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PostPosted: Wed Aug 08, 2018 8:03 pm 
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Supercharged
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I am going to put an Edelbrock SP2P intake manifold on my 82 Ramcharger. It is a 318, but the same stock carbs were used on Super Six equipped slants. I am also planning some other modifications to the motor that might require some tuning to the carb to make it run properly again. Since the slant used the same two barrel carbs as the 318, I figured you all might be able to tell me which stock two barrel carb is more tuning friendly- the Holley 2280 or the Carter BBD. At this point I am leaning towards the BBD since I know I can use Edelbrock jets in it. I don't think the Holley 2280 uses normal Holley jets. The BBD is also more adjustable with the metering rod adjustment rather than the 2280 vacuum operated power valve.

Am I totally off base? Any input appreciated.

P.S. the 318 will be a low RPM torque emphasized motor so I am not contemplating any four barrel swap at this point.


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PostPosted: Thu Aug 09, 2018 7:05 am 
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Turbo Slant 6

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Edelbrock step up piston springs fit the bbd and bbs carbs. With the sp2p delayed power enrichment might make better mpg. Shorter lighter spring or for more torque early longer stiffer spring. The original carter spring kit had one more spring than edelbrock a 10 pound spring. Edelbrock stops at 8 pounds. That spring can be stretched if needed.


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PostPosted: Thu Aug 09, 2018 8:46 am 
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Thanks! Looks like I will be digging through my carbs pile to find a good BBD.


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PostPosted: Thu Aug 09, 2018 10:17 am 
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There are two different metering rod lifter arms used in the bbd. The difference was at just off idle to mid range throttle opening.As throttle passed half way point almost the same. Before full throttle they were the same. This was sort of a half moon tapered effect. This was a piston stop to limit upward travel of step up piston being pushed up by the step up spring. In other words enrichment was limited by throttle position.The green one used in most slants,but not all, restricted upward travel of piston much more than the black ones used in most v8s but not all. These can be changed. For example some slant wagons used v8 metering rod arm and stiffer step up spring for the 1979 model year. From reading tsbs my guess was this was done for nox emissions. Rich mixtures burn cooler thus less nox also less mpg. At rebuild some would replace v8 arm with the green one same as sedan models and 1978 wagons. Some 318s used the green slant six metering arm.


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PostPosted: Thu Aug 09, 2018 11:10 am 
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Supercharged
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Wow, this is great info! Where are you getting it? Is there a tuning manual fir the BBD?


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PostPosted: Thu Aug 09, 2018 4:53 pm 
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No tuning manual for BBD, but there are training and theory of operation manuals plus old TSB,s viewtopic.php?t=55801


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PostPosted: Thu Aug 09, 2018 6:48 pm 
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Oh, yeah! I forgot the interchange info was in there, too. It has been a while since I tinkered with carbs.


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PostPosted: Thu Aug 09, 2018 8:29 pm 
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I would use an adapter and an Autolite 2100 carb from a 304 AMC v8. Much better carb then either the Holley or Carter and you can actually get tuning parts for them.


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PostPosted: Thu Aug 09, 2018 8:31 pm 
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Supercharged
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kesteb wrote:
I would use an adapter and an Autolite 2100 carb from a 304 AMC v8. Much better carb then either the Holley or Carter and you can actually get tuning parts for them.


I will keep that in mind. Short term, I already have the BBD. I think i can pick up an Edelbrock tuning kit for about $50 on eBay with jets and springs and metering rods. I will try that first but if I need to get crazy I will think about changing to a different two barrel carb.


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PostPosted: Fri Aug 10, 2018 2:20 am 
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Edelbrock jets and springs fit the BBD ,metering rods do not. Do not buy any thing just yet. On the sp2p v8 or slant carb, just bolt on and go. Real carb tuning starts with wide band. 35 years ago had a couple sp2p in taxi service worked out real well.The sp2p has small runners, thus high port velocity,thus good vaporization. Small plenum also helps with more even fuel distribution and better vaporization.


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PostPosted: Fri Aug 10, 2018 6:15 am 
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viewtopic.php?f=19&t=35294&hilit=qualifying


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PostPosted: Fri Aug 10, 2018 6:59 am 
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Supercharged
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Wow, thanks again! Tons of good info. I was planning on starting with the carb in stock condition, I just wanted the ability to tune it if the SP2P changed the vacuum signal too much. A wide band is part of the plan.


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