+- Austinsevenfriends (https://www.austinsevenfriends.co.uk/forum)
+-- Forum: Austin Seven Friends Forum (https://www.austinsevenfriends.co.uk/forum/forumdisplay.php?fid=1)
+--- Forum: Forum chat... (https://www.austinsevenfriends.co.uk/forum/forumdisplay.php?fid=14)
+--- Thread: Mystery Tappet. (/showthread.php?tid=256)
Mystery Tappet. - Robert Foreman - 19-09-2017
I have recently been loaned this tappet shown below in my quest for non adjustable Ulster tappets.
I wonder if anyone can tell me what it is from?
RE: Mystery Tappet. - Colin Reed - 21-09-2017
Hi Robert,
Would you be able to post the measurements Please
Colin
RE: Mystery Tappet. - Robert Foreman - 22-09-2017
Colin,
the tappet is the same length as a standard adjustable one.
The cap is 7/16" diameter and a nominal 1/4" high when fitted to the tappet.
Do you perchance have any thoughts about it?
RE: Mystery Tappet. - Colin Reed - 22-09-2017
Hi Robert,
Judging from those sizes when fitted would have about 5/16" gap between cap & valve stem
even with a high lift cam would still leave 1/4"
My thinking is did they use longer stemed Valves in the Ulster Engines
The removable cap does allow for catering for different length valves ether by making a longer cap or
grinding the cap down
Hope that as not confused things more
Colin
RE: Mystery Tappet. - Ian Williams - 22-09-2017
Yes I believe they did use longer valves and different springs, I can not however say for sure that this is an Ulster follower.
RE: Mystery Tappet. - Tony Betts - 22-09-2017
they used longer valves in the grasshopper.
RE: Mystery Tappet. - Stuart Giles - 23-09-2017
Could they be Brooklands tappets? seem to remember a period spec that mentioned longer valves in the Brooklands motors. Also see here. http://www.motorsportmagazine.com/archive/article/march-1926/18/austion-seven-brooklands-super-sports-model
RE: Mystery Tappet. - Robert Foreman - 23-09-2017
Ulster valves are longer than the standard ones and are tulip type.