Synchrometer Recommendations, Your "secrets" on Carb Sync tools Options

[Martin Baker]

What size venturis are you running?  Carbs are 40's?

And I use the STE

I do not have any of that info, other than the carbs are 40's. I have not taken anything apart just yet, I wanted learn more before I do anything. I just won a Uni-syn on e-bay, and am bidding on the Redline type as well. I got the Uni for $20 new in the box. I'll know on the other in another day. I will just buy one if I don't win this one. John Dunkel might know the info on the carbs. He told me that it has clogging issues on the idle's.

JP, as far as shifts, you wouldn't believe how it is where I work, I have no set shift, no days off, vacation, benifits, etc. My Boss says Christmas is just another day. If there is a plane on the ground, no matter how long, I am there. The Aviation buisness has little concern for those who make it happen. My record so far is a 23 hour day, at work. That makes for a real interesting drive home after work. Soon as my Wife finishes her Degree, I am done fixing jets...I will try my luck at an education. They say you are never to old. Not sure if I agree. But I will try. I have tried to break into the automotive scene, at least they are off on Sunday's, and don't work to late into the night.

[J P Stein]

I don't have the book handy JP. What size venturis are you running? Carbs are 40's?

And I use the STE

Ayup, 40s with 34 mm venturi.

I get clogged jets occasionally. When I put the thing together, I made the mistake of trying to seal a questionable fitting with teflon tape..down stream of the filter..bout every 6 mos or so, I get a little bird's nest in an idle jet to remind me that I'm a dumb shit. (IMG:style_emoticons/default/sad.gif)

Continual jet clogging should be dealt with. It is not normal. A good filter close to the carbs....clean out everything down stream of the filter...including the carbs. Good winter project. (IMG:style_emoticons/default/biggrin.gif)

[Martin Baker]

I had not actually looked at the ID info on the carbs for exact letters/numbers until now, my carbs are 40 IDTP 3C . What makes these different than say just a 40 IDA 3C ?

[d7n7master]

Mercury gages rock. You can monitor both sides at the same time. BUT - be very careful. Mercury can be a PITA if not handled with care. (IMG:style_emoticons/default/wacko.gif)

[Gint]

I had not actually looked at the ID info on the carbs for exact letters/numbers until now, my carbs are 40 IDTP 3C . What makes these different than say just a 40 IDA 3C ?

That makes them stock 914/6 carbs (40 IDTP 3C) as opposed to 911 units (40 IDA 3C). Not mutch real difference actually. Not sure of the details. Seems like there was a post regarding that very thing in the last couple of months.

[Martin Baker]

I have spent most of this day reading about these carbs, I found that the factory manuals shows 40 IDT P1 3C1, or 40 IDT P1 3C. These are 40 IDTP 3C. I am still trying to find the exact differences.

[michel richard]

J P,

Thanks. I must say I thought you had ben refering to a particular method of using the synchrometer itself. I just stick it on the throttle opening and read. Guess you do the same.

Adjustment of the MFI appears to be slightly different than carbs. I did have to start from scratch, and adjust the throttle stops, then the individual linkagages etc . . . Quite a bit of work.

I still have a couple of issues to work out, but it's coming along.

I sometimes have pretty heavy smoking at idle. which looks like oil, and it goes away as soon as I give it a little throttle. Engine was rebuilt not long ago and the stem seals should be OK. Is there anything else that can cause this ?

Michel

[Carl]

Martin,
Here's the link to the thread we had recently dealing with some similar questions.

http://www.914world.com/bbs2/index.php?act...f=2&t=13373&hl=

Carl

[maf914]

I have spent most of this day reading about these carbs, I found that the factory manuals shows 40 IDT P1 3C1, or 40 IDT P1 3C. These are 40 IDTP 3C. I am still trying to find the exact differences.

I just checked the Haynes Weber manual and they list the original equipment Weber carbs for various cars. For Porsche 2.0 sixes there are six different carb numbers listed, all beginning with 40 IDT, with diferent jet and venturi combos. I think Weber used the number variations to designate these different combos.