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zc dohc+dual carb

Discussion in 'Engine Building' started by pekar, Dec 13, 2014.

  1. pekar

    pekar New Member

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    hi, i've got 89 ec8 civic, now i'm building zc dohc with dual carb and i'm not sure what shall i do with ignition. i've got a distributor from d13b with vacuum correction of advance but it doesn't fit zc engine.. dizzy from zc doesn't fit too because my carbs are non-pgm and have no ecu. the only decision i see is to overweld my dizzy so that it fits my engine.. any ideas?
     
  2. CAFROG

    CAFROG Honda Minion VIP

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    Maybe an older accord dizzy? One that was carb'diet already. It might fit. But I really don't know. I know it's possible. Guys were carb'ing late 80's early 90's B18A's. I saw one of each drag race for a few seasons. CYBER Racing was the crew. One of them kept carbs longer than the other. They were both white cars.
     
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  3. jlicrx

    jlicrx Senior Member

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    we had the same problem when we converted our ZC to carbs - we tried using the vacuum advance distributor from the 86-87 Integra D16A1 - it would run, but not like we thought it should - we finally spent a bunch of money on an MSD system which works perfectly
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  4. pekar

    pekar New Member

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    hey man that looks perfect! and what was the problem with integra dizzy, low amplitude of advance correction without ecu? the thing is i'm from russia and now with that exchange rate i just can't afford MSD or smth like that..(
     
    Last edited: Dec 14, 2014
  5. jlicrx

    jlicrx Senior Member

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    exactly - the D16A1 distributor has two vacuum advance mechanisms on it, along with a centrifugal advance - one mechanism is strictly vacuum but only advances the timing by 6 degrees - the second one is partly controlled by the ECU (which we don't use) through a solenoid that controls the vacuum to the mechanism based on readings from sensors on the engine, i.e. coolant temperature, RPM and load - this advances the timing by another 12 degrees - without the ECU, it just didn't work right - we could have probably figured it out eventually with a distributor machine, but after countless hours we got tired of messing with it and just spent the money on something we knew would work; and we were already using some of the MSD items like 6AL ignition - it is quite a bit of money to do it the way we did - it could have been done for less - we use between 34 to 40 degrees total advance on the ignition but we are running at altitude of 5000 to 6000 feet above sea level

    one thing that you are going to need is a quality, high volume, low pressure fuel pump - the carbs only need 3-5 psi pressure, but need a lot of volume - anything more than about 5 psi and they will let fuel by the needle valve causing flooding - we run ours at 3 psi with a Carter Rotary Vane 4 psi pump and a Holley fuel pressure regulator

    to use the D16A1 distributor, you also need to swap the #6 intake camshaft bearing cap with one from the 86-87 Integra - with that part you can get the top bolt on the distributor bolted up - the other two bolts still won't line up with the head but it seemed to work just fine with the one bolt - that part may be harder to get than the distributor - you can find these D16A1 distributors for around $50 U.S. on ebay.
     
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  6. pekar

    pekar New Member

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    thank you for detailed answer. i know about low pressure fuel pump, it's not a problem to find one here in moscow. can you tell me more about msd system, what does it contain, a dizzy and an electronic control unit? how does it work with carbs? (and may be i can make a DIY ignition system? i can work with soldering iron and i have made some ignition systems for mopeds)
     
  7. jlicrx

    jlicrx Senior Member

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    our system is kind of elaborate - we have the MSD 6AL ignition with the MSD 8979 Programmable Multi-function Ignition Controller and run the MSD Blaster 3 ignition coil - the 8979 ignition controller controls the ignition and is very versatile and allows us to program a timing curve by setting the advance at each 100 rpm (we could also have a different curve for each cylinder, if we desired) - it also has 3 different rev limiters and can set shift lights for different RPM in each gear: plus a lot more - the 8979 that we have has been discontinued - MSD now offers the Digital 7 ignition which incorporates both the 6AL and the 8979 into one unit - the 8979 fires the ignition through the coil - to trigger when it fires, we use an MSD crank trigger which we mounted on the oil pan rail on the front of the block and is aimed at the back of the flywheel - we installed two MSD flying magnets into the back side of the flywheel at 180 degrees apart, which in conjunction with the crank trigger tells the 8979 when to fire - since the 8979 controls everything, we removed everything from inside the stock distributor except for the shaft and rotor, which directs the spark to the spark plug wires - everything is programmed into the 8979 by use of a laptop computer
     
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  8. pekar

    pekar New Member

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    that sounds cool, but i just can't afford it. for example countin with today's exchange rate i've bought my civic for 300$ and zc engine+carbs were about 130$.. and msd system with delivery will be about 500-600$... my car is everyday hatch, not a drag racer, and i have not enough money. i think i will try to make a homemade ignition system.
     
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