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    Thread: FAQ - Carbs

    1. Member Big CADDY's Avatar
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      05-02-2009 11:02 PM #201
      there is a plate you can mount to the base of them to block direct heat, but i think it's a home made thing.
      got any pics of the setup in the notch?

    2. 05-03-2009 01:27 AM #202
      Header wrap makes a huge difference. Here are the plates Tom mentioned:


    3. Member zcxerxes's Avatar
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      05-03-2009 08:14 AM #203
      Quote, originally posted by Big CADDY »
      there is a plate you can mount to the base of them to block direct heat, but i think it's a home made thing.
      got any pics of the setup in the notch?


      yes i know there's ins't an upper rad hose this picture was from when i was getting all the brackets made for everything.
      i've already got those plates and the header is all wrapped up tight. any other options?
      it's a mk4 2.0 manifold that i ground the piss out of to mate with the counterflow head then hacked up the downpipe to make parts for the rest of the exhaust.



      Modified by zcxerxes at 5:38 PM 5-3-2009
      sometimes you have to do $hit
      aircooled abomination

    4. 05-03-2009 10:40 AM #204
      that's a tough setup for airflow, very cool though!! I'd look to block off the whole area under the carbs somehow and/or another small electric fan on that side to promote air movement. An airbox for the carbs might help avoid other problems with IATs.

    5. Member zcxerxes's Avatar
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      05-07-2009 07:22 PM #205
      Quote, originally posted by Mk2enthusiast »
      that's a tough setup for airflow, very cool though!!

      thanks. there were a few issues that needed worked through to get it this far and i'm sure there are a few more in my future before i can drive it readily. i didn't think that the heat would be this big of an issue with the carbs as other people run these on counterflow heads and i didn't find that many issues with them when i searched. i've got a couple sheets of phelonic at work and am contemplating making a heat sheild out of that but the header might actually get hot enough to burn that. so i guess there's only one way to find out. can you wrap more than one layer of header wrap without any issues?
      sometimes you have to do $hit
      aircooled abomination

    6. Member Big CADDY's Avatar
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      05-07-2009 08:06 PM #206
      perfect fix: swap it out for a 16v

    7. Member Shawn M.'s Avatar
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      05-08-2009 08:06 PM #207
      im so glad i found this thread, thank you too all who have added. Im in the process of swapping in a holley 2 barrel and modded oem carb intake onto my 84cabriolet project. i need to go back and read before I ask questions but this is so exciting!

    8. Member zcxerxes's Avatar
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      05-09-2009 10:58 AM #208
      Quote, originally posted by Big CADDY »
      perfect fix: swap it out for a 16v

      the only thing i'd swap it out for right now would be an aba head and a draw through turbo. i've already got a carb prepped for that and a head to swap in just wannt try to get this working first.
      sometimes you have to do $hit
      aircooled abomination

    9. Member Y00D00DZ's Avatar
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      05-11-2009 05:43 PM #209
      ok so i have a few questions about the fuel pump.
      1. what do you do with the old fuel pump thats in the gas tank?
      2. is the new fuel pump such as the Carter electronic?
      3. could you get away with running the stock in tank fuel pump and run the fuel through a fuel like this...
      http://www.thehotrodcompany.co...=1290
      #3 might be a dumb question but its really something thats been on my mind.
      also in the diagram that is posted for the MSD ignition, is there anything that hooks to the distributor? as far as wires go?




      Modified by Y00D00DZ at 2:54 PM 5-11-2009

    10. Member Big CADDY's Avatar
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      05-11-2009 10:15 PM #210
      Some have used the intank pump for the carbs. worth a shot.
      the carter pump is 12v
      In the diagram the wires 5,6,3 go to the Hal sender on the distributor.

    11. Member Y00D00DZ's Avatar
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      05-12-2009 12:27 AM #211
      think that fuel block will work if i test how much psi the stock pump is putting out before and after the block. its kind of old fashion but who knows haha
      also ignition control box is that after market or is that stock like in the car already


      Modified by Y00D00DZ at 9:29 PM 5-11-2009

    12. Member Big CADDY's Avatar
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      05-13-2009 11:06 AM #212
      the ICM is factory. 6 wire type.

    13. Member notajetta's Avatar
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      05-14-2009 02:37 AM #213
      Quote, originally posted by Big CADDY »

      so i'm just getting ready to wire my ignition. i looked at my icm and it only has 4 wires coming out (pins 1,2,4, and 6) and their colors correspond with yours. the rubber boot to seal the connection only has 4 holes, so obviously it was not made with 6 wires. can i just add the missing connections?
      next question: i'm not running an msd setup (yet), so then pin 1 should go the + on the coil?
      thanks!
      the little coupe that could...

      fondly remembered: 1980 diesel rabbit, 1985 faux-harlequin, 1990 jetta, 2000 v6 passat wagon, 2003 1.8t passat sedan

    14. Member Big CADDY's Avatar
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      05-14-2009 08:25 AM #214
      I have nerver used the 4 wire type. Was just easier to get the one with the HAL wires attached (for me)

    15. Member 2lowcoupedoor's Avatar
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      05-30-2009 12:25 AM #215
      Quote, originally posted by notajetta »
      so i'm just getting ready to wire my ignition. i looked at my icm and it only has 4 wires coming out (pins 1,2,4, and 6) and their colors correspond with yours. the rubber boot to seal the connection only has 4 holes, so obviously it was not made with 6 wires. can i just add the missing connections?
      next question: i'm not running an msd setup (yet), so then pin 1 should go the + on the coil?
      thanks!

      For the first question, yes you can just add 2 wires to your exhisting plug to make it a 6 wire plug...that is What I had to do too. here is a picture of how I did mine. There is a factory plug that has 6 wires though.

    16. Member Big CADDY's Avatar
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      05-30-2009 12:32 AM #216
      Notice:
      Version 3.0 of the diagram is out.
      Removed the part about getting 12volts from the + side of the coil..
      creates a short.
      sorry




      Modified by Big CADDY at 11:18 AM 6-3-2009

    17. Member notajetta's Avatar
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      06-14-2009 08:04 PM #217
      a week from tomorrow i expect to do the grand-'ol "check everything over and see if the darn thing starts".
      in the interests of time and budget i went with the simplest ignition possible - just the ICM hooked up to the HAL sender and the coil. so without any kind of ignition curve or timing advance:
      what is a reasonable static advance, and what kind of performance (or lack of) and behavior should i expect? i ask so that i won't be dissapointed, and so that i know what behavior is normal/abnormal.
      backround info: this is a 16v with dual weber 45's and some sport cams from autotech.
      aaaannndddd one last question. it was asked of me, and i think i know the answer... but it made me think. so: do you ever use the knock-sensor setup from the 16v with carbs?
      the little coupe that could...

      fondly remembered: 1980 diesel rabbit, 1985 faux-harlequin, 1990 jetta, 2000 v6 passat wagon, 2003 1.8t passat sedan

    18. 06-15-2009 01:46 AM #218
      this will not give your ignition any kind of advance curve, your car will run like doo-doo.
      you need something to advance the timing i.e. MSD 8980, vacuum/centrifugal advance distributer

    19. Member notajetta's Avatar
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      06-15-2009 02:36 AM #219
      yup. i know that. but it will obviously start and run. what i'm asking is for more detail than "doo-doo". i assume it will behave normally below 3k rpm, with a power drop-off after that? how much of a drop? is there an advance that will be a bit of a compromise?
      the little coupe that could...

      fondly remembered: 1980 diesel rabbit, 1985 faux-harlequin, 1990 jetta, 2000 v6 passat wagon, 2003 1.8t passat sedan

    20. Member Big CADDY's Avatar
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      06-15-2009 09:12 AM #220
      I keep that exact setup in my glove box as a backup ignition in the case any of my MSD stuff fails.
      It will start and run, but the benifits of timing advance won't be there. you could probably get away with a 12* advance. Most of the problem wiht a static advance is getting the car started.. If you have a strong starter/battery you may be ok.
      Just try to avoid lugging the engine to avoid any type of ping.
      I have a used MSD 6A box if you plan to go that route... I'm gonna put it on Ebay. but I figured I'd offer it here.

