Weber IDF Main jet help Options

[tornik550]

I am in the process of tuning my car after a rebuild. I have dual weber 40's. My engine is a 2.27L. Everything is going pretty well. I am slowly getting the jetting closer and closer. I was driving around at about 60mph yesterday. The head were hotter than I like (325 degrees). I checked the spark plugs and they were bone white. The main jets were at 160. I increased them to 170 (above 160 I only have increments of 10). With the increase to 170, the car is running very well and the temp at around 60mph cruising is around 275. I sped home, tuned off the car and took out the plugs- bone white. I was quite surprised.

The main jet size sounds high too me. Does it sound high to everyone else? Is it possible that I am needing a high main jet size because of the float level? I have my floats set at 10.5 with the gasket.

Any opinions would be greatly appreciated

[tornik550]

My idf's have 32 vents. I am definitely changing the main jets and not the AC jets. My idles are 65. Idle seems to be fine. I think that I have the mixture screws out about 2 full turns.

I also have a set of 34 vents. I stayed with the 32 vents because I thought they would be easier to tune. Is this correct? Should I just change to the set of 34's? I do have a metal lathe so I could shave them down to 36mm if needed. How can I tell if I need bigger vents?

I would like a set of 44 idfs but I don't want to spend the money (my wife is getting fed up with my hobbies).

If anyone is interested in trading a set of 40 idf's for 44 idfs let me know (IMG:style_emoticons/default/w00t.gif)

[ME733]

My idf's have 32 vents. I am definitely changing the main jets and not the AC jets. My idles are 65. Idle seems to be fine. I think that I have the mixture screws out about 2 full turns.

I also have a set of 34 vents. I stayed with the 32 vents because I thought they would be easier to tune. Is this correct? Should I just change to the set of 34's? I do have a metal lathe so I could shave them down to 36mm if needed. How can I tell if I need bigger vents?

I would like a set of 44 idfs but I don't want to spend the money (my wife is getting fed up with my hobbies).

If anyone is interested in trading a set of 40 idf's for 44 idfs let me know (IMG:style_emoticons/default/w00t.gif)

You have not stated ....what AIR correction jet size you have......Before you continue to go up in main jet size, which you will shurely have to do with bigger VENTURIS.......It seems to me that you should sort out what you have /and are using FIRST....this is the principal of one change at a time, get data, before changing /altering again/some more.....many factors are involved in getting your particular engine running /jetted perfectly., as "tomeric914" has stated.... It is my opinion that if we knew the AIR correction JET size , feed back from these posts could have more validity, and be of more use to you.