Author Topic: 16.5 opposed twin  (Read 2689 times)

0 Members and 1 Guest are viewing this topic.

Offline boxcar

  • Newbie
  • *
  • Posts: 64
  • Karma: 0
  • Gender: Male
  • Brookings, SD
    • View Profile
16.5 opposed twin
« on: May 10, 2013, 08:00:54 pm »
Ok guy's and girls, I picked up a couple riders to play around with. Looking to maybe try my luck at this racing adventure. So, I just started it today, smokes like crazy. Tell me what I should/need do to this thing. I use build my own Briggs 5 hp flatheads for years when I raced karts. I want to tackle this myself but have know clue on what clearances to run for anything this big (rod to crank, piston to wall, ring gap etc...) More thing likely this will need to be a modified racer to pull this old fat butt around  :lol: Any help would be greatly appreciated.

boxcar
Raabe Racing

Offline Jeff McKelroy

  • Professor Ducky
  • Turf Warrior
  • **
  • Posts: 890
  • Karma: 10
  • Gender: Male
    • View Profile
Re: 16.5 opposed twin
« Reply #1 on: May 10, 2013, 08:06:28 pm »
To get all the specifications, I would recommend purchasing the Briggs book, P/N 271172.  Available on Amazon.

Things like stroke, rod length etc. you will have to either search on here or do some math...

Offline boxcar

  • Newbie
  • *
  • Posts: 64
  • Karma: 0
  • Gender: Male
  • Brookings, SD
    • View Profile
Re: 16.5 opposed twin
« Reply #2 on: May 10, 2013, 09:57:59 pm »


So your saying that you run stock Briggs clearances on these racing engines
Raabe Racing

Offline Jim Knutson

  • Mow-Forum Junkie
  • ***
  • Posts: 1310
  • Karma: 11
  • Gender: Male
  • i didnt break it......i modified it!
    • View Profile
Re: 16.5 opposed twin
« Reply #3 on: May 11, 2013, 12:12:38 am »
First off, sorry for the censored words in my post above. Won't happen again...

So your saying that you run stock Briggs clearances on these racing engines
the book will give you the stock clearances, and since you have built air cooled engines for racing before, just go with the clearances you used on them.
If you quit when you're behind, you will never win.

Offline BIG AL 202

  • Highly Mowtivated
  • ****
  • Posts: 3327
  • Karma: 9
  • Gender: Male
  • LET'S GO FIND A NEW PLACE TO RACE MOWERS!
    • View Profile
Re: 16.5 opposed twin
« Reply #4 on: May 16, 2013, 08:25:59 am »
LOOK AROUND HERE AND OTHERS HAVE ASKED. OILING IS A BIG DEAL WITH THE OPPY'S AND ROOSTER HAS QUITE AN ARTICLE ON WHAT HE DOES TO MAKE THEM LIVE. USE THE SEARCH BUTTON ON THE RIGHT AND YOU WILL LEARN ALOT!
ALWAYS VOTE FOR ED!   FONGS BROTHER FROM ANOTHER MOTHER!

Offline meanmachine

  • Turf Warrior
  • **
  • Posts: 139
  • Karma: 2
  • Gender: Male
  • #3-D Race Team
    • View Profile
Re: 16.5 opposed twin
« Reply #5 on: May 16, 2013, 06:19:06 pm »
you can download the oppy manual under the flathead section,one of the first few post, I think roosters oil mod post is there too if it isn't it should be, g- team also has a dvd that is helpful
Sometimes i use my own ideas, even if others think i'm wrong.

 

anything