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Re: 3310 vac.sec to 750 d.p.
[Re: GTX MATT]
#834865
10/23/10 12:51 PM
10/23/10 12:51 PM
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Joined: Jan 2005
Posts: 3,699
Newport, Mi
Evil Spirit
master
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master
Joined: Jan 2005
Posts: 3,699
Newport, Mi
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I have used vac sec carbs with reasonable success but I always end up running the dbl pumper at the track the vac carb looses too much over allpower and generally goes up to .25 sec slower. I was lawys told never run a dbl pumper on a heavy auto car wrong! I tune mine to get throttle response from a very heavy car, Don't over jet and if I had the option I would use the 650 dbl pumper for real fast low speed response. I use the 750 on my stick car but a 650 has almost run the same time as the 750 off by.08 in qtr Going to try a 750 street avenger against a 650dbl hopefully this weekend. I want see all the hoopla over this carb
I assume you mean 770 Street Avenger. If there is hoopla there shouldn't be, its like any other carb. And the calibrations out of the box suck, on my stock 440 with headers the plugs were ghost white with the stock calibrations. Opening the secondaries provided no extra charge either.
I dont think double pumpers are good for the average street car. The idle circuit is intentionally extremely rich to satisfy cars with very big cams. Other than the fact that you need to change plugs more often, I think they are overall a more responsive carb. Im considering ditching this thing for a double pumper since a cam swap is in my future along with a third pedal.
your chirping 3rd with a 273?wish i could do it with my 727,must need more h.p.
Haha no way, I have a 440. And I wish it would chirp third but my 727 cant even chirp second. Its got a 2.9 lever in it.
From carbs to "chirping 3rd". Another successfully hi-jacked post. 
Free advice and worth every penny...
Factory trained Slinky rewinder.........
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Re: 3310 vac.sec to 750 d.p.
[Re: Evil Spirit]
#834866
10/23/10 12:56 PM
10/23/10 12:56 PM
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Joined: Feb 2005
Posts: 5,221
Branson, Mo.
joedust451
super gas
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super gas
Joined: Feb 2005
Posts: 5,221
Branson, Mo.
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From carbs to "chirping 3rd". Another successfully hi-jacked post.
I'll 2nd. that 
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Re: 3310 vac.sec to 750 d.p.
[Re: joedust451]
#834867
10/23/10 01:28 PM
10/23/10 01:28 PM
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Joined: Nov 2007
Posts: 21,832
Kirkland, Washington
Pacnorthcuda
Too Many Posts
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Too Many Posts
Joined: Nov 2007
Posts: 21,832
Kirkland, Washington
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From carbs to "chirping 3rd". Another successfully hi-jacked post.
I'll 2nd. that
I had a slant 6 Volare that would light em up as I grabbed overdrive....honest.
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Re: 3310 vac.sec to 750 d.p.
[Re: landon1]
#834869
10/24/10 12:15 AM
10/24/10 12:15 AM
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Joined: Feb 2005
Posts: 5,221
Branson, Mo.
joedust451
super gas
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super gas
Joined: Feb 2005
Posts: 5,221
Branson, Mo.
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i didn't have any luck with my VS holley. but i love my 650 DP on the 440. very responsive, plus my mileage actually went up with the double pumper. i wondered about the "not for heavy auto cars", but it's bull. 71 satellite 440/727 ~400 HP, 500 TQ with a 2.76 rear and 26.5" tires. runs great - light the tires up at part throttle, no bog, no springs - simpler, better design imo 
If its a newer 650dp, they leaned out the idle curcuit quit abit from the earlier ones, mine has .086" IABs up front, i was very surprized how light my plugs are, plus the idle mix screws are out 3 turns each, i "thought" that was odd, so i called holley tech & ask them why, he said anywhere from 1 too 3.1/2 turns out is just fine, with its factory 67/73 jets its a screamer. Mileage is surprizeingly good also.
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Re: 3310 vac.sec to 750 d.p.
[Re: MoparforLife]
#834870
10/24/10 12:24 AM
10/24/10 12:24 AM
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Joined: Oct 2005
Posts: 4,954
WI
Dcuda69
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master
Joined: Oct 2005
Posts: 4,954
WI
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The going thing fpr a vac secondary on the street is that it isn't opening the secondaries unless you need them. The DP will open them when you step a little hard on the throttle and the unburnt fuel either goes out the tail pipe or into the oil. Gas & oil make for very poor lubrication. Seen may cares come into the shop over the years with washed bearings and rings, pumping to start makes for a double shot every time too. race car oil is changed quite frequently so that the gas in the oil build up is taken care of but street cars tend to get more time and miles per change and damage can occur quite easily, but it seems that every body here is super careful and never seen or heard of it.
The 1st sentence is true. After that..??? If you know how a DP works,chances of washing bearings and rings is no more than a VS.
I've had a DP on my street car for YEARS and NEVER had gas in the oil. Cold start(WITHOUT a choke) does NOT require pumping the pedal to the floor!!!  
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