HomeForumsTechnical – GeneralExhaustMaking some kick ass pipes for 2nd gen commodore

This topic contains 147 replies, has 11 voices, and was last updated by Profile photo of VRSenator065 VRSenator065 9 years, 3 months ago.

Viewing 20 posts - 81 through 100 (of 149 total)
  • Author
    Posts
  • #7370
    Profile photo of
    Anonymous Member since: January 1, 1970
    Posts: 0

    Mine is Pwr Steer, there’s room ;)

    #7383
    Profile photo of pir4te
    pir4te
    Participant
    Member since: March 2, 2015
    Posts: 154
    Supporter

    And also the pipes are cyilendar 1, 3 and 7 are 42 inches long and cyilendar 5 is 40 inches close enough I suppose

    Is that total length including collector?

    What is the average length of primaries (before collector merge)?

    Naturally as-pirated, all-motor.

    #7384
    Profile photo of vs manta 218
    vs manta 218
    Participant
    Member since: March 2, 2015
    Posts: 796
    Supporter

    That’s to the start of the collector

     

    then after that the collector is something like 10 inches maybe a tad more

    #7385
    Profile photo of pir4te
    pir4te
    Participant
    Member since: March 2, 2015
    Posts: 154
    Supporter

    Where did you get the calculation for total length? 40″ seems way too long vs 23″ ideal.

    Naturally as-pirated, all-motor.

    #7386
    Profile photo of vs manta 218
    vs manta 218
    Participant
    Member since: March 2, 2015
    Posts: 796
    Supporter

    Thats just how long i had to make them to get to where i can fit the collector

     

    23 inches is above the steering rack

    #7389
    Profile photo of pir4te
    pir4te
    Participant
    Member since: March 2, 2015
    Posts: 154
    Supporter

    OK, I appreciate you’ve spent a lot of time making the long pipes for one side but one last thing, would this design fit?

    11″ Shorty Headers coupled with 31″ long 3.5″ OD secondary (collector)

    Naturally as-pirated, all-motor.

    #7394
    Profile photo of
    Anonymous Member since: January 1, 1970
    Posts: 0

    I used a calculator I found online, came up as 35″ but mine are a bit longer, I asked Darren Difillipo about it and he said it’s better to err on the long side.

    #7396
    Profile photo of vs manta 218
    vs manta 218
    Participant
    Member since: March 2, 2015
    Posts: 796
    Supporter

    The pipes above wont fit past my starter motor

    And no way in the world would i fit something like that on drivers side

     

    On passenger side all 4 pipes are above one another to get past starter motor and by there no.2 cyilender would be about 25 inches at a guess

     

    Its just so tight in a VS and has to be after the steering rack for the collector to fit in a 4 into 1 design and these size pipes doesnt help much

    #7398
    Profile photo of cava454
    cava454
    Moderator
    Member since: February 20, 2015
    Posts: 2 390
    Supporter

    Does it honestly really matter if they are longer here or shorter there? Not like your chasing every .01

    Seat of the pants it’s not gunna be any different.

    I can appreciate the work involved and considering this set isn’t very  costly $$$. But it is worth the time for the gain you will have?

    • This reply was modified 9 years, 7 months ago by Profile photo of cava454 cava454.
    #7400
    Profile photo of vs manta 218
    vs manta 218
    Participant
    Member since: March 2, 2015
    Posts: 796
    Supporter

    Exactly cava, It doesn’t bother me if they are little longer shorter straighter or more curved Or it doesnt exactly match what a computer program says

     

    but the info pirate put up on page 2 is absolutely awesome and thanks heaps as that did settle my decision on 1 7/8 for 8 inches and 2 inch rest of way as I was just taking a complete guess

     

    I have no idea what the gains will be or weather it’s worth it,  I’m betting  only a hand full will say it is and most will say fuck that your mad taking on that job and the rest will just be completely confused at what I’m doin and why

     

    if they made 1 7/8 pipes I would have just got them and been happy but in my oppion 1 3-4 is a little on the girls side even though people have made over 1000hp using them

     

    i just think this will make the power more efficiently and work better for the combo I have

    #7403
    Profile photo of
    Anonymous Member since: January 1, 1970
    Posts: 0

    I ran 1.3/4 on the big engine when it was in the Tonner and always felt that it held it back a bit, that’s why I bumped it up to 1.7/8 for the new build, got any pics of how you did the transitions?

    #7405
    Profile photo of vs manta 218
    vs manta 218
    Participant
    Member since: March 2, 2015
    Posts: 796
    Supporter

    Nar I haven’t at the moment

     

    I just centred it up and welded them together

    #7410
    Profile photo of
    Anonymous Member since: January 1, 1970
    Posts: 0

    Could be a benefit doing it that way, they’ll act as reversion dams.

    #7425
    Profile photo of vs manta 218
    vs manta 218
    Participant
    Member since: March 2, 2015
    Posts: 796
    Supporter

    I never heard of them, did a little reasherce a might help as I do have a big cam

     

    when you line the pipes up its so close and is only like a 1mm step around the pipe so I didn’t worrie about making any cones of any sort

     

    I have read that doin a step like I have and not a cone helps with scavenging but honestly it’s such a small amount that would change from this and with the power and torque I’m making I’ll never notice anyway

    #7426
    Profile photo of
    Anonymous Member since: January 1, 1970
    Posts: 0

    Reversion Dams do actually work, used to do it with my old Turbo I-6’s to good effect.

    #7429
    Profile photo of VRSenator065
    VRSenator065
    Participant
    • Adelaide SA
    • VR Senator LSx454 1960 Kombi (project) 1921 Nash Hot Rod (future project)

    • View build HERE
    Member since: February 17, 2015
    Posts: 5 777
    Supporter

    I’m with Cava. You are talking FI and a road car. Those calculations will work at a given rpm and a given load. How often will your car sit at that?

     

    #7435
    Profile photo of sands vs
    sands vs
    Participant
    Member since: March 1, 2015
    Posts: 619

    The pipes I put up pics of are for its355 done by mkal in croydon…. They do nice work but charge like insane

    #7439
    Profile photo of
    Anonymous Member since: January 1, 1970
    Posts: 0

    I’m with Cava. You are talking FI and a road car. Those calculations will work at a given rpm and a given load. How often will your car sit at that?

    Yep posted this on page #4, I doubt there’s a chassis dyno accurate enough to measure a difference..

    #7447
    Profile photo of vs manta 218
    vs manta 218
    Participant
    Member since: March 2, 2015
    Posts: 796
    Supporter

    Yeah the difference between little lengths and changes in 1st step length and stuff is all to fine a detail for me to be worried about, look at pacemaker pipes, cyilendar 1 is twice as long as cyilendar 7 to the first Y and that carnt be good

     

    iv got the tapered collector witch in my books was a must but the rest is just what it is

     

    looking at the pipes iv made and the pacemakers 5002 witch is the best pacemaker make for a VN-VS 5l is massive, you can easily see how much better myn will flow and I think that will make a measurable difference especially because I’m blower as well

     

    if if they mad 1 7/8 pipes for my car I would of just brought them in the first place and I would not be doin this now and also if I had to pay someone to do this there is no way in the world I would do that either

     

    because it’s cheap for me is the only reason I’m  Doin this other wise it would simply cost to much

     

    I carnt see some one making a set of these for any less then $3000

    #7448
    Profile photo of
    Anonymous Member since: January 1, 1970
    Posts: 0

    So the Difillipo Venturi collectors?

     

Viewing 20 posts - 81 through 100 (of 149 total)

You must be logged in to reply to this topic.