Slant *        6        Forum
Home Home Home
The Place to Go for Slant Six Info!
Click here to help support the Slant Six Forum!
It is currently Sat Nov 09, 2024 8:33 am

All times are UTC-08:00




Post new topic  Reply to topic  [ 5 posts ] 
Author Message
PostPosted: Mon Oct 07, 2024 6:52 pm 
Offline
2 BBL ''SuperSix''

Joined: Fri Sep 15, 2023 5:07 am
Posts: 15
Car Model: 1965 Dodge Polara
Hi there. I have one of those clone super-6 carbs, but I'm using it on a 318. The carb has, by my count, 8 ports of various sizes, although I'm only using 3 of them (PCV, distributor, choke).

There is one port that comes off the back side of the throttle plate, a small port about the same size as the distributor or choke port. I use it to make manifold vacuum measurements but otherwise it's capped. But I've noticed that when running at warm/hot idle if uncapped the RPM's go up a little. I've also noticed during cold starts that if uncapped the engine runs a LOT better / faster. Some say this port goes to the warm air control valve on the air cleaner housing, so it's not really meant to flow air. But I'm thinking of leaving it open, maybe plumb it to -

plumb it to the single small port I have on the underside of my air cleaner. This port is a mystery. My air cleaner has no valve mechanism of any sort, but it does have a SINGLE port (nipple) on the underside, I seem to recall that it was connected to *some* port on the car's orignal BBD (circa 1967, this was a poly 318 originally).

So this is basically 2 questions. Is it possible that this Super-Six clone is supposed to have a small throttle-body port that is supposed to flow air, and where would the small port on the air cleaner connect to on a 1967 BBD?


Top
   
PostPosted: Mon Oct 07, 2024 9:55 pm 
Offline
Board Sponsor & Contributor

Joined: Thu Oct 31, 2002 5:39 pm
Posts: 24417
Location: North America
Car Model:
Quote:
Hi there. I have one of those clone super-6 carbs, but I'm using it on a 318.
I've not seen a copycat Super-6 carb, only copycat V8 carbs. Want to show us what you got? Link/pics.
Quote:
There is one port that comes off the back side of the throttle plate, a small port about the same size as the distributor or choke port. I use it to make manifold vacuum measurements but otherwise it's capped.
Thermostatic air cleaner vacuum feed, assuming "back side of throttle plate" means under rather than over the plate when it's closed.
Quote:
I've noticed that when running at warm/hot idle if uncapped the RPM's go up a little
Because you've created a vacuum leak.
Quote:
I've also noticed during cold starts that if uncapped the engine runs a LOT better / faster.
Because your choke pull-off link is in need of adjustment (close the legs of the U-bend to make it pull the choke open more).
Quote:
I'm thinking of leaving it open
No. We don't leave ports open to the (dirty) air.
Quote:
maybe plumb it to the single small port I have on the underside of my air cleaner
No. But show us pics of this air cleaner port, please.
Quote:
Is it possible that this Super-Six clone is supposed to have a small throttle-body port that is supposed to flow air
No.

_________________
一期一会
Too many people who were born on third base actually believe they've hit a triple.

Image


Top
   
PostPosted: Tue Oct 08, 2024 5:47 am 
Offline
2 BBL ''SuperSix''

Joined: Fri Sep 15, 2023 5:07 am
Posts: 15
Car Model: 1965 Dodge Polara
Here is a pic of the carb:
Attachment:
140.JPG
140.JPG [ 96.49 KiB | Viewed 1144 times ]
Here are some views showing the ports:
Attachment:
dromodary-bbd..jpg
dromodary-bbd..jpg [ 65.1 KiB | Viewed 1144 times ]
Port 4 is the one where if it's open, the warm idle goes up a little, and when cold starting the engine runs much faster right off the bat. I'll connect a vacuum guage to this port to measure manifold vacuum. I'm currently getting 18 or maybe 20 inches at warm/hot idle, timing is 10 BTDC. I must say that turning mixture screws don't seem to have much effect at idle, I'm not finding a setting that gives a sharply-defined smooth running and peak vacuum like I remember from years ago when adjusting other BBD and the BBS on my slant-6.

Here is the bottom of the air cleaner:
Attachment:
693.jpg
693.jpg [ 92.42 KiB | Viewed 1143 times ]
Close-up:
Attachment:
694.jpg
694.jpg [ 47.01 KiB | Viewed 1143 times ]


Top
   
PostPosted: Wed Oct 09, 2024 10:44 am 
Offline
Board Sponsor & Contributor

Joined: Thu Oct 31, 2002 5:39 pm
Posts: 24417
Location: North America
Car Model:
That's a copycat version of a '77-up "solid fuel" BBD. Can't see the telltale choke lever configuration because there's no pic from a suitable angle, but looks like probably a copycat 318 carb; where does the idea come from that this is a Super Six carb clone?

Port 8: venturi vacuum tap for EGR, not used in your application; cap it.
Port 7: fuel inlet
Port 6: bowl vent
Port 5: distributor vacuum advance (probably; can't 100% tell from this angle)
Port 4: manifold vacuum to thermostatic air cleaner, not used in your application; cap it.
Port 3: canister purge inlet, not used in your application; cap it.
Port 2: choke pull-off
Port 1: PCV inlet

Nipple on underside of air cleaner means you have an unusual air cleaner, configured for use with a heat-tube type automatic choke or a throttle anti-ice system. Not used in your application; cap it.
Quote:
timing is 10 BTDC.
Bit much, back off to 5°.
Quote:
turning mixture screws don't seem to have much effect at idle, I'm not finding a setting that gives a sharply-defined smooth running and peak vacuum like I remember from years ago when adjusting other BBD and the BBS on my slant-6.
This might change once your initial timing and idle speed settings are corrected and unused ports are properly capped.

_________________
一期一会
Too many people who were born on third base actually believe they've hit a triple.

Image


Top
   
PostPosted: Wed Oct 09, 2024 4:44 pm 
Offline
2 BBL ''SuperSix''

Joined: Fri Sep 15, 2023 5:07 am
Posts: 15
Car Model: 1965 Dodge Polara
Port 7 is another vacuum line under the fuel inlet. A bit hard to see in one pic.

I'm not changing my timing. If I get great stable low-speed idle and great vacuum at 10 BTC on 87 octane ethanlol junk then it's staying at 10.

These engines waste so much gas when idling, the slower the idle the better.

Current state of mixture screw "unresponsiveness" is with all ports capped as recommended, PCV is connected, bowl vent is open, and with timing set at various between 0 to 10 BTDC.

I'm considering buying an air-fuel ratio guage, which involves mounting an oxygen sensor in the exhaust pipe. There is one on amazon described as "30-0300 Wideband UGEO Air Fuel Ratio Gauge 52mm(2-1/16"), AFR/Lambda Controller Kit with LSU 4.9 Sensor" for $170 CAD, seems highly recommended.
Attachment:
2146.jpg
2146.jpg [ 227.3 KiB | Viewed 1088 times ]
Attachment:
144.JPG
144.JPG [ 143.54 KiB | Viewed 1086 times ]
Attachment:
61T3.jpg
61T3.jpg [ 75.6 KiB | Viewed 1088 times ]
Attachment:
idle-bypass-assist.JPG
idle-bypass-assist.JPG [ 75.27 KiB | Viewed 1082 times ]


Top
   
Display posts from previous:  Sort by  
Post new topic  Reply to topic  [ 5 posts ] 

All times are UTC-08:00


Who is online

Users browsing this forum: No registered users and 5 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Limited