Best base jetting Dellorto 40 DRLA - 1.6 engine

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Tine
Posts: 5
Joined: Mon May 23, 2011 9:24 am

Best base jetting Dellorto 40 DRLA - 1.6 engine

Post by Tine » Sun Oct 23, 2011 4:09 pm

Hello,

Just wondering about a good starting point for jetting my fairly stock 1.6 engine ( rebuilt, only modifications are 40's dellorto and 4-1 header & muffler). I got the carbs with 30mm venturis, but have changed them with 28s. I can obtain some different jets to set the carbs up properly, but would like to know your opinions on how to set a base jetting to start the motor first time.

Thank you!

regards,

Tine

Clonebug
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Joined: Fri Feb 16, 2007 12:28 am

Re: Best base jetting Dellorto 40 DRLA - 1.6 engine

Post by Clonebug » Sun Oct 23, 2011 4:57 pm

Welcome to the forums,

The more info you can give about the engine and the car it is in the better chance you get or a reply.

Single or duals??

NA or turboed?

What exhaust do you have?

All this makes a difference....

What is the jetting in the carb or carbs right now.... You might be able to try it the way it is..

Clonebug

Tine
Posts: 5
Joined: Mon May 23, 2011 9:24 am

Re: Best base jetting Dellorto 40 DRLA - 1.6 engine

Post by Tine » Mon Oct 24, 2011 2:27 am

Hello,

It will be a dual setup, NA, Empi something exhaust. Just like this one:

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Oh, and intake trumpets, should it make any difference.

This is the car the engine is going into, a '74 1303:

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The engine in progress:

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fortyeye
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Location: Bump City South-Oceanside, Ca.

Re: Best base jetting Dellorto 40 DRLA - 1.6 engine

Post by fortyeye » Mon Oct 24, 2011 11:27 pm

To echo the previous post ... what jetting do you currently have in there?

Tine
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Joined: Mon May 23, 2011 9:24 am

Re: Best base jetting Dellorto 40 DRLA - 1.6 engine

Post by Tine » Tue Oct 25, 2011 2:24 am

135 mains, 205 air, .1 emulsions, 45 idles.

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fortyeye
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Location: Bump City South-Oceanside, Ca.

Re: Best base jetting Dellorto 40 DRLA - 1.6 engine

Post by fortyeye » Tue Oct 25, 2011 10:31 pm

Tine wrote:135 mains, 205 air, .1 emulsions, 45 idles.
Good start (what you have is a jumble) would be ... 115 mains, 200 airs, .2 emulsion tubes, 55 idles. Trouble will be finding the emulsion tubes (they're becoming rare). Looks like you've cleaned them up. Make sure you have your floats set correctly (ask if you need more info) and limit your fuel pressure to between 2.5 and 3.0 psi. Let us know if you need more info.

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