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Living with pump 91 with 10.2.1 BB
#1420505
04/15/13 10:17 PM
04/15/13 10:17 PM
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Joined: Feb 2011
Posts: 4,302
Nebraska
72Swinger
OP
master
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OP
master
Joined: Feb 2011
Posts: 4,302
Nebraska
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Ok I run 37 total and 17 initial on my 452 headed 451 with 10.2.1 CR. Car starts with no kick back and after 12 years of running this thing with a 110 octane/pump 91 mix it is where it runs best. Enter last year and I added a FAST EZ efi with the O2 sensor and figure no more leaded race gas and I get ping now lugging it and when rolling into the throttle at anything below 2500 rpm and its all good above 3000 rpm. Running MSD Billet dizzy and MSD Digital 6 box. Been thinking about heavier springs in the dizzy but am afraid im gonna lose the throttle response. Im just frustrated with the quality of fuels these days at the pump, its all pretty crap.
Mopar to the bone!!!
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Re: Living with pump 91 with 10.2.1 BB
[Re: 72Swinger]
#1420506
04/15/13 10:28 PM
04/15/13 10:28 PM
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Joined: Jan 2004
Posts: 903
Saskatchewan, Canada
cudabin
super stock
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super stock
Joined: Jan 2004
Posts: 903
Saskatchewan, Canada
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I hear you on the poor gas quality... That is why my new 440 Mr Six Pack Attack build is going togehter at 9.5 to 1 compression using 906 heads.
Do you have the manifold exhaust heat crossover blocked? Also are you running a 160 thermostat? Cool is always better to fight knock...
Can you at least get Non-ethanol 91 octane? I believe it will work better. here in Canada, the SHELL 91 has no ethanol, but other 91's do!
Good luck with it.
Arnie
67 Cuda 8.48@ 158.7 mph 1.18 60' 2,600 DA(so far...)
70 Super Bee 440 Six Pack 4-speed. 13.2 @ 104 Stock exhaust/Street tires.
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Re: Living with pump 91 with 10.2.1 BB
[Re: 72Swinger]
#1420508
04/15/13 10:32 PM
04/15/13 10:32 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Its gonna matter on the cam... being that those are iron heads you MIGHT be close but the cyl pressure will tell the store... what is the cranking pressure and the cam specs... if you cleaned any sharp edges in the chambers that will help... also if you can run the coolant temps lower that will help 
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Re: Living with pump 91 with 10.2.1 BB
[Re: MR_P_BODY]
#1420509
04/15/13 10:36 PM
04/15/13 10:36 PM
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Joined: Jun 2003
Posts: 9,225
Charleston
sixpackgut
Drag Week Mod Champion
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Drag Week Mod Champion
Joined: Jun 2003
Posts: 9,225
Charleston
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is there a quench pad on those pistons? if they are flat tops, put a closed chamber head on it
I ran my 12-1 engine on 91 at drag week but had the timing turned down to 32 because of that popcorn butter they sell out there
Last edited by sixpackgut; 04/15/13 10:39 PM.
Gen 3 power 6.22@110, 9.85@135
Follow @g3hemiswap on instagram
performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
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Re: Living with pump 91 with 10.2.1 BB
[Re: d-150]
#1420513
04/15/13 10:51 PM
04/15/13 10:51 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
what is fuel air ratio.13.7 would be ideal
thats gonna cause more detonation... fuel is a coolant also
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Re: Living with pump 91 with 10.2.1 BB
[Re: d-150]
#1420514
04/15/13 10:53 PM
04/15/13 10:53 PM
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Joined: Feb 2011
Posts: 4,302
Nebraska
72Swinger
OP
master
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OP
master
Joined: Feb 2011
Posts: 4,302
Nebraska
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Yep I think it is 13.7-8 at cruise and 13.1 at power. Problem is that is where it says it is but unless I have another o2 sensor gauge who knows.
Mopar to the bone!!!
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Re: Living with pump 91 with 10.2.1 BB
[Re: d-150]
#1420516
04/15/13 11:03 PM
04/15/13 11:03 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
asking a question what would be ideal my dyno guy shoots for that number
On a dyno he is shooting for max power... the number
comes up to what ever it is.. but it will be in the
12.6-13.0 range... dont ever go for a number when trying
to find power... find the power then see what the reading is...
cruise is a different matter
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Re: Living with pump 91 with 10.2.1 BB
[Re: MR_P_BODY]
#1420517
04/15/13 11:31 PM
04/15/13 11:31 PM
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Joined: Feb 2011
Posts: 4,302
Nebraska
72Swinger
OP
master
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OP
master
Joined: Feb 2011
Posts: 4,302
Nebraska
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I have 2 light silver springs and tried to blue springs yesterday and power was down quits a bit. Might just go with 1 light silver and 1 blue spring and hook up a retard switch that pulls 2 or 3 degrees out. http://setyourtiming.com/images/bwcharts.gif
Mopar to the bone!!!
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Re: Living with pump 91 with 10.2.1 BB
[Re: 72Swinger]
#1420518
04/16/13 01:37 AM
04/16/13 01:37 AM
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Joined: Oct 2003
Posts: 3,698
NE Oklahoma
Von
master
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master
Joined: Oct 2003
Posts: 3,698
NE Oklahoma
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Have you tried just pulling a few degrees out?
I have one 440 (10.12 comp) that would faintly rattle on a hot humid day at 37-38 total. Pulled it back to 34 and it was OK.
72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72.
Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.
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Re: Living with pump 91 with 10.2.1 BB
[Re: Von]
#1420519
04/16/13 02:35 AM
04/16/13 02:35 AM
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Joined: Feb 2011
Posts: 4,302
Nebraska
72Swinger
OP
master
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OP
master
Joined: Feb 2011
Posts: 4,302
Nebraska
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Yeah im also thinkin about changing bushings to reduce total timing a couple degrees. I need to get a new timing light too since my last one disappeared. When I tried the 2 blue springs the thing didnt take off until about 4800 rpm.
Mopar to the bone!!!
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Re: Living with pump 91 with 10.2.1 BB
[Re: Mopar Guy]
#1420522
04/16/13 01:44 PM
04/16/13 01:44 PM
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Joined: Feb 2011
Posts: 4,302
Nebraska
72Swinger
OP
master
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OP
master
Joined: Feb 2011
Posts: 4,302
Nebraska
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I will try all the suggestions. The 160 thermostat was tried last year and the car runs cooler with a 180.
Mopar to the bone!!!
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I'm not familar with the software and the abilities of your EFI system, can it control the timing? If so use it 
They probably make them in India but however buy one more and maybe spen a dollar or two more on a so caled good qualety one this time and see to that you have one or two smal bleed holes so it opends easy if there is preciure under the thermostat.
