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JJ914's Avatar
 
Join Date: Nov 2004
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Porsche Crest Weber Info

Hello,

In the next month or so I want to replace the progressive Weber on my 72' 1.7 with Duel Webers. I thick the 40 IDF's would be the best. I would like to know if anybody else uses them on there 1.7. Or if there is something better ( other than the original FI which I dont have). And how do they work in the colder weather. Any input would be great.
Thanks,
Jason
72' 914 1.7
Old 12-28-2004, 05:52 PM
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Is your mind made up on sticking with carbs? The stock fuel injection will give the best drivability and do the best in colder weather.
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'90 964 Cabrio - daily driver 220K miles
Old 12-29-2004, 11:41 AM
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Porsche Crest

Thanks the stock FI would be cool but ealier owners took out alot of stuff, really messed it up it would be very expensive to get the FI to work again. But I would love to have it , if was cost affective.
Jason
Old 12-29-2004, 02:37 PM
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There are aftermaket FI systems avail. Do a search on 914club.com for aftermarket FI.
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Old 12-29-2004, 02:54 PM
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40 IDA or IDF carbs have been used successfully on 1.7s in the past. Some people are real fans of the Dell'Orto family of carbs; they flow more for a given size throat and they evidently have better "progression" behavior going from idle to full throttle. But they aren't made any more and can be hard to get parts for . Dell 36es or 40s should work fine for a 1.7 if you can get them in good shape.

I prefer FI, but especially if you don't know what's in the motor already the carb setup is probably easier to deal with.

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Old 01-02-2005, 04:21 PM
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Thanks,

What is the differance in the 40 IDF and IDA.

Jason
Old 01-02-2005, 07:00 PM
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40's should be fine, with probably 32/34 venturis... which cam are you using? what's your CR? valvetrain stock? where do you live? what's your elevation?

those are questions you need the answer to to decide the proper jetting on the carbs. as for where to get some, John at Pelican (888-280-7799, ext 248) should be able to give you a good deal on some new ones, or CB performance. if you want used ones, try ebay.com or shoptalkforums.com, maybe thesamba.com.

Let us know if you have more questions or need more help...
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1989 Chevy Silverado 3500 - 454TBI, 4x4, 8 gallons/mile
Old 01-02-2005, 07:23 PM
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Hey,

My 1.7 is stock except for progressive weber and 009 dist. And I live in Eastern North Carolina Evevation about 100 feet. Should I look for IDAs or IDFs.
Jason

Last edited by JJ914; 01-02-2005 at 08:01 PM..
Old 01-02-2005, 07:41 PM
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IDF's will be easier to find, and are gonna be fine for you. I'd use 115 main jets for your application, but your still never gonna get the proper mixture thru the rev range. In other words, you're likely going have a nice lean spot, but 125's will probably be too much jet for your engine.

Where are you in NC? I'm from up around the Greensboro area.
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Jason Porter - 888-280-7799 ext 233 - jason@pelicanparts.com

1989 Chevy Silverado 3500 - 454TBI, 4x4, 8 gallons/mile
Old 01-02-2005, 08:02 PM
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Great thanks for the info, even with a lean spot it should be better than the prog weber ever is. My only worry is cold mornings.
I live in Goldsboro.

Jason
72 914
64 VW Type 1
Old 01-02-2005, 08:11 PM
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Cold mornings it should fire right up with the slightest feathering of the throttle. It'll more likely be after the engine is at full operating temperature that it requires full throttle to fire.
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1989 Chevy Silverado 3500 - 454TBI, 4x4, 8 gallons/mile
Old 01-02-2005, 08:33 PM
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