| Briggs Flatty Low-Buck Buildup | |
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+9MoWheeler 1997 Murray redlinemotorsportts Thunderdivine T-Dub13 Jerbear0612 TroyBilt Pony mr.modified Doc Sprocket 13 posters |
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WilliesBuilds Member
Join date : 2013-06-19 Posts : 329
| Subject: Re: Briggs Flatty Low-Buck Buildup January 20th 2014, 8:40 am | |
| Im really diggin this thread , it got me into upgrading my engine now, but im stuck at upgrading the connecting rod im not sure which im supposed to use. my engine series is this one 289700. i know T-Dub mentioned his connecting rod , im just not sure if thats the one i need aswell super lost here lol | |
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Doc Sprocket Site VIP
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Age : 51 Join date : 2013-04-21 Points : 7270 Posts : 2914 Location : Ontario Canada
| Subject: Re: Briggs Flatty Low-Buck Buildup January 20th 2014, 8:49 am | |
| I will continue with mine when I get a bit of free time. Not only do I not mind the "thread jack" but I would actually like to thank T-dub for contributing! | |
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WilliesBuilds Member
Age : 28 Join date : 2013-06-19 Points : 4521 Posts : 329 Location : Florida
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T-Dub13 Established Member
Age : 54 Join date : 2013-12-06 Points : 4524 Posts : 540 Location : Central MA
| Subject: Re: Briggs Flatty Low-Buck Buildup January 20th 2014, 9:23 am | |
| Hello Willies! Sorry this thread got a little confusing. That happens with more than one author / contributor / hijacker I ended up using the Con Rod upgrade for the 28 series motor. Number #494504S. I believe this is a direct upgrade for Con Rod #490348 which I think is the earlier casting number. EDIT: I've confirmed this Conrod upgrade to the best of my knowledge. My 12hp engine originally had Conrod # 490348 and I successfully swapped to the stronger newer conrod #494504S. YMMV | |
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WilliesBuilds Member
Age : 28 Join date : 2013-06-19 Points : 4521 Posts : 329 Location : Florida
| Subject: Re: Briggs Flatty Low-Buck Buildup January 20th 2014, 10:27 am | |
| yeah my parts book says my original conn. rod is P/N:494504 . so with this being said the one you used P/N:494504S Will technicaly fit. Right? Or am i Confused lol | |
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T-Dub13 Established Member
Age : 54 Join date : 2013-12-06 Points : 4524 Posts : 540 Location : Central MA
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WilliesBuilds Member
Age : 28 Join date : 2013-06-19 Points : 4521 Posts : 329 Location : Florida
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T-Dub13 Established Member
Age : 54 Join date : 2013-12-06 Points : 4524 Posts : 540 Location : Central MA
| Subject: Re: Briggs Flatty Low-Buck Buildup January 20th 2014, 11:01 am | |
| Here's what I've found so-far: on HeyMow: "the 494504 old version is from pre '95. The 494504-S is an updated rod from 95 to 98". EDIT: the 494504 has the same size bolts and the "S" has two different size bolts. (Maybe you can confirm this looking at you non-"S" conrod) for us? Apparently the rods with two different size bolts are the stronger ones. So, possibly the "S" make all the difference. (Yeah, please let us know what the bolts look like ob your conrod)!!! Do NOT try to replace any of these rods with the 692419. I made that expensive mistake. The rod is longer and the big end journal is larger.
Last edited by T-Dub13 on January 20th 2014, 11:22 am; edited 1 time in total | |
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WilliesBuilds Member
Age : 28 Join date : 2013-06-19 Points : 4521 Posts : 329 Location : Florida
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T-Dub13 Established Member
Age : 54 Join date : 2013-12-06 Points : 4524 Posts : 540 Location : Central MA
| Subject: Re: Briggs Flatty Low-Buck Buildup January 20th 2014, 11:27 am | |
| OK, thanks for the info. So I'd surmise from the given info that the "S" denotes the Stronger bolt setup with different size bolts. It may very well stand for Strong, or at least we can call it that here. Whether I'd suggest you upgrade is a little different story. Depends on personal preference and cashflow... If you do swap out conrods, I'd also suggest a billett dogbone. I've had a stocker fail before on a governed walk-behind mower before. | |
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WilliesBuilds Member
Age : 28 Join date : 2013-06-19 Points : 4521 Posts : 329 Location : Florida
| Subject: Re: Briggs Flatty Low-Buck Buildup January 20th 2014, 11:44 am | |
| yeah if i swap out the con rod then ill get a billet dogbone cuz their pretty cheap . but idk if i should change it out now lol i think i will anyway ill start building up this engine. Its off an older craftsmanII | |
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T-Dub13 Established Member
Age : 54 Join date : 2013-12-06 Points : 4524 Posts : 540 Location : Central MA
| Subject: Re: Briggs Flatty Low-Buck Buildup January 20th 2014, 11:57 am | |
| Here's the link for the Dogbone. It's sorts hard to find on his website. BILLETT DOGBONEThe minimum order is $50 on that website, so be prepared to pick out some fuel line, gaskets etc... | |
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WilliesBuilds Member
Age : 28 Join date : 2013-06-19 Points : 4521 Posts : 329 Location : Florida
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1997 Murray Veteran Member
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Age : 26 Join date : 2013-11-13 Points : 5398 Posts : 1311 Location : NW USA
| Subject: Briggs Flatty Low-Buck Buildup January 20th 2014, 9:05 pm | |
| thanks for the link! I need one of those for my 15 hp, I took it apart and it had shattered and chewed up the balencer bearing. | |
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T-Dub13 Established Member
Age : 54 Join date : 2013-12-06 Points : 4524 Posts : 540 Location : Central MA
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rarbaugh07 Member
Age : 35 Join date : 2014-01-22 Points : 4029 Posts : 117 Location : Logan, iowa
| Subject: Re: Briggs Flatty Low-Buck Buildup January 22nd 2014, 10:40 pm | |
| Has anyone tried offset flywheel keys for timing advance. Ive wanted to and it would fit your low buck build. | |
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TroyBilt Pony Established Member
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Join date : 2013-06-01 Points : 4762 Posts : 578 Location : West Virginia
| Subject: Re: Briggs Flatty Low-Buck Buildup January 22nd 2014, 11:07 pm | |
| - rarbaugh07 wrote:
- Has anyone tried offset flywheel keys for timing advance. Ive wanted to and it would fit your low buck build.
