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Gatornapper |
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Senior Member ![]() ![]() ![]() Group: Members Posts: 1,241 Joined: 22-September 17 From: Woods west of Richmond, VA Member No.: 21,449 Region Association: South East States ![]() ![]() |
Questions re: Weber 44 IDF carbs:
1. Is anyone running these on a stock engine, and if so, how do they perform? National Carburetors kit for stock engines is 34 ICT's, lightly modified 40 IDF's, and only 44's on heavily modified engines. 2. What problems do you introduce using 44's? other than dumping too much fuel in the engine...... 3. Venturi's are 45mm, someone pointed out that one should use 40mm venturi's - is that with a stock engine? 4. Anyone run 44's and then convert back to EFI? How did that go? Labor cost? TIA, GN |
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Bleyseng |
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#2
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Aircooled Baby! ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 13,035 Joined: 27-December 02 From: Seattle, Washington (for now) Member No.: 24 Region Association: Pacific Northwest ![]() |
All this badmouthing Djet, bah. Its a simple system, runs better than carbs as that's why Porsche used it.
Problems are the FI wiring harness which lays on the hot engine and gets brittle with little shorts in it. Get a new harness. Problem #2 is the MPS blows out making the car run rich, really rich. New diaphragms are available now and the MPS is easily calibrated to stock. Problem #3 is the CHT goes out and the engine runs super rich. This is the ONLY failure I have had with Djet since 1998 and it happened in my driveway. I had 40 Dells on my car when I bought it and 1995 and had soo many problems with them. Keeping them in sync, cold starting was a hassle, etc. Run great at full throttle but who drives around at full throttle? The stock Djet 2.0L throttle body is 45mm. |
Gatornapper |
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#3
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Senior Member ![]() ![]() ![]() Group: Members Posts: 1,241 Joined: 22-September 17 From: Woods west of Richmond, VA Member No.: 21,449 Region Association: South East States ![]() ![]() |
I have never badmouthed D-jet, and up until recently when I finally got the 44's dialed in, considered it an option once the solid internals of the engine itself was established.
I am good with carbs, and have been doing them for over 50 years, although Weber's are new to me - now I really like them. Totally understanding the limitations of a cam for FI without the lift or duration needed for carbs, I still can't understand how the air from 4-36mm venturi's can be matched by the air through one 45mm throttle body......but my old memory thought I measured my '76 D-jet system as having a 34mm throttle body.....all packed away nicely now, but I may just unpack it to re-measure it again. I may be wrong. Won't be 1st time, won't be last. And no question FI is better than carbs overall....hands down. First worked on them in 75 on a '72 Volvo.....loved the system. One other question: have I heard incorrectly that the ECU's often go bad, and good rebuilt ones are very hard to find? I think even Eric at PMB told me that, and strongly advised me to not put the D-jet in the car. GN All this badmouthing Djet, bah. Its a simple system, runs better than carbs as that's why Porsche used it. Problems are the FI wiring harness which lays on the hot engine and gets brittle with little shorts in it. Get a new harness. Problem #2 is the MPS blows out making the car run rich, really rich. New diaphragms are available now and the MPS is easily calibrated to stock. Problem #3 is the CHT goes out and the engine runs super rich. This is the ONLY failure I have had with Djet since 1998 and it happened in my driveway. I had 40 Dells on my car when I bought it and 1995 and had soo many problems with them. Keeping them in sync, cold starting was a hassle, etc. Run great at full throttle but who drives around at full throttle? The stock Djet 2.0L throttle body is 45mm. |
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