CIS westy puullls.

The quintessential people and stuff mover.
MASSIVE TYPE IV
Posts: 20132
Joined: Fri Jul 07, 2000 12:01 am

CIS westy puullls.

Post by MASSIVE TYPE IV »

I made my own sump so I can run dual pumps later for my Turbo arrangement in the Bus.

I also used the Ford inertia switch.

removing the small screens in the fuel distributor where the lines attach gave me 3 HP on the dyno, FYI
Pillow
Posts: 2940
Joined: Mon Oct 15, 2001 1:01 am

CIS westy puullls.

Post by Pillow »

Jake is the best example of testing the CIS on a T4 so take his word as gold on this subject Image

Personally I think there does not need to be a fuel accumulator in a bus because the tank is right there next to the engine. My plan is to tap into the stock tank and connect stuff with AN fittings for the lines. Just be sure to mount the fuel pump below the tanks and you are in business.

I agree that Gary Miller is the man to call for the special bits and pieces for the conversion. Maybe a good local place could do the lines but I would just go Miller anyway. Granted you should only need the long lines to #1 and #2 as in a split T1 engine setup regular Audi lines can reach # and #4.



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Adrian Pillow
'66 VW Westfalia - "Biscuit"
'79 Porsche 911 SC - "Cochese"
B.Reiff

CIS westy puullls.

Post by B.Reiff »

A sump and an accumulator are technically two different things. Sumps exist for the injection system to draw from and return an air free stream of gas. the accumulator keeps pressure on the system to1. raise the boiling point of the fuel 2.keep liquid gas at the injectors(especially after a hot soak)

If I'm not mistaken the gentleman w/ the 914 was or is having hot start problems because of the lack of an accumulator and the phenolic spacers under his intake manifold.

Jake- you said your using an inertia switch also-is that new or have you been using that for some time?
germansupplyscott
Posts: 887
Joined: Fri Jul 20, 2001 12:01 am

CIS westy puullls.

Post by germansupplyscott »

gents,

just out of curiosity, why do you need the sump? if the volvo system works well without it, which it does, why is it required? i have never worked on a volvo turbo with CIS, but i have owned a few NA CIS volvos, and none of them had a sump of any kind.

another question, i see CIS components that look like control pressure regulators also called a "warm-up valve". is it two ways to name the same thing?

scott lyons
MASSIVE TYPE IV
Posts: 20132
Joined: Fri Jul 07, 2000 12:01 am

CIS westy puullls.

Post by MASSIVE TYPE IV »

My fuel tank was not FI compatible and *could not* be changed because of some modifications i made to the bus. I had to run the sump anyway for the Turbo upgrade for larger diameter outlets to the dual CIS pumps. My sump is fed by a third electric pump, that keeps the sump filled constantly. All 3 of them are inertia switch protected.

My CIS injected bus just logged 18K miles in less than one year, I still have not changed the oil since it left the dyno, and have *not touched* the CIS system.(literally)

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Jake Raby
Raby's Aircooled Technology
www.aircooledtechnology.com
germansupplyscott
Posts: 887
Joined: Fri Jul 20, 2001 12:01 am

CIS westy puullls.

Post by germansupplyscott »

jake,

that's awesome. i've had CIS vehicles before and they were excellent in pretty much every way. hey, if it is good enough for a 911, it is good enough for my bus...

i have been looking in some books, but i can't remember if CIS is supposed to have a fuel return line to the tank. i am getting form what you say that if you have a return (and a stock-ish motor) you can do without the sump?

scott lyons
Pillow
Posts: 2940
Joined: Mon Oct 15, 2001 1:01 am

CIS westy puullls.

Post by Pillow »

My bad, I was talking about a sump and not the accumulator in the previous post. The accumulator is necessary to reduce the pulses from the fuel pump, and maintain system pressure for hot starts.

>i see CIS components that look like control pressure regulators also called a "warm-up valve". is it two ways to name the same thing?<

Same thing. Just different terms. I have yet to figure out where exactly to mount this gem Image Part of me says it is not necessary (like a choke on a carb) and better fuel mileage could be had w/o it. There is a warm up valve to handle a higher idle when cold.

As for the tank routing. I plan to have the outlet to the pump and then on the top a return line. Some say a "T" return line is fine and basically creates a closed loop system. But that adds heat to the fuel, which is bad in my opinion. I would rather cycle the fuel and keep it a little cooler.

The beauty of CIS is it is very adaptable and simple.




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Adrian Pillow
'66 VW Westfalia
'79 Porsche 911 SC - FS
VolkSport Kafer Gruppe
B.Reiff

CIS westy puullls.

Post by B.Reiff »

A few years ago I worked at a european auto repair shop. Some Cis problems I saw on a regular basis were cracked intake boots, sludged up cold air bypass units and sludged up idle stabilizers(CIS-E). Cold PA winters took there toll on systems that had misadjusted warm up regulators-fuel pressure can be indirectly varied by lightly tapping the plug on the front of the regulator(spring seat)this repair is better left to trained personnel.The only time I saw(actually heard) a fuel distributor go bad was when one of my co-workers started his Rabbit pickup and the throttle pegged.Internal wear was the cause but man, from 0 to6000 rpm on a cold motor really got my attention!

I don't know if this is common knowledge but here it goes-we used GM techron to clean and test CIS injectors-works great.Every fall a big bottle of Techron was dumped in tanks of service customers along w/their scheduled maint.My old GTI had over 250,000 miles on it when I resealed the injectors-hooking the inj. up to the inj. tester revealed an acceptable fuel spray pattern, all thanks to Techron.
MASSIVE TYPE IV
Posts: 20132
Joined: Fri Jul 07, 2000 12:01 am

CIS westy puullls.

Post by MASSIVE TYPE IV »

I included the return in my fuel sump. Basically my sump is designed so if I'm on the side of the road,with a broken FI system I can rip the old progressive from under the back seat, pop it on, run the hose from the Facte pump directly to the carb and drive on..

even though CIS is pretty much bulletproof, I still don't like having to be at the mercy of anything other than a carburetor...

Always be prepared.
Pillow
Posts: 2940
Joined: Mon Oct 15, 2001 1:01 am

CIS westy puullls.

Post by Pillow »

>we used GM techron to clean and test CIS injectors-works great<

I thought the Techron was made by Chevron? Anyway that is what I get, Techron from Chevron avaiable at most automotive stores. It is killer stuff!.. My CIS injectors are taking a Techron bath as we speak Image



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Adrian Pillow
'66 VW Westfalia
'79 Porsche 911 SC - FS
VolkSport Kafer Gruppe
B.Reiff

CIS westy puullls.

Post by B.Reiff »

Your right, Chevron not GM.Just don't drink it! B.reiff
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