Thanks Thanks:  0
Likes Likes:  0
Results 1 to 2 of 2

Thread: convert

  1. #1
    Team Member tsrt's Avatar
    Join Date
    Aug 2006
    Posts
    17
    Post Thanks / Like

    Default convert

    new project to convert a yammie from gasoline to alcohol, need advise on timing, compression,jetting and so on

  2. #2
    Team Member zul8tr's Avatar
    Join Date
    Oct 2008
    Location
    Orlando, Fla
    Posts
    509
    Post Thanks / Like

    Post Yama conversion

    No specifics but here are general items to consider:

    What type alcohol are you planning: methanol M, ethanol E, isopropanol I?

    Converting to alcohol requires a larger fuel jet. For pure alcohol engines converted from gasoline the jet may need to be about 2x the area of the gasoline equivelant. Better to start too large a jet than to small or lean.

    Alcohol burns much cooler than gasoline. M has the highest cooling effect, than E than I with gasoline the lowest. This effect allows for a denser charge to the cylindere thus potentially more power from this effect even though alcohol has lower BTU/lb than gasoline with I best, E next than M the lowest BTU/lb. Increasing compression will further increase the power output. Not sure of what the upper limit on compression ratio would be.

    Alcohol has a slower flame speed than gasoline therefore more spark advance is generally needed -careful here as too much is bad for the pistons.

    http://www.boatracingfacts.com/forum...ead.php?t=5472

    A colder spark plug is generally needed. Testing is required to determine the best plug for the use.

    Alcohol has greater anti knock properties than gasoline. M (rich setting) best, than E than I.

    Start with a cold plug and rich jetting and back into the best jetting and plug.

    Need some Yama guys to provide specifics

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Steve Roskowski's Ignition Sytem For Merc just found another convert!
    By John (Taylor) Gabrowski in forum Technical Discussion
    Replies: 0
    Last Post: 05-23-2006, 09:33 PM

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •