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b17a vs b16a

Discussion in 'Engine Building' started by h1coupe, Dec 17, 2003.

  1. h1coupe

    h1coupe Member

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    what exactly is the difference of these two?
    i have a b16 crank, head, ecu, sensors, rods and some other stuff can i use that all and just use the b17 block?
    will that make the motor 1.7l or will i have to get the b17 crank to do that?
    i read somewhere that the b17 block was the same as the b16!
    if i put together a motor using b17 crank and block and everything else from a b16 would that be a b17 then?
     
  2. jotec

    jotec Junior Member

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    the crank is what gives the b17 the added displacment. the blocks are the same.
     
  3. theb17guy

    theb17guy Member

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    aren't b17 rods longer? I think they are...somebody correct me?
    the only two differences are compression ratio and stroke between the two motors.
     
  4. MaliWho97

    MaliWho97 Senior Member

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    B17a Rod length, 5.208"
    B16a Rod length, 5.290"

    Info from Crower.com
     
  5. K2e2vin

    K2e2vin Senior Member

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    the b17 rods are shorter because it has the larger stroke(81.4mm i think vs. 77mm on b16)
     
  6. JDMilan

    JDMilan Senior Member

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    as far are power gains, surprisingly the tq curves are almost identical, maybe a tad more in the 1.7
     
  7. allgo

    allgo Senior Member

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    can the b17 crank just go straight in a b16 block with b16 rods ect.. will it work or will it be a disaster? will it be worth doing?
     
  8. SixtySecondAssassin

    SixtySecondAssassin Senior Member

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  9. simplyfast

    simplyfast Senior Member

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    b16 has a stroke of 77.4, while the b17 has a stroke of 81.4. the question you now need to ask is the stroke:rod length ratio for the b17 better than the b16's?
     
  10. SixtySecondAssassin

    SixtySecondAssassin Senior Member

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    since the stroke is longer in basically the same block, its pretty obvious that the rod/stroke ratio will be lower than that of the b16
     
  11. simplyfast

    simplyfast Senior Member

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    exactly. the b17 also has the same deck height as the b16...hold on, i need to find a metric:imperial conversion chart.

    b17a, 132.3mm; 5.208" rod length:stroke ratio is 1.625
    b16a, 134.4mm; 5.290" rod length:stroke ratio is 1.736

    so think about it. the b17 stroke will cause the piston to sit exactly 4mm higher in the cylinder than the b16 stroke, but the length of the b16 rods will recoup 2.1mm, so the final difference is the b17 setup will sit the piston 1.9mm higher in the cylinder.
     
  12. SixtySecondAssassin

    SixtySecondAssassin Senior Member

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  13. K2e2vin

    K2e2vin Senior Member

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    you dont need to convert to find rod ratio. as long as they are both measure in same system(mm or inch, whatever it be) the answer will always be the same.

    what?? the b17 and b16 should have piston-deck clearances are about the same.
     
  14. SixtySecondAssassin

    SixtySecondAssassin Senior Member

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    the wrist pin location on the pistons are probably different
     
  15. simplyfast

    simplyfast Senior Member

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    they should huh? i think sixty hit it on the head. but i dont know for sure cause im lookin thru all my piston catalogs and i cant locate a b17 piston or any data on it...but i gotta say, the je catalog with the girl droppin trouse...smokin, i want to buy her.

    the b17 could also run a flat dome allowing it to sit higher in the cylinder while keeping its low 9.7:1 comp ratio down.

    found this also. not a lot of data but the pictures speak volumes.
     
  16. K2e2vin

    K2e2vin Senior Member

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    frankenb.xls--xls file(excel spreadsheet). on last page shows rod, r/s ratio, stroke, etc. it turns out the b17 has a larger deck height; about .07mm taller.
     
  17. simplyfast

    simplyfast Senior Member

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    the site i posted claims both deck heights are 263mm.

    but .7mm would create a difference of 1.2mm.
     
  18. xj0hnx

    xj0hnx I wanna be sedated VIP

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    B17A1 connecting rods are 137mm, 81.4mm stroke, 1.683 r/s
    B16A2 connecting rods are 134mm, 77mm stroke, 1.740 r/s
     
  19. K2e2vin

    K2e2vin Senior Member

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    thats pretty tall, the b18/b20 blocks have deck heights of ~212mm. i think you have the number for block* height. the rod-stroke deck height(instead of height to deck its centerline of wrist pin, which is what the xls file uses) is 181.5mm for b18/b20 with the b16 at 172.5mm, b17 at 172.57mm.
     
  20. clomonolo

    clomonolo New Member

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    Do they work because I'm in the same boat. Can b16 rods work with a b17 block/ crank
     
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