running motor w/ no exhaust

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  • JPStrniste
    Advanced Member
    • Jul 2007
    • 146

    #1

    running motor w/ no exhaust

    Is this bad for the motor to run with no back pressure?

    I wanted to finish installing the cooling system on the car and want to get the car to running temp so I can bleed the system, but nervous about running with just open headers.

    anyone?

    - Jason
  • Mike B.
    E30 Modder
    • Jan 2006
    • 987

    #2
    Go ahead a run it.

    Comment

    • e30s52
      R3V Elite
      • Oct 2007
      • 5235

      #3
      just dont run it to long or you will warp the exhaust flanges

      www.gutenparts.com
      One stop shopping for NEW, USED and EURO PARTS!

      Comment

      • WillisE30
        E30 Modder
        • Jan 2007
        • 831

        #4
        Originally posted by e30s52
        just dont run it to long or you will warp the exhaust flanges
        That would take quite a while.
        sigpicFormer professional wrench thrower.
        Current:
        1988 325is S52
        Former:
        2008 Sparkling Graphite M3 Sedan(victim of home ownership)
        1988 M5
        1996 328is

        Comment

        • Teaguer
          R3V OG
          • Sep 2004
          • 6167

          #5
          Running with only headers or manifolds is perfectly fine .

          Running without the above and just an open head is where you run the risk of burning valves .

          E30 M3 / E30 325is / E34 525iT / E34 535i

          Comment

          • BigD
            E30 Enthusiast
            • Jul 2006
            • 1085

            #6
            Originally posted by Teaguer
            Running without the above and just an open head is where you run the risk of burning valves .
            How come? Don't most aircraft, esp the WWII V12s, basically run open head exhaust?

            Comment

            • Speedjunkiejp
              Member
              • Jan 2008
              • 69

              #7
              ummm they are built for that though.. thats like saying its ok to run 40psi on the motor too because dragsters do it..

              to OP... its fine to run it with open headers but might be annoying as it will be loud inside the cab as well.. but a quick run to the muffler shop is the same thing im gonna do.

              Comment

              • erik325i
                No R3VLimiter
                • Jan 2005
                • 3567

                #8
                I ran with no exhaust off an open head once and didn't have any problems. Of course, I only drove it about 5 miles to pick my brother up from school. It was loud as fuck!

                *edit* didn't realize this was in the 24v forum. I did it in my m20

                -Erik

                Comment

                • BDSax
                  Junkyard King
                  • Mar 2006
                  • 3593

                  #9
                  i drove my car with open header for about 100 miles till i finally got exhaust. its just really loud and anoying. get funny looks from people on the road
                  NEED SOME VINYL STICKERS???

                  Comment

                  • e30s52
                    R3V Elite
                    • Oct 2007
                    • 5235

                    #10
                    im i was saying if you do that for a long time it will. i dont know how far you plan to run like that. personaly i wouldnt do it just cuz the cops around here are a bunch of assholes

                    www.gutenparts.com
                    One stop shopping for NEW, USED and EURO PARTS!

                    Comment

                    • JPStrniste
                      Advanced Member
                      • Jul 2007
                      • 146

                      #11
                      I just wanted to be able to drive it on and off the trailer. I'm not going to go running down the street with it.


                      cops here suck.

                      Comment

                      • golde30
                        R3V OG
                        • Nov 2003
                        • 11464

                        #12
                        my plan is to run open headers for about 50miles to the exhaust shop i want to use. imma be sweating the cops the whole way there...
                        IG: @Baye30

                        FRONT VALENCE IS ZENDER!!! STOP FILLING MY PM BOX PPL!!!

                        Comment

                        • 1990m3
                          E30 Enthusiast
                          • Feb 2004
                          • 1180

                          #13
                          Originally posted by golde30
                          my plan is to run open headers for about 50miles to the exhaust shop i want to use. imma be sweating the cops the whole way there...
                          just call AAA if you have it. If you plan on shifting above 1500RPM it's going to be brutal. Bring earplugs, the headphone type that covers your whole ear. You'll need them!

                          Comment

                          • etxxz
                            R3VLimited
                            • Feb 2006
                            • 2085

                            #14
                            ^^ &
                            Originally posted by golde30
                            my plan is to run open headers for about 50miles to the exhaust shop i want to use. imma be sweating the cops the whole way there...
                            that's what i did ex i had to drivelike 28miles. it'll only be loud when you give it gas...1500rpm or 4000rpm lol you'll see. what are you exhaust plans?
                            No more e30s for me.
                            88 black BMW OBDII 332is dedicated track [sold]
                            88 BMW OBDII bronzit 332is [RIP 03/08]
                            91 BMW 325i [sold]
                            86 Corolla 'Ae86' HB 20v trd [sold]
                            http://youtube.com/watch?v=pTj7Hn9v5Rs

                            Comment

                            • ZiMMie
                              E30 Modder
                              • Jun 2004
                              • 968

                              #15
                              open headers ftw.


                              www.stancefactory.com

                              Comment

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