Edelbrock Tech. support, interesting reply
Thread Starter
Drifting
Joined: Jun 2001
Posts: 1,809
Likes: 0
Edelbrock Tech. support, interesting reply
I e-mailed the tech support about my sec. kicking in;
My e-mail;
My engine should make between 375 and 420 hp. The cam is at 222 @ 50 with a 470 lift. and running the 1406 carb. The sec. seems to kick in around 2800 rpm, and kicks in very soft.
My question is I have a high revving motor and really want the sec. to kick
in hard and dump lots of fuel above 3000, what setting do you recommend for jets and rod.
I was running a Holly 650 dp with mech. sec. and it was great above 3000 but
dumped too much fuel at the lower RPM and the Edel. 1406 is great at the low
RPM. Please advise. thanks in advance.
Edelbrock response;
well, how does it run with the stock jetting and what do the plugs look like
after a full throttle hit? this will tell me a lot, sometimes bigger isn't
always better. Also, we can not recommend this because we haven't done any
long term testing with it, but I have seen some guys remove the secondary
air valve from the carb and it allows the secondaries to get air a lot
quicker.
My e-mail;
My engine should make between 375 and 420 hp. The cam is at 222 @ 50 with a 470 lift. and running the 1406 carb. The sec. seems to kick in around 2800 rpm, and kicks in very soft.
My question is I have a high revving motor and really want the sec. to kick
in hard and dump lots of fuel above 3000, what setting do you recommend for jets and rod.
I was running a Holly 650 dp with mech. sec. and it was great above 3000 but
dumped too much fuel at the lower RPM and the Edel. 1406 is great at the low
RPM. Please advise. thanks in advance.
Edelbrock response;
well, how does it run with the stock jetting and what do the plugs look like
after a full throttle hit? this will tell me a lot, sometimes bigger isn't
always better. Also, we can not recommend this because we haven't done any
long term testing with it, but I have seen some guys remove the secondary
air valve from the carb and it allows the secondaries to get air a lot
quicker.
Melting Slicks
Joined: Aug 2001
Posts: 2,043
Likes: 1
From: Elkhorn WI
Re: Edelbrock Tech. support, interesting reply (Alwyn678)
interesting thought...let us know how it works out for ya...
if it does what I am thinking, this might make for a great conversion of the 600 cfm
it might make the carb function as a carb to a 2 barrel gas economy, 4 barrel's a screaming ....
let us know.
if it does what I am thinking, this might make for a great conversion of the 600 cfm
it might make the carb function as a carb to a 2 barrel gas economy, 4 barrel's a screaming ....
let us know.
Drifting
Joined: Nov 2000
Posts: 1,361
Likes: 0
From: Honolulu Hawaii
Re: Edelbrock Tech. support, interesting reply (Alwyn678)
Give it a shot and see what happens..You can always replace it
I cannot being to understand how an Edelbrock Tech would even allude to doing this. So maybe this is where Maurice got the idea to do this. He did it with expected results. POOR PERFORMANCE. That carb does not have the ability to richen up enough when the secondaries open without the air valve. No power valve circuit or accelerator pump on the secondaries. What you'll get is a real bad case of lean bog.
Race Director
Joined: Apr 1999
Posts: 11,520
Likes: 13
From: CORVETTE 77 385 C.I. TEXAS
Re: Edelbrock Tech. support, interesting reply (nunus79)
E-mail GKull. George has exp. w/ the Edel. Carter. Here's a guess - you could jet up to #1405 specs., esp. the sec. - have never run that carb or seen this posted. :eek:
Safety Car
Joined: Jan 2001
Posts: 3,569
Likes: 1
From: Hawaii
Re: Edelbrock Tech. support, interesting reply (Tominator)
I have seen some guys remove the secondary
air valve from the carb and it allows the secondaries to get air a lot
quicker.
air valve from the carb and it allows the secondaries to get air a lot
quicker.
Burning Brakes
Joined: Dec 1999
Posts: 845
Likes: 0
From: Ventura Harbor CA California
Re: Edelbrock Tech. support, interesting reply (Tominator)
You need to forward that back to Edelbrock and ask for a phone call from a manager.That said, the secondaries on the EB are mechanical. The air valve opens after (while) the bottom butterflies open and fuel is being drawn. Check on the right rear of the carb to see if the secondary butterflies, not the air valve, are opening all the way with the pedal. The tang should hit the stop. If that checks out, the transition to open the secodaries, is in the primary circuit. Step up springs and rods to dump enough fuel so the vacuum through the secondary butterflies off sets the weights on the air valve. With that kind of HP, I would suggest plain springs and maybe a little stretch. The accelerator pump needs to be in the first hole, Farthest away from carb. If you need to change rods and jets. the rod numbers are cruise/power smaller #= richer. Jet numbers, larger #= richer.
Le Mans Master
Joined: Feb 1999
Posts: 6,807
Likes: 0
From: Hoosier
Cruise-In III Veteran
Re: Edelbrock Tech. support, interesting reply (7Bob3)
That air valve opens under change of engine vacuum...that's what makes it a vacuum operated secondary carb. Also the secondaries start to open at about 1/2 to 2/3 full open of the primaries. The air valve doesn't let gas flow at lower high vacuum cruise for gas mileage. Best bet to is make double sure the secondary throtle plates are openning fully. When I first got mine they weren't. I had to adjust a tang.
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Thread Starter
Drifting
Joined: Jun 2001
Posts: 1,809
Likes: 0
Re: Edelbrock Tech. support, interesting reply (Maurice)
Thanks every one for their replies, unfortunaly I live in Iowa and there has not been any nice days for me to take it out of the garage to test :rolleyes:. I'm currently reading and rereading info about the Edelbrock carb. so that I can adjust it acordingly :sleep:.
Went to Autozone to look at adjustment kits for it, and the one for 1406 didn't have very big jets with it. The cost was $35.00, the kit for the 1405 had bigger jets and was $55.00 :eek:. Going to do some more reading to see if I should just get the jets (much cheaper) or if the kit (different jets springs, etc.) will help the best.
[Modified by Tominator, 8:34 AM 1/22/2002]
Went to Autozone to look at adjustment kits for it, and the one for 1406 didn't have very big jets with it. The cost was $35.00, the kit for the 1405 had bigger jets and was $55.00 :eek:. Going to do some more reading to see if I should just get the jets (much cheaper) or if the kit (different jets springs, etc.) will help the best.
[Modified by Tominator, 8:34 AM 1/22/2002]
