 40 or 44 IDF Webers, size matters |
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| 930cabman |
 Apr 14 2021, 05:00 PM
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#1
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Advanced Member  Group: Members Posts: 3,064 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States 
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We are converting a stock 2 liter 4 cyl from D jet to Webers. My gut is telling me a 40 IDF with 32mm venturis is the correct starting point. I am considering purchase of a complete set of 44 IDF's, but are unable to locate 32 mm venturis. Assuming 32MM venturis can be found are 44 IDF"s too large for a stock 2 liter?
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| johnhora |
Apr 14 2021, 05:38 PM
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#2
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Senior Member Group: Members Posts: 866 Joined: 7-January 03 From: Derby City KY Member No.: 107 Region Association: None
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930cabman...
what's wrong with the stock D-Jet? have you tried to get it to work? If converting a stock engine to carbs use 40IDFs since no change to cam. |
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| 930cabman |
Apr 14 2021, 06:06 PM
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#3
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Advanced Member Group: Members Posts: 3,064 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States
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QUOTE(johnhora @ Apr 14 2021, 05:38 PM)  930cabman... what's wrong with the stock D-Jet? have you tried to get it to work? If converting a stock engine to carbs use 40IDFs since no change to cam. Several years ago I came upon a low mileage rust free Alfa spider (flood car), after rebuilding pretty much the entire car, the D jet stumped me with it's sensors, ECU and a million electrical connections. I found a set of Weber40 DCOE's and never looked back. If/when a FI system is reasonably new and working I would service it, but working from a basket case, no way. Tooo many variables |
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| brant |
Apr 14 2021, 09:01 PM
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#4
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914 Wizard Group: Members Posts: 11,624 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains 
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QUOTE(930cabman @ Apr 14 2021, 06:06 PM) QUOTE(johnhora @ Apr 14 2021, 05:38 PM) 930cabman... what's wrong with the stock D-Jet? have you tried to get it to work? If converting a stock engine to carbs use 40IDFs since no change to cam. Several years ago I came upon a low mileage rust free Alfa spider (flood car), after rebuilding pretty much the entire car, the D jet stumped me with it's sensors, ECU and a million electrical connections. I found a set of Weber40 DCOE's and never looked back. If/when a FI system is reasonably new and working I would service it, but working from a basket case, no way. Tooo many variables What year Alfa? The spiders never came with Djet actually They were spica and then motronic DME Your car would be worth learning d jet They are a great and reliable system actually Almost like they were made for the car.... |
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| 930cabman |
Apr 15 2021, 05:02 AM
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#5
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Advanced Member Group: Members Posts: 3,064 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States
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QUOTE(brant @ Apr 14 2021, 09:01 PM) QUOTE(930cabman @ Apr 14 2021, 06:06 PM) QUOTE(johnhora @ Apr 14 2021, 05:38 PM) 930cabman... what's wrong with the stock D-Jet? have you tried to get it to work? If converting a stock engine to carbs use 40IDFs since no change to cam. Several years ago I came upon a low mileage rust free Alfa spider (flood car), after rebuilding pretty much the entire car, the D jet stumped me with it's sensors, ECU and a million electrical connections. I found a set of Weber40 DCOE's and never looked back. If/when a FI system is reasonably new and working I would service it, but working from a basket case, no way. Tooo many variables Once again, Thank you to all who responded for your information. My gut was telling me to go on the "small side" with regards to carb size. Anybody have a twin 40 IDF setup available? What year Alfa? The spiders never came with Djet actually They were spica and then motronic DME Your car would be worth learning d jet They are a great and reliable system actually Almost like they were made for the car.... 1985 Alfa spider, maybe it was L jet, but very similar. ECU, sensors, many many connections. When operating correctly the Bosch system is far superior to any carb system, but with 50 years old stuff, it's another story |
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| Superhawk996 |
Apr 15 2021, 05:42 AM
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#6
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914 Guru Group: Members Posts: 5,826 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch
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QUOTE(930cabman @ Apr 15 2021, 07:02 AM) When operating correctly the Bosch system is far superior to any carb system, but with 50 years old stuff, it's another story Just for the record. That's what everyone said in the late 80's too. Not a carb hater by any stretch. Just think it's funny that the debate rages on 30 years later and I hear the same arguments out of both sides of the debate. (IMG:style_emoticons/default/laugh.gif) |
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Posts in this topic
930cabman 40 or 44 IDF Webers Apr 14 2021, 05:00 PM
nditiz1 40 IDFs are best, but 44s will work if you choke t... Apr 14 2021, 05:11 PM barefoot Question: is the diameter air the manifold interf... Apr 14 2021, 05:17 PM
brant
1985 Alfa spider, maybe it was L jet, but very si... Apr 15 2021, 08:58 AM roblav1 At what what RPM is max HP? I'll take a swag ... Apr 14 2021, 06:15 PM 930cabman This is a stock 2 liter 4 cylinder engine. my gut ... Apr 14 2021, 06:19 PM roblav1 My 5800 rpm swag was off. My 914 spec says max hp... Apr 14 2021, 06:27 PM 930cabman
My 5800 rpm swag was off. My 914 spec says max h... Apr 14 2021, 06:40 PM type2man I would run 44 Webers. Personally I run 45 dells o... Apr 14 2021, 06:36 PM IronHillRestorations You want 40's. With that engine the vacuum si... Apr 14 2021, 07:11 PM Root_Werks
You want 40's. With that engine the vacuum s... Apr 15 2021, 09:29 AM johnhora OK so you have:
Stock 2.0L type 4 with stock FI ca... Apr 14 2021, 07:20 PM johnhora CB Performance's Bob Tomlinson's' book... Apr 14 2021, 07:29 PM 930cabman For me, it comes down to simple.
Bolt on carbs, ... Apr 15 2021, 05:46 AM nditiz1 Simplicity for me too. I worked with the black ma... Apr 15 2021, 06:11 AM VaccaRabite When I had my 2056 carbed I tried 44s and 40s.
Th... Apr 15 2021, 07:02 AM 930cabman
When I had my 2056 carbed I tried 44s and 40s.
T... Apr 15 2021, 07:27 AM Racer I ran 40's on a "stock" 1.7 and the ... Apr 15 2021, 07:50 AM Tdskip For 90% of your driving throttle response matters ... Apr 15 2021, 08:26 AM ClayPerrine I am on the side of Fuel Injection.
I have run ... Apr 15 2021, 12:19 PM 930cabman It's looking like D jet might be winning.
Fi... Apr 15 2021, 12:49 PM 930cabman I committed to D jet, sending the ECU to Module Ex... Apr 16 2021, 01:08 PM ClayPerrine
I committed to D jet, sending the ECU to Module E... Apr 16 2021, 01:11 PM 930cabman
I committed to D jet, sending the ECU to Module ... Apr 16 2021, 03:08 PM bbrock
I committed to D jet, sending the ECU to Module E... Apr 16 2021, 01:52 PM Superhawk996
I committed to D jet, sending the ECU to Module E... Apr 17 2021, 08:13 AM bbrock I've gotten the impression from reading variou... Apr 17 2021, 08:36 AM Superhawk996
I've gotten the impression from reading vario... Apr 17 2021, 08:52 AM 930cabman Yes, I have gathered the same, these rarely fail, ... Apr 17 2021, 01:05 PM stownsen914 I didn't read the whole thread, but my experie... Apr 17 2021, 04:48 PM 930cabman
I didn't read the whole thread, but my experi... Apr 17 2021, 05:21 PM |
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