Washers in re-burn tubes

Mooch

New Member
Jan 23, 2019
88
Jm
Has anyone had experience with putting washers in the ends of re-burn tubes to get longer burn times?
 

webby3650

Master of Fire
Sep 2, 2008
10,284
Indiana
I’ve never heard of anyone taking this approach. Some have restricted the main air intake further than the factory allows. Some use very large blocks of wood to help extend the burn. What unit do you have?
 

Mooch

New Member
Jan 23, 2019
88
Jm
I’ve never heard of anyone taking this approach. Some have restricted the main air intake further than the factory allows. Some use very large blocks of wood to help extend the burn. What unit do you have?
Osburn Stratford
 

therealdbeau

Member
Oct 16, 2018
137
VA
Soon I will be experimenting with reducing the airflow into the secondary tubes to slow my stove down a bit. For me it's not so much to extend burn times but to tame my overactive secondaries. On a full load once my stove gets going the secondaries are so strong that parts of the stove will glow a little bit.

My plan is to fit a chunk of baffle board into the ends of the tubes and then drill the center out effectively reducing the tubes intake volume more or less until I find a sweet spot.
 
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Mooch

New Member
Jan 23, 2019
88
Jm
Interesting, let us know how that works for you. SBI company supplied me with the washers.
 

webby3650

Master of Fire
Sep 2, 2008
10,284
Indiana
Interesting, let us know how that works for you. SBI company supplied me with the washers.
Really? They supplied you with something that will alter the combustion system?
 

bholler

Chimney sweep
Staff member
Jan 14, 2014
18,678
central pa
Interesting, let us know how that works for you. SBI company supplied me with the washers.
Wow did SBI or a dealer do that?
 

Easy Livin’ 3000

Minister of Fire
Dec 23, 2015
2,478
SEPA
Really? They supplied you with something that will alter the combustion system?
There is an old post around where an SBI employee (fyrebug) discussed his own overdraft problem, and said he was reporting the issue to the engineers to try to find a solution. Perhaps this is it?
 

ColdNorCal

Member
Mar 6, 2018
241
Nor Cal
Are the washers to address too much draft? Interesting way rather then installing a damper which is a no can do for an insert.

Washer pics please.
 
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Easy Livin’ 3000

Minister of Fire
Dec 23, 2015
2,478
SEPA
Are the washers to address too much draft? Interesting way rather then installing a damper which is a no can do for an insert.

Washer pics please.
I'm also real curious to see how these look, and what would prevent them from moving around inside the tubes when installing them.
 

ColdNorCal

Member
Mar 6, 2018
241
Nor Cal
Im thinking they are cylindrical, not a flat washer. We will hopefully see :)
 

therealdbeau

Member
Oct 16, 2018
137
VA
How about that. Surely they are not meant to go inside the tubes. Maybe between the end if the tube and where they interface with the rest of the stove.

How much of a difference would you say there is between the hole in the washer and the diameter of the secondary tubes? Your secondary tubes aren't the same diameter as the outside of the washers are they?
 

velvetfoot

Minister of Fire
Dec 5, 2005
9,973
Sand Lake, NY
I wish these existed for my stove. My workaround works but this is factory. I hadn't thought of this approach. Nice.

As an aside, it's amazing how little air the stove can need.
 

therealdbeau

Member
Oct 16, 2018
137
VA
I wish these existed for my stove. My workaround works but this is factory. I hadn't thought of this approach. Nice.

As an aside, it's amazing how little air the stove can need.
How did you go about it ?
 

Easy Livin’ 3000

Minister of Fire
Dec 23, 2015
2,478
SEPA
How about that. Surely they are not meant to go inside the tubes. Maybe between the end if the tube and where they interface with the rest of the stove.

How much of a difference would you say there is between the hole in the washer and the diameter of the secondary tubes? Your secondary tubes aren't the same diameter as the outside of the washers are they?
On my SBI stove, there would be no way to install them, except inside the tube, as the tube sticks into the walls of the stove on both sides. Perhaps the Stratford has a completely different arrangement. There would be nothing to keep them from flopping over inside the tube and coming to rest at an angle. Maybe that would be ok, though.
 

webby3650

Master of Fire
Sep 2, 2008
10,284
Indiana
Sbi provides this same firebox to a few manufacturers, Osborn, Enerzone, Hearthstone to name a few that came to mind. I’ve installed Several of all three versions. It’s hard to tell from the pics, but the washers look larger than the tubes to me. This is the first I’ve heard of this revision, no dealer service notifications have been sent out that I’m aware of. I’m really surprised they are able to offer a part that alters it’s combustion system after it’s been tested.