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awesome carb idea |
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Nuggets ![]() Senior Member ![]() Joined: 07-November-2014 Location: UK Status: Offline Points: 869 |
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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
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Barnaby
429 powered 73 Stripper.....no comfort, just noise! |
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Richard W. ![]() New Member ![]() Joined: 25-December-2016 Location: Texas Status: Offline Points: 14 |
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Pushing raw fuel into the quench area thus fueling the plugs reducing efficiency. Once the plug is dead, enough fuel can build up to squeeze past the rings but most out the exhaust. It's still a hydraulic effect it just doesn't bend rods. These Thompson things should work fine for atomization, the Autolite 4100 has had one for its entire production run. If you have squirters that produce a flat stream, it's not needed.
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Richard W.
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Richard W. ![]() New Member ![]() Joined: 25-December-2016 Location: Texas Status: Offline Points: 14 |
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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 |
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Richard W.
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aquartlow ![]() Senior Member ![]() Joined: 19-December-2011 Location: Summerfield, Fl Status: Offline Points: 2221 |
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Hey California Johnny, looks like someone liked your avatar so much he made it his own
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www.supermotors.net/22468
Yeah, It's a Hybrid...It burns gas and tires. No matter how good she looks, somebody, somewhere, is tired of her sh*t. Beauty is skin deep, ugliness goes clear to the bone. |
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californiajohnny ![]() Moderator Group ![]() ![]() Joined: 05-October-2013 Location: winlock, wa Status: Offline Points: 14512 |
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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 |
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JOHN
74 GRAN TORINO S&H CLONE 74 VETTE CUSTOM 90 S10 BLAZER 4X4 LIFTED 77 CELICA CUSTOM 75 V8 MONZA SUPERCHARGED 79 COURIER VERT. SLAMMED 75 VEGA V6 5 SPD 70 CHEV C10 P/U 68 MUSTANG FB CONVERSION |
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aquartlow ![]() Senior Member ![]() Joined: 19-December-2011 Location: Summerfield, Fl Status: Offline Points: 2221 |
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Dang it Johnny, you took the high road once again. I was just stirring the pot a bit, nothing against the new member, just trying to liven the place up a bit
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www.supermotors.net/22468
Yeah, It's a Hybrid...It burns gas and tires. No matter how good she looks, somebody, somewhere, is tired of her sh*t. Beauty is skin deep, ugliness goes clear to the bone. |
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californiajohnny ![]() Moderator Group ![]() ![]() Joined: 05-October-2013 Location: winlock, wa Status: Offline Points: 14512 |
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JOHN
74 GRAN TORINO S&H CLONE 74 VETTE CUSTOM 90 S10 BLAZER 4X4 LIFTED 77 CELICA CUSTOM 75 V8 MONZA SUPERCHARGED 79 COURIER VERT. SLAMMED 75 VEGA V6 5 SPD 70 CHEV C10 P/U 68 MUSTANG FB CONVERSION |
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californiajohnny ![]() Moderator Group ![]() ![]() Joined: 05-October-2013 Location: winlock, wa Status: Offline Points: 14512 |
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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 ![]() |
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JOHN
74 GRAN TORINO S&H CLONE 74 VETTE CUSTOM 90 S10 BLAZER 4X4 LIFTED 77 CELICA CUSTOM 75 V8 MONZA SUPERCHARGED 79 COURIER VERT. SLAMMED 75 VEGA V6 5 SPD 70 CHEV C10 P/U 68 MUSTANG FB CONVERSION |
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MrSmog ![]() Senior Member ![]() Joined: 21-January-2016 Location: Ky Status: Offline Points: 1407 |
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maybe try a different accelerator pump cam? maybe one with a more aggressive ramp? |
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Nuggets ![]() Senior Member ![]() Joined: 07-November-2014 Location: UK Status: Offline Points: 869 |
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50cc pumps with yellow or brown cams are the way forward.....all the fuel.....all the time
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Barnaby
429 powered 73 Stripper.....no comfort, just noise! |
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Rockatansky ![]() Senior Member ![]() Joined: 30-July-2010 Location: On The Road Status: Offline Points: 5846 |
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what does the advance curve look like, possibly over-advancing at that point?
~supposedly~ George Holley said to Henry Ford that 90% of carb problems are electrical FWIW i just had to return my 2003 CVPI to stock for emissions, my X-cal II programmer allows me to advance above & beyond what the tuner put in, and i usually do ![]() mods include an Aviator throttle body (slightly larger), 2004 zip tube (better bends) Marauder filter box (larger inlet) and Marauder MAF (larger diameter). Haha it makes the 4bbl flipped air cleaner lid sound coming at you ![]() when i put it back to
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72 GT Ute
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Rockatansky ![]() Senior Member ![]() Joined: 30-July-2010 Location: On The Road Status: Offline Points: 5846 |
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introducing new architecture into the venturi air stream can cause significant to drastic changes in distribution characteristics. factory carbs (lots of well educated experimentation & development) have tiny little flags or tabs on the booster venturis for the purpose of controlling / modifying fuel distribution. you might think they're just left over casting flash from mfg'ing but they're there on purpose. here's a pic of some crazy big tabs, many are less that 1/8 square and are important enough to be there. notice that they're not symmetrical probably because the carb came on a dual plane intake plenum http://www.hotrod.com/articles/basics-restoring-carburetor-performance/#06-afb-carb-rebuild-tif
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72 GT Ute
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californiajohnny ![]() Moderator Group ![]() ![]() Joined: 05-October-2013 Location: winlock, wa Status: Offline Points: 14512 |
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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 ![]() |
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JOHN
74 GRAN TORINO S&H CLONE 74 VETTE CUSTOM 90 S10 BLAZER 4X4 LIFTED 77 CELICA CUSTOM 75 V8 MONZA SUPERCHARGED 79 COURIER VERT. SLAMMED 75 VEGA V6 5 SPD 70 CHEV C10 P/U 68 MUSTANG FB CONVERSION |
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