    21. Member notajetta's Avatar
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      06-15-2009 08:29 PM #221
      well, i bit the bullet this morning and in the interest of time (and the great wiring diagram you made) i ordered an msd 6al and an 8980. i'm not thrilled about the cost, but i know it will work... and in two weeks it has to make a 6 hour trek to minneapolis so i'll take all the reliability i can get. thanks for the help and advice! [IMG]http://**********************/smile/emthup.gif[/IMG] [IMG]http://**********************/smile/emthup.gif[/IMG]
      the little coupe that could...

      fondly remembered: 1980 diesel rabbit, 1985 faux-harlequin, 1990 jetta, 2000 v6 passat wagon, 2003 1.8t passat sedan

    22. Member Big CADDY's Avatar
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      06-15-2009 09:32 PM #222
      I'm hoping to make that same trip to eurowerks....... but in an airplane.

    23. Member notajetta's Avatar
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      06-16-2009 01:38 AM #223
      cheater.
      well, make sure to stop by and say hi!
      the little coupe that could...

      fondly remembered: 1980 diesel rabbit, 1985 faux-harlequin, 1990 jetta, 2000 v6 passat wagon, 2003 1.8t passat sedan

    24. Member notajetta's Avatar
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      1981 jetta coupe 16v, 2009 Audi A5 3.2L manual Quattro
      06-24-2009 12:15 PM #224
      pre-question explanation: the coupe's first startup has been delayed, which is probably a good thing considering all the problems we could potentially run into before or during a 6 hour drive to MN.
      a somewhat newbie question: i bought and installed the msd-6al and the msd 8980. per the 8980's manual: when the engine is at idle (sub-1k rpm), the 8980 will retard the timing 20 deg, and once it's over 3k rpm, the mechanical advance will be all-in (the 8980 will no longer be retarding the timing).
      that differs a little from your ingition timing walkthrough... can you help my confusion?
      and that leads to my next question: since i'm running a 16v, which is an interference engine, how much advance can i run before i start bouncing valves off my pistons? and as i'm thinking about this, my cams will obviously affect this...
      here are the cams specs from autotech (if this helps):
      Intake 10.2mm x 252°
      Exhaust 10.9mm x 264°
      114° lobe center
      the little coupe that could...

      fondly remembered: 1980 diesel rabbit, 1985 faux-harlequin, 1990 jetta, 2000 v6 passat wagon, 2003 1.8t passat sedan

    25. Member Big CADDY's Avatar
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      06-24-2009 01:57 PM #225
      ok, we are talking igntion timing not cam timing or mechanical timing. valves will never hit.
      It is confusing how it works.. I agree.
      your ignition can't possibley be advanced. not possible electronically. so the 8980 box actually starts out retarded and removes the retard of the timing giving it the same effect as advancing up to 20*. so at idle (under 1kRPMs the timing is retarded 20* so this is where you add the extra 6* or 8* which at 3kRPMs the 20* will be added. ....... get it?
      This allows the car to be started and have a timing advance of 6* or 8*. like a normal VW does. then as it revs the retard is removed up to 3K where you'll be at 26* or 28* whichever..
      I think I confuse myself.
      From MSD
      When you start the car, the Timing Computer retards the timing 20° from the set mechanical timing. This provides smooth idle. The timing begins to advance when the engine speed reaches 1,000 rpm and continues until 3,000 rpm when the total timing is reached.




      Modified by Big CADDY at 2:11 PM 6-24-2009

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