[Fot] Different Tr3/4 sleeve design

[Mordy Dunst]

Hi John:  

Great question.

I recognized that that grinding off the the valve reliefs would be a potential issue.  Here are some liner specs from the outside in. 
The total width of the liner is 4.105" (not including flat portion). 
The ID of the start of Flat is 3.920"
The OD of the groove is at 3.862". 
The ID of the groove is  3.822"


For a 87mm (3.425) bore this leaves 0.397" ( 3.822- 3.425) space from the edge of the bore circumference to the ID edge of the groove.

For a 89mm bore (3.504") this leaves 0.318". (3.822-3.504)

In my estimation this should leave enough space to make a reasonable relief for the  valve.  I suspect you could get pretty close the inner most portion of the ring groove and be safe.  

Don"t forget the larger the relief the closer the top ring gets to the point in the liner barrel where It could be at jeopardy for blow-by.  Give or take top rings are .230" below the top of the piston . Another concern is loss of CR as the volume removed from the liner has just been added to the combustion chamber total volume.

Hope this helps.

  



MDunst
Headgasket.com
626.358.1616 T
626.628.3777 F
Triple R Munitions, Inc
626.201.9471 T
FFL 6,7 SOT 2



 

 

-----Original Message-----
From: John Styduhar <johnstydo at gmail.com>
To: Mordy Dunst <gasket.works at gte.net>
Cc: Triumph 'Friends of Triumph <fot at autox.team.net>
Sent: Sun, Mar 6, 2016 6:41 am
Subject: Re: [Fot] Different Tr3/4 sleeve design



Hi Mordy, I like your design and the amount of material you have at the top of the liner in case you want to shorten the liners. I wonder if the wire groove would be interfered with after you cut the intake valve relief in the top of the liner.  What sizes are you going to make?



On Sat, Mar 5, 2016 at 4:34 PM, Mordy Dunst <gasket.works at gte.net> wrote:

I've been thinking about the tr tractor motor sleeve/liner for a while -especially after a liner  cracked during a race.  
Went to the drawing board (autcad) and put some of my thoughts in a digital cad  format.  
The owner of  LA sleeve cleaned up my drawing a bit and I am glad to see that the project is completed.


Some comments - some surprising.
1) each liner is about 200 gm lighter than stock. The liner is shortened to be the same   Dimension as the depth of the pocket in the block. 
2) it is substantially stiffer than stock and holds machining tolerances much better.
3) the .040" groove is .035" deep to accept a .040" wire. (Square wire or round)
4) the wire groove on the surface may not need a wire -as the edges on either side  in the groove impart an increased unit surface pressure on the gasket.  The gasket will dimple into this recess and lock. 
5) there is only a single flat on opposing liners.  My understanding of having multiple flats was to rotate and hone the liners during engine/tractor rebuilds.  
6) cooling efficiency not tested.




MDunst
Headgasket.com
626.358.1616 T
626.628.3777 F
Triple R Munitions, Inc
626.201.9471 T
FFL 6,7 SOT 2




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