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Type: Posts; User: digger

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  1. S54: im pretty sure that the graphs in the OP are not...

    im pretty sure that the graphs in the OP are not whp. with dynodynamics the "S_hp" is estimated crank hp (whp x 1.2). a whp graph will say "hp" without the S. if it is from the UK then this is...
  2. S54: absolutely it is natural variation, chassis dynos...

    absolutely it is natural variation, chassis dynos are just not that repeatable plus statistically each engine is different. different wheels and even different brand tires of the same size can...
  3. S54: its like ~2% which is insignificant. there...

    its like ~2% which is insignificant.

    there isnt much chance that a stock capacity S54 will make 280wtq with those mods so i call BS on the 10-12% lower than DJ. the before and after gains are...
  4. delete this pls

    delete this pls
  5. Was more looking at tq/L (closely relates to...

    Was more looking at tq/L (closely relates to BMEP) this is a good look at how well tuned an engine is simply making power with more revs is not hard in today’s world with a 4V engine.
    Out of the box...
  6. you cant even do a proper built old school 12V...

    you cant even do a proper built old school 12V inline BMW for less than 12-15k and you'll end up almost 100 horse short of the S54 so its not much when you look at the whole picture.

    both S65 and...
  7. S14: the overlay is excellent. would be good to see a...

    the overlay is excellent. would be good to see a bone stock 2.3 on the VAC dyno (provided it was fresh low km engine) for comparison
  8. S14: any on the same dyno thought?

    any on the same dyno thought?
  9. S14: in isolation they mean nothing the good aspect is...

    in isolation they mean nothing the good aspect is the overlay to give some meaning
  10. S14: yeah, but there is an easier way to get numbers...

    yeah, but there is an easier way to get numbers with less speculation that's all.

    i'm more interested in the specs of the engine though and what potential the s14 head has in general for making...
  11. S14: if people want dynojet numbers then you really...

    if people want dynojet numbers then you really need to take it to a dynojet, otherwise its purely speculation based off a completely different vehicle tested across almost 3 months. you could spend...
  12. S54: fyi, metric mechanic offset grind S54 cranks to...

    fyi, metric mechanic offset grind S54 cranks to 93mm for their M50/52/S52 engines. the S54 bearing being 51mm vs 46mm for the M52/S52 rods makes it a common size bearing but length still is off but...
  13. some more considerations: - calorific value of...

    some more considerations:

    - calorific value of the fuel to consider (heat release per unit mass)

    - latent heat of vaporization. some fuels can increase power is if they take heat away from the...
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    i am not really convinced that having all runners...

    i am not really convinced that having all runners drawing from the plenum at the same time gives a realistic picture. if you look at the firing order and cam profile for each cylinder and plot it out...
  15. S54: Mike, got any dyno plots of some NA builds you...

    Mike, got any dyno plots of some NA builds you can post?
    how much does the crank weigh?
    does it require a slightly different spec harmonic balancer?
    do you retain stock rod length?
    What rpm...
  16. the lack of material forming a direct load path...

    the lack of material forming a direct load path between bearings significant this rod is obviously not for a high BMEP big bore engine which needs good compressive strength. i still think there is...
  17. if they machined those teardrops and slots from...

    if they machined those teardrops and slots from bothsides and not all the way through leaving 2mm in the centre the stiffness (so it is has shear strength for carrying bending loads) would be alot...
  18. if you look at pinnacles of competitive...

    if you look at pinnacles of competitive Motorsport with engines turning even much higher than this you dont see things like this. it looks like this rod was designed by someone who considered loads...
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    M50/52 + S50/52: what dont you believe?

    what dont you believe?
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    M50/52 + S50/52: it's the mode that the manufacturers of dyno...

    it's the mode that the manufacturers of dyno dynamics (DD) created for doing power runs (as shown on the graph in the legend). it locks in the ramp rate, as well as some of the correction factors and...
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    M50/52 + S50/52: for those not aware multiply numbers by 0.80 to...

    for those not aware multiply numbers by 0.80 to give values at the wheels for dyno dynamics shootout mode. so this would be 258whp to 265whp peak to peak
  22. M50/52 + S50/52: no i just prefer to use logic and reason not...

    no i just prefer to use logic and reason not guestimates
  23. oops i misread i thought he meant average over...

    oops i misread i thought he meant average over whole rpm not that used on a gear by gear basis.
  24. M50/52 + S50/52: if you are suggesting comparing a completely...

    if you are suggesting comparing a completely separate engine with similar specs to see the gain then that is funny.........im not going to waste my time arguing anymore
  25. M50/52 + S50/52: It is unlikely that the changes did nothing or...

    It is unlikely that the changes did nothing or went backwards but it is always nice to see tests on the same machine so it is as scientific as practical. there is just a lot of variability between...
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