Keep Dellorto DRLA 45s and Bosch 009? Options

[98101]

I suddenly find myself owning 1970 4-cylinder 2.4 with Web hot street Cam idles nicely and pulls hard at WOT. Part throttle response is not great, often with carbs coughing and even backfiring on trailing throttle. My use is mostly street, so I'd like to get this part throttle stuff sorted.

Here's pictures of the stuff that's in there now. I guess that's the infamous Bosch 009 with no vacuum advance and a PerTronix 1847A. The carbs are Dellorto DRLA 45s with short velocity stacks and these tall foam things that don't seal against the air cleaner housings. I'm willing to learn about the carbs but I don't have much confidence in the 009 for running nicely on the street. Please correct me if I'm wrong about any of this stuff.

Also from other threads I gather that switching to EFI such as MicroSquirt would cost $5K or so ... though I'm not ruling this out completely. Correct me if I'm wrong about that.






Is this kind of linkage OK?


Here's the idle you may have seen in another post:

https://www.youtube.com/watch?v=-AC53RRrXOU


Any help you can provide is appreciated!

--Michael in Seattle

[MarkV]

I have a 2056 with Dellorto 40's. My car came with a 050 distributor which is supposed to be better suited to a 914 that the 009. I played around with the 050 trying to get is set up to work right in my car.... installed a Pertronix and a different coil. Tried running a CDI box. Had a flat spot just off of idle that I couldn't ever get rid of. Bought a $75 used dual point Mallory and converted it to a Pertronix II. The Mallory is way superior to the Bosch 050. The bushing/bearings are larger, the distance between the plug wires is further apart and work better and aren't as prone to spark scatter. The advance mechanism is easily user adjustable. I did not have to modify the tin or the oil sender in any way. The Mallory is the way to go if you ask me it made a huge drive-ability difference.

From my perspective you can't really pay some one to set up Dellortos for you because of the trial and error involved. You have to learn how they work and how to adjust them. I rebuilt mine and change the vents size & jet size and got them working really well. Once they are set up they don't require much in the way of adjustment. Make sure the cross-bar linkage is set up properly and the carbs are both opening at the same rate.

[98101]

Bought a $75 used dual point Mallory and converted it to a Pertronix II.

Do you remember which model Mallory it was? I’m guessing the dual point feature doesn’t matter for the PerTronix II, but my guesses seem to be wrong half the time.

Mark, where do you get your jets and air filters for your Dells? Someone can tell me if I’m wrong, but I can’t see how the foam wraps my car’s previous owner was using would stop much of anything.