Technical DCOE45 Side Draft Conversion on 124 Spider...

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Technical DCOE45 Side Draft Conversion on 124 Spider...

skinnywhite

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I recently acquired a set of DCOE45s and have begun the process of removing the FI from my 1981 124 Spider using the Guy Croft intake. Of course I had to remove the brake assist and relocate the master cylinder etc.

My question is this: is anyone running DCOE45s on a 2-liter engine, and if so what are some ballpark jet sizes etc? I've already put in 34 MM venturis. -Best Regards, Michael
 
skinnywhite said:
I recently acquired a set of DCOE45s and have begun the process of removing the FI from my 1981 124 Spider using the Guy Croft intake. Of course I had to remove the brake assist and relocate the master cylinder etc.

My question is this: is anyone running DCOE45s on a 2-liter engine, and if so what are some ballpark jet sizes etc? I've already put in 34 MM venturis. -Best Regards, Michael


Use this program; it'll take you near enough so you can fine tune from there;

Jetting program

Also, emulsion tubes make a big difference in getting those last 5% of performance, and operation smoothness, but mess with them only after the jets are tuned just right. Contact me if you need emulsion tubes tables or emulsion tubes themselves, I can get them for you.

The carbs must have an airbox made, it also makes quite a difference.
The volume of airbox for 2.0 tc must be about 8 to 10 litres with an opening of 90 mm diameter on one side (intake air in the box).
 
FiatGroup said:
Use this program; it'll take you near enough so you can fine tune from there;

Jetting program

Also, emulsion tubes make a big difference in getting those last 5% of performance, and operation smoothness, but mess with them only after the jets are tuned just right. Contact me if you need emulsion tubes tables or emulsion tubes themselves, I can get them for you.

The carbs must have an airbox made, it also makes quite a difference.
The volume of airbox for 2.0 tc must be about 8 to 10 litres with an opening of 90 mm diameter on one side (intake air in the box).

Thanks very much. I'll watch out for the emulsion tubes once the jets are close enough to get the thing running right, it seems to have a flat spot that my mechanic thinks is the "acceleration pumps sticking." As for the air box, I'd planned on just putting some screens on the stacks. Do you recommend a box for balanced airflow reasons?
 
Ok, that's all right. Airbox is not there for any reasons concerning airflow distribution or similar, it has much more to do with intake air pulses and such....

Pretty complicated, but just trust me that airbox will cover 95% of flat spots you may have now, and engine will have much more torque down low without loosing any rpm screaming ability.
With that level of work put in it, IMHO airbox is a required item to make use of all the power that engine can give. Also, it will smooth out it's operation nicely.
 
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