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| Aftermarket Side-draft carbs including Weber DCOE and DCOM and Dell'Orto |
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#2 (permalink) |
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Opeler
Join Date: Feb 2005
Location: Federal Way, Wa
Posts: 115
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jetting the 45 DCOE
Well...I've got the same side-draft carb on my 2L Opel.
I have a larger cam and ported heads with lots of air flow. I tried the recomended jet sizes for a stock engine of that size but it would run at an idel and not when you open the throttle...too lean, probably because my engine has alot more air-flow than stock. With an O2 analyzer reading of 1 percent O2 in the exhaust, I finally ended up with 185 jets in an f8 tube...ya, it sounds big, but you can see for your self... My car runs great ! p.s. The DCOE series I've found has a slight flat spot during acceleration...Just the nature of the beast. |
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#3 (permalink) | |
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Cunning Linguist
Join Date: Mar 2002
Location: Plano, TX 75074
Posts: 4,441
Real Name: Otto
![]() Provided Answers: 13
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__________________
1960: ♥ '61 Rekord PII 1.7 3S 3.9 ♥ '69 Kadett LS 'sprint' 1.9 3A 3.18 1970: ♥ '70 GT 1.9 4S 3.44 ♥ '72 GT 2.2SSD 5S 3.44 ♥ '72 GT 2.4FI 5S 3.44P 1980: ♥ '85 Bitter SC 3.9FI 5S 3.44P 2000: ♥ '09 Solstice GXP Coupe 2.0 SIDI VVT Turbo 5S 3.73P |
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#4 (permalink) |
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Opeler
Join Date: Feb 2005
Location: Federal Way, Wa
Posts: 115
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Dcoe 40
Your right, there is no means of adjusting the transition mixture on the DCOE.
I've been sort of leary of drilling on my carb Kummel - I hope we've added some insight to your carb project. Steve Last edited by Crusher; 03-08-2005 at 12:23 AM. Reason: correction |
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#5 (permalink) | |
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Cunning Linguist
Join Date: Mar 2002
Location: Plano, TX 75074
Posts: 4,441
Real Name: Otto
![]() Provided Answers: 13
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That's why the term idle jets and idle air bleeds are such a misnomer . . . they only cover HALF their functionality! And why do you think Weber offers a range of DCOE40 and 45 "types" and it's always recommended that you use the same "type" on an engine? . . . because they were originally designed for engines of a specific displacement and breathing efficiency.
__________________
1960: ♥ '61 Rekord PII 1.7 3S 3.9 ♥ '69 Kadett LS 'sprint' 1.9 3A 3.18 1970: ♥ '70 GT 1.9 4S 3.44 ♥ '72 GT 2.2SSD 5S 3.44 ♥ '72 GT 2.4FI 5S 3.44P 1980: ♥ '85 Bitter SC 3.9FI 5S 3.44P 2000: ♥ '09 Solstice GXP Coupe 2.0 SIDI VVT Turbo 5S 3.73P |
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#7 (permalink) |
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Old Opeler
Join Date: Jun 2003
Location: New Zealand
Posts: 5,686
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For an "everyday" car the standard cam will be OK as it makes peak power above 5,000 rpm and the DOCEs' will allow better power anyway.
Just keep the venturis down in size (30 to 34 mm) for better low end response. This may restrict your hi-rev power but most everyday drives operate at the low rev range most of the time. So just "tune" those 45s' to the rev range most often used.
__________________
GTJim Opel Owner since last Century! Copyright © 2000-2009 J D Henry All Rights Reserved |
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#8 (permalink) |
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Project 1450 supporter...
Join Date: Mar 2002
Location: Pleasant Valley, CT
Posts: 7,452
Real Name: Bob Legere
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Jim is absolutely right, the choke (venturi) size is very important. You can use the 45 DCOE on a standard 2.0 but you should run a small venturi for good torque and mixture signal. I would probably use 32 mm. If you have long air horns (trumpets) then that would be better too for road use.
Make sure that your exhaust pipe diameter is not too large as well. I would not go larger than 2.25" (58 mm), but you may be better off with 2" (51 mm). Bob |
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#9 (permalink) |
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Opeler
Join Date: Jan 2005
Location: Estonia
Posts: 30
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what emulsion tube should i use?
I m planning to order some stuff from finland and i want to get everything. I have fuel and air jets, im planning to go for 34mm chokes. because im planning to work with head also. Today i got a new clutch, you can also use 2 liter kadett GSI clutch and senator 2,5 disk. it has 6 polts instead of original 4 polts |
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