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Is this cam too much?

Discussion in 'Engine Building' started by BBFROMAL, Apr 11, 2004.

  1. BBFROMAL

    BBFROMAL Junior Member

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    Im wonderin if the crower 405 cams n a b18b with b16 pistions is too big of a cam.
     
  2. pissedoffsol

    pissedoffsol RETIRED

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    i didn't even know they madce a 405... i thought 404 was their largest.

    for a street application, i'd say its too big.

    b16s will give you about 11:1. with a huge cam, you're going to want more compression....

    11:1 for 403's
    12:1 for 404's
    12.5:1 + for 405's
    would be my best estimate for a good compression ratio for the cam
     
  3. asmallsol

    asmallsol Super Moderator

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    you can run 404's with less compression.

    I have seen someone run 9.5:1 and still make this dyno (again have to post it just since it is so impressive)

    [​IMG]

    This is styleTEG's dyno. The top line is his b18b with crower 404's, and the bottom is a tuned ITR.
     
  4. StyleTEG

    StyleTEG Senior Member

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    Doing some dynamic compression calculations I found that at 11.6:1 on a B18B with 404s, you are going to gain 25% cranking pressure. This is pretty much the sweet spot for honda engines and performance. Any higher than that and you will increase parasitic loss to the point where you will end up blunting your top end power.
     
  5. BBFROMAL

    BBFROMAL Junior Member

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    yea to be honest ive been lookn at the 404s just confused asto if i wanna go ls/vtec and do cams later on or do a ls with cams righr now btw this is goin n a 92 cx hatch
     
  6. cycloneb18c3

    cycloneb18c3 Senior Member

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    you cant do really large cams on a ls/vtec because the pistons come really close to the valves on stock cams, 404s might hit, you have to clay the pistons and see if it hits.
     
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