It can make a difference, just depends on the situation. Usually more needed at higher rpms. | |
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T-Dub13 Established Member
Age : 54 Join date : 2013-12-06 Points : 4524 Posts : 540 Location : Central MA
| Subject: Re: Briggs Flatty Low-Buck Buildup January 23rd 2014, 9:06 am | |
| I have not tried that yet. But you're right about the low buck thing! I guess I will do some research to this specific motor and see if I can find out if the 28 Flatty will benefit from a timing advance and how much. Anyone know this info or tried it? Anyone have results to post? Again, Great idea! I sorta forgot about ignition timing lol! EDIT: AND speaking of timing, I do know that typically, advancing valve timing will move the power up the RPM range. Has anyone experimented with advancing the cam by a tooth? | |
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Doc Sprocket Site VIP
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Age : 51 Join date : 2013-04-21 Points : 7270 Posts : 2914 Location : Ontario Canada
| Subject: Re: Briggs Flatty Low-Buck Buildup January 23rd 2014, 9:10 am | |
| Oh, HOW to you forget timing? LOL....
For the cheap folks out there (I DID say "Low-Buck", did I not?) you can file material off the timing key. Every 0.006" you take off the key, equates to 1° of advance or retard, depending on which way you turn it.
Keep in mind, these engines are designed and optimised to run at 3600RPM or thereabouts. I have not yet done extensive testing in this area, but it's a pretty sure bet that a timing advance won't help much if you're running governed.
Valve timing advance? I haven't tried that at all. Given the number of teeth on the gears, I honestly would think that advancing one tooth is too much...
Last edited by Doc Sprocket on January 23rd 2014, 9:17 am; edited 1 time in total | |
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T-Dub13 Established Member
Age : 54 Join date : 2013-12-06 Points : 4524 Posts : 540 Location : Central MA
| Subject: Re: Briggs Flatty Low-Buck Buildup January 23rd 2014, 9:14 am | |
| Any plans on doing a timing advance on your Flatty Doc? I'm not convinced I would want to on mine because I love the low idle. (still use it as a garden tractor too) So yeah, I'm curious about the benefits vs the losses. | |
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Doc Sprocket Site VIP
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Age : 51 Join date : 2013-04-21 Points : 7270 Posts : 2914 Location : Ontario Canada
| Subject: Re: Briggs Flatty Low-Buck Buildup January 23rd 2014, 9:21 am | |
| Yeah- I'll probably advance the ignition by a few degrees. A few, not a lot. I still need to make a determination as to the final fate of this engine... | |
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WilliesBuilds Member
Age : 28 Join date : 2013-06-19 Points : 4521 Posts : 329 Location : Florida
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T-Dub13 Established Member
Age : 54 Join date : 2013-12-06 Points : 4524 Posts : 540 Location : Central MA
| Subject: Re: Briggs Flatty Low-Buck Buildup August 18th 2014, 3:19 pm | |
| Just checking back into this thread to tell the team that I've beaten this motor for a good year now and it's still running great. I don't think a stocker would have survived this long. I hope this thread has helped a lot of people build their 28 flatty into a great motor! | |
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Guest Guest
| Subject: Re: Briggs Flatty Low-Buck Buildup September 9th 2014, 10:49 pm | |
| - T-Dub13 wrote:
- Just checking back into this thread to tell the team that I've beaten this motor for a good year now and it's still running great. I don't think a stocker would have survived this long. I hope this thread has helped a lot of people build their 28 flatty into a great motor!
any videos?? |
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T-Dub13 Established Member
Age : 54 Join date : 2013-12-06 Points : 4524 Posts : 540 Location : Central MA
| Subject: Re: Briggs Flatty Low-Buck Buildup September 11th 2014, 9:19 am | |
| No good vids yet. I will work on it though. This thing is really a great motor. Plenty of torque and it revs pretty good too. | |
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Doc Sprocket Site VIP
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Age : 51 Join date : 2013-04-21 Points : 7270 Posts : 2914 Location : Ontario Canada
| Subject: Re: Briggs Flatty Low-Buck Buildup September 11th 2014, 9:48 am | |
| Right on... I look forward to seeing. I still haven't finished mine. Too many projects, too many things on my plate. One day... | |
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