Pump cams on 1050 3 circuit domi
#225846
02/15/09 04:20 PM
02/15/09 04:20 PM
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Joined: Dec 2008
Posts: 1,200 UK
602heavy
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Anyone had problems with these cams (buff colour) , just seems to pour the fuel through the shooters , this carb is out the box & runs wayyyyyyyyyyy rich between 1500rpm & upwards , heard theres some tuning issues with these 3 circuit carbs but the motor is flooded with fuel through the rpm range , changed carbs & the motor runs sweet , this motor is a 605" , will change the cams & see what happens , what does'nt help is the throttle linkage is a 1:1 ratio , so when you open the throttle both primary & sec shooters are activated@ the same time. If the motor was a 440" i could understand it not working out the box , but this is a 605" so would think the volume/duration of shooter would be near the mark. I've got two other 1050 2 circuit dominators that run fine on the 605" , the volume/duration of fuel out the shooters does'nt even come close to the 3 circuit , just thinking what motor would require that ammout of fuel out the shooters to perform ok. TIA
Last edited by 602heavy; 02/15/09 04:32 PM.
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Re: Pump cams on 1050 3 circuit domi
[Re: 602heavy]
#225849
02/15/09 04:51 PM
02/15/09 04:51 PM
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Joined: Jun 2004
Posts: 1,217 Wellington, FL
cudabunch
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Quote:
Sorry , modded my post.
The pump shooter cams are yellow , just wondering if any of you guys change the cams out before you fit the carb , just seems to flood the motor with these cams , i realise the shooters may need changing out but just asking if this is a common problem with these 3 circuit carbs out the box?
Well my motor is tiny compared to yours,but I had to move down to 28's or 25's on the shooters and the yellow cam iam still trying to figure out how to move it to the 2 position.I think there is a brown cam that comes on later.
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Post deleted by Defbob
[Re: cudabunch]
#225850
02/15/09 06:34 PM
02/15/09 06:34 PM
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Anonymous
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Anonymous
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Re: Pump cams on 1050 3 circuit domi
[Re: 602heavy]
#225852
02/15/09 07:51 PM
02/15/09 07:51 PM
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Joined: Aug 2003
Posts: 43,163 Bend,OR USA
Cab_Burge
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I Win
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Bend,OR USA
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What list number, if it is a stock Holley carb, and dash number is the carb your having the problem with? If it is a custm made Dominator from some other comapny than Holley I can't help you on it,sorry
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Pump cams on 1050 3 circuit domi
[Re: 602heavy]
#225856
02/15/09 09:14 PM
02/15/09 09:14 PM
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Joined: Jun 2003
Posts: 9,225 Charleston
sixpackgut
Drag Week Mod Champion
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are you saying that carb came with 50 squirters? you can get brown cams and that will be a smaller pump shot. reduce the size of the squirter too. the brown cams come in 4150 and 4500 style so pay attention to that if you buy them
Gen 3 power 6.22@110, 9.85@135 Follow @g3hemiswap on instagram
performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
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Re: Pump cams on 1050 3 circuit domi
[Re: 602heavy]
#225857
02/15/09 09:16 PM
02/15/09 09:16 PM
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Joined: Aug 2003
Posts: 43,163 Bend,OR USA
Cab_Burge
I Win
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I Win
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Do you still habe the power valves in it? If so try reducing both of the power valve restriction channels down by bushing them and then enlarge it to what size you want I had one of those 8896-1 and sold it after having the front metering block modified by the carb shop and blocking off the rear power valve while testing that carb on a motor on the Carb shsop owners DTS engine dyno In retrospect I could have bushed both PVRC and enlarge them back to .035 to .050 while usig the wide ban as a guide on the dyno Live and learn That carb and another custom built (very expensive )1050 dominator made me end up liking the stock 9375 non HP 1050 Domintors so much
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Pump cams on 1050 3 circuit domi
[Re: Cab_Burge]
#225858
02/15/09 09:25 PM
02/15/09 09:25 PM
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Joined: Dec 2008
Posts: 1,200 UK
602heavy
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Ok , for what application are these carbs used on , maybe circuit racing? , Holley do not say which application these are best suited , most guys can't use these out the box , most change the metering blocks out for 2 circuit , why don't Holley have any info on there site stating this carb should not be used on a street/strip motor without extensive modifications , i got no issues working the carb to suit my combo , goes a bit far when you have to rework the complete metering system , been there with a mighty demon , ok i got it dialled in ok , but a lot of time & effort involved. PVs fitted front & rear.
