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  #6946 (permalink)  
Old 04-08-2013, 08:56 AM
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Well I remember it was to smoothen out the engine roughness and it had nothing to do with firing order. It had to do with piston timing. Saying that it must have involved a change in bank angles or crankshaft journal positions. Or maybe counter weights.
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  #6947 (permalink)  
Old 04-08-2013, 09:21 AM
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Tell me a little about the Odd fire, why did it fire like that, why in the world would they build an engine that fired like that?

Brian
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  #6948 (permalink)  
Old 04-08-2013, 09:24 AM
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It is all to do with piston timing I guess, being I am not so up on the terminology. Why did the "odd fire" even exist? What was the design flaw? And it did by the way have an un even distributor lob spacing!

Brian
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  #6949 (permalink)  
Old 04-08-2013, 09:31 AM
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Quote:
Originally Posted by MARTINSR View Post
It is all to do with piston timing I guess, being I am not so up on the terminology. Why did the "odd fire" even exist? What was the design flaw? And it did by the way have an un even distributor lob spacing!

Brian
It wasn't necessarily a design flaw. the V6 was basically a chopped off V8 and it worked just fine but it lacked the last two cylinders to smooth it out. Without googling any of this I don't know about the distributor.

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Old 04-08-2013, 09:36 AM
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That is what I was after, it was the aluminum block 215 V8 with two cylinders simply cut off and cast in iron! Thus the "odd fire".

It's your floor BB

Brian
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  #6951 (permalink)  
Old 04-08-2013, 09:58 AM
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just a question ,how could you take a 215 cu in engine cut off two cylinders and come up with a 231 cu in engine the v6 is larger than the v8.the 3.8 has 38.3 cu in per cyl 6x 38,3=231 ---8x38.3=307 it was actually a 307 with two cylinders removed some of the v6 still had a distrubitor cap with 8 towers ,

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Old 04-08-2013, 11:16 AM
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Originally Posted by 496CHEVY3100 View Post
just a question ,how could you take a 215 cu in engine cut off two cylinders and come up with a 231 cu in engine the v6 is larger than the v8.the 3.8 has 38.3 cu in per cyl 6x 38,3=231 ---8x38.3=307 it was actually a 307 with two cylinders removed some of the v6 still had a distrubitor cap with 8 towers ,

Back to the original question Why was it called an even fire not what size was it or timing ,I will try to print this

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  #6953 (permalink)  
Old 04-08-2013, 11:45 AM
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Originally Posted by 496CHEVY3100 View Post
Back to the original question Why was it called an even fire not what size was it or timing ,I will try to print this
The question was why was it called an "even fire", the reason is because the previous one was called an "odd fire". The reason being it was a V8 with two cyl cut off leaving a three throw crank and a distributor with an odd spaced cam. It was an "odd fire" being it skipped two cyl as the distributor rotated making a not so smooth running motor. Below is a diagram of the distributor cap showing the even fire V6, Odd fire V6 and V8.

On the V6 being an aluminium 215 with two cyl cut off, I am sorry, it was of that design, just as the 300 Buick motor was basically the same, they used the same water pumps and valve train for instance so I guess it was more the 300 with two cyl cut off. They did have a 340 same basic design I think with only the bore being different than the 300 so maybe the six was basically the 300 but with slightly larger bore?

Brian

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  #6954 (permalink)  
Old 04-08-2013, 12:05 PM
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I was not question your description ,I was takking about factory specs ,it stated 50 +215 or 250 ,what I was referring to is it don't add up but that's what thet claim,,i add up to 231 but the emblems on fenders says 3.8 or 231 cu in.??? I have an 80 buick regal wagon out back with a 3.8 but I don't have anything to compare it to.
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  #6955 (permalink)  
Old 04-08-2013, 12:42 PM
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Quote:
Originally Posted by 496CHEVY3100 View Post
just a question ,how could you take a 215 cu in engine cut off two cylinders and come up with a 231 cu in engine the v6 is larger than the v8.the 3.8 has 38.3 cu in per cyl 6x 38,3=231 ---8x38.3=307 it was actually a 307 with two cylinders removed some of the v6 still had a distrubitor cap with 8 towers ,
Thermodynamic recession pushed through a time portal while using a reduction laser and ice cream. Very easy.

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  #6956 (permalink)  
Old 04-08-2013, 12:54 PM
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Quote:
Originally Posted by 496CHEVY3100 View Post
I was not question your description ,I was takking about factory specs ,it stated 50 +215 or 250 ,what I was referring to is it don't add up but that's what thet claim,,i add up to 231 but the emblems on fenders says 3.8 or 231 cu in.??? I have an 80 buick regal wagon out back with a 3.8 but I don't have anything to compare it to.
That I do not know.

Brian
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  #6957 (permalink)  
Old 04-08-2013, 01:28 PM
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In a four-stroke engine, any cylinder fires once each 720* of crankshaft revolution. An 8 cyl will therefore fire a cylinder once every 720/8 or 90* of crankshaft revolution.

A 6 cyl should fire a cylinder once every 720/6 or 120*. HOWEVER - a 90* V6 cannot do this unless you make the engine longer by having a separate throw for each cyl. (Draw it up, you'll see) A 60* V6 has no problem with a smooth, even-firing order and lighting one off every 120* (and usually has a firing order like 1-2-3-4-5-6)

Because of the crank design on the original (V8 derived) 90* V6 it could NOT fire cylinders with an even spacing of firing order (oddfire)

Later versions DID use separate throws for each cyl to get the spacing right (evenfire) but this necessitated a whole new block with the banks more staggered than is the case on a V8
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  #6958 (permalink)  
Old 04-08-2013, 01:50 PM
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Not ice cream?

BB
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  #6959 (permalink)  
Old 04-08-2013, 08:58 PM
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Here is one that you can get bonus points on.

Year make and model of automobile.

Extra" atta guys" if you can identify the accompanying trailer.

Outstanding trailer!!

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  #6960 (permalink)  
Old 04-08-2013, 09:36 PM
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I recognized the trailer, so about 10 seconds worth of Gargoyle time and I found the complete answer. Since I Giggled it, I won't supply the answer here (that's cheating!)

And I still - to this day - do NOT understand the front "bubble" on the trailer, and have not found an answer to THAT aspect of it, on any site that Gaggle can link me to

Nor do I understand why the trailer has its own headlights!
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