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  1. #46
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    How much mechanical advance do stock distributors provide.? This could be a limiting factor to the solution as well?
    And yes everyone, apologies for my rants. Im better now.

  2. #47
    Do you ever leave? immortality's Avatar
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    Quote Originally Posted by GtoGeoff View Post
    bf,
    You are jumping around all over the place with timing. You need to do this in a methodical manner. You have low cranking compression. That can be caused by a long duration cam, worn engine, or cam installed in a retarded position. Whatever the cause is, low cranking compression is going to want more timing. You say you had it at 28* at idle. Adding vac adv with that much initial might be too much timing.
    IIRC the OP engine was originally built with a turbo so cam/compression are a mismatch for n/a application.

  3. #48
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    Cast,

    Yes, the mech [ centri ] curve will need to be set if a different dizzy is used. But this is done last, not first, after initial timing has been decided upon. That is why I didn't mention it.

    Plan is get bfhoon's engine idling as smoothly, efficiently & cleanly as possible...& go from there.

  4. #49
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    Quote Originally Posted by GtoGeoff View Post
    bf,
    You are jumping around all over the place with timing. You need to do this in a methodical manner. You have low cranking compression. That can be caused by a long duration cam, worn engine, or cam installed in a retarded position. Whatever the cause is, low cranking compression is going to want more timing. You say you had it at 28* at idle. Adding vac adv with that much initial might be too much timing.

    As far as I am aware, the std Bosch dist does NOT have an adj vac adv unit; having an adj vac adv unit is IMPERATIVE. Cannot stress this enough!!! Best thing to do is to replace the Bosch dist with a HEI. ProComp make a HEI for the 253-308. Road Star in Sydney, ph 9477 7666 also have them, $59, will post to you. I have used many of them & they come with the adjustable vac adv unit. This is what you need.

    Your wiring instructions with the Crane box will show you how to connect the HEI. Once you have an adj vac adv unit, you can start the real tuning. Soon, I am going to post a procedure for dialing in MVA [ Man connected Vac Adv ].

    Another MVA success story [ Australian author of at least two books ]:

    " However, at idle there isn't any vacuum with ported connections, but with manifold vacuum there is 18" of Hg because of the mild Phase 1 cam. This will provide an additional 16* of advance to smooth out the idle & allow a leaner mixture. In normal hwy driving this won't contribute much to economy but around town...economy could improve by 10% with manifold vacuum connected. With one of my cars this simple modification lifted city economy with the air on to within 6% of what was being achieved on the highway."

    Smart bloke.

    The thing to note here is that this was a very mild engine [ 18" of vac ] but MVA still provided a benefit.
    Thanks mate you are a legend I will buy one of those distributors for $59 bucks As its set up at the moment its the best I have ever had it in regards to spark plug cleanliness im not sure if im running to lean though. Motor was built for turbo which has now been removed the vacuum advance was never connected. At the moment the driveability is a bit rougher but still manageable on the street. Appreciate all your help

  5. #50
    Senior Member TonnerGuy's Avatar
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    Quote Originally Posted by immortality View Post
    IIRC the OP engine was originally built with a turbo so cam/compression are a mismatch for n/a application.
    Yes i thought that as well lower comp for more boost

  6. #51
    Do you ever leave? EH179's Avatar
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    Did anyone else notice the recommended HEI distributor supplier, in Poncho's post?

  7. #52
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    I would stay as far away from anything that has POCOMP'S name on it I don't care what item it is. Danger danger!!!!

  8. #53
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    Quote Originally Posted by beetle123 View Post
    I would stay as far away from anything that has POCOMP'S name on it I don't care what item it is. Danger danger!!!!

    I have heard procomp isnt the best but i mean how bad? Id be happy for testing purposes if I can get it running good and then long term I fork out for a msd or something else beter than anyone can recommend. At the moment im pretty stoked im finally not fouling spark plugs but im worried im running to lean.

  9. #54
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    Get yourself a genuine Holden Bosch HEI dizzy. You will buying something that works and that's a start mate. Your just pissing money down the drain when you buy that other brand. Geez just put the name in any search engine and you will see the heartbreak and horror stories using that stuff.

  10. #55
    Do you ever leave? EH179's Avatar
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    What can i say... listen to Poncho and be a sheep.


    Your next posted thread will be "How did this hole get in my block"...

  11. #56
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    Quote Originally Posted by beetle123 View Post
    Get yourself a genuine Holden Bosch HEI dizzy. You will buying something that works and that's a start mate. Your just pissing money down the drain when you buy that other brand. Geez just put the name in any search engine and you will see the heartbreak and horror stories using that stuff.
    I have a genuine holden bosch HEI dizzy!!!! With the big cap already can I add a vacuum canister to this easily for vacuum advance.... Yes I have heard the procomp horror stories pretty much the main reason why I have not gone down that path yet....

  12. #57
    Do you ever leave? EH179's Avatar
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    I have a Holden Bosch HEI dissy on mine and the vac setup is insitu, but disconnected, as i don't subscribe to Poncho's theory

  13. #58
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    I use the Ford cap and rotor. Yes you can add a can as there available in lots of different ranges. USE CAUTION with your can choice

  14. #59
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    bfhoon,

    I have used one Pro Comp HEI dist, never had a problem with it. I have used many [ well over a dozen ] & directed many people to buy the Road Star HEI dist, never had a problem. Probably all made in the same factory in China....

    Take no notice of EH179, he doesn't know what he is talking about.

    You can use the Bosch dist if you can find some way of adapting the Crane adj vac unit to it. They make a GM Points & HEI version, so two to choose from.

    I did some some testing of 4 pin modules, Bosch & GM HEI. The Bosch pulled slightly more current than the GM, about 5.5 amps v 5.3 amps from memory. More is better, but dwell is another important factor, which I didn't measure. The Bosch & GM module can be interchanged. Both use a small terminal for one of the pick up wires. The two p/up wires need to be reversed if swapping brands.

    Not wanting to sound like a broken record, but if you want to get the best idle quality & tip in response, the vac adv HAS to be adjustable.

  15. #60
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    Road star is AT Racing is Procomp Electronics...buyer beware.

    I don't know what i'm talking about? i will let the genuine members here decide that one... not some chest beating, look at me, i know everything, Johnny come lately

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