Author Topic: t35 rebores.  (Read 2823 times)

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Offline george sutton

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t35 rebores.
« on: 01 Nov 2009 at 13:06 »
From standard size, what sizes of piston can one go up on a rebore, -010"?  -020"? up to ??
that is for a 1947 t35 engine.    ive been reading that sleeving is a NO,NO. Also are the domed pistons still available, and from where?  george S

Offline eddie

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Re: t35 rebores.
« Reply #1 on: 01 Nov 2009 at 14:43 »
Hi George,
                  Although oversize pistons were originally available for the T35 Mk1, they are now in very short supply and you may have to search long and hard for them. As you say, resleeving is not recommended as the barrels are very thin just above the base flange, and have been known to break in this area. Several owners of early T35's have resorted to using barrels from the generator engine - these just need the upper fins trimmed away to clear the finning on the underside of the head (around the exhaust port). Most of these barrels still have good bores as the generator engines seem to have had very little use. Also, on the generator engine barrels, there is a block between the tappets to prevent them from rotating, whereas the motorcycle barrels have full circle tappets that are free to rotate. Either set up can be used, but if changing to the motorcycle set up, the hole for the stud that retains the block will need plugging.
      The pistons from the generator engine can also be used - they are almost identical - just the ring configuration is slightly different.
                                         Regards,
                                                      Eddie.

Offline george sutton

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Re: t35 rebores.
« Reply #2 on: 01 Nov 2009 at 17:45 »
Hi George,
                  Although oversize pistons were originally available for the T35 Mk1, they are now in very short supply and you may have to search long and hard for them. As you say, resleeving is not recommended as the barrels are very thin just above the base flange, and have been known to break in this area. Several owners of early T35's have resorted to using barrels from the generator engine - these just need the upper fins trimmed away to clear the finning on the underside of the head (around the exhaust port). Most of these barrels still have good bores as the generator engines seem to have had very little use. Also, on the generator engine barrels, there is a block between the tappets to prevent them from rotating, whereas the motorcycle barrels have full circle tappets that are free to rotate. Either set up can be used, but if changing to the motorcycle set up, the hole for the stud that retains the block will need plugging.
      The pistons from the generator engine can also be used - they are almost identical - just the ring configuration is slightly different.
                                         Regards,
                                                      Eddie.
thanks yet again, Eddie, will have to keep my eyes and ears open then.Geoge S