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

[thelogo]

I assumed when you test drove the car it was running strong

But you have to remember a big 4 is not going to run like a
Toyota camry

Its a carbed , 91 octane , with headers brute . Abrasive and snorting burbbling monster


So minor adjustments aside it should run more like a race /track car then a street or cruiser

My 2.3 has webbers it runs smooth at all
Rpm but everything was dialed in at a shop
Its close to perfect

[98101]

Its a carbed , 91 octane , with headers brute . Abrasive and snorting burbbling monster

It’s the backfires that bother me the most, thinking that too many of them might cause damage. But yeah, I’m not expecting it to be as inoffensive as my Miata.

[GregAmy]

Its a carbed , 91 octane , with headers brute . Abrasive and snorting burbbling monster

It’s the backfires that bother me the most, thinking that too many of them might cause damage. But yeah, I’m not expecting it to be as inoffensive as my Miata.

It's quite possible - likely - that your idle circuits are plugged or dirty. "Ask me how I know".

+1 on the CB Performance bible, snail-style airflow gauge, and learning about them yourself. The book can be a bit disjointed at times - for example, some pages are out of order...he really should have had someone edit it for him - but it's fantastic information.

While you're placing that order, go ahead and order a couple gasket/rebuild kits. You'll potentially arrive at what I did, and that's spend an afternoon rebuilding/cleaning carbs.

<---- 40s on the race car now a big Del fan...though I really like the stock fuel injection on the stock 2L street car...