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Re: Aluminum Vs. Graphite Block [Re: We The People] #769755 08/10/10 04:22 PM 08/10/10 04:22 PM
Joined: Feb 2007 Posts: 6,295 U.S. M moparniac master
moparniac master M Joined: Feb 2007 Posts: 6,295 U.S.	Quote: If I had a bunch O'cash I might use an alum. block on the street just for the low weight. but you dont need it for 625 hp. I run 660 in a stock 72 hp2 at the track. did you cut down your vent tubes or something? Mopar Performance

Re: Aluminum Vs. Graphite Block [Re: MRMOPAR622] #769756 08/10/10 07:42 PM 08/10/10 07:42 PM
Joined: Jan 2003 Posts: 6,142 Melbourne , Australia LA360 master
LA360 master Joined: Jan 2003 Posts: 6,142 Melbourne , Australia	Quote: I have one more question. Do you think there is enought horespower advantage in a steel block to make up for the extra 100 lbs or so? Indy says the Maxx aluminum block is a 110 lbs lighter than the cast iron block. No one has mention that yet. I was just curious. How much extra horsepower would it take to make up a 100 lbs? I can't find my Moroso(sliderule) calculator. Unless the rules dictate otherwise, Pro Stock would be all over Aluminium blocks if there was an advantage. The Compacted Graphite Iron block are much more stable, hence why they are used in Diesel engines and Pro Stock, Comp Eliminator and the like. Alan Jones

Re: Aluminum Vs. Graphite Block [Re: HitIt] #769757 08/10/10 07:53 PM 08/10/10 07:53 PM
Joined: Dec 2006 Posts: 3,667 Arizona C Chris'sBarracuda master
Chris'sBarracuda master C Joined: Dec 2006 Posts: 3,667 Arizona	Quote: Why the difference in power? The weight makes up for it. Don't worry about that. It really depends mostly on what your long term plans are. If you are happy with 650 hp and never plan on going any faster, then a stock block is a good choice. If you want to go real fast later, the Aluminum Block is a great choice for expanding your horizons.. It's ultimately your choice.. I have Aluminum Block, and would never go back.. But that's me.. Just my opinion.. Have Fun either way. Chris...

Re: Aluminum Vs. Graphite Block [Re: MRMOPAR622] #769758 08/11/10 04:42 AM 08/11/10 04:42 AM
Joined: Aug 2009 Posts: 14 Europe BB 70 Challenger member
BB 70 Challenger member Joined: Aug 2009 Posts: 14 Europe	Quote: I have one more question. Do you think there is enought horespower advantage in a steel block to make up for the extra 100 lbs or so? Indy says the Maxx aluminum block is a 110 lbs lighter than the cast iron block. No one has mention that yet. I was just curious. How much extra horsepower would it take to make up a 100 lbs? I can't find my Moroso(sliderule) calculator. This is an interesting topic. I have been thinking this very same thing myself, also. So, I found this info on "Mopar Engines West" pages: * (4/16/04) Okay, okay... We have had several emails from people that feel there's another "con" we need to mention if your building an all out race motor. Everything else being equal, the aluminum motor will make a little less horsepower. We have seen as much as 20 HP, on the dyno, on 900 HP motors. This is because the engine is basically an air pump AND a heat engine, and it's harder to keep heat in an aluminum motor. Also, aluminum moves around more, so ring seal varies at very high cylinder pressures. But this only affects all out race motors. On a street motor it would be hard to measure any difference, and any slight decrease in HP would be more than offset by the decrease in weight. http://www.moparengineswest.com/No_Blocks.htm

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