Last edited by 602heavy; 02/15/09 09:28 PM.
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Re: Pump cams on 1050 3 circuit domi
[Re: 602heavy]
#225859
02/15/09 09:30 PM
02/15/09 09:30 PM
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Joined: Jun 2003
Posts: 9,225 Charleston
sixpackgut
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Brand: Holley Product Line: Holley Model 4500 Dominator Carburetors Part Type: Carburetors Part Number: HLY-0-8896-1 Number of Barrels: 4 Carburetor Flange: Dominator Choke: None Fuel: Gasoline Secondary Type: Mechanical New or Remanufactured: New Fuel Inlet: Dual CFM: 1050 Carburetor Finish: Dichromate Ford Kickdown: No Booster Type: Annular Throttle Linkage Type: Universal Quantity: Sold individually. Notes: Designed for single 4 barrel set ups. Features "soft" progressive mechanical linkage.
Carburetor, Model 4500, 1,050 cfm, Dominator, 4-Barrel, Dual Inlet, Dichromate, Each
Gen 3 power 6.22@110, 9.85@135 Follow @g3hemiswap on instagram
performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
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Re: Pump cams on 1050 3 circuit domi
[Re: sixpackgut]
#225860
02/15/09 09:31 PM
02/15/09 09:31 PM
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Joined: Jun 2003
Posts: 9,225 Charleston
sixpackgut
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sounds like your describing a different carb than what is listed there
Gen 3 power 6.22@110, 9.85@135 Follow @g3hemiswap on instagram
performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
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Re: Pump cams on 1050 3 circuit domi
[Re: sixpackgut]
#225861
02/15/09 09:36 PM
02/15/09 09:36 PM
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Joined: Dec 2008
Posts: 1,200 UK
602heavy
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Thanks sixpackagut , but that don't really tell you anything , maybe the progressive linkage does'nt help any , bearing in mind the fuel flowing on the intermediate circuit it might fair better if the sec shooters came in when the primary throttle blades are near open?
Thanks for the heads up.
Last edited by 602heavy; 02/15/09 09:46 PM.
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Re: Pump cams on 1050 3 circuit domi
[Re: 602heavy]
#225862
02/15/09 09:52 PM
02/15/09 09:52 PM
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Joined: Jun 2003
Posts: 9,225 Charleston
sixpackgut
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the accel pump shot system is the same in most all holleys and has nothing to do with the extra circuit.
the extra circuit does add fuel off idle and that may be the reason why it is so rich but you wouldnt see that happening looking at the carb. what is the squirters in the carb you have? a big squirter will shoot more fuel faster and a smaller squirter will shoot less for a longer duration
Gen 3 power 6.22@110, 9.85@135 Follow @g3hemiswap on instagram
performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
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Re: Pump cams on 1050 3 circuit domi
[Re: 602heavy]
#225864
02/15/09 10:09 PM
02/15/09 10:09 PM
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Joined: Jun 2003
Posts: 9,225 Charleston
sixpackgut
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change the 1 to 1 linkage. in the description i posted, it shouldnt have it anyway. if its not what you wanted then return it. if my engine was 605, my carb would be bigger than 1050 also
Gen 3 power 6.22@110, 9.85@135 Follow @g3hemiswap on instagram
performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
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