Performance Mods – Racing beat intake, dellorto carb – Hey guys, Just joined But anyway I was in the junkyard the other day and spotted an rx7 with a. I picked-up a used Racing Beat Dellorto (12A) carburetor this summer and convinced myself I had one on my car (83 12A RX-7) for a couple years in the past. 21 Responses to “How to: Rebuild Dellorto Sidedrafts” . I using 48 Dellorto on Mazda RX7!3B engine. rebuilt carb last summer, worked fine except millage.

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The pump jet “washer” is an extremely critical part, as Dave has explained. I used a stock Mazda intake manifold gasket and Mazda O-rings. Ddellorto just got hooked up with a guy in AZ that is setting up to be a “distributor” of Dellorto stuff, so getting parts doesn’t need to be done through AUS, or Itally now.

Weber parts are going to be 10 times easier to find because dellortos arent being made anymore. We have tripod cats 3-legged We have blind cats We have one-eyed cats We have had a diabetic cats We have a cat with mega-esophagus Meaning we have cats needing various continued care.

Thanked 1 Time in 1 Ddellorto. Maybe a little too loud. I hope you are using one! When inserted into the body, that slot lines up with the fuel supply hole for lack of a better term. Fit the new valves and assemble the float rellorto cover with gasket!

First we need to understand there are 3 types of float. If you are adjusting the idle for a set of carbs already fitted then progress to the dellroto stage.

Racing beat intake, dellorto carb

They are the ulimate in tuneablity, they are also as a downside extremely hard to tune without a massive jet box or rolling road, cause they need to be bang on the money. Find More Posts by Snapshot. It was faster than a RB 13B stock port with the downdraft version. The 2 vent is just like a 1 with tiny bit smaller bore size to the signal tube, so they have fitted.


As far as I’ve been able to tell, this happens no matter how properly the throttle pump is adjusted. The exploded diagram was very useful while doing this We rellorto a participant deplorto the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon. A good example would be the origional webers had brass floats but the dellorto used poly urithane floats The current weber carb uses poly urithane floats, and has been improved alot so the dellorto doesnt really have much of an advantage.

RB 13B Dellortos are available out there, and I would recommend using one of them rather than re-jetting the 12A units. Really allows the enlarged engine ports to flow.

How to set Floats. I also decided to replace every gasket the kit was sold to me with most replacement gaskets.

How do the 3 stack up? Will did considerable tinkering with the carburetor to ddellorto the original RB xellorto. What would be good for this type of application? This is definitely one part that you should not remove or loosen unless you have to, and you have new parts for a rebuild. During this procedure, the idle speed may become unacceptably high, so re-adjust it and repeat the procedure for each carb barrel.

Early Rotary & 1979-85 Mazda RX-7

If it only does this at temp, it also sounds like it could be a choke problem. If this happens when the engine is warm and you know that the timing is OK, then the mixture will need trimming richer on that cylinder. This is, without a doubt, the best aspect of the Dellorto Find More Posts by DriveFast7. I was glad to have rescued it from the crusher but now I don’t know what to do with it, i was thinking of throwing it on ebay but im not sure wjat this stuff is worth. I had to make a few gaskets At times this is beneficial, but in certain situations this can become downright annoying.


There love keeps us going. It is true that the fuel consumed at idle is drawn through the idle jet, but the idle mixture is metered not by these jets, but by the idle volume screws mounted on top of each barrel.

The throttle cable housing bolts right up to the bracket. Racing Beat recommends float levels of 15mm from the gasket in the closed position and 28mm in the wide-open position.

The Holders have vertical marks on them which I assume are supposed to mark the location of the hole. However a 40 DHLA will accommodate a 36mm choke, so if funds are limited and the engine is not going to be tuned further then delporto DHLAs will do the job. The throttle opened up dwllorto allowed a large amount of air to flow into the engine but there was no fuel coming out of the Pump Jets.

This page is a write-up by Will rz7 his experience getting the Dellorto working on a stock 12A. This is pure magic they are automatically calibrated, you simply keep the idle jet above 59 up to 62 and not make the mistake of fitting numbers suited to the early DHLA or DCOE – with this simple technique you can tune anything from a delporto a cc without really doing anything.

Racing beat intake, dellorto carb – NoPistons -Mazda Rx7 & Rx8 Rotary Forum

The installation was easy but awkward. Below is a small chart showing the most commonly used air size designations, running from weak to rich.

I removed one of the Pump Jets and hit the throttle.

The float height is checked, the right heights were contained with the kits. For any questions or comments, I can be reached at rxcetera hotmail.