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BHP from standard 2.4 engine

Discussion in '206/246' started by VicJano, Feb 4, 2014.

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  1. VicJano

    VicJano Karting

    Dec 17, 2011
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    Chris O'Connor
    #1 VicJano, Feb 4, 2014
    Does anyone have a view on what sort of BHP one should expect from a 27k mile engine, 7 year old rebuild, that's been maintained fairly well at about 6800rpm and 7800rpm. Or failing that does anyone have a power curve please.
    I put mine on a rolling road and got 195bhp at 6800rpm.
    Thanks in advance.
     
  2. Nuvolari

    Nuvolari F1 Veteran
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    #2 Nuvolari, Feb 4, 2014
    I have no empirical data to go on but I would think that 195bhp is an excellent number on a rolling road for a 2.4L Dino engine. At 27K miles (assuming proper maintenance and warm up procedures) the engine is still very much at its best so I would not consider wear to be a factor. What is difficult to judge are the conditions under which the test was done and how this relates to the current carburation of the engine. Without air fuel ratios measured along the curve it is difficult to isolate where the performance is coming from and where there is room for improvement.

    Once my engine is properly broken in I will be taking it to a rolling road and setting the carburetion and ignition advance curve optimizing it for the modern fuels that are available. It is important to note that modern fuels are very different to what was available 40 years ago meaning that original jet sizes for the carbs are nowhere near correct. I suspect that most Dino's out there are running too lean and not making anywhere near the power that they should.
     
  3. Ferraripilot

    Ferraripilot F1 World Champ
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    #3 Ferraripilot, Feb 4, 2014
    I have seen a dyno sheet for a dino showing just over 200bhp at the flywheel on a fresh new engine, so 195bhp at the wheels is very good (unless the dyno is calculating drivetrain loss in which 195 is still ok).

    A 'solid' early carburted 308 engine can make about 195bhp at the wheels, and they flywheel dyno at not more than 235bhp in stock form.
     
  4. rosso corsa motorsport

    rosso corsa motorsport Formula Junior

    Nov 30, 2008
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    #4 rosso corsa motorsport, Feb 4, 2014
    ower 200 bhp on a STD engine??
     
  5. dm_n_stuff

    dm_n_stuff Four Time F1 World Champ
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    #5 dm_n_stuff, Feb 4, 2014
    I put mine on a dyno about 1000 miles after a rebuild to factory specs, using a Euro distributor and slightly more free flowing exhaust. Other than that, the mechanic felt it was pretty much bone stock.

    I'm gonna dig out the dyno sheet and post shortly.

    Dave
     
  6. dm_n_stuff

    dm_n_stuff Four Time F1 World Champ
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    #6 dm_n_stuff, Feb 4, 2014
  7. VicJano

    VicJano Karting

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    Chris O'Connor
    #7 VicJano, Feb 5, 2014
    Nuvolari,
    Thanks for the info and advice. It was 195 at the flywheel and the carburation was set up on the CO2 emissions and the timing set at the advance setting BHP was highest. Your comment about modern fuels meaning that Dinos run lean is borne out by my experiences of the last couple of years. Backfiring and blow back thru the carbs has increased until it had very little power in low revs. I've had the timing and crabs set up by a guy in Hertfordshire who works on a lot of classic racers. This guy (probably in his early seventies) literally just listened to the crabs with his good ear (the other one being deaf) to get the idle jets spot on. The car now runs better than it ever has.

    Chris

     
  8. VicJano

    VicJano Karting

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    #8 VicJano, Feb 5, 2014
    It was 195 at the flywheel and the carburation was set up on the CO2 emissions and the timing set at the advance setting BHP was highest. I've had the timing and crabs set up by a guy in Hertfordshire (UK) who works on a lot of classic racers. This guy (probably in his early seventies) literally just listened to the crabs with his good ear (the other one being deaf) to get the idle jets spot on. The car now runs better than it ever has.


     
  9. VicJano

    VicJano Karting

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    #9 VicJano, Feb 5, 2014
    Dave,

    Yes please post up the dyno sheet.
    Chris

     
  10. Ferraripilot

    Ferraripilot F1 World Champ
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    #10 Ferraripilot, Feb 5, 2014
    That's good power for that engine. Congratulations.
     
  11. dm_n_stuff

    dm_n_stuff Four Time F1 World Champ
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    #11 dm_n_stuff, Feb 5, 2014
    Last edited by a moderator: Sep 7, 2017
    here's the dyno sheet.

    I don't know what you guys assume for drive train loss, but at 15% the car was just a smidge over 200 crank horsepower.


    the link I posted includes some discussion of drive train loss and some good mechanic input as well as the carb settings, etc.

    D
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  12. VicJano

    VicJano Karting

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    #12 VicJano, Feb 7, 2014
    Thanks for that.
     

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