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- Path: sparky!uunet!zaphod.mps.ohio-state.edu!howland.reston.ans.net!sol.ctr.columbia.edu!emory!rsiatl!hotrod
- From: hotrod@dixie.com (The Hotrod List)
- Subject: Re: RPM's and Gears
- Message-ID: <0l-sl9h@dixie.com>
- Date: Fri, 22 Jan 93 21:35:42 GMT
- Organization: Dixie Communications Public Access. The Mouth of the South.
- To: hotrod@dixie.com
- Reply-To: hotrod@dixie.com
- Posted-Date: Friday, Jan 22 16:35:38
- X-Sequence: 3588
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- Approved: jgd@dixie.com
- Lines: 56
-
- Dennis responds
- > JCA wrote
- >> Although I am a firm Chevy man for drag racing, I hesitate to categorize
- >> any particular manufacurer's engines as weak or strong...
- >> The mopar engines I have known (I haven't owned any personally)
- >> have been stronger than Hell! A friend has run a 340 in his Barracuda drag
- >> car for several years that he _launches_ at 9,000 RPM and shifts at
- >> 11,800 RPM!!!! He also has a B1 Wedge motor that he runs to 10,000 RPM.
- >> Of course my best friend used to shift his LS-6 crate 454 at 7500 RPM
- >> without any problems. Another friend shifts his 327 Chevy II wagon
- >> (street car) at 8,500 RPM.
- >
- >Now may I ask if these are stock engines.
- HEEEELLLL NO! (extra emphasis ;-) The LS-6 was (when he used to shift at
- 7500 RPM) a stock engine. [We went back through it for more power!]
- Is there a stock "Big 3" automobile engine that can reliably turn 10,000
- RPM? The (now extinct) LS-6 crate motor is the same engine that found
- it's way into _lots_ of 70-72(?) SS454 Chevelles...
-
- >I have seen quit a few stock 426
- >wedges and 440's that dropped there bottom ends. I also know of a couple
- >Hemi's that had complete bottomends put in and are shifted at 10,000 rpm's.
- No design is immune to failure; I suppose some are more prone. OK, for
- stock configurations, I concede that the Chevies are very durable. (I've
- just seen too many big block mopars have the dog shit run out of them and
- hold together!)
-
- >> I guess where my basic disagreement comes in is that lower gears is not always
- >> the correct solution to a performance problem. Many years ago my '68 396
- >> Chevelle was set up with 3.30 gears with a basic "torque" engine configuration.
- >> (made all of it's power below 6,000 RPM)
- >> Because my street tires were so short (245 60 R 14s - had ~24.5" diameter)
- >> The car actually got slower in the quarter when I switched to 4.11 gears.
- >
- >Sounds to me like too much torque and not enough bite into the pavement.
- With ladder bars, racing springs and shocks, battery relocation, and lots
- of fiberglass parts that car has absolutely _NO_ problem hooking up (then
- or now!) On a side note, my around-town gas mileage actually went up when
- I made the gear change! Cool, huh?
-
- >... It seems like 45
- >souls out there cannot believe that anything over a 4.11 is a performance
- >axle. Guess there more interested in the salt flats than minimizing there
- >ET's.
-
- Hee hee, I guess some of us are just a little more radical than others...
- I think the most important thing we agree on (the golden rule of performance)
- is that _all_ of the parts that make up a combination really need to match
- to get any sort of respectable result, otherwise the parts just end up
- "fighting" each other...
-
- Later,
- JC. jca@fibercom.com
-
- ----------
- Posted by: emory!fibercom.com!jca (J.C. "J. Hoss" Akers)
-