Compression ratios for different engines...

Discussion in 'Motorized Bicycle General Discussion' started by borntofli, Sep 19, 2012.

  1. borntofli

    borntofli Member

    Joined:
    Jul 27, 2012
    Messages:
    305
    Likes Received:
    0
    I have been searching all the china manufacturers and it seems all are 6:1 except for the flying horse which is 8:1....

    I have bought 2 engines from BGF and one has 2 head gaskets and the other has one..... The one w/ 2 gaskets seems to go faster at same rpm than the other...

    Just curious, looking to buy a new engine for my next build.... Stretch cruiser... (Firmstrong chief)

    I am happy with both my engines, have not had 1 single problem in 700 miles....

    Just fishing for others thoughts on this subject...
     
  2. JonnyR

    JonnyR New Member

    Joined:
    May 13, 2012
    Messages:
    1,203
    Likes Received:
    0
    that is probably why i like my flying horse a lot more than my last it feels more powerful it mist be the compression
     
  3. MotorBicycleRacing

    MotorBicycleRacing Well-Known Member

    Joined:
    Jul 28, 2010
    Messages:
    5,705
    Likes Received:
    34
    Come on, do not believe any of the performance figures posted
    on many of the vendors websites.

    Flying Horse crap has the same compression as the rest of the
    Chinese made bicycle engines.
    The only one with higher compression was the Rat motor

    A lot of vendors have the gall to claim 5 to 6 hp!!! :D

    Caveat emptor !!!
     
  4. JonnyR

    JonnyR New Member

    Joined:
    May 13, 2012
    Messages:
    1,203
    Likes Received:
    0
    well if it isnt different why does my flying horse pull like a truck compared to my GT-5 grubee paperweight.
    the grubee was nothing but problems but thats not the point when it was running it never pulled like this
     
    #4 JonnyR, Sep 19, 2012
    Last edited: Sep 19, 2012
  5. Pilotgeek

    Pilotgeek New Member

    Joined:
    Apr 6, 2011
    Messages:
    403
    Likes Received:
    0
    Could be the flying horse is just tuned better. May come with a better tuned carb / different jetting.
     

Share This Page