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AMS 2.3rr and Cosworth 2.2 short block

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Old Aug 20, 2008 | 09:21 AM
  #46  
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460 bhp???
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Old Aug 20, 2008 | 03:12 PM
  #47  
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Originally Posted by kouzman
let me tell you. Cossie strokers hold more than double than the number that Cosworth suggests.... and thats in awhp....
Of course it does, and it better since motors that cost <1/2 of the price do the same. But that isn't why they quote this figure.

They put a '460bhp' clamp on the claim because they know that when someone inevitably puts double that amount through it, and he wears out that $9300 USD short block faster than expected, he can't go crying to them about it. This will happen as certain as death and taxes.

Idiots have money too.
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Old Aug 20, 2008 | 03:53 PM
  #48  
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I think Ted B might of already mentioned but our motor is also much more compete. We dont just give you an assembled shortblock. We give you a new oil pump, water pump and Custom head gasket.

Eric
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Old Aug 20, 2008 | 07:54 PM
  #49  
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Originally Posted by Ted B
Pauter is a forged rod. The Cosworth rods are listed as forged rods. Forged rods are not as strong as a good billet rod, so neither represent the best possible choice.
Ted, I'd be interested in your basis for this opinion. From my prior reading, the forging process imparts strength advantages which simply carving a rod out of billet does not, particularly if the forging is done to optimize. Is that incorrect?

By way of example, here's a quote from a forged aluminium rod manufacturer:

"Following extrusion, BME’s die-forging process shapes the aluminum and compresses its grain structure by heating it to 700°F then applying pressure of 2200 tons. Compared to rods which are simply cut out of flat stock, BME’s forging process: 1) significantly enhances grain flow and increases grain density. 2) forces the grain of the extrusion into the connecting rod shape and, more importantly, aligns that part of the grain which makes up the rod's tapered beam with the direction of highest stress the rod will sustain in a running engine and, 3) forces the grain around the rod bearing bore, creating a "hoop stress" phenomenon that provides maximum strength for the limited cross-section available at the rod’s big end.

In the early 1990s, during research into the strength of connecting rod materials which eventually resulted in Bill Miller Engineering's switch to a different type of aluminum, Alcoa conducted fatigue life comparison tests which showed failures are caused chiefly by stress due to severed grains and improper gain direction. With a connecting rod machined from a plate, any machining severs grain ends. If this machining is done to critical sections of the rod, such as the beam or the big end, severed grain ends weaken the rod. If remaining uncut grains are not aligned in the proper direction, the rod will be further weakened.

A BME Rod’s taper, because it results from the forging process rather than machining, does not expose grain ends. In a conventional aluminum rod, cut from flat-stock; grain length is cut off by the rod bearing bore, again, exposing the grain ends. In contrast, the forging process used by Bill Miller Engineering forces the grain around that bore. Better grain flow, higher density, grain aligned with the direction of most stress, tapering which does not cut the grain and big end grain formed around the rod bearing bore are just a few reasons for a BME Rod’s exceptionally long fatigue life."
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Old Aug 20, 2008 | 08:47 PM
  #50  
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Originally Posted by CO_VR4
Ted, I'd be interested in your basis for this opinion. From my prior reading, the forging process imparts strength advantages which simply carving a rod out of billet does not, particularly if the forging is done to optimize. Is that incorrect?
From the little that I know, most billet is cut from forged metal. Does that make sense?
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Old Aug 20, 2008 | 09:17 PM
  #51  
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Originally Posted by Erik@MIL.SPEC
From the little that I know, most billet is cut from forged metal. Does that make sense?
No. Most references to "billet" mean homogenous castings, that are not forged at all. In other words, billet is not compressed by pressure, while forgings are, and that pressure changes the grain structure in the forging, which is a way to induce strength through compression of the material, as well as orient the grain structure in the strongest direction for the particular stress for which the part is likely to be used.
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Old Aug 20, 2008 | 11:25 PM
  #52  
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This is what I was referring to. It seems this particular company forces their metal through a die:

"Unlike a forging in which the aluminum is literally pounded into the shape of a rod, our material is is cold worked, forced through a die at extreme pressures, to form the billets from which the rods are CNC'ed from."
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Old Aug 21, 2008 | 04:05 AM
  #53  
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From: pakistan
hey ,plz tell me how much can i rev my standerd stage 4 2.3l short block ?
im running jam stage 4 wid venolia and oliver combination ..
i want to run 8500 just for the races and 8200 daily so plz tell me that can do this .
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Old Aug 21, 2008 | 05:39 AM
  #54  
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Originally Posted by CO_VR4
No. Most references to "billet" mean homogenous castings, that are not forged at all. In other words, billet is not compressed by pressure, while forgings are, and that pressure changes the grain structure in the forging, which is a way to induce strength through compression of the material, as well as orient the grain structure in the strongest direction for the particular stress for which the part is likely to be used.
Actually true billet istock s indeed a forging of a single billet of metal. It is not cast (as per the misconception of one forged rod maker). When a single billet is forged, the metal grain structure is homogenous throughout.

A forged rod means the hot metal has to be forced into the general shape of the rod. When this is done, it is squeezed around the big end, which means the grain is stretched and distorted around the big end. Where the grain has to be stretched and twisted into a contoured shape, the distortion creates inconsistencies that presents a potential weak link.

A billet rod is CNC machined from the homogenous billet, which preserves the flow of the grain. Despite the contours of the rod, the grain all flows in the same direction, and is without distortion.

Billet rods cost more to make, but yet some forged rod makers charge the same price (or more). I know of at least one example of a popular Chinese-made H-beam forged rod that wholesales for around $35 per unit.

There are conflicting opinions to be found within the industry, and that's fine. Some of them appear to be purely geared toward marketing, but that is expected.

This same theory applies to crankshafts. This doesn't discount the usage of a good forged rod and/or crank. There's nothing wrong with it, and some have a very good reputation. Even the factory forged rods and crank used for EVOs rarely break. Where they are the same price however, I'll take domestically-made billet components 10 times out of 10. And of course, since we aren't even mentioning the latitude the maker may use when selecting the quality of base material, this assumes all else being equal.

And as for aluminum, there may be differences between aluminum billet stock preparation and steel, I don't know. I do know that I've see more broken aluminum rods over the years than anything else, but fortunately, I don't need them.

Last edited by Ted B; Aug 21, 2008 at 06:09 AM.
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Old Aug 21, 2008 | 06:59 AM
  #55  
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From: Hellas
Originally Posted by SpunEvoIX
you can also look into the magnus 2.2 stoker kit...it has pauter rods and ross pistons and a billet crank.... thats what i am running right now and i rev it to 9,000 rpm no problem
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Old Aug 28, 2008 | 01:48 PM
  #56  
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crazy
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Old Sep 21, 2008 | 02:22 AM
  #57  
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I'm very impressed. I'll be giving you a call to get more info.



Originally Posted by AutoMotoSports
I think Ted B might of already mentioned but our motor is also much more compete. We dont just give you an assembled shortblock. We give you a new oil pump, water pump and Custom head gasket.

Eric
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Old Sep 21, 2008 | 02:53 AM
  #58  
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I have 2.2 cosworth shortblock + cosworth race head + AMS GT42R
Car makes 850hp, reving up to 10000 without any problems.
I wasnt trying AMS 2.3RR but Cosie is very impressive
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Old Sep 21, 2008 | 03:01 AM
  #59  
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From: Spec Ops
2.3RR would be a better choice.
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