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Thread: Adjusting tappets with reground cams

  1. #1

    AccordB20A's Avatar
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    Adjusting tappets with reground cams

    Ever since i bought my B20A which has some unknown spec cam regrinds its been loud as fuck in the cylinder head. pretty safe to say the valves needed adjusting so i pulled out the manual today and set them accordingly. but when i was done i started it up and fuck it ran like ass. Wouldn't idle so i turned it up to 1500rpm and it idled rough as fuck and it didnt make much power till like 4500rpm where it went hard to its limiter. (7k)

    Do the specs need to be different for the different cams?

    I was unhappy with the car so i waited till it cooeld down and got a bigger feeler blade and reset them to a bigger gap, Now Its quiet and makes really good power all through the rev range. All thats fine yet it idles at 1000rpm very unstably. sometimes it will stall.

    Any ideas? were the valves set at a big gap when i got them for a reason?



  2. #2
    SEi User Hauntd ca3's Avatar
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    Re: Adjusting tappets with reground cams

    i would have thought that as long as you set the tappets with a cold motor they would have been fine.
    also, big cams wont produce good vacum at idle, which is why it prob wont idle well at 1000.
    especially if you dont have a decent after market ecu

  3. #3

    AccordB20A's Avatar
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    Re: Adjusting tappets with reground cams

    they are quite mild cams really. they have kiwi cams 294 or 394 engraved onto the end of them whatever that means

  4. #4

    AccordB20A's Avatar
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    Re: Adjusting tappets with reground cams

    aaand its running stock obd0 still. when i reshell my car into the new chassis i shall make it a "standalone" OBD1 loom from a civic. and do some tuning and see if i can make it fast

  5. #5

    2oodoor's Avatar
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    Re: Adjusting tappets with reground cams

    Just curious what are the specs you're using?

  6. #6
    3Geez Veteran MessyHonda's Avatar
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    Re: Adjusting tappets with reground cams

    when i had my cams they said to set up to factory valve leash. to make more power you will need to upgrade to OBD1 and tune them

    1989 Honda Accord LX-i
    B18c1 swap since 7/2011
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    Redzone tuned

  7. #7

    Dr_Snooz's Avatar
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    Re: Adjusting tappets with reground cams

    I'm surprised valve lash made that much difference. When I had mine out of spec, I had a noisy valve train, but it didn't affect performance. Unless you had them so tight they were not closing. :dunno:
    Dr_Snooz

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  8. #8

    Vanilla Sky's Avatar
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    Re: Adjusting tappets with reground cams

    I had poor performance from a stock engine because the valves were set too loose, for whatever that's worth.

  9. #9

    AccordB20A's Avatar
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    Re: Adjusting tappets with reground cams

    they were definately closing cause the tappet was loose when the valve was shut like they should be. hell knows why it ran like bum

  10. #10

    2oodoor's Avatar
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    Re: Adjusting tappets with reground cams

    Ok what did you set them at finally, in NZ mm? :)

  11. #11

    AccordB20A's Avatar
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    Re: Adjusting tappets with reground cams

    didnt really look. maybe 0.2XXmm

  12. #12

    Dr_Snooz's Avatar
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    Re: Adjusting tappets with reground cams

    Quote Originally Posted by AccordB20A View Post
    didnt really look. maybe 0.2XXmm
    You adjusted according to the manual but didn't look at the specs? Why do I get the feeling that there is more to this story?
    Dr_Snooz

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  13. #13

    AccordB20A's Avatar
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    Re: Adjusting tappets with reground cams

    at 1st i adjusted them to what the manual says, which is ".08 -.12mm inlet" and ".15-.20mm exhaust". started the car and it wouldnt idle and had no power. so i got the next biggest feeler gauge (0.25something mm i think) and set them ALL to that and it works better now

  14. #14

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    Re: Adjusting tappets with reground cams

    I think that by leaving the lash loose, you're not getting the full lift and duration out of the cams though. So it's like running a more mild cam. I might be totally wrong on that though.

  15. #15

    AccordB20A's Avatar
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    Re: Adjusting tappets with reground cams

    could be why they were loose when i got it. too agressive for the stock ecu and they lost power with them instead of gained. they never tuned it when it was in their ef cause they couldnt get a dizzy to work on it haha

  16. #16
    3Geez Veteran A18A's Avatar
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    Re: Adjusting tappets with reground cams

    should be mint when you get it chooned with the valves properly adjusted then (Y)

  17. #17
    SEi User Hauntd ca3's Avatar
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    Re: Adjusting tappets with reground cams

    kiwi cams are in palmy north. (06) 355 4945
    ring them and ask what the numbers mean on the cams.
    dont shag around tuning obd1 ecus, pick up a link or something off trade me and do it properly.

  18. #18

    AccordB20A's Avatar
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    Re: Adjusting tappets with reground cams

    probably best to call them up and see. also tuning an OBD1 ecu is just as good as any link ecu as long as its not running CROME lol

  19. #19
    SEi User Hauntd ca3's Avatar
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    Re: Adjusting tappets with reground cams

    personally, i'd use an aftermarket ecu. but thats just the way i like to do things.
    may cost a bit more to start with, but i still think its the best way to do things in the long run.

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