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GoFastRacer
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Posted: Mar. 30 2003,6:33 am |
Post # 5 |
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| Quote (miller19j @ Mar. 29 2003,1:10 pm) | My old carb is leaking all over the place and I think one of the floats has a problem. It is a Automotive carb and I had thought about replacing it with a marine carb for some time now. With the covered engine I would like to have a marine carb just for peace of mind. I think now would be a good time before I start a fire. Â
Currently it is a 750dp and I thought I would replace it with a marine 750dp but now I have a choice between mechanical and vacuum secondaries. I think that I have vacuum secondaries currently but am not sure. What are the pros and cons between the two. I really need help deciding as I have no clue.
The other question is how hard are they to adjust out of the box? Do I just bolt it on and go or is their a lengthy adjustment procedure?
Any help would be greatly appreciated. |
Since you don't have a race application here, I would highly suggest losing the double pumper, it has no value. All you're doing is using more gas for nothing. With the vacuum secondaries, they only open as you need them and operation is a lot smoother. Tuning them is very simple, if it even needs to be messed with. An appropriate size carb is set close from the factory. Most of the time, the shooters are they only thing you may have to enlarge if you get a stumble on take off. The secondaries are just a matter of changing springs. You can get a kit with assorted springs also you can get a quick change cover to make changing springs a snap, no more undoing the diaphram. The best way to do it is to take it out of the box, make sure everything is tight, bolt it on and try it as is, you may be supprised how well it may work right out of the box, then go from there. BTW, if you have an engine cover, do get a marine carb, for venting purposes. I's not so much the fire, it's that "KABOOM" that will kick you in the ass!... Hope this helps!... 
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GoFastRacer
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Posted: Mar. 30 2003,5:32 pm |
Post # 7 |
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Anytime Brad, if you have questions, just holler!.  BTW, what's the list number on that carb?, I may be interested in it if you want to part with it after you get your marine carb!.. 
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GoFastRacer
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Posted: Mar. 31 2003,11:29 am |
Post # 10 |
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| Quote (miller19j @ Mar. 31 2003,8:30 am) | | Quote (GoFastRacer @ Mar. 30 2003,5:32 pm) | | Anytime Brad, if you have questions, just holler!. Â BTW, what's the list number on that carb?, I may be interested in it if you want to part with it after you get your marine carb!.. |
I will check tonight. I have no use for it after I get a new one. |
Cool!..
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GoFastRacer
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Posted: Mar. 31 2003,11:30 am |
Post # 11 |
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| Quote (blown 472 @ Mar. 31 2003,8:36 am) | | Aint nothing finer than a brand new carb, put it on set the idle and drive it. |
Yeah, if you're lucky!. 
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GoFastRacer
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Posted: Mar. 31 2003,6:19 pm |
Post # 13 |
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Thanks, 3310 is the List no!, it's a 780, that's all I need to know, let me know what you want for it when you're ready to dump it, I may buy it!.
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GoFastRacer
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Posted: Mar. 31 2003,7:22 pm |
Post # 15 |
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Actually now it is a 750, the 3310 used to be rated at 780, don't know why they changed it?, that carb has been around for ages!.  As far as what ther'e worth, that's hard to answer, the swap meets are full of them, I see them from $10 to $75 depending on the shape they are in. What you get for them depends a lot on the person buying it, if he can't rebuild it himself then he'll pay more if it looks in good shape?, what kind of shape is yours in?.. 
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GoFastRacer
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Posted: April 01 2003,8:33 am |
Post # 17 |
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Sounds like an internal leak. The part you're talking about are called booster venturis. A pic would be cool!..
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HolyMoly
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Posted: April 01 2003,10:35 pm |
Post # 18 |
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The new HP model carbs from Holley work really well, right out of the box. They are dp's, but they use progressive linkage on the secondaries. I think these are well worth the money.
I ran a single 950 HP Holley on my blown sbc the first time it was built. It ran awesome! I am now running dual 4150 750 DP's (I got them for free) but I think the single 950 ran better most of the time. It was trouble free - and looked cool. The HP's almost look like the Demon's - except half the price and little tuning needed.
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GoFastRacer
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Posted: April 02 2003,7:26 am |
Post # 19 |
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The HP carbs are cool right out of the box, a friend of mine put one on his and he likes it. Since they are a DP, they work best on a single plane manifold. On a non high performance ski boat with a dual plane manifold, a vacuum secondary carb would be smoother and easier on gas since you're running most of the time at part throttle. This way, the secondaries will open only if the motor needs it. Don't remember, does the HP series come in a marine configuration??.
Your 950 ran better because it was about the right size carb for your application. A pair of 750's is 1500 cfm, that's a lot for a small block unless it's a mega buck Pro Stock type deal..
Here I go shooting my big mouth off again!...
