Slant Six Forum
https://www.slantsix.org/forum/

2/4-650cfm
https://www.slantsix.org/forum/viewtopic.php?t=14604		 Page 1 of 2
Author:  terrylittlejohn [ Mon Oct 03, 2005 3:12 pm ]
Post subject:  2/4-650cfm
what is the minium fuel pump flow to feed two 650 cfm double pumper?
Author:  Dennis Weaver [ Mon Oct 03, 2005 3:27 pm ]
Post subject: 
...depends on how much gas the motor is gonna suck outta them. What are they on?

D/W
Author:  terrylittlejohn [ Mon Oct 03, 2005 3:57 pm ]
Post subject:  2/4-650cfm
there on .080 over 225/ with 4-71 blower driven 1-1
Author:  Dennis Weaver [ Mon Oct 03, 2005 4:14 pm ]
Post subject: 
Damn, that's an oddball combination! :lol: Do you really think it can use all that carburetion, even with a huffer?

I've got no experience with blower motors. I can tell you that the good ole high-volume Carter mechanical pump fed my two AFB's on a 440 just fine.

D/W
Author:  terrylittlejohn [ Mon Oct 03, 2005 4:32 pm ]
Post subject:  2/4-650cfm
dont know if it to much carb,this is only being raced,the problem is the car is laying over just after i pull 3 gear, as i start lifting the engine starts pulling again, feels like fuel starvation. my pump is 5494 carter electic 72 gal/hrs,just wondering if there is a minium gal/hrs you should have.
Author:  Dennis Weaver [ Mon Oct 03, 2005 5:19 pm ]
Post subject: 
Sure sounds like it. Just out of curiosity, what size line are you running?

D/W
Author:  terrylittlejohn [ Mon Oct 03, 2005 5:48 pm ]
Post subject:  2/4-650cfm
3/8 copper all through with large fittingson bowls with duel inlets
Author:  emsvitil [ Mon Oct 03, 2005 8:02 pm ]
Post subject: 
Don't remember where, but I stumbled on a web site that had a calculator to figure it out................

It had something to do whith brake specific fuel consumption
Author:  Dart270 [ Tue Oct 04, 2005 6:39 am ]
Post subject: 
Terry,

72 gal/hr, or about 400 lbs/hr sounds like it should be plenty. What trap speeds do you get (or should get) in the 1/4 and what does your car weigh? You can support something like 600HP with that fuel flow.

650 carb is not too big for that setup, IMHO.

So, I don't think the fuel supply is the problem, assuming it's working properly. Seems like carb would be next to look at.

Lou
Author:  Dennis Weaver [ Tue Oct 04, 2005 7:17 am ]
Post subject: 
Quote:
650 carb is not too big for that setup, IMHO.
Lou, my understanding is that he's running two. :shock:

D/W
Author:  Dart270 [ Tue Oct 04, 2005 8:19 am ]
Post subject: 
Ah, that is a lot of carb. :shock:

I still think the pump should source plenty of fuel. I personally would not want to get two 650 carbs working on any Slant, but I'm sure it can be done. A single 650 is enough to get you into the 11s in a 2800lb car. Mike J is running high 11s with a single 600, NA on gasoline.

Lou
Author:  terrylittlejohn [ Tue Oct 04, 2005 3:10 pm ]
Post subject:  2/4-650cfm
hello agian had to work so missed your debate, this is a combination i settle because i had the parts. last year i ran a small blower on the same engine with a 750cfm and 5lbs of boost at 12.30ets/109mphs.this bigger 4-71 blower is running 12.20/93mph but thats is while i am lifting in 3rd gear ,if i stay in the throttle the full 1/4 the car slows and shows signs of detonation when you pull the plugs.
Author:  slantzilla [ Tue Oct 04, 2005 3:20 pm ]
Post subject: 
Car laying over in high and picking up when you let off is a classic sign of overcarburetion. :shock:
Author:  terrylittlejohn [ Tue Oct 04, 2005 3:26 pm ]
Post subject:  2/4-650cfm
thanks, so if i stay with 2-4 vac/secondary would be a better choice
Author:  Dart270 [ Tue Oct 04, 2005 3:36 pm ]
Post subject: 
It seems to me that your single 750 would be the best choice. A single 750 is good for at least 400HP and you are definitely not close to that range yet. 2 vac secondary carbs would work, but it seems overly complicated to me.

Lou
Page 1 of 2 All times are UTC-08:00
Powered by phpBB® Forum Software © phpBB Limited
https://www.phpbb.com/