Nippy crankcase jets. - Printable Version +- 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: Nippy crankcase jets. (/showthread.php?tid=7109)

Nippy crankcase jets. - Robert Foreman - 25-01-2022 Does anyone know what is bore size is for the Nippy crankcase oil jets?  The engine I've just dismantled seems to have been modified. RE: Nippy crankcase jets. - dickie65 - 25-01-2022 I should have some in the garage It is just a case of trying to find which Pile / Box of junk they are in ! I have taken a set out so that I can convert a crankcase into a pressure fed engine. It might take while to find them though. RE: Nippy crankcase jets. - Robert Foreman - 25-01-2022 Thanks Dickie that would be most helpful. RE: Nippy crankcase jets. - Ian Williams - 25-01-2022 Hi Robert, are you using a Nippy crank of has it been updated with a Phoenix of similar? I have had a couple of Nippy cranks pass through my hands and they appear to have very small oil galleries, I opened them out and radiused the entry as one would do with a splash Phoenix. I am afraid that I don't recall noticing a difference in the jets, but that not to say there is not one, I would apply the same thinking you would for any other sporting splash engine, good alignment and high volume. . RE: Nippy crankcase jets. - dickie65 - 26-01-2022 I am sure the Nippy Jets are a different body size to the normal engine. I have taken a 1980s splash fed Alan Crank out to install a Hadley Crank into a sand cast Nippy crankcase. I will try and find the Jets at the weekend to check the size for you. I do suspect that I have damaged them by drifting them out but the gallery side hole should be to size. As far as I am aware the oil pockets in a genuine Nippy Crank are smaller than the stock cranks. Most Nippies were driven harder and by the 1950s most had suffered broken cranks, with the resultant damage to crankcases. I am hoping to have my Nippy engine built and running by the Centenery. RE: Nippy crankcase jets. - dickie65 - 27-01-2022 Hi Robert, I have found one Nippy oil jet that did not get destroyed when I removed it. The buisiness end is a bullnose shape with a 1/16" orfice. The oil galley end is 7/64" ID The ODs are .158" and .177" length is 1.235" with the shoulder inside the oil galley .150" RE: Nippy crankcase jets. - Robert Foreman - 27-01-2022 Dickie,    the ones I pulled out were 3/16" Od. and 1/8" bore.  I don't understand what you mean by a 3/16" orifice at the business end. RE: Nippy crankcase jets. - dickie65 - 27-01-2022 Hi Robert, I made a Typo its 1/16" bore I have made the correction to the measurement. Sorry for the confusion. I used a drill bit to size the bore sizes and a cheap digital caliper for the other dimensions.         RE: Nippy crankcase jets. - JonE - 28-01-2022 how do these measurements sit against standard oil jets? I'll add some of the dimensions to the Nippy FB group and see if anything else comes forward. RE: Nippy crankcase jets. - dickie65 - 28-01-2022 Hi Jon, I might have to see if I have any standard oil jets to compare. How many old Baccy tins will I have to search through ??? I have a complete Nippy engine in bits at the moment. ( Crankcase is at work )