Big Bang Inline-4 firing pattern? - Honda Motorcycles - FireBlades.org
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post #1 of 36 Old 08-25-2004, 10:14 AM Thread Starter
 
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Big Bang Inline-4 firing pattern?

Anyone know where to find info on the firing pattern for modern inline-4's? I was trying to explain it to some one but couldn't do it justice and I don't know the crank pin position. It's gotta be like 90 degrees or less right? Anyone know or have a link to any information about the Big Bang firing pattern?

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post #2 of 36 Old 08-25-2004, 11:21 AM Thread Starter
 
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Re: Big Bang Inline-4 firing pattern?

This is all I could find so far. It doesn't really explain it in terms of modern 4-strokes though. The only other things I could find were stuff on Rossi going back to that pattern for traction control.

http://www.superbikeplanet.com/nsr500mat.htm

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post #3 of 36 Old 08-25-2004, 1:58 PM
 
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Re: Big Bang Inline-4 firing pattern?

1 3 4 2

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post #4 of 36 Old 08-25-2004, 2:57 PM
 
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Re: Big Bang Inline-4 firing pattern?

there is an excellent Bike article I have at home about every type of engine configuration. I'll try to dig it up tonight and get the specs on it. I remember it talking about firing order and specific crank spacing and the impact it makes at the contact patch.

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post #5 of 36 Old 08-25-2004, 3:14 PM
 
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Re: Big Bang Inline-4 firing pattern?

Quote:
Originally Posted by 2OHOH2
1 3 4 2
All l4's have that firing order. In addition, Both inner pistons go up and down at the same time as do the outer pistons. The outer and inner pistons are separated by 180 degrees. Each time one pair of pistons is up, one of them fires (it's completing its compression stroke and starting its power stroke). The other piston is completing its exhaust stroke and begining its intake stroke. Remember that one complete cycle is 720 degrees of rotation.

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post #6 of 36 Old 08-25-2004, 3:22 PM
 
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Re: Big Bang Inline-4 firing pattern?

Quote:
Originally Posted by nedro
All l4's have that firing order. In addition, Both inner pistons go up and down at the same time as do the outer pistons. The outer and inner pistons are separated by 180 degrees. Each time one pair of pistons is up, one of them fires (it's completing its compression stroke and starting its power stroke). The other piston is completing its exhaust stroke and begining its intake stroke. Remember that one complete cycle is 720 degrees of rotation.
So in other words, you're confirming what I said


Shrub, does that answer your question?

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post #7 of 36 Old 08-25-2004, 3:28 PM
 
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Re: Big Bang Inline-4 firing pattern?

Quote:
Originally Posted by 2OHOH2
So in other words, you're confirming what I said


Shrub, does that answer your question?
Uh...Ya.

BTW Kimosabi, what the hell is crank pin position?

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post #8 of 36 Old 08-25-2004, 4:10 PM
 
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Re: Big Bang Inline-4 firing pattern?

It's not the firing order that makes a Big Bang engine different it's the phasing.....

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post #9 of 36 Old 08-25-2004, 4:34 PM
 
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Re: Big Bang Inline-4 firing pattern?

Quote:
Originally Posted by Baketech
It's not the firing order that makes a Big Bang engine different it's the phasing.....
At what point does the flux capaciter kick in?
Explain phasing if you wouldn't mind please.

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post #10 of 36 Old 08-25-2004, 4:46 PM
 
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Re: Big Bang Inline-4 firing pattern?

Quote:
Originally Posted by nedro
At what point does the flux capaciter kick in?
Explain phasing if you wouldn't mind please.
Same thing Shrub is talking about...the "pattern" or "phasing" or "crank pin timing".....as opposed to the order.

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Re: Big Bang Inline-4 firing pattern?

think where the rods connect to the crank relative to all the other cylinders.

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post #12 of 36 Old 08-25-2004, 4:54 PM
 
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Re: Big Bang Inline-4 firing pattern?

Quote:
Originally Posted by nedro
At what point does the flux capaciter kick in?
Explain phasing if you wouldn't mind please.


"phasing"? That doesn't have anything to do with Dilithium crystal 5th wave resonance, when combined with Unobtanium, does it?

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post #13 of 36 Old 08-25-2004, 4:56 PM Thread Starter
 
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Re: Big Bang Inline-4 firing pattern?

Exactly...if you read the article I linked to above it says that Mick's NSR500 was originally set at 180 degrees so that every 180 degrees a piston would fire. That produced the most horsepower but it also caused the rear wheel to break loose 4 times per revolution rather than just once. They changed the firing pattern to 70 degrees so that all the pistons fire within 70 degrees of rotation causing the rear wheel to have increased stress only once and then for 650 degrees of rotation it would have perfect traction. Make sense? I just wanted to know (now) whether 70 degrees of "phase" is the norm on 4-stroke inline-4's like the 929 or 954 or is it some other degree?

Val Rossi struggled with the same problem. Yammie set his bike up for the most HP and he told them to change the firing pattern so that he had more traction.

-Shrub (aka Kemosabe)

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Last edited by WetShrub; 08-25-2004 at 4:57 PM.
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post #14 of 36 Old 08-25-2004, 4:56 PM
 
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Re: Big Bang Inline-4 firing pattern?

Think RC30.....or Twin Twingle.....

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post #15 of 36 Old 08-25-2004, 5:00 PM Thread Starter
 
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Re: Big Bang Inline-4 firing pattern?

I just started those motorcycle mechanics courses and the teacher was talking about all this stuff but had never heard of the big-bang firing pattern so I was trying to explain it to him.

https://www.fireblades.org/forums/sho...hlight=college

-Shrub

To the optimist, the glass is half full. To the pessimist, the glass is half empty. To the engineer, the glass is twice as big as it needs to be.

Last edited by WetShrub; 08-25-2004 at 5:02 PM.
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