Lifter Angles and Hemi Blocks

Discussion in 'PSI Superchargers Tech Questions' started by Mike Canter, Jul 13, 2007.

  1. Mike Canter

    Mike Canter Top Dragster
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    With a hemi I understand that there are two different lifter angles depending on the location of the cam. I believe a raised cam has a 48* lifter angle and a standard location cam has a 45* lifter angle. If this is so, then what happens if you put a 45* cam into a 48* block and degree the cam onto #1 cylinder or put a 48* cam into a 45* block. Is this possible????
    If it is possible it would seem to be that one whole cylinder bank is going to be out of wack but other than not making a ton of power will there be any indications?
     
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    Mike Canter, Jul 13, 2007
  2. eli

    eli Banned

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    That is correct the other side will be off by up to 6 Degrees, back in the day we found that out the hard way when we put a 392 cam in a 354, 354 has a shorter deck hight and the cam is differant, basicly the same thing only differant. :rolleyes::D
     
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    eli, Jul 13, 2007
  3. Nathan Sitko - 625 TAD/TAFC

    Nathan Sitko - 625 TAD/TAFC TAD / TAFC

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    Mike,

    You can check this by degreeing in #1 as usual, then move your dial indicator to #6 and check the timing again. You will see the difference there if it's the wrong cam. If it is the correct can it may be off slightly, but shouldn't be too far off. I think when we degreed our cam in this year we were a little less than 1 degree off from #1 to #6.
     
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    Nathan Sitko - 625 TAD/TAFC, Jul 13, 2007
  4. Mike Canter

    Mike Canter Top Dragster
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    So what will be the indications if running the car. Is it possible that one side's plugs can all be lean and frosty and the other side show too rich?
     
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    Mike Canter, Jul 13, 2007
  5. eli

    eli Banned

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    Absolutely Mike, one side will be right, And the other side will be retarded. or you can have a air leak in your manifold, are you getting more alky in your oil than normal? :eek:
     
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    Last edited: Jul 13, 2007
    eli, Jul 13, 2007
  6. Mike Canter

    Mike Canter Top Dragster
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    I guess that is the other possibility is a an airleak on one side but it would have to be even on all the cylinders and that one side and let me ask here would the boost read low?It is reading about 32 PSI at 8000 rpm at 20% OD. A little worn but that is where i usually see them settle down to. This is not my motor but I am helping to trouble shoot it. Right now it seems to run OK and looked good on all the plugs when it was rich but as soon as he started to lean it out one bank of plugs stayed looking rich and the other bank went frosty cpmletely around the plug all 360*.
     
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    Mike Canter, Jul 13, 2007
  7. eli

    eli Banned

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    Mike the first thing to do is check the cam timing on #1 and # 6 ,Like Nathen said, as far as the boost goes we didn;t see a drop, but we were running a screw blower, and the boost probe was in the back of the manifold,and thats the first place you get boost with a screw. the big hint was the fuel in the oil. do you have the heads grounded back to the coil? do you have accses to a differant mag and box? is the mag fazed in ? just thinking as i'm typing of all the things it could be. how about the nozzels may be clogged.
     
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    eli, Jul 13, 2007
  8. Mike Canter

    Mike Canter Top Dragster
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    They are hopefully taking the fuel system apart now and checking for port nozzle blockage or having the port nozzles turned sideways. It would be pretty usual to have just all the nozzles blocked on one side but I have him checking that, ya never know. I will ask him about fuel in the oil and if no blockage and no fuel in the oil I am going to have them check the cam timing on 1 & 6. This was a used engine that they bought and started to run and you know the dangers of that. We are still recovering from our great used engine deal.

    The only real big clue is the difference in plugs appearance when it was leaned out a little.
     
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    Mike Canter, Jul 13, 2007
  9. OwnBlock

    OwnBlock Member

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    You may find that the valve to piston difference has altered on the opposing bank. If left as set on # 1 you would find opposing bank will be firing approx 5/16 down the bore.
    Advancing or retarding the cam to equalise this up, so its close to even on both banks.
    It will run but be advanced on one side and retarded slightly on the other.
     
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    Last edited: Jul 18, 2007
    OwnBlock, Jul 17, 2007
  10. WIDEOPEN231

    WIDEOPEN231 Member

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    Found this out by accident. Right side bank will all be lower cranking compression.Motro will run like this and will be close but not optima. I had a TFX-92 block with 45* cam rand 6.08 everywhere,should have bracket raced damn thing.This was 1994 and 5.90 was strong runs. Car was normally low 6.0 and maybe high 5.90 once in while.

    If in doubt just run cc test boith sides and iuf right is all lower. wrong cam.
     
    #10
    WIDEOPEN231, Nov 3, 2024

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