ProComp/Speedmaster aluminum heads

Mopar Racers Forum

  1. j par

    j par Well-hung Member

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    Actually that's a good idea I will just p. M. People and ask them questions...
    If you want to look at every single turn there's three teen right behind me with a comment and generally it has nothing to do with the subject...
    Or better yet the ignore button for a little while till I can get back on the ground...
     
  2. j par

    j par Well-hung Member

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    Let's see how that works?..
    I was asking a question about quench five pages ago?...
     
  3. 318willrun

    318willrun Stomper 4x4... we kept energizer in business

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    reality can be harsh. breathe... breathe..... LOL
     
  4. j par

    j par Well-hung Member

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    I quoted myself one more time (from five pages ago) to see if there's any chance of getting this back on track and also put the agitator on ignore so we can carry on...
     
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    • pittsburghracer

      pittsburghracer Well-Known Member

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      1BFDDF77-3EBF-478A-89E7-C2ECEB95FAB4.jpeg C6A1DCA4-825F-4F32-9164-EEE8F18F0322.jpeg C95668B7-1023-48C7-8F14-527BB4F6879E.jpeg 2F0CB39A-A3EB-4013-9AE5-E84201D76191.jpeg My contribution for the day
       
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      • j par

        j par Well-hung Member

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      • pittsburghracer

        pittsburghracer Well-Known Member

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        I’ve said my piece on this subject many times on different posts. My cars are drag race only so I don’t have to deal with the street driving, street behavior issues. All I’ve heard during most of my 44 years of engine building is quench, quench, quench. Meanwhile my W2 headed engine and Edelbrock headed engines were both open chamber heads with below deck flat top pistons. Both easily ran 9’s. I don’t always go by the book.
         
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        • j par

          j par Well-hung Member

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          Thank you for that. I was just because like you said people talk about it so much wondering if there would be any characteristic change in the way it ran sounded or was tuned?..
          It doesn't sound like you have that direct comparison answer?..
           
        • oldkimmer

          oldkimmer FABO Gold Member FABO Gold Member

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          Let me try for what it’s worth. I have switch open chambers to closed on a few big blocks. They seemed to run about the same. They did sound crisper. They also had a little more power. This was on higher mileage engines. Kim
           
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          • j par

            j par Well-hung Member

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            More power is good:thumbsup:...
             
          • pittsburghracer

            pittsburghracer Well-Known Member

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            Higher compression? Fresh valve job, guides, and seals. We can’t give quench credit for seat of the pants performance gain.
             
          • fishmens67

            fishmens67 Well-Known Member

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            plain and simple, squish speeds up the charge and spreads it even across the open chamber, for a more even explosion
            Squish physically mixes the flame with the mixture making the burn more rapidly, thus reducing detonation
            minimum effective quench is .035
             
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            • pittsburghracer

              pittsburghracer Well-Known Member

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              Nothing makes my heart warmer than beating by the book guys at the track. Lol
               
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              • fishmens67

                fishmens67 Well-Known Member

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                I take it you race a lot of brand X guys. lol
                 
              • j par

                j par Well-hung Member

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                Would you go less than .030?
                 
              • oldkimmer

                oldkimmer FABO Gold Member FABO Gold Member

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                A couple of time fresh heads. A couple of times just used heads. Kim
                 
              • pittsburghracer

                pittsburghracer Well-Known Member

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                Ya and a lot of slow azz Mopar guys. I’m not particular. Lol.
                 
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                • oldkimmer

                  oldkimmer FABO Gold Member FABO Gold Member

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                  Back then nobody cared either way or even new about quench . Just used the regular replacement Fel pro gaskets.
                   
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                  • fishmens67

                    fishmens67 Well-Known Member

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                    low as .025, was never a problem. but THEY say you shouldn't. lol
                     
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                    • j par

                      j par Well-hung Member

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                      I know when my engine was originally built it was.010 above deck. of course when I read the paperwork that's how much they shaved off the top of the block to get it square.. so as it was discussed with me the engine builder instead of using a fatter gasket then the 1008 at 39 he gasket matched countersunk the heads around the edges so many thousands to accommodate... He seemed to be comfortable at a minimum of .030?
                      So now I'm faced with this..
                      20150202_121735.jpg
                      Versus this...
                      IMG_20190930_113659.jpg
                      (" IF ") that is actually .010 above which I have not personally measured and that is a 5 year old picture when the block was being built, then a 1008 should leave me .029? And a 8553 should leave me .043?..
                      Edit: I would also appreciate @70aarcudas take on this post??..
                       
                    • pittsburghracer

                      pittsburghracer Well-Known Member

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                      84BB1772-63E3-4216-A864-4F77C62A687F.jpeg Off topic some but I found this on Facebook. A member wanting to lower his compression some went about it the right way for a win win. Lower compression and a better flowing ProMax Head.
                       
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                      • lead69

                        lead69 hopeless car junkie

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                        Everything I have seen/experienced is quench is really only important for detonation control on a street driven engine with octane limitations (pump gas). The main thing is you are better off to be quite a way out of the danger zone than flirting with it. In other words if you are not .030-.050 than set it up with .080 or more and avoid the range in between as it is more prone to detonation by being in the "close but not there" area.

                        All this applies to a hot pump gas engine, if you ask around at the track you will see most guys are only concerned about the end result of valve clearance/static ratio ect. and not the other way around,they let the quench fall where it is. Of course there are alot of variables and different approaches but I can say from all the engines I have seen on the dyno (a shop YR worked at did back to back tests a couple times on quench) there is no discernable power difference in any of them.
                         
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                        • j par

                          j par Well-hung Member

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                          Me personally I wouldn't be disappointed if I didn't get any power gains. I was mostly looking to get the aluminum heads that I've always wanted and lose 50 lb...
                          I was just wondering if anybody did see a changeI...
                          It looks like if I use the 8553 I should be safe with a little room to spare but still in the good Zone...
                           
                        • j par

                          j par Well-hung Member

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                          What is the port on the right looks so much bigger than one on the left?..
                           
                        • oldkimmer

                          oldkimmer FABO Gold Member FABO Gold Member

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                          It looks like they opened up the combustion chamber to lower the compression some. Kim
                           
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