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

[HarveyH]

Once upon a time long, long ago in a galaxy far, far away (pre-internet) I was researching recommendations for a jetting for Weber 40 IDF's on a 2056 with a hot cam. I called several Weber suppliers, and they all recommended major upgrades to the ignition system as a starting point. This included a multi-spark box, upgraded coil and a point replacement system. I went with the Crane Hi-6 and PS-91 coil and a Pertronix and it made a major improvement in driveability.

As time went by, the internet came along and I found out the 009 distributor the Previous Owner installed was nor really suitable for Ty4 engine. The Mallory was recommended, but the original equipment Bosch would be vastly superior to the 009. Since the PO had included the original distributor with the car, I reinstalled that and again found a significant improvement in driveability.

Harvey

[98101]

I found what might be the linkage Mark's recommending?
http://www.mamotorworks.com/VW/product/car...engine-325064-4
It says for IDFs... also suitable for DRLAs?

But I'm guessing that there's not much point in tinkering with the carbs until a more appropriate distributor is installed -- is that correct?

Sorry for a possibly dumb question: I'm actually not 100.0% sure that's a Bosch 009. I assumed that it was because I googled the number on the rotor "1234332215 .08" and it was associated with the 009. Do I definitely have a 009 now?


Another view showing the PerTronix 1847A position sensor. I guess I'd need to move that oil pressure sender if I installed a Mallory?


I'm reading about the Mallory distributor now. I found some old posts where Jake Raby is recommending the non-vacuum advance models because those mechanisms are hard to tune and unreliable. So that's interesting.

A previous owner installed the PerTronix Flame Thrower coil in 2010 along with the breakerless ignition.

The previous owner provided Bob Tomlinson's 1995 "The Dellorto Superformance" book.

The foam things don't look like they're sealing well. I haven't found air filters that would fit online yet. I'm curious why the current air cleaners are so much taller than the velocity stacks... maybe someone was thinking about top end only?