GM offers a GRAPHITE block - Team Camaro Tech
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post #1 of 6 (permalink) Old Apr 23rd, 04, 05:15 PM Thread Starter
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Join Date: May 2001
Location: Ashby,MN, USA
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just got the 2004 GMPP catalog, and on page 111 they have a new DRCE engine block- made out of "compacted graphite". part number 25534406.
sure, it's made for 500 inch NHRA Pro Stockers, but when is this gonna trickle down to the small blocks? i think this is as close as we'll see to an actual carbon fiber engine block.
just think- and engine block capable of holding 2000 hp made out of pencil lead..

you don't plan sincerity.
you have to make it up on the spot.

wanna hear about 20 years ago when i was too smart to know any better?
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post #2 of 6 (permalink) Old Apr 23rd, 04, 06:45 PM
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I don't know if it will turn up by using a web search but years ago I read an article about a plastic Indy type proto-type motor.

It was called a "Poly-Motor" or Poli-Motor or something like that.

It had, (if I remember right), plastic/carbon fiber block, a carbon fiber crank, c/f rods and maybe even ceramic valves and piston tops and ceramic valve springs and I THINK it ran without oil??

I never did hear how it finally turned out but just maybe the R&D on it ended up in this block now offered by GMPP???


PS., totally off the subject unless it is lightweight block construction is that the late '40's Crosley Hot Shot SOHC motors were actually brazed together sheetmetal and sleeves and was a very light little gear drive SOHC motor.

Here is something on it.

"The most revolutionary feature, though, was the method of block construction. First of all, this was in unit with the cylinder head and detachable from the crankcase. Secondly, and more important, instead of being cast as all other engine blocks were and are, it was built up from an assembly of steel tubing and stampings. These parts were assembled in a jig, then copper brazed together at high temperatures, which also served to heat treat the cylinder walls and valve seats to bring them up to a high degree of hardness. Water jackets and passages were lined with a plastic material for anti-rust purposes, and all outside parts had some kind of stiffening ribs or fins cast into them for high rigidity. Machining operations consisted of trueing the bottom of the block where it meets the crankcase, boring the camshaft bearings and boring and honing of cylinder walls and cam follower guides. The block was bolted to the aluminium crankcase, with the hold-down bolts also serving as bolts for the main bearing caps.
The result of all this innovation was a engine that weighed only 59 lbs. without accessories. It put out 26 hp at 5200 rpm, and had a compression ratio of 7.5:1. The copper brazing process gave it its unusual name, COBRA."


Interesting reading to say the least even if corrosion finally ruined the little motors before they went to cast-iron!!

More reading at;

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post #3 of 6 (permalink) Old Apr 24th, 04, 10:13 AM
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....And it's on sale now, unmachined, for only $6,300


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post #4 of 6 (permalink) Old Apr 24th, 04, 01:46 PM
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Is this what the compacted graphite cast-iron is;

or is it iso-statically pressed graphite that is high fired to create some sort of graphite/ceramic material??

If it is, it's alotta money for some new grade of cast-iron, imho!!

Why don't they just make the block out of ductile-iron or even maleable-iron instead?? I'm not a cast-iron materials guy so am just asking??


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post #5 of 6 (permalink) Old Apr 24th, 04, 01:54 PM
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and you'd think for that price they would at least finish hone it and bore for lifters . . .

E85 racer and E85 carb builder

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68 Camaro, E85 powered 427" small block. 9.96 @ 133 MPH, 1.319 sixty foot on motor. 5.92 eighth @ 116 with a 1.42 sixty breaking beams with back tire on the bottle
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post #6 of 6 (permalink) Old Apr 25th, 04, 05:37 AM
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how much does she weigh?


- '68 Chevy Camaro (sort of done, but always subject to improvement)
- '63 Pontiac Tempest (work in progress)
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