Oldschool 1800cc jetting advice

[Christoph]

Hey Guys, I hope you can help me.

I´m currently building a "Back in the Days" 1800cc engine and would appreciate jetting and venturi size advices for my Ida´s

specs:

-AS41 case
-74mm counterweight crank
-88 Thick Wall Mahle/Empi Nicasil P&C
-light flywheel, 8 doweled
-Engle w110
-74g lifters
-slightly ported heads, stock 35,5x32 valves and springs
-8,5:1compression
-factory rockers
-Bosch 010
-blue Bosch coil
-26mm oilpump
-deep sump
-912 oilcooler
-36hp/early 40hp shroud
-glasspack/35mm header (I know it´s small, will update it later)
-48 ida, 42mm vent at the moment
-not sure if short or tall manifolds?
-Berg linkage
-factory fuel pump
-car is running 6V

Any suggestions are very welcome!!!

Thanks,
Christoph

[Jim Ratto]

32mm vent if you can find them for 48IDA
55 idle x 110 air corrector/jet holder
135 main w/ F2 tube
180 air corrector

But remember, pinpointing jetting on the internet is a real guessing game.

[Sarge]

But remember, pinpointing jetting on the internet is a real guessing game.

 

That bein' said, I had a couple of engines similar to this.  My combo wound up being 140ac, f7, 145m and 120/65 on the idle circuit with the 37mm vents.  It was
eye watering at idle but made good power both as an 1800 and as an 1835 with either a 110 or 125 Engle cam.  Like Jim pointed out though, it's a seat of the pants
deal; you gotta make the call yourself!  Good luck!

[Christoph]

A huge thank you to both of you, now I have a guideline I can work with!