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  1. #1

    Thumbs down Timing advance on a 300 motor....anyone slotted the crankshaft gear yet?

    In the 250/260 days we used to advance the timing on the crankshaft gear a few degrees........Anyone done it yet?

    What kind of results did you have....????

    If no one has done it, I think that I will as long as I run the

    93 Octane fuel.

    Hurricane 1000



  2. #2
    Moderator #985 lasportsmn's Avatar
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    Somewhere we have had this discussion already.
    I will try to find it.

  3. #3
    nicjak's Avatar
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    good luck with that lol thats alot of slots you will have to cut on the new wheel of which is held on by a spline
    best you find another way to do it, motec works for me

    Quote Originally Posted by Hurricane1000 View Post
    In the 250/260 days we used to advance the timing on the crankshaft gear a few degrees........Anyone done it yet?

    What kind of results did you have....????

    If no one has done it, I think that I will as long as I run the

    93 Octane fuel.

    Hurricane 1000

  4. #4
    Banned User
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    does the motec work fine for you or are they still figuring it out for you and its just a shameless plug for them? first part of your post was helpfull the second is not an answer thats even possible for 99% of the people on here..... thanks for the help though!

  5. #5
    nicjak's Avatar
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    mike the motec has been working fine from day one smokes any other 300, not too sure what you are meaning by a shameless plug for them though? obtaining the perfect tune is always going to be ongoing, we are more than happy with the progress so far and obtained some great lambda data last thursday thanks for asking.. im sure the speedmagic and tbm adjustable front covers fit but i wouldnt like to try it unless i had the data or knock protection in place.

  6. #6
    "just sayin".. jetdave56's Avatar
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    is'nt the timing already advanced on the 300 from 250/260...I just past my 5 hr break in and started opening her up.....the acceleration is already soooo sick!!....

  7. #7
    Don't do the timing rotor mod on the 300X.
    I know someone who already did and the engine was very short lived after that.

  8. #8
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    Quote Originally Posted by lasportsmn View Post
    Somewhere we have had this discussion already.
    I will try to find it.
    i asked that question is on my build thread

  9. #9
    Moderator #985 lasportsmn's Avatar
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    ok I have not had luck finding what I was looking for but I have heard of someone doing it with the same results as MeanGreen mentioned.
    Thanks

  10. #10
    Here is the scenario when the engine is running harder and hotter with the advanced timing.

    1. The combustion temp gets very hot and the detonation would start to happen, melting the edge of a piston or two. Just like you would see on 2-stroke pistons when ran too hot. This is just a very beginning of the catastrophe.




    2. The detonated/damaged piston lets the combustion pressure/gas pass into the crankcase - excessive blowby.

    3. The crankcase pressure becomes excessively high and pumps out the engine oil into the air intake system, including the intercooler. Blackened engine oil would be pouring out...





    Some of the oil even reached the TB.


    4. Your engine is starting to lose oil, and with little or no oil at all, moving metal parts get real hot, discolor to black, start to seize, break, etc.

    Look at the rod, how hot it got.


    5. This is happening real fast and you are NOT noticing it IMMEDIATELY. And you keep going, going and suddenly your ski comes to a sudden halt with the ear piercing beeping sound with "OILP" warning light on the dash.

    6. Crank rod bearing seiezed, broken rod, punctured crankcase, etc. Notice the scrathced piston






    Notice the stuck lower rod cap.




    This used to be the lower connecting rod and the cap.




    Learn a lesson from someone else's mistake.

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