MORE SPECIFIC DETAIL, ON HOW TO BUILD
WATER INJECTOR OR WATER/ALCOHOL INJECTOR for NA engines
PARTS REQUIRED, 12” Length (1/8” Copper Tube 3/16” OD, or Brass Tube, same spec.) from Brake Repairer, or Hobby shop for Brass, $6.45. Must be 3/16” OD. ... For PVC Tube, Ebay autopoweronline $7.46 for 1 Metre from UK, Food Grade PVC, has a heavy wall thickness, is Very Transparent, and a temperature Range of -15C to +60C. ... This Product I recommend.!!
FLUID SUPPLY BOTTLE, I have used a 2litre milk bottle, for fluid supply, ... Optimum Position for the Fluid Supply Bottle (FSB) is as close as possible to the Carburetor, SECURELY MOUNTED to the Car Body, Next to the Windscreen Washer Bottle is my Best Choice.!! ... The Maximum Fill Level is indicated by the black Dotted line, Use a permanent marker to indicate Maximum fill level, on your bottle.!! The Max. Fill line MUST be located 30 to 50mm Below the Venturi level, The Closer the (FSB) Is to the Carby the more efficient it becomes.!! The PVC tube to the Carburetor does not need to be Guitar string tight, but should not sag below the bottom of the (FSB).!! The Shaped Copper piece, it’s purpose is to have our Pickup lying flat at the base of the (FSB) the copper piece’s Weight keeps the tube at the lowest point in (FSB) After the Metering Tube is made, allow sufficient PVC tube have Pickup lay flat.
With a file create an angled point, to stop the pickup sucking onto the side of the (FSB)
The CAP, needs 2 holes drilled one to be a tight fit to hold the Copper Metering Tube, The other is a Breather Hole to stop the bottle from collapsing as the vacuum created from drawing off Fluid, ... A 1 to 2mm hole has been suitable.
The METERING TUBE (1/8” Copper) (Or brass) OD of 3/16” (4.75mm) With a Total Length 4+5/16” (110mm) MARKUP your TUBE Starting at end, Mark 20mm from end then + 10mm, 7 times, +20mm, = 110mm. Cut 6 pieces of PVC tube 7mm in length, the PVC tube MUST be a TIGHT FIT when pushed onto the copper/brass tube.!! The PVC Product from the UK, ... I Recommend. ... Drill the 1st Metering Hole, (MH1) 40mm from end, then 5 more, 10mm apart, as your Markup.!!
METERING, (Our fine tuning device) Start with 5 metering holes COVERED at the choke’s Set, fast idle speed of 1300/1500 RPM, approximately. Watch PVC tube to carby to see if fluid flows, (Fluid may be Dyed with a Drop or two of food dye, making it more visible for this testing, only.) If a Flow has started, And the engine does NOT run smoothly, Stop engine and uncover 1 more metering hole, (REPEAT This adjustment if needed) When fluid appears to flow at the fast idle speed, and engine is running smoothly, Observe flow decreasing as Temp. increases and fast idle speed slows to Set idle speed, of ?650 RPM, At idle speed there should be NO Flow. ... As the RPM increases when driving, Fluid injected will Also Increase proportionally to the fuel demand to 5000 RPM + ... It then Requires No Further Adjustment.!! At this point you may choose to fix the PVC Adjusters to the copper/brass tube on 2 edges with a little Contact glue.!!
CARBURETOR INJECTOR TUBE, On a single throat downdraft Ford carby, for example, the Optimum position for Injection is 68mm from the top edge of the Carby, (as used on 1600 Engines) On a section of Copper/Brass Tube, approx. length 45mm, File or Grind on a fine grinding wheel, the end of a piece of Copper/Brass pipe to look similar in end shape, or angle to the Drawing. ... This includes sufficient length to attach the PVC TUBE to the (FSB) Fluid Supply Bottle. Test Drill a piece of scrap, (plastic or aluminium) with a 5/32” or 4mm drill, on an angle as needed when drilling the Carburetor, then Carefully enlarge the hole with a 4mm round Needle File to achieve a Tight or Press Fit, when tapped into the test hole using a small hammer. You may try tapping the drill hole with a 4 or 4.5mm Tap, (Depending on the thread type of the tap.) then trying the tube. Be satisfied with your testing Before drilling your Carburetor. (This is the only hard bit) ... To Guarantee this connection is Leak Free, apply some Silicon Sealer, or Epoxy Resin around the Tube where it passes through the Carb Body.!! ... For Additional Safety, where the PVC tube from the FSB Joins the Carburetor Injection Tube, Squeeze the end of that Tube Slightly to make it Oval, Before attaching PVC tube from the FSB.!! ... WEBER 2 Barrel, Use the Primary Barrel.
Cheers, Geoff
NO Instructions at this time for Fabrication of the CARBURETOR INJECTOR TUBE, that is NOT drilled through, and securely supported by the Carburetor, The possibility exists where the Throttle Butterfly May be held in an open position unexpectedly when driving the vehicle.!! (This Requires more investigation)
post edited by GeeBeeN - 2014/11/28 10:14:22