 Show MSD Universal - Built-in 2 Step Rev-Limiter - Rotary Dials Part # 6421 Be the first to write a review 1 EmissionsThis part is legal for sale and use on Emissions Controlled Vehicles, in all 50 states, when used in accordance with the manufacturers application guide because it has a California Air Resources Board (CARB) Executive Order (EO) number. See Emissions Details MSD is excited to announce the next generation of 6-Series ignition controls - the 6AL-2! The ignition control combines a new housing, new digital controls, and more power in a sleek package. Inside the new cast aluminum housing, you'll find an advanced micro-controller that manages the built-in two-step rev-limiter. The spark output of the new box has been turned up to 535 volts of primary voltage with spark energy reaching up to 135 millijoules! The multiple sparks of the 6AL-2 burn in the cylinder for 20 degrees of crankshaft rotation to ensure complete combustion. Two more great features are the rev limits! There are two rev limiters; one for high-end overrev protection and another you can activate off a clutch or trans-brake to set a launch limit. This feature will help your car blast off the starting line! Adjustments are made via four rotary dials for 100 rpm increment control! The all-new capacitive discharge ignition will easily connect to nearly any 12-volt negative ground distributor system. Features:
About MSD From small block street cruisers to 10000 horsepower top fuel dragsters, MSD's ignition systems has been the industry leader for over 40 years. MSD continues to push the envelope with cutting-edge ignition technology as well as intake manifolds and EFI systems.
1 This part is legal for sale and use on Emissions Controlled Vehicles, in all 50 states, when used in accordance with the manufacturers application guide because it has a California Air Resources Board (CARB) Executive Order (EO) number. The following vehicles are considered Emissions Controlled Vehicles:
Reviews Your ReviewTitle Review Photos *Free Shipping & Handling only offered to the contiguous US on orders over $100, excludes clearance parts and oversized packages. Some parts are not legal for use in California or other states with similar regulations. I just wired up my new Crane ignition HI-6DSR with the built in 2 step, and I used the instructions above for wiring the relay and it works great. Thank you. I also wanted to add, you can get the correct relay at advance auto parts, but you have to ask for a BWD relay part number R3177. This is a 5 pin normally closed relay, when you look at the diagram on the correct relay needed you will see it shows 87a connected to 30, then when it switches it connects 87 to 30. The universal 5 pin relay they sell in the isle will not work, it has two 87 pins and not a 87a pin, and it's normally open, meaning the two 87's will get connected to 30 when the switch is activated with power and ground from 85 and 86, and none are connected until the switch is activated. I removed the IC pipe to the elbow, UIM, oil fill tube, then the little wire harness that has the coil connectors and cut the red/black wire a couple inches away from the main harness
connector where it is still just one wire before it splits off to supply power to the coils at the top terminal of the trailing coil plugs. the trailing coil + wire from the ignitor/harness side goes to 30 and 86. I wired mine up with clutch switch, there really is no reason to wire it up to the horn switch unless you really want to have an extra button to worry about when you are launching at the drag strip. With the clutch pedal pushed it just a little bit, just past where the clutch switch is fully extended, the trailing coils turn off and 2 step is activated and ready to go when you rev and hit the desired rpm set for the 2 step. This crane is really nice, it has two rotary dials for the 2 step and two for the maximum rev limiter, so each rev limiter is adjustable in 100 rpms increments. Either it's just me and I didn't realize it before with my Jacobs FC1000, but man this thing revs extremely smooth and quick. Idles good too. Another thing you can do to disable the 2 step relay, so the trailing coils always stay on like normal and the clutch does not activate the 2 step, just simply put a switch on your wire that goes from the clutch switch wire to pin 85 on the relay. This way the relay won't work, and nothing different will happen when using the clutch, trailing coils will stay on and 2 step won't activate. Otherwise your engine will always have a lower rev limiter when you rev the engine with the clutch in, to what ever you have the 2 step stage rev limiter set to. I figured this was no problem so I did not choose to add the extra switch. Does MSD 6AL have 2 step?MSD 6421 6AL-2 Ignition Control with 2-Step Rev Limiter.
What is the white wire on MSD 6AL?This is the ONLY wire that makes electrical contact with the negative coil terminal. There are two circuits that can be used to trigger the MSD Ignition; a Points circuit (the White wire) and a Magnetic Pickup circuit (the Green and Violet wires). Only one circuit will be used at a time.
Which wire is positive on a MSD distributor?The magnetic pickup wires of an MSD Ignition Control are twisted together and routed in a separate sleeve with a 2-pin connector. The Violet wire is positive and the Green wire is negative. This harness connects to the distributor pickup or a crank trigger pickup.
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Msd 6al 2 step wiring diagram
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