Making some kick ass pipes for 2nd gen commodore

[Anonymous View build HERE Member since: January 1, 1970 Posts: 0]

Mine is Pwr Steer, there’s room ;)

[pir4teParticipant Mallala640 HP hyper-cruising SS-V Flagonwagon View build HERE Member since: March 2, 2015 Posts: 154]

vs manta 218 wrote:

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.

[vs manta 218Participant Vs hsv manta View build HERE Member since: March 2, 2015 Posts: 796]

That’s to the start of the collector

 

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

[pir4teParticipant Mallala640 HP hyper-cruising SS-V Flagonwagon View build HERE Member since: March 2, 2015 Posts: 154]

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

Naturally as-pirated, all-motor.

[vs manta 218Participant Vs hsv manta View build HERE Member since: March 2, 2015 Posts: 796]

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

[pir4teParticipant Mallala640 HP hyper-cruising SS-V Flagonwagon View build HERE Member since: March 2, 2015 Posts: 154]

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.

[Anonymous View build HERE 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.

[vs manta 218Participant Vs hsv manta View build HERE Member since: March 2, 2015 Posts: 796]

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

[cava454Moderator 93 VR BT1 View build HERE Member since: February 20, 2015 Posts: 2 390]

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, 5 months ago by  cava454.

[vs manta 218Participant Vs hsv manta View build HERE Member since: March 2, 2015 Posts: 796]

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

[Anonymous View build HERE 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?

[vs manta 218Participant Vs hsv manta View build HERE Member since: March 2, 2015 Posts: 796]

Nar I haven’t at the moment

 

I just centred it up and welded them together

[Anonymous View build HERE Member since: January 1, 1970 Posts: 0]

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

[vs manta 218Participant Vs hsv manta View build HERE Member since: March 2, 2015 Posts: 796]

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

[Anonymous View build HERE 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.

[VRSenator065Participant Adelaide SAVR Senator LSx454 1960 Kombi (project) 1921 Nash Hot Rod (future project) View build HERE Member since: February 17, 2015 Posts: 5 777]

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?

 

[sands vsParticipant vs commodore View build HERE 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

[Anonymous View build HERE Member since: January 1, 1970 Posts: 0]

VRSenator065 wrote:

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..

[vs manta 218Participant Vs hsv manta View build HERE Member since: March 2, 2015 Posts: 796]

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

[Anonymous View build HERE Member since: January 1, 1970 Posts: 0]

So the Difillipo Venturi collectors?

 

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