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DC Sabre piston and liner. - 10/11/2012 6:00 AM   
gossie


 

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From: Gold Coast , AUSTRALIA
Status: offline 		Wanted a good DC Sabre 1.5cc diesel piston and liner please.  Also a gudgeon pin would not go astray.

(I found two Sabre crankshafts that has given me a good one for my Grandson, and if I am able to get the above another.)


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RE: DC Sabre piston and liner. - 10/11/2012 3:12 PM   
Diesel Die-hard


 

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Status: offline 		Don't have a spare, Gossie, but a thought that I will share with the group is the fact that the main downfall of the Sabre in performance (and probably durability) terms was the weight of the piston.  That amazingly heavy slug pounding up and down with no counterbalance was definitely not good for vibration, always a major power robber.  It must also have been very hard on the rod bearings. The things run far better and last a lot longer  if you can get someone to mill out the piston interior (leaving the bosses intact and retaining sufficient sidewall thickness).  I've always milled out the pistons in my own "fliers", and the difference is very noticeable.

Actually, the same comment applies to a number of British diesels of my acquaintance.  Both the AM 35 and the FROG 349 are prime examples of engines with overly-heavy pistons.  I have always milled those out too (for engines whch I plan to use), and the difference is quite startling.  The reason that this wasn't done at the factory was presumably cost - building down to a price never produces the same results as building up to a standard.

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RE: DC Sabre piston and liner. - 10/11/2012 4:07 PM   
Mr Cox



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Status: online 		Is that a thinning of the skirt only, or more elaborate work near the pin too?

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RE: DC Sabre piston and liner. - 10/11/2012 6:41 PM   
Diesel Die-hard


 

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I turn a bit of metal out of the interior below the pin bosses, leaving enough thickness below the pin for adequate strength as well as sufficient wall thickness.  I then use an end mill having more or less the same diameter as the spacing between the bosses (or the diameter of the standard interior "hole", if you prefer) and mill a full-depth race-track shape out to the internal face of the turned-out piston walls.  This leaves the length of the pin bearings unaffected while reducing piston weight quite comsiderably. You need to make up a split collet in which to hold the piston without distorting it or marring the working surface - I use a machine nut of suitable dimensions, which I bore out to just over piston diameter, cut the split along an edgeand then line with thin gasket material.  Excessively tight mounting is discouraged ....... This seems to work fine - absolute precision is not required here.   


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RE: DC Sabre piston and liner. - 10/11/2012 10:35 PM   
gossie


 

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From: Gold Coast , AUSTRALIA
Status: offline 		Thanks for info. on Sabre pistons.  Agree they are very thick and heavy.

Have been offered a Sabre P&L, but it seems in poor condition, but will try it to see if it's better than the one I have here, so still looking for a good P&L for Sabre please if anybody has one to sell or swap for something.


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RE: DC Sabre piston and liner. - 10/12/2012 1:33 AM   
aspeed


 

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Status: offline 		You could maybe plate the liner?  Maybe someone still does this service.

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RE: DC Sabre piston and liner. - 10/12/2012 3:40 AM   
gossie


 

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quote:

ORIGINAL: aspeed

You could maybe plate the liner?  Maybe someone still does this service.


Yes, or perhaps chrome the piston???????



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