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HolyMoly
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Posted: April 02 2003,7:40 am |
Post # 20 |
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Yes, the 950 was the right set up for my sbc in the first blower build. It made about 550 HP - ran 4 lbs of boost - redline of 7000.
Now, it makes 750+ HP. Runs 12 lbs of boost. (Currently changing the cam so redline will be 6500). Theoretically, the motor requires ~1300 CFM. So, the dual 750's are on the big side, but have been tuned in on the dyno. They are a set of Gary Williams. I do get a better hole shot at 3/4 throttle vs. wide open.
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blown 472
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Posted: April 02 2003,7:42 am |
Post # 21 |
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| Quote (GoFastRacer @ April 02 2003,7:26 am) | The HP carbs are cool right out of the box, a friend of mine put one on his and he likes it. Since they are a DP, they work best on a single plane manifold. On a non high performance ski boat with a dual plane manifold, a vacuum secondary carb would be smoother and easier on gas since you're running most of the time at part throttle. This way, the secondaries will open only if the motor needs it. Don't remember, does the HP series come in a marine configuration??.
Your 950 ran better because it was about the right size carb for your application. A pair of 750's is 1500 cfm, that's a lot for a small block unless it's a mega buck Pro Stock type deal..
Here I go shooting my big mouth off again!... Â Â |
I have seen small block blown motors with two 1050's, blown motors like an unrestriced inlet. Unlike my ex.
If quizzes are quizzical, what are tests???
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| Member # 16 | Joined: 12-06-2002 | |
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GoFastRacer
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Posted: April 02 2003,7:52 am |
Post # 22 |
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| Quote (HolyMoly @ April 02 2003,7:40 am) | Yes, the 950 was the right set up for my sbc in the first blower build. Â It made about 550 HP - ran 4 lbs of boost - redline of 7000.
Now, it makes 750+ HP. Â Runs 12 lbs of boost. Â (Currently changing the cam so redline will be 6500). Â Theoretically, the motor requires ~1300 CFM. Â So, the dual 750's are on the big side, but have been tuned in on the dyno. Â They are a set of Gary Williams. Â I do get a better hole shot at 3/4 throttle vs. wide open. |
LOL, funny you should mention 3/4 throttle, back in the 80's a buddy and I ran a 23 T altered car in the high 8's. All it had was a 427, it was an L88 except for the cam, we decided to try a 1050 dominator, the car slowed down at full throttle so we put a stop at 3/4 throttle and it picked up almost a tenth, about the same as it did with an 850. Then we put injectors on, needless to say, all carbs were shitcanned!...
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GoFastRacer
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Posted: April 02 2003,7:53 am |
Post # 23 |
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| Quote (blown 472 @ April 02 2003,7:42 am) | | Quote (GoFastRacer @ April 02 2003,7:26 am) | The HP carbs are cool right out of the box, a friend of mine put one on his and he likes it. Since they are a DP, they work best on a single plane manifold. On a non high performance ski boat with a dual plane manifold, a vacuum secondary carb would be smoother and easier on gas since you're running most of the time at part throttle. This way, the secondaries will open only if the motor needs it. Don't remember, does the HP series come in a marine configuration??.
Your 950 ran better because it was about the right size carb for your application. A pair of 750's is 1500 cfm, that's a lot for a small block unless it's a mega buck Pro Stock type deal..
Here I go shooting my big mouth off again!... Â Â |
I have seen small block blown motors with two 1050's, blown motors like an unrestriced inlet. Â Unlike my ex. |
That's funny!..
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blown 472
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Posted: April 02 2003,8:11 am |
Post # 24 |
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| Quote (GoFastRacer @ April 02 2003,7:52 am) | | Quote (HolyMoly @ April 02 2003,7:40 am) | Yes, the 950 was the right set up for my sbc in the first blower build. Â It made about 550 HP - ran 4 lbs of boost - redline of 7000.
Now, it makes 750+ HP. Â Runs 12 lbs of boost. Â (Currently changing the cam so redline will be 6500). Â Theoretically, the motor requires ~1300 CFM. Â So, the dual 750's are on the big side, but have been tuned in on the dyno. Â They are a set of Gary Williams. Â I do get a better hole shot at 3/4 throttle vs. wide open. |
LOL, funny you should mention 3/4 throttle, back in the 80's a buddy and I ran a 23 T altered car in the high 8's. All it had was a 427, it was an L88 except for the cam, we decided to try a 1050 dominator, the car slowed down at full throttle so we put a stop at 3/4 throttle and it picked up almost a tenth, about the same as it did with an 850. Then we put injectors on, needless to say, all carbs were shitcanned!... Â |
Ah, injected motors, I am planning a long term project, flatie with an injected small block on 50 to 60 percent nitro.
If quizzes are quizzical, what are tests???
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9-18-2024 Not boat related (Rep.#2) from: BigDog
It's a minor prob. that I will live with it's not worth going out and buying a new carb.
