Jump to content

Nominations for Tractor of the Month
Garden Tractors and Parts on eBay



Photo
- - - - -

Project Briggs 8s


  • Please log in to reply
20 replies to this topic

#1 bowtiebutler956 OFFLINE  

bowtiebutler956
  • Senior Member
  • Contributor
  • Member No: 10021
  • 659 Thanks
  • 796 posts
  • Location: Harlingen Texas

Posted February 27, 2013 - 05:03 PM

 Before all the Briggs guys here go to telling me the is no such thing as a Briggs Model 8s, let me just say, your right. My son Nathan who will be turning 10 in a few months has expressed a desire to do a project of some kind with me. I restored a 52 Bantam GT last year for my youngest son Danny, and although Nathan isn't really into tractors like Danny is, he is you typical boy, who loves things like gokarts, and motorcycles. That being said, I've decided we're going to build a vintage looking minibike. The Briggs 6s was widely used on gokarts, and minibikes, but I though we would try to make something a little more powerful. I decided to build a 8s, using a model 8 squaretop block, and convert it to a roundtop, and use a 6s carb, gas tank, governer, etc. I will also be modifying a 6s/model N head for use on it, as I want this engine to look just like a 6s to all but the sharpest Briggs guys. Of course we'll be doing a little porting in the valve area, along with using the heavyweight flywheel, and anything else we can do to squeeze a little more power from it. Here are a few pics for comparison or both the model 8, and 6s block side by side. You'll notice they're almost identical, other than bore size, and intake valve size. There are also pics of the square, and round top magneto plates side by side. Thanks

 

Matt

Attached Thumbnails

  • DSC08113 (800x600).jpg
  • DSC08114 (800x600).jpg
  • DSC08115 (800x600).jpg
  • DSC08116 (800x600).jpg
  • DSC08117 (800x600).jpg
  • DSC08118 (800x600).jpg
  • DSC08119 (800x600).jpg

  • powerking56, CRFarnsworth, boyscout862 and 2 others have said thanks

#2 Ryan313 OFFLINE  

Ryan313

    PK Fanatic

  • Super Moderator
  • Staff
  • -GTt Supporter-
  • Contributor
  • Member No: 7087
  • 3,239 Thanks
  • 5,159 posts
  • Location: Wallkill, NY

Posted February 27, 2013 - 05:06 PM

Just yesterday, I was wondering when we would see another Briggs restoration from you! This is going to be a great one to follow!
  • bowtiebutler956 said thank you

#3 Amigatec OFFLINE  

Amigatec

    Collector of Rusty Junk

  • Senior Member
  • -GTt Supporter-
  • Contributor
  • Member No: 5899
  • 2,023 Thanks
  • 3,172 posts
  • Location: Haskell Oklahoma

Posted February 27, 2013 - 05:14 PM

And it's just perfect timing. I have a Model 8 I'm working on right now.
  • bowtiebutler956 said thank you

#4 bowtiebutler956 OFFLINE  

bowtiebutler956
  • Senior Member
  • Contributor
  • Member No: 10021
  • 659 Thanks
  • 796 posts
  • Location: Harlingen Texas

Posted February 27, 2013 - 05:23 PM

 Here are a few more pics. Some of the pics show the valve ports after cleanup. No heavy porting, just removing all sharp edges in the port, and blending the valve seats into the port. There is also a pic of the head I modified for the 8, along with a pic of both an 8, and a 6 head gasket side by side to show the difference in combustion chamber shape between the 8, and 6. There is also a pic of the major components being used in this build. Just so everyone understands, no vintage engine were harmed in the making of this 8s. :bigrofl:  This is being built completely from spare parts, and parts engines in my inventory. There are also a few pics of an all original 6s with the optional recoil start I have. I love this little engine, as it starts first pull every time, and is just a great example of a great running original model 6s. When the 8s is done, it should look just like this, only shinier. :thumbs:

 

Matt

Attached Thumbnails

  • DSC08120 (800x600).jpg
  • DSC08122 (800x600).jpg
  • DSC08123 (800x600).jpg
  • DSC08124 (800x600).jpg
  • DSC08126 (800x600).jpg
  • DSC08127 (800x600).jpg
  • DSC08111 (800x600).jpg
  • DSC08112 (800x600).jpg

Edited by bowtiebutler956, February 27, 2013 - 05:25 PM.

  • CRFarnsworth said thank you

#5 Amigatec OFFLINE  

Amigatec

    Collector of Rusty Junk

  • Senior Member
  • -GTt Supporter-
  • Contributor
  • Member No: 5899
  • 2,023 Thanks
  • 3,172 posts
  • Location: Haskell Oklahoma

Posted February 27, 2013 - 05:44 PM

My Model 8 has a threaded stud in the end of the shaft, I haven't looked at it close enough to see if its screwed in, pressed in or made as part of the shaft.

#6 bowtiebutler956 OFFLINE  

bowtiebutler956
  • Senior Member
  • Contributor
  • Member No: 10021
  • 659 Thanks
  • 796 posts
  • Location: Harlingen Texas

Posted February 27, 2013 - 06:13 PM

My Model 8 has a threaded stud in the end of the shaft, I haven't looked at it close enough to see if its screwed in, pressed in or made as part of the shaft.

