Re: how much loss with six pack (small block stroker)?
[Re: kielbasa]
#1071947
09/09/11 12:39 PM
09/09/11 12:39 PM
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Joined: Jul 2010
Posts: 2,091 Delray beach, Florida
Performance Only
top fuel
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top fuel
Joined: Jul 2010
Posts: 2,091
Delray beach, Florida
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on a mild build, i think the better question would be how much gain, if done right. if your goal is what you stated, the six pack will easily get you there.
machine shop owner and engine builder
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Re: how much loss with six pack (small block stroker)?
[Re: scatpacktom]
#1071950
09/09/11 02:07 PM
09/09/11 02:07 PM
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Joined: Nov 2004
Posts: 354
kielbasa
OP
enthusiast
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OP
enthusiast
Joined: Nov 2004
Posts: 354
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Quote:
Power loss over what?
i should have specified... a modern 4 barrel
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Re: how much loss with six pack (small block stroker)?
[Re: kielbasa]
#1071955
09/10/11 07:00 PM
09/10/11 07:00 PM
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Joined: Oct 2007
Posts: 4,206 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,206
New York
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Using Vizard's rule ("find the restriction"), as power goes up the limited plenum volume of a 3×2 becomes a problem. At 400 it doesn't matter, at 700 it's fatal. In between...?? More cam, and especially overlap, is also tough because it upsets all the original careful jetting and leaves you playing with your drill set and cursing.
Boffin Emeritus
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Re: how much loss with six pack (small block stroker)?
[Re: kielbasa]
#1071960
09/11/11 08:06 PM
09/11/11 08:06 PM
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Joined: Aug 2003
Posts: 43,180 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,180
Bend,OR USA
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Quote:
Quote:
Power loss over what?
i should have specified... a modern 4 barrel
I dnyo tested my low deck sixpak motor(518 C.I. Pump Gas) with the sixpak and then 30 minutes later a Team G intake and 1050 Dominator, I actually tested three different Holley 1050 Dominators and I had to add a Wilson Manifold 2 inch reversion spacer to get the single, modern, four barrel carb. power close to that old design sixpak on that motor The best dominator on the Wilson reversion spacer made 708 HP and 750 Ft. Lbs and the sixpak made 718 HP and 750 Ft Lbs, same dyno, same day More air with the proper mixture of fuel made more power
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: how much loss with six pack (small block stroker)?
[Re: BEEQUIK]
#1071962
09/12/11 01:19 AM
09/12/11 01:19 AM
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Joined: Dec 2003
Posts: 1,153 Adrian, Mi
pro6pakRR
mopar addict
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mopar addict
Joined: Dec 2003
Posts: 1,153
Adrian, Mi
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Quote:
OK- i know you said smallblock but I think this may help.I had a 69 Superbee and was running a stock style 6-pack. Car was running 12.60's at the time and I had an M-1 single plane intake and a new Holley 750 vac. secondaries carb.Went to the track and made 2 passes with the sixpack.12.60 and 12.61. Switched the intake and carb to the 4 barrell and went 12.61 and 12.61. So in my application I saw no difference. When I installed the new engine it ran a best of 11.60 with the sixpack and didnt put a four barrell on that combo.
Mine was the same went 11.53@117 with 6 pack and 11.58@116 with M1 and 850 Holly.Same day about 15 min.between passes.Just took one intake and carb off put other on.
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Re: how much loss with six pack (small block stroker)?
[Re: Cab_Burge]
#1071966
09/12/11 07:43 PM
09/12/11 07:43 PM
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Joined: Jan 2003
Posts: 24,562 Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
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Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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Quote:
Keibasa, I had to jet my outboard carbs way up to get it to make more power than the 1050 Dominator did, 66 or 67 jets in the center and .092 or .094 on the dirver sides and .096 or .098 on the passenger side outboard carbs depending on the track elevation and current weather Most stock jetting on the factory sixpaks sucked wind big time
I run 70's and 35 squirters, stock metering plates, stock intake. I do have 1/2" spacers under all 3 because the water/meth fogs under the center. I think the factory jets were 64? Plenty for a stockish 440. Have a few friends run high 11's (in a b-body) with nothing more than good compression decent heads (iron), 509 cam and a six pack.
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Re: how much loss with six pack (small block stroker)?
[Re: 340SIX]
#1071973
09/13/11 09:20 PM
09/13/11 09:20 PM
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Joined: Jul 2007
Posts: 37 San Diego CA
Bruce K Bridges
member
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member
Joined: Jul 2007
Posts: 37
San Diego CA
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No losses that weve seen... Dry. the B/RB and the LA manifolds are very nice designs. The LA from Mopar Perf needs a few+ hours of diegrinder work for basic performance (carbs) due to lots of core shift and flash. The Edelbrocks not so much. You can open up the plenum about 25% if your running it dry, but Id leave it alone with carbs to maximize velocity to combat fuel distribution issues. Well tuned carbs work great but its a lot easier to tune the computer, or better yet, let it tune itself! Weve seen mid 600hp RB and LA stroked motors using the dry 6bbl intake. Wed like to see how much more the intake can support modified for EFI... BKB
I sell fuel injection, but Ill still rebuild your carb if I have to...
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Re: how much loss with six pack (small block stroker)?
[Re: Ari440]
#1071975
09/14/11 12:03 AM
09/14/11 12:03 AM
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Joined: Mar 2009
Posts: 2,464 Sydney,Australia
tex013
top fuel
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top fuel
Joined: Mar 2009
Posts: 2,464
Sydney,Australia
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thanks for the real world feedback Ari.i've always wondered how the weiand would work,fuel distribution/puddling on the street
Tex
New best ET 10.259@129.65 . New best MPH 130.32 Finally fitted a solid cam, stepped it up a bit more 3690lbs through the mufflers New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm Power by Tex's Automotive
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Re: how much loss with six pack (small block stroker)?
[Re: Ari440]
#1071977
09/14/11 01:39 AM
09/14/11 01:39 AM
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Joined: Mar 2009
Posts: 2,464 Sydney,Australia
tex013
top fuel
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top fuel
Joined: Mar 2009
Posts: 2,464
Sydney,Australia
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thanks Ari. if i ever get lucky enough to use one i may ask for a internal pic Tex
New best ET 10.259@129.65 . New best MPH 130.32 Finally fitted a solid cam, stepped it up a bit more 3690lbs through the mufflers New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm Power by Tex's Automotive
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