Lotus Elan

Dellorto Problem

PostPost by: ennio wong » Tue Mar 29, 2005 12:56 pm

Hi Elan enthusisats,

I acquired a restoration project of +2 130/5 convertible(not running) last year, only this year I have time to start the work.

The car has only 15K miles on the odometer and has a QED port & polish head. Last week, I overhauled the Dellorto pair in order to make it running again. After putting them back with a re-built kit, I then noticed something wrong with them, there was no pump jet in the carbs! that's why I had so many small O-rings leftover!

I just wonder were the pump jets removed with purpose? to improve acceleration?

In addition, if I snap open the throttle valve, the pump lever move down about 2mm. Is this 2mm stroke sufficient to pump extra fuel for sudden acceleration?

Thanks in advance for any input.

Ennio in Hong Kong
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PostPost by: types26/36 » Tue Mar 29, 2005 3:04 pm

If I remember correctly the pump stroke can be adjusted by the nut on the pump rod, by adjusting the length of stroke (which controls the amount of fuel injected) and changeing the pump jet (which controls the time over which the fuel is injected) a reasonable amount of varation in fuel is possible. I cant think of a reason to remove the pump jets altogether as the fuel would be dumped in and not injected into the opening port area, I would think the engine would have very poor acceleration! :huh:
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