"traderQAMobileTestAutomationMobileBoostOn" (el-peasant)
09/28/2015 at 19:29 • Filed to: None
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"traderQAMobileTestAutomationMobileBoostOn" (el-peasant)
09/28/2015 at 19:29 • Filed to: None | 0
| 11 |
While this refers to about any car, I mainly have vintage muscle cars in mind with this.
What made Chrysler think “This engine should be 426 ci” Why not 425? 427?
What made GM think “This engine should be 350 ci” Why not 349? 351? 879?
I see that around the 7.0L mark was common (Ford/Chevy 427, Chrysler 426, Ford 428/429)
Also the 7.5-ish L mark (Olds/Pontiac/Buick 455, Chevy 454, Ford 460)
I must say, the numbers “427” and “454” do roll off the tongue quite well.
ly2v8-Brian
> traderQAMobileTestAutomationMobileBoostOn
09/28/2015 at 19:37 |
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Just sort of happens I think. They set out with certain specs they’d like to use, like a certain bore or stroke. What pistons and combustion chamber they use would've factored in. Of course they made sure the result had a bigger number than the other guy too, because bigger number=better in the simple reasoning of the end user.
CRider
> traderQAMobileTestAutomationMobileBoostOn
09/28/2015 at 19:45 |
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The question isn’t “why?” the question is “Why not?”.
Mr. Ontop, No Strokes, No Smokes...Goes Fast.
> traderQAMobileTestAutomationMobileBoostOn
09/28/2015 at 19:49 |
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I had a 455 and it rolled down the street quite well.
lone_liberal
> traderQAMobileTestAutomationMobileBoostOn
09/28/2015 at 19:50 |
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These days I’m sure there is a lot of modeling and calculating about different strokes and bores and their volumetric efficiency. I’m sure there was some of that back then and also a lot of trial and error. Remember, that 350 started out as a 265.
Berang
> traderQAMobileTestAutomationMobileBoostOn
09/28/2015 at 19:54 |
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I would think it was primarily a matter of competing with other companies - being able to market a similar product. But insurance and engineering factors would have played into it as well.
I’m sure they were not seeking a specific to the cubic inch displacement, rather than thinking we want around this much engine, we want around this much stroke, etc.
That Bastard Kurtis - An Attempt to Standardize My Username Across Platforms
> traderQAMobileTestAutomationMobileBoostOn
09/28/2015 at 20:02 |
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I think the only time they really set out to get to a certain displacement is when there’s a rule (like 305ci in the Trans Am series) or when they’re trying to get to a classic displacement (7 liters, for example). Though there’s always a little creative accounting there as well...a Ford 302 is slightly less than 5.0 liters.
TheHondaBro
> traderQAMobileTestAutomationMobileBoostOn
09/28/2015 at 20:02 |
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Longevity of the engine. If it were too big, then it would generate more power than it could manage. I imagine a graph is involved.
signintoburnerlol
> TheHondaBro
09/28/2015 at 20:28 |
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History shows us that larger engines working at lower compression last longer than smaller engines at a higher compression. AKA Over working themselves.
camaroboy68ss
> traderQAMobileTestAutomationMobileBoostOn
09/28/2015 at 20:54 |
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I think they worry about bore and stroke relation and what the goals of the motor will be and then see what they have and then marketing will see if they can then market it at the displacement engineering came out with or if they need to fudge it a little.
A case where marketing messed with displacement numbers would be in 1969 Chevy engineers bored the 396 to a 402 big block. Though since there was already a huge chunk of advertising in the 396 they left all the badging 396 on Camaros, Chevelles and Novas.
TheRealBicycleBuck
> traderQAMobileTestAutomationMobileBoostOn
09/28/2015 at 21:52 |
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I would wonder about interchangeability of parts. This link provides some insight for Fords. http://diyford.com/ford-big-block…
Looks like they started with a four-inch bore and developed three different engines ( 332/352/361) b y changing the stroke. There are limits to how long of a stroke you can build into an engine, so to get more displacement, the bore size had to be increased, setting the stage for a new series of engines with the same bore but different strokes.
wafflesnfalafel
> traderQAMobileTestAutomationMobileBoostOn
09/28/2015 at 22:47 |
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Not as related to big US v-8s, but some countries, (most notably Japan,) had regulations which favor certain displacement engines.