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perrinoya
Post: 247
Location: Dallas Tx
 | | Subject: Rebuilding my motor. Wed 31 Mar 2010, 8:45 pm | |
| I have never known much about how motors work, or cars in General. Ive always had an interest though. This is my first project car so Im learning alot.
I have a single port motor that I am going to get rebuilt. I bought some dual port heads, a dual port manifold that works with a double barrel carb. (I bought a holly)
I have a few questions.
1. Will these upgrades give me a noticeable amount of increased power?
2. whats the difference between a double barrel carb and dual carbs (besides the obvious reason of mounting) Is a double barrel carb comparable to dual carbs?
3. any suggestions for ad ons?
4. I need an airfilter/ cover that is weather resistant that fits a double barrel holly carb.
all advice is much appreciated. |
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Terry
Administrator
Post: 1192
Location: Lone Oak, Texas
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perrinoya
Post: 247
Location: Dallas Tx
| | Subject: Re: Rebuilding my motor. Wed 31 Mar 2010, 9:14 pm | |
| I mean two single carbs? one on each side of the motor.
whats the difference between having 2 single barrel carbs or just having just a double barrel carb
My math tells me its the same but is one better? 2 single carbs or a double barrel carb |
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Canardman
Post: 70
Location: Waco, TX
| | Subject: Re: Rebuilding my motor. Wed 31 Mar 2010, 9:15 pm | |
| I may be wrong, but I think the Holley carbs are progressive type. Most all of your dual carbs are non progressive.
Copied from aircooled.net. Credit for article here <--- Lots of GREAT carb info on this page.
| Quote: | CENTERMOUNT 2BBL SYSTEMS
PROGRESSIVE carburetors used on VW's are mechanical secondary carburetors. A mechanical secondary carburetor opens in relation to throttle position. The Progressive set-up uses a small primary barrel, allowing for excellent drivability and mileage. These also offer a larger secondary barrel for more power when you open the throttle. These carburetor kits can take a lot of time - up to 8 hours - to dial in for your particular car. This is partly because they are supplied from the factory with generic jetting often not suited for the VW engine, and also partly because the jets can be difficult to access. A good kit won't be too far off straight out of the box, but even a close one will need some tweaking before it is perfect! The centermount progressive is a fantastic carburetor once it's jetted properly (but remember that it's no small task). Most are also available with an electric choke, making it easier to start and drive when the engine is cold and when air temperatures are colder. Most stock carburetors came with electric chokes, and they definitely made life easier for the driver of a vehicle with a centermount set-up. The Progressive set-up is an excellent combination of performance, drivability, and economy. The main downfall of this system is the time it takes to get it set up properly.
NON-PROGRESSIVE systems usually use a Dellorto DRLA or Weber IDF or DCNF 2BBL carburetor. The Non-Progressive carburetor set-up tends to sacrifice drivability and economy in favor of performance. |
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perrinoya
Post: 247
Location: Dallas Tx
| | Subject: Re: Rebuilding my motor. Wed 31 Mar 2010, 9:21 pm | |
| ahhhhh ok. I was playing with the carb and when I moved the throttle one barrel opened and when I moved the throttle even more they both opened up.
so from what I understand my carb is kind of like a normal carb but with an extra barrel used to kick in when more power is needed.
Very nice article thank you! Helps alot.
Last edited by perrinoya on Wed 31 Mar 2010, 9:24 pm; edited 1 time in total |
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Terry
Administrator
Post: 1192
Location: Lone Oak, Texas
| | Subject: Re: Rebuilding my motor. Wed 31 Mar 2010, 9:22 pm | |
| I'm not a two carb wizard, but I would think it would give more power because of the shorter distance to the cylinder / increased air flow and air temp remaining lower (I know that one from my drag racing days). Cooler air is better air, horsepower wise.
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Cell # 903.456.0192
'69 bug
I like my women like I like my chicken with a little bit of fat on the ends. Not to much, not to little, just enough to make me grin. - Rodney Carrington |
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Canardman
Post: 70
Location: Waco, TX
| | Subject: Re: Rebuilding my motor. Wed 31 Mar 2010, 9:34 pm | |
| | Terry wrote: | | I'm not a two carb wizard, but I would think it would give more power because of the shorter distance to the cylinder / increased air flow and air temp remaining lower (I know that one from my drag racing days). Cooler air is better air, horsepower wise. |
Ditto. The other advantage is: the more air you can get into an engine (and maintain desired fuel/air ratio) the better the volumetric efficiency. (making the most of your engines potential) Having 1bbl per cylinder allows the engine to breathe very well. Beware of going too large though. |
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perrinoya
Post: 247
Location: Dallas Tx
| | Subject: Re: Rebuilding my motor. Wed 31 Mar 2010, 11:20 pm | |
| | Heres another motor question.... I painted my headers with a high heat resistant paint (made for bbq grills) looks great.... would it be alright to paint my manifold? |
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Terry
Administrator
Post: 1192
Location: Lone Oak, Texas
| | Subject: Re: Rebuilding my motor. Thu 01 Apr 2010, 5:30 am | |
| Intake... I vote no.
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Cell # 903.456.0192
'69 bug
I like my women like I like my chicken with a little bit of fat on the ends. Not to much, not to little, just enough to make me grin. - Rodney Carrington |
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