Tuning a 3310
#1176366
02/11/12 06:02 AM
02/11/12 06:02 AM
|
Joined: Oct 2003
Posts: 3,698
NE Oklahoma
Von
OP
master
|
OP
master
Joined: Oct 2003
Posts: 3,698
NE Oklahoma
|
Im gonna tackle tuning a 3310 with an O2 sensor....Need to get it as lean as it will allow at cruise
I plan on either drilling/tapping the PVCRs on the primary side or getting an aftermarket front block that is tuneable on the PVCRs...
But, Im not sure whether to get a tuneable rear metering block or use one of the plates like QF sells that allows jets to be used??
72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72.
Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.
|
|
|
Re: Tuning a 3310
[Re: Kevins493]
#1176369
02/11/12 03:46 PM
02/11/12 03:46 PM
|
Joined: Oct 2003
Posts: 3,698
NE Oklahoma
Von
OP
master
|
OP
master
Joined: Oct 2003
Posts: 3,698
NE Oklahoma
|
Quote:
Just get a jettable rear metering block. It turns out to be cheaper to tune in the long run since you already have a jet kit (for the front) and jets are A LOT cheaper than replaceable plates. 
Is there an advantage of a metering block over a jetable plate, such as this:http://www.quickfueltechnology.com/metering-blocks-and-parts/billet-metering-plate-kit-vacuum-secondary.html
72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72.
Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.
|
|
|
Re: Tuning a 3310
[Re: Von]
#1176370
02/11/12 04:37 PM
02/11/12 04:37 PM
|
Joined: Oct 2003
Posts: 7,506
Az
Crizila
master
|
master
Joined: Oct 2003
Posts: 7,506
Az
|
I don't think so. I went with the jet plate. Worked good. You might consider cutting off the choke housing and smoothing any sharp edges leading in to the venturi's. I did this and I believe it improved fuel distribution. Definitely improved flow ( good for about 1/2 a tenth with my set up). It's a great carb and easy to tune. Have fun!
Fastest 300
|
|
|
Re: Tuning a 3310
[Re: Von]
#1176371
02/11/12 11:33 PM
02/11/12 11:33 PM
|
Joined: Jan 2003
Posts: 12,046
Benton, IL.
DaveRS23
Special needs idiot
|
Special needs idiot
Joined: Jan 2003
Posts: 12,046
Benton, IL.
|
I have found that the secondaries are fairly close on the 3310. It might be prudent to wait and see how close the WOT is before you drop the coin for the secondary block. The primaries are another matter. The PVCRs are way small, which puts the mains way big. Depending on a lot of factors ( gearing, cam, intake, converter, weight, speed, etc, etc.) the carb may cruise on the idle circuit or on the main circuit. I would suggest that you drive the car with the O2 awhile and see what needs tweeked. I usually need to step down the mains 4 sizes or so and open the PVCRs an equivalent amount, then go to a much earlier opening PV to cover the more distinct transition from the mains to the PVCRs. Something in the 9.5 or 10.5 range. The WOT on the carbs are usually pretty close, it's the transitions that need the work. Don't forget to dial the ignition curve in. If this is a big block, I have had the best luck idling with as much advance as possible and then getting the rest of the advance in as quick as possible. I have used a lot of 3310s. They are the best bang-for-the-buck-carb out there. Oh, and don't forget the secondary spring kit to tune their opening point. And a quick change cover is nice, but not necessary.
Master, again and still
|
|
|
Re: Tuning a 3310
[Re: DaveRS23]
#1176372
02/12/12 04:28 PM
02/12/12 04:28 PM
|
Joined: Jan 2012
Posts: 47
Owasso OK USA
Cappy572
member
|
member
Joined: Jan 2012
Posts: 47
Owasso OK USA
|
I have a sec block for your 3310 you can have. I also have some ideas on how you can tune these carbs. Pm me and i will give you my number.
1970 AMX 572 twin turbo predator, 1970 Duster 572 B1, 1976 Gremlin 572, 1933 Plymouth coupe 340, Drag N Drive Events.
|
|
|
Re: Tuning a 3310
[Re: Von]
#1176373
02/12/12 06:50 PM
02/12/12 06:50 PM
|
Joined: Jun 2005
Posts: 793
Utah
topbrent
super stock
|
super stock
Joined: Jun 2005
Posts: 793
Utah
|
|
|
|
Re: Tuning a 3310
[Re: DaveRS23]
#1176374
02/12/12 10:12 PM
02/12/12 10:12 PM
|
Joined: Mar 2006
Posts: 9,831
MI, usa
dvw
master
|
master
Joined: Mar 2006
Posts: 9,831
MI, usa
|
Quote:
I have found that the secondaries are fairly close on the 3310. It might be prudent to wait and see how close the WOT is before you drop the coin for the secondary block.
The primaries are another matter. The PVCRs are way small, which puts the mains way big. Depending on a lot of factors ( gearing, cam, intake, converter, weight, speed, etc, etc.) the carb may cruise on the idle circuit or on the main circuit.
I would suggest that you drive the car with the O2 awhile and see what needs tweeked. I usually need to step down the mains 4 sizes or so and open the PVCRs an equivalent amount, then go to a much earlier opening PV to cover the more distinct transition from the mains to the PVCRs. Something in the 9.5 or 10.5 range.
The WOT on the carbs are usually pretty close, it's the transitions that need the work.
Don't forget to dial the ignition curve in. If this is a big block, I have had the best luck idling with as much advance as possible and then getting the rest of the advance in as quick as possible.
I have used a lot of 3310s. They are the best bang-for-the-buck-carb out there.
Oh, and don't forget the secondary spring kit to tune their opening point. And a quick change cover is nice, but not necessary.
I agree. Jet for power,then jet for cruise. Go back and drill the PVRC to make up the difference. I was able to lean the primary jets 4 sizes.
Doug
|
|
|
|
|
