolution/ # of cylinders

That being said, -10 + 60 degrees of separation would only be 50 degrees ATDC. I'm missing something....
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naitram

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Re: Question of the day
« Reply #9 on: February 06, 2008, 01:40:31 PM »
me too, i'll stick with hacking
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The Mysterious Q!

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Re: Question of the day
« Reply #10 on: February 06, 2008, 03:58:05 PM »
I believe its 220,221 whatever it takes.  Later,Q
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Re: Question of the day
« Reply #11 on: February 06, 2008, 04:00:16 PM »
Quote from: BigDaddy1569 on February 06, 2008, 03:58:05 PM
I believe its 220,221 whatever it takes.  Later,Q

You are just trouble damn it! HOWIE!! HOWIE!!

 :huepfenlol2:
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Re: Question of the day
« Reply #12 on: February 06, 2008, 04:03:31 PM »
He will be of no help to you. Cuz I have an 88 magnum and it shoots thru schools.
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Re: Question of the day
« Reply #13 on: February 06, 2008, 04:06:43 PM »
Quote from: BigDaddy1569 on February 06, 2008, 04:03:31 PM
He will be of no help to you. Cuz I have an 88 magnum and it shoots thru schools.

You FARGING ICEHOLE! YOU!
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Re: Question of the day
« Reply #14 on: February 06, 2008, 04:07:45 PM »
Whatcha think of my new avatar. I love Bob ross!  You corksorker!
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