running 40 dells in a standard 2litre bus,thinking 60 idles ,replacing 46,have 175 airs ,140 mains replacing 118,e-tubes are 9164.1,vents are 28's,does anyone know what difference 9164.2 e-tubes would make

Cant see a 9134.1 listed here

http://cgi3.ebay.com/ws/eBayISAPI.dll?ViewUserPage&userid=alfa1750 

I will have a look in my Dellorto book tonight and see if they list it



OK - have a read here
http://drlas.co.uk/jetting2.aspx 

That info/link is interesting, but when talking emulsions, it has no reference to which is richer/leaner and where in the rev range/main jet operation that the change occurs, so you need to buy them all to phisically see the differences.......Doh!

There is a good chart giving ALL the variations in the Dellorto book from CB by Bob Tomlinson, page 67

so with 9164.1 e tubes i should be jetting it a bit richer,maybe 60 idles 175 airs 150-160 mains