 I assume your talking about the PTO end of the crank? I have a Briggs NP with the end of the crank threaded for use on water pumps, but I've never seen one with a stud sticking out of the end. I would like to see a pic of it.

 

Matt



#7 Amigatec OFFLINE  

Amigatec

    Collector of Rusty Junk

  • Senior Member
  • -GTt Supporter-
  • Contributor
  • Member No: 5899
  • 2,023 Thanks
  • 3,172 posts
  • Location: Haskell Oklahoma

Posted February 27, 2013 - 06:25 PM

It looks like it's screwed in.

Attached Thumbnails

  • IMG_1178.JPG
  • IMG_1179.JPG
  • IMG_1180.JPG
  • IMG_1182.JPG

  • CRFarnsworth said thank you

#8 bowtiebutler956 OFFLINE  

bowtiebutler956
  • Senior Member
  • Contributor
  • Member No: 10021
  • 659 Thanks
  • 796 posts
  • Location: Harlingen Texas

Posted February 27, 2013 - 06:41 PM

 Very cool, none of mine even have any female threads in the end of the crank where you could screw a stud in too. Buy any chance, is that a mechanically governed 8? I notice it has the casting boss for a mechanical governer. Actually, I would like to see pics of the whole engine. :bigrofl:  I love these old engines. :thumbs: 

 

Matt



#9 Amigatec OFFLINE  

Amigatec

    Collector of Rusty Junk

  • Senior Member
  • -GTt Supporter-
  • Contributor
  • Member No: 5899
  • 2,023 Thanks
  • 3,172 posts
  • Location: Haskell Oklahoma

Posted February 27, 2013 - 06:46 PM

Yes it has the mech gov.

I'll get more pictures up soon.
  • bowtiebutler956 said thank you

#10 Nato77 OFFLINE  

Nato77

    Old Iron Junky

  • Senior Member
  • -GTt Supporter-
  • Contributor
  • Member No: 9422
  • 1,638 Thanks
  • 1,331 posts
  • Location: Minnesota

Posted February 27, 2013 - 07:25 PM

This should be an interesting build. Goin to shave the head also? Maybe a new Id plate with 8s on it?

 

What you should do is call up Will and ask for a rebuild kit for a 8s. :D


  • bowtiebutler956 said thank you

#11 Amigatec OFFLINE  

Amigatec

    Collector of Rusty Junk

  • Senior Member
  • -GTt Supporter-
  • Contributor
  • Member No: 5899
  • 2,023 Thanks
  • 3,172 posts
  • Location: Haskell Oklahoma

Posted February 27, 2013 - 08:01 PM

So I don't hyjack your thread I'll be posting my pictures in the DB Saw thread.


  • bowtiebutler956 said thank you

#12 bowtiebutler956 OFFLINE  

bowtiebutler956
  • Senior Member
  • Contributor
  • Member No: 10021
  • 659 Thanks
  • 796 posts
  • Location: Harlingen Texas

Posted February 27, 2013 - 08:04 PM

This should be an interesting build. Goin to shave the head also? Maybe a new Id plate with 8s on it?

 

What you should do is call up Will and ask for a rebuild kit for a 8s. :D

 That would get him going Nate! :bigrofl:  Even after opening up the chamber on the N head, its still a smaller chamber than an 8 head, so I don't think I'll shave it. My son will be riding it alot, so I don't want to raise the compression up so high that it runs hot. :thumbs:

 

Matt


  • Nato77 said thank you

#13 superaben OFFLINE  

superaben
  • Senior Member
  • Contributor
  • Member No: 11204
  • 7,664 Thanks
  • 5,677 posts
  • Location: Shenandoah Valley, VA

Posted February 27, 2013 - 08:45 PM

8S is the engine Briggs should have made, anyway, so its about time someone creates one!  I'll be following the project with interest.  I really like the little Briggs cast iron engines. 

 

Ben W.


  • bowtiebutler956 said thank you

#14 Texas Deere and Horse OFFLINE  

Texas Deere and Horse

    RED Wild Hogs, Horses & Deeres

  • Staff Admin
  • Staff
  • -GTt Supporter-
  • Contributor
  • Member No: 1435
  • 14,464 Thanks
  • 15,392 posts
  • Location: East of San Antonio Texas

Posted February 28, 2013 - 12:11 AM

Matt, This is going to be a great build and I'll be following along to see how it goes. Great as always. :thumbs:


  • bowtiebutler956 said thank you

#15 powerking56 OFFLINE  

powerking56

    Collector of stuff

  • Senior Member
  • -GTt Supporter-
  • Contributor
  • Member No: 359
  • 907 Thanks
  • 1,805 posts
  • Location: New Hampshire

Posted February 28, 2013 - 11:53 AM

What a great idea and use of spares!!  As common and plain jane as the 5s & 6s series are they are some of my favorite Cast Iron Briggs engines.


  • bowtiebutler956 said thank you




Top