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Re: 5.74 MPG help!!!!
[Re: 70rrclone]
#963365
03/31/11 10:39 PM
03/31/11 10:39 PM
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Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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600 Eddy 1405 & if a 1406 (elec choke) will need to mod the pulloff & slow the elec choke activation. Had one on a 440 C boat & plenty of power. I would mod your dist initial/total/springs/vac adv IN ORDER & consider (re)working the worst system which is the single ex and adv the cam 4 deg EDIT reread that you already have headers. A/F ratio??
Last edited by RapidRobert; 03/31/11 10:50 PM.
live every 24 hour block of time like it's your last day on earth
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Re: 5.74 MPG help!!!!
[Re: 70rrclone]
#963368
03/31/11 11:40 PM
03/31/11 11:40 PM
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Joined: Oct 2010
Posts: 606
Montana
Yancy Derringer
mopar
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mopar
Joined: Oct 2010
Posts: 606
Montana
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Quote:
why would this combo get 5.74MPG.
3310 holley. ........... every other day i have to adjust the mixture screws .............. the carb is over 20 yrs old ............. does seem to run very rich
Is this a joke?
There is a REASON why just about every manufacturer went to a "spreadbore" 4bbl design. Thermouqd, Quadrajet, whatever that Autolite thing was called, it was all the same strategy
SMALL front barrels and BIG secondary barrels.
Additionally, what are you running for timing, have you checked that the advance mechanism in the distributor is working right, and how far does it advance? Have you checked the vacuum advance? How hot does the engine run?
What condition is the engine, mileage, compression? What is the chances that the timing chain / sprockets (they are not "gears") is darn near worn, or that it needs a valve job or worse?
DO NOT rebuild the 3310, SELL it for whatever you can get and either buy a much smaller carb or get a Thermoquad/ Quadrajet
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Re: 5.74 MPG help!!!!
[Re: RapidRobert]
#963370
03/31/11 11:59 PM
03/31/11 11:59 PM
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Joined: Jul 2008
Posts: 30,547
Florida STAYcation
dOc !
The village idiot's idiot
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The village idiot's idiot
Joined: Jul 2008
Posts: 30,547
Florida STAYcation
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Quote:
(1) Doc whats that? (2) Correct, a Demonsizzler prepped TQ would b the way to go
RR .... that ? And there is no need on a basic cruiser combo this guy has to have to spend huge $$$ on a rebuild. ALL that is really needed is a good FSM to do the job. Now IF he choses the hi$$ rebuilder route ... say with DS ... I would hope he would put the vent tubes IN the carb top .. 
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Re: 5.74 MPG help!!!!
[Re: dOc !]
#963371
04/01/11 12:02 AM
04/01/11 12:02 AM
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Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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Alright I gotcha, Yeah k.i.s.s. & noboody's rich these days
live every 24 hour block of time like it's your last day on earth
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Re: 5.74 MPG help!!!!
[Re: 70rrclone]
#963375
04/01/11 12:56 AM
04/01/11 12:56 AM
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Joined: Jun 2004
Posts: 3,319
Chicago Burbs
sthemi
master
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master
Joined: Jun 2004
Posts: 3,319
Chicago Burbs
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Carb too big, try a 600-650 Edelbrock or Holley, with vacuum secondarys. Also Motorhome engines do not have enough compression to be effecient, you will need to put some smaller chamber heads, mill the ones you have or put some higher compression pistons in the motor. 
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Re: 5.74 MPG help!!!!
[Re: RapidRobert]
#963377
04/01/11 03:14 AM
04/01/11 03:14 AM
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Joined: Oct 2010
Posts: 606
Montana
Yancy Derringer
mopar
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mopar
Joined: Oct 2010
Posts: 606
Montana
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Quote:
Yancy b nice he's just asking for help w it
I was b' nice, and you'll notice I gave him some suggestions.
Someone else suggested checking for leaks. EXCELLENT Take a really good look, stuff like your filler cap, get out IMMEDIATELY after shutdown, do you smell gas anywhere?
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Re: 5.74 MPG help!!!!
[Re: dOc !]
#963379
04/01/11 09:11 AM
04/01/11 09:11 AM
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Joined: Jan 2003
Posts: 21,091
Niles , Ohio
therocks
oh wait.but hey.lets see.oh yeah.
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oh wait.but hey.lets see.oh yeah.
Joined: Jan 2003
Posts: 21,091
Niles , Ohio
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I thought my 65 was bad at 5 mpg.I run 440 12.5 domes .588 cam and 1050 Dominator with 3.91s.When I was running the smaller parts and a 850 double pumper I was getting about 11 mpg.Rocky
Chrysler Firepower
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Re: 5.74 MPG help!!!!
[Re: Mopar_Country]
#963381
04/01/11 10:03 AM
04/01/11 10:03 AM
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Joined: Jan 2003
Posts: 826
Stone Mt, GA.
DEMONSIZZLER
super gas
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super gas
Joined: Jan 2003
Posts: 826
Stone Mt, GA.
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Quote:
Quote:
Quote:
just another PIG-FAT Berri crab issue ... 
Get a good TQ and proper intake .... and you could probably TRIPLE that mpg ! 
(1) Doc whats that? (2) Correct, a Demonsizzler prepped TQ would b the way to go
Demonsizzler isn't doing the carbs anymore.
https://board.moparts.org/ubbthreads/showflat.php?Cat=0&Number=6545901&an=0&page=0
I was taking a break from carb work; my allergies have been so bad!
As for 'removal' of the vent stacks, I have been doing this for 25 yrs and it does work. If you run a drop-base air cleaner, it is necessary on T.Q.'S to shorten the stack if not remove it. Several carb builders remove the vent stack also. On a T.Q., it works well as there is little or no chance the gas can flow out of the vent due to a well designed vent system coming off the float chambers.
Example pic:
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