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Re: Why did Chrysler change to single rockers? [Re: floridian] #1466259
07/12/13 01:49 PM
07/12/13 01:49 PM
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MICHIGAN
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BB65Barracuda Offline
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MICHIGAN
Quote:

Quote:

conversion kits for Chevrolet race applications.




Last time I checked the cars coming off the assembly line were not made for racing.. While yes I understand the need for different, stronger pars in Nascar, and drag racing, these type of rockers perform pretty well in millions of small and big block chevys...




Its all about money, Not durability or whats good for the consumer.
I had an Escort that had 250K on it, so whats your point?
You can ride a bike for all that matters.
Isnt this thread Why did Chrysler change to single rockers?


1957 Power wagon wm300 original 10.000 mile truck, 1964 dodge Polara Convertible numbers matching
Re: Why did Chrysler change to single rockers? [Re: Kern Dog] #1466260
07/12/13 03:47 PM
07/12/13 03:47 PM
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Posts: 5,385
Pikes Peak Country
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TC@HP2 Offline
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Pikes Peak Country
Quote:

Rick Ehrenberg says it was from the consolidation of the AMC engineers when Chrysler bought AMC/Jeep in the 80s. When the 5.2/5.9 magnum was being developed, the AMC guys insisted on the pedestal mount design.




This is probably the closest to the truth of it all. The Magnum head incorporates some runner designs that are more closely related to the AMC heads than traditional Chrysler small block heads. How else do you think they improved flow, swirl, tumble, and reduced chamber volume. The original Mopar small blocks heads were pretty crappy to begin with so why not clean sheet design them with the ideas form the AMC group. The icing on the cake was now they have a greater parts interchange with other engine families as well, so while the cost per engine may not be significantly less than the shaft system, the cost of ordering ten of thousands of rockers for engine builds over a decade adds up quite a bit.

Re: Why did Chrysler change to single rockers? [Re: babarracuda] #1466261
07/12/13 04:34 PM
07/12/13 04:34 PM
Joined: Jan 2003
Posts: 16,122
Grand Haven, MI
patrick Offline
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patrick  Offline
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Posts: 16,122
Grand Haven, MI
Quote:

For other then high spring pressure and super high RPM engines I think it was:
1. No spacers R/L to get the rocker aligned with the valve stem.
2. Much easier to get the rocker/valve heigth and they are individually adjustable.




actually the magnum pedestal mount (and AMC pedestal mount) ARE NOT adjustable


1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
Re: Why did Chrysler change to single rockers? [Re: patrick] #1466262
07/12/13 04:56 PM
07/12/13 04:56 PM
Joined: Jan 2003
Posts: 1,788
Greer, SC
TooMany62s Offline
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Greer, SC
Take a look to see what Honda, Toyota, MB and BMW use. There you will find the clue to what's cheap and it isn't what they're using.

Re: Why did Chrysler change to single rockers? [Re: TooMany62s] #1466263
07/12/13 05:22 PM
07/12/13 05:22 PM
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MICHIGAN
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BB65Barracuda Offline
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Quote:

Take a look to see what Honda, Toyota, MB and BMW use. There you will find the clue to what's cheap and it isn't what they're using.






1957 Power wagon wm300 original 10.000 mile truck, 1964 dodge Polara Convertible numbers matching
Re: Why did Chrysler change to single rockers? [Re: BB65Barracuda] #1466264
07/12/13 07:55 PM
07/12/13 07:55 PM
Joined: Aug 2003
Posts: 6,301
colorado
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a12superbee Offline
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Quote:

Quote:

Take a look to see what Honda, Toyota, MB and BMW use. There you will find the clue to what's cheap and it isn't what they're using.









This? So the arrogant XXXXX that just cut me off has clothes pins in the engine of his 80k car?
Nice. I feel a bit better now.


I can't afford this. mark
Re: Why did Chrysler change to single rockers? [Re: a12superbee] #1466265
07/12/13 07:57 PM
07/12/13 07:57 PM
Joined: Aug 2003
Posts: 6,301
colorado
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a12superbee Offline
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To stay on topic, I agree, money money money. It's what corporations do.


I can't afford this. mark
Re: Why did Chrysler change to single rockers? [Re: a12superbee] #1466266
07/13/13 10:45 PM
07/13/13 10:45 PM
Joined: Mar 2012
Posts: 27
Southern Indiana
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R/T Lee Offline OP
member
R/T Lee  Offline OP
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Southern Indiana
The theory of AMC and some of their "guys" coming over after the buyout is something I didn't think of. The more I think about it, the more it makes since. I know AMC had a large influence with the 4.0 six. So if Chrysler was looking to lower costs, and the AMC guys was pitching the idea to them to drop the shaft mounts style, they figured they could appease the AMC group, and still get a cost savings...? I love R and D history, thanks for your ideas


NO!! It's not a Nova...

72' Demon 340-727-8 3/4 3.55
69' Charger 440-727-8 3/4
78 Powerwagon 318-727
99' Dakota R/T 5.9
74' Scamp (project)
96' Cherokee 4.0 4x4
Re: Why did Chrysler change to single rockers? [Re: R/T Lee] #1466267
07/14/13 03:13 PM
07/14/13 03:13 PM
Joined: Jan 2003
Posts: 8,005
Tulsa OK
Bad340fish Offline
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Tulsa OK
Quote:

The theory of AMC and some of their "guys" coming over after the buyout is something I didn't think of. The more I think about it, the more it makes since. I know AMC had a large influence with the 4.0 six. So if Chrysler was looking to lower costs, and the AMC guys was pitching the idea to them to drop the shaft mounts style, they figured they could appease the AMC group, and still get a cost savings...? I love R and D history, thanks for your ideas




I would say AMC did the whole 4.0 six and it was ready to go when the buyout happened.

I agree with the guys saying its a cost issue. The pedestal mouns are cheaper, and were a proven idea long before.


68 Barracuda Formula S 340
87 "Chrysler" Conquest
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