Gudgeon Pins

papamoabeachfr, Apr 25, 11:33am
Hi, anyone know where I can obtain some 17mm. pins 82mm. long!These are for a 100 year old motor and would be the largest size i can squeeze into the Rods.
msigg, Apr 25, 12:01pm
Ring around some engine reconditioners, or ebay.
papamoabeachfr, Apr 25, 12:51pm
Done that, longest 17mm pin around 65mmsmallest 82mm long is 21mm. no go either way.
brokebloke1, Apr 25, 12:53pm
maybe you can take pistons and rods to a machine shop and they maybe able to boreout piston !
skin1235, Apr 25, 3:03pm
what engine is it, at 82mm it is going to be a big bore (88 to maybe 95mm), would it even be metric!, and a long stroke,
papamoabeachfr, Apr 25, 3:15pm
Engine is from a 1909 Darracq which has a 86.3mm bore and needs this length of pin as the top of the rod is very wide and has a 14mm pin at present. 17mm is as much as the rod will stand.
intrade, Apr 25, 4:41pm
you can make your own machined and hardened then grinded to size. would be no problem for any propper engeneering shop
intrade, Apr 25, 4:41pm
also be awear of waight balancing with the pin.
supernova2, Apr 25, 4:51pm
If it's a 14mm pin at present why the need to go out to 17mm!
skin1235, Apr 25, 4:54pm
why do you want to change it, it the small end is out of round it can be sleeved, if the pin holes are shot they too can be sleeved

as intrade alludes to, overboring the pin holes and the rod could lead to some serious issue with balance

isn't that original size about the same as early bedford/vauxhall 6cyl
owene, Apr 25, 9:08pm
What sort of revs does this thing do and what sort of compression is it running at! If it's moderately low in terms of pin stress levels, a hunk of EN9B could easily be turned up to suit. Also a bit curious that it's metric - when did imperial start to be forgotten about!
snoopy221, Apr 26, 1:23am
Let alone a few chainsaws run dat pin dia.and prob close 2 lngth
timmo1, Apr 26, 8:21am
Depends on the country!
sifty, Apr 26, 8:38am
Darracq = French = metric.