New article today over at Hotrod: How to Build a Lightweight 650-hp Big-Block Mopar for the Street

Engine, Trans & Driveline

  1. Imperial One

    Imperial One FBBO Gold Member FBBO Gold Member

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    • Dodge 330

      Dodge 330 Well-Known Member

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      Wow, was really interested in this until I saw the times.

      "Best e.t. of 11.25 @ 121mph." seems to be a gross underperformer to me! This car should easily be running low 10's, high 9's with the parts described and the weight. Typical magazine underperformer.
       
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      • Imperial One

        Imperial One FBBO Gold Member FBBO Gold Member

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        Back in the day (early '80's), Larry Shepard over at Direct Connection figured that for the 9.90 class you needed to make 600 hp in a 2800 pound car. I bet quite a few guys here remember Mopar doing the work up on the 9.90 car. Duster with a tunnel rammed 440 with twin dominators as I recall. Should be better today with the new technology. So with 650 HP you'd hope 9.90 would be a baseline.
         
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        • Dodge 330

          Dodge 330 Well-Known Member

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          I did the exact exact times they did with way more weight and way less cam and head! It's almost like it had a dead cylinder?!
           
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          • Imperial One

            Imperial One FBBO Gold Member FBBO Gold Member

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            .750 roller in that one, again, as I recall. I can't remember anything about the heads, but probably regular iron heads with 2.14 and 1.81 valves, ported and polished with triple springs. Probably too early for Aluminum B engine heads back then (but I stand to be corrected).
             
          • theman440

            theman440 Well-Known Member

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            My Indy EZ headed .030 over 440 went 10.53@126 in a 3650lb car.
             
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            • #41

              #41 Well-Known Member

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              Looking at the car my guess is lack of traction = the bad times. Its not the engine build.
               
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              • Dodge 330

                Dodge 330 Well-Known Member

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                The mph says different. 121mph no matter lack of traction not.
                 
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                • DeltaV

                  DeltaV Beam us up! FBBO Gold Member

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                  There's fast cars and there's fast driver's:D
                   
                • fratzog lover

                  fratzog lover Well-Known Member

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                  Nice restrained cam still makes good power. Sounds like a hoot in a street cruiser.
                   
                • Green72

                  Green72 Well-Known Member

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                  Any idea why I'm not able to view the link? Only the Hot Rod articles are a problem
                   
                • Imperial One

                  Imperial One FBBO Gold Member FBBO Gold Member

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                  Try looking on a different device. Way too many variables to guess what your problem is.
                   
                • #41

                  #41 Well-Known Member

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                  If they get it took hook once it gets rolling, absolutely. But we're just guessing. The guys at Hotrod should have explained it. They know better. If I was one of the brands that supplied parts to that build I'd sure would have wanted them to give an explanation!
                   
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                  • 67charger383

                    67charger383 Well-Known Member

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                    I want one of those mod man intakes!
                    I could put a 8-71 on my 383 :D
                     
                  • RemCharger

                    RemCharger Well-Known Member

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                    I read the drag test, time slips are from 2015.
                    One thing though, the dyno rate was 600 rpm/sec.. isn't it usually 300?
                     
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                    • BDF6

                      BDF6 FBBO Gold Member FBBO Gold Member

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                      I think the write up is mainly a really long Indy advertisement.
                       
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                      • Dodge 330

                        Dodge 330 Well-Known Member

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                        Pretty much.
                         
                      • Mark Barnes

                        Mark Barnes Well-Known Member

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                        Just another "opinion". It's much easier to write articles about building a lightweight 650 hp. BB Mopar WHEN YOU'RE USING SOMEONE ELSE'S CHECKBOOK.
                        My reality is that I couldn't afford HALF that shit, and neither could 99% of the assholes that wrote/participated in the article.
                         
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                        • IQ52

                          IQ52 Well-Known Member

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                          600 rpm/sec is still common in places. But.......there are some sissy-cake engines that just might blow up at 300 rpm/sec.......

                          ............At least that is what I was told before a dyno contest I was at years back.

                          The previous year the test was run at 600 rpm/sec and this year it was to be 300 rpm/sec. One of the competitors balked at running a load of 300 rpm/sec because it would be "too hard on the engines". My son and I walked away from that conversation with both of us grinning ear to ear.

                          The contest hadn't even started yet and our lowly pump gas 451 had 50+ dyno runs at 300 rpm/sec......all @ 720+ HP.
                           
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                          • 69sunfireGTX

                            69sunfireGTX Well-Known Member

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                            You can tell all of that without even knowing all of the specs? Or am I missing something here because I couldn't find them. It looks like a high horsepower street car to me that is not optimal for the track.

                            If you know all of the specs please let us know so we can come up with our own conclusions
                             
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