awesome carb idea

the one thing regarding timing that i did see was if i cracked it real fast from idle while in park that the advance when about half way and started to retard, but if i opened it a bit slower it advanced and continued through the advance range as it should! the main reason i decided to try this carb was #1 it's been sitting there in the garage staring at me for years #2 i figured a bit bigger carb may work better than the 450 holley that was on there, would stall if you jumped on it hard from an idle--it's a design flaw the advance hole is below the butterfly on those 450 mechanical 4 bbl's i've plugged and redrilled them above the butterfly--holley states not to use those particular carbs as a single carb, i'm guessing it has something to due with vacuum issues of a dual 4 tunnel ram????

 but that "flat spot" as i called it was almost unnoticeable to me, the average person probably never would have noticed it at all!!

 it runs well enough for my purposes  

what does the advance curve look like, possibly over-advancing at that point?

californiajohnny wrote: ok, today the weather was decent enough to road test and tune the carb today  i did 4 or 5 runs out on the open road with the 600 DP seems good... i did notice a very slight flat spot at less than 1/4 throttle very very minor!  so then i installed this powerblast plate and retried it 4 or 5 times again... it did seem to have a little smoother transition now!  is it worth the $40??? IDK but what the hell i've spent money on other parts over the years that either didn't work out or never got used or scrapped or traded or sold

maybe try a different accelerator pump cam? maybe one with a more aggressive ramp?

... "water on a duck's back"

yeah i noticed that! well as they say if your good it's often imitated



 now i remember the term... "imitation is the most sincere form of flattery"


Edited by californiajohnny - 25-February-2017 at 1:29PM

Here is a video in action. See how the stream fans out, better atomization. However, you do have to bend them as its running to make sure none of the fuel hits the side of the venturi. This could slow down airflow ruining any positive effects.





https://youtu.be/-tAZjyu_KKY

In order to hydraulic lock the engine with the carb jetting you'd have to be an idiot.....like running a 1050 Dominator on a stock 289

The squirters output is just determined by how hard you mash the pedal and force the diaphragm up with the cam....you can get some pull past but Holley make a nozzle to stop that 

They are designed to have negative pressure above the squirter so it meters correctly. The Autolite 4100 4bbl come stock with them for a reason. My advise, get a 4100 and call it good. You will search for and chase the throttle response this carb will give all day. Are they expensive, yes but the last one I bought last month I paid $75 on Ebay. With rebuild kit, bushings, filter, new needles, base plate and base gaskets, I will have about $200 all in. The one I have on my 74 Gran Torino 351w (393 stroker) 600 cfm gets about 12-13 mpg in town and 16-19 highway depending on how I drive. How you drive is 50% of your mpg. On one froggy day I got 7mpg. Sue me, I was having fun! 😃

Edited by Richard W. - 21-February-2017 at 7:41PM

Big Bird wrote: I could swear I've seen those squirter diverters before, like 20-30 years ago.

Same here. I recall seeing products like this hyped for the performance crowd, then after people figure out it was all hype the products just faded away. The ones I recall were some sort of magnetized wire (touted as improving MPG too), and another was a screen.

I'd be interested in how this does not interfere with the bernoulli affect, a diverter plate like this seems like it would impede  a high performance carbs overall CFM.

haven't tried it yet, been waiting on that 600DP base plate for that carb i want to try it on aftermarket base plate was on back order for the last 2 months so i called summit a couple of days ago and asked if they had the factory holley one in stock since it was only $8 more they said yes and since i've been waiting so long they would just send it to me and not pay the difference just got it today! should have been here yesterday but fedex pussed out and wouldn't deliver yesterday because of the snowy roads...roads were bare and dry BTW!! so i just got it but i may not swap carbs just yet since i need to drive it down and get it realigned, just thinking don't want to be messing around on the side of the road with an untried carb! probably just paranoid but don't like taking nice cars out in crappy weather and have possible issues on top of that

Nuggets wrote: I keep seeing these advertised on facebook....the price puts me off trying one, I'm just running a far more aggressive cam on my carb, bigger squirter sizes (37-42) and twin 50cc pumps. Definitely didn't stumble when I broke the engine.....

Edited by aquartlow - 07-February-2017 at 9:25AM

Soooooo, has anyone tried it yet?

J

A better atomization tool closer to the squirters... sounds like a good deal to me!

californiajohnny wrote: well i may be a while before i find out, i bought one to try on the primary side... i'm planning on swapping out the 450 holley for a 600 doublepumper i have, but the base plate is on back order i've had it for several years almost new carb with a fresh rebuild kit in it that i did for a buddy, he broke a tab installing it, so i bought it from him cheap!!! been laying around for many years so i figured i'd use it for my future "last car" when i get it (69 GTO judge) but i also thought about a 67 fastback mustang for a "last car" then i figured hell why not get both! but as of late i'm thinking just a 67 fastback.  damn you ford guys...you've corrupted me!!