8 Stack Injection Setup Pics

Julian · 09-03-07, 12:57 AM

Just thought I'd share a few pics of the DC&O injection setup that arrived today. Very plesant distraction from work it was! Just gotta build a motor to do justice to it now...oh, and get car registered, and...etc.

Big-Foot · 09-03-07, 09:39 AM

Those stacks are just gorgeous....

Maybe someday I can find it in the budget but for now I'll have to have my stacks grouped 4 at a time in my dual quad setup..

Canuk40 · 09-04-07, 12:22 AM

Hey Julian,

They work as good as they look too! We've done a couple of these setups on Ford Racing 347s. The 8 Stack system gives good low end torque and a smooth transition to higher RPMs and the attendant unholy wail of an exhaust note! You're going to love it.

Cheers

Ricky · 09-04-07, 12:32 AM

Hey Julian,

Looks cool. Speaking from experience, be careful when bolting the manifold down. If not bolted evenly, the manifold can warp a tiny bit and the shafts tend to bind up slightly.

I have seen this happen on 2 DCO manifolds.

Hope you get licensed soon.

Julian · 09-04-07, 01:09 AM

Thanks for the tip Ricky. I'll try and remember that and keep checking for smooth throttle action when bolting up.

Will be a few months before the 'offroad use' motor is going though. Got the major components on order, hopefully here by end of month.

Had a couple of engineering (ADR) issues to work through, but have sorted them out. Just awaiting final approval for registration inpection presently.

Peter D · 09-04-07, 08:07 AM

Wow Julian - looks very nice. It is also quite different from my older DC&O setup (see pics of a standard RF arrangement & my stripped down one below).

Apart from the T/B differences, I am wondering where the vacuum take-offs are (the old setup had a large vacuum plenum under the centre of the manifold, with 2 take-offs on the top towards the back). In the pic of my setup, one take-off goes to the braided hose at the top of the pic, & the other goes to the adjacent rubber hose. We started off with just the braided hose feeding everything, but had trouble with the MAP readings in the ECU when the power brakes operated - so we added the rubber hose from the 2nd take-off, left the MAP on the braided hose & put everything else on the rubber hose - solved the problem.

Also, you might want to look into a pair of water bleed points at the back of the manifold - the old one had none, so we drilled & tapped them in - they save a whole bunch of trouble with overheating & bleeding. These outlets connect to the braided hose at the bottom of the pic of my setup, & it goes to a nipple on the thermo housing.

Another thing - check the shafts for grooves that locate the circlips which hold the bearings into the T/B's - my shafts had no grooves at all on the shafts & so the circlips moved out, followed by the bearings ! Collets & spacer tubes solved the problem.

BTW, we changed our setup so that the fuel rails run up the inside of the T/B's - this was done to get the injectors to fire almost straight down the throats, rather than around a sharp corner. My engine designer came up with the idea that this would help to get a cleaner burn, & hence have a better chance at getting thru the emissions tests. It was a real pain to make new fuel rails & fit everything in, but it worked - just scraped thru the old ADR-79.01 tests on the 5th try (the only 8-stack ever to do so) !

Kind Regards,

Peter D.

Julian · 09-04-07, 10:41 PM

Peter - Thanks for sharing your experiences.

Two vac ports are in the manifold valley at the rear. You can see them in a couple of the photos. I don't know if I'll use either of them as I don't have power brakes and I may not be using MAP sensing for the ecu due to the large cam I've got.

I did note there are no rear water bleed ports, so I may follow your lead and add them in similar to standard ford efi manifold I'm using presently.

I agree regarding re-positioning the injectors, but don't think I'll do that as it will be a race only motor, hence light load/low speed driveability, emissions and economy don't rate for my purposes!

Bill Hara · 09-05-07, 01:28 AM

Julian

I have the exact type of 8 stack from DC&O too, and I did drill and tap for the water bleed ports too. The thing I love about this manifold is the single adjuster per bank and the fact that it is very uncluttered compared to the earlier types as shown in Peter D's photos.
Congrats on your purchase and hope it finds a suitable home soon.

Bill.