I have two different charts that give two different settings:
28 vents, 1.35 main and .55 idle or
32 vents, 1.45 main and .60 idle.
Bought a set of EMPIs for a 2.0 which came with:
28 vents, 1.25 main and .52 idle
Read MANY threads here, samba and type4forum on proper jetting and vents and they are all over the place.
Would like to get these together and installed asap.
Is the current set up good enough for daily driving to/from work?
No track, no AX, just cruising around TN back roads.
The only help I can offer is to share my experience with my 44idf Webers. My engine is 2.2 liter type IV. My carbs are set up with 32 vents, F11 emulsion tubes, 130 main jets, 175 air jets and 55 idle jets. When the engine was first built it ran great once past about 2200 rpm. Prior to that it would NOT come off idle very well at all. A change of Idle jets pretty much solved that problem. About the best advice I can give is to buy, borrow or steal something to measure air/fuel mixture. This device and test drives might help you decide the jetting combination you want. It may take a bit of experimenting (and patience) to find the best combination for your engine but I think you will eventually get there. Good luck.
Cheers, Elliot
If they are 40s you want to start with a base of 28 vents , 115 main, 50 idle.
You can pull the main stack and solely drive around on just the idle to get a feel for the idle jets and where they will drop off. There are overlaps at each stage of the progression and you want to dial in each stage for best overlap in performance
40s on a bone stock 2.0.
The 40s with the 28mm venturi. Good response off idle. Pretty good mileage. Put them on and see what you get. Swapping jet and such is simple with the carbs installed. New linkage? Don't forget the phenolic FI intake bases.
I'll 2nd the set up with the 28's
I don't know my Delorto 40's came with 28's and it drove like a vw bus. I changed to 34's.
with Perry,that jetting is a good starting point,those vents will provide good response and power in the normal driving range @ the expense of small power loss @ rpm you rarely use.
Keep the fuel pressure around 3psi and the engine properly tuned and you will have a nice running motor.
They come new with 28mm vents... mine did. I ran them for a long time. Maybe if you are in to fuel economy and you only drive at low rpm you will be happy. I can tell you from experience that w/ 28's you give up pretty much all performance at mid to high rpm.
I started with:
28 vents
.65 idle
1.22 main
195 air
Changed to:
34 vents
.60 idle
1.32 main
180 air
Of the two choice you posted I would go with the 32's but I think a 1.45 main might be too big. The .60 idle you list should be good.
Op states 'bone stock 2.0'. I think the cam will be the limiting factor. It's going to runout of steam at the top end and I doubt he's going to run around @ 5.8k. Not a racer or ax'er. Driveability is the key.
40 IDF's on a 2L?
28mm vents
47.5 - 50 idle jets (elevation near sea level or slightly above?)
120-125 main (likely 120)
180-190 air correctors
F11 tubes
Drive-ability when going to a performance carb such as an IDF is a bit of a trade off. Performance generally equates to less drive ability overall. No carb heat would be one thing on those brisk cool days.
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