4 replies to this topic

[mini_mentalist_chris]

Hi all, I am currently building a track day car. My engine is 1380, full race head, lightened, balanced and wedged bottom end, 11.5: CR, 296 cam etc etc. I have made the bulkhead modifications to run a weber on a long manifold, and I am currently looking to buy the carb. However, there are a number of different options when it comes to progression holes. For example the Weber 45 DCOE 152 has 3 progression holes, whilst I believe the DCOE 9 has 2. There is the 152G designed with the Ford Zetec in mind which has 4 progession holes to help with flat spots at lower throttle openings. If I am wrong on the number, I'm sorry. I was wondering which how many progression holes are recommended for a highly tuned 1380. Which models do you use? I obviously don't want to spend £300-400 on the wrong spec weber. Thanks, Chris

[Compdoc]

You don't say if you are buying the carb new or second hand. Obviously if buying new, you would expect the supplier to provide the basic specification of carb for your particular requirements.

However, if buying second, third or fourth hand, you may have a carb originally fitted to another model that even started out with the wrong number and size of progression holes and each new owner has probably added or modified the carb to their requirements.

I am sure that someone with a similar spec engine to yours will be able to help, but in the meantime I think I would contact Webcon ([email protected] or call 01932 787100) and ask them the recommended spec of carb for your engine. Then if buying second hand you can check if the carb spec is correct or can be modified to work with your engine.

Always bear in mind that when setting up the engine on a rolling road an engineer used to tuning Webers would be able to fine tune your carb, including progression holes, providing it has not been previously, too molested.

[Dusky]

The progression holes Are much more related to the intended use (performance or economy) of the car than anything else.A mill is needed to drill progression holes and is not something that is typically done on a RR session.

Edited by Dusky, 27 October 2016 - 02:18 PM.

[mini_mentalist_chris]

Thank you very much for the answers guys 

 

I will most likely be buying the carb new, although they crop up from time to time on fleabay for a good price, so I will be keeping an eye out on there too. I won't be modifying the carb, so wanted to get the correct number of progression holes to suit the engine build, as like you say it is only remedied using a mill/pillar drill. As it is a track day/ summer weekend car, fuel economy is not something I am worried about. I basically want it to perform the best it can.

 

I was just wondering what model weber other people use with similar specced engines.

[Dusky]

I've used the dcoe 9 on a Split race setup with 115 wheel bhp.
The dcoe 152G would Be my choice for a road going toy car.

Hope this helps