msd 7al2 querys

tuffxf · 12-16-2011, 05:54 AM

G,day,
Has any one done any real back to back testing between a 6al and 7al2 ignitions and verified any real world drag strip gains?
Also has any one compared the hi rpm timing on these units as far as any inherent retarding as rpm increases, are they similar between the units?
Engine is a roughly 600 hp na on alcohol.
Thanks very much!
Paul

GTX JOHN · 12-16-2011, 08:02 AM

Ran a 6 and Blue HVC coil and a 7 with Red HVC back to back with a

High Compression E/SA 340 and did not find a bit of difference. Same timing

and plug gap. Never had the time to fool with it any further.

Tim Ellis · 12-16-2011, 10:32 AM

Hey John, check your pms and email, thanks, Tim

tuffxf · 12-16-2011, 05:26 PM

G,day John and Pat,
Thanks very much for the replies! might pay me to see if i can find a good one,
Cheers
Paul

tuffxf · 12-16-2011, 10:44 PM

G,day Pat,
Thanks for the reply i'll send you a pm,
Cheers
Paul

Adger Smith · 12-18-2011, 02:44 PM

To add to what Pat said about power output.
We did a test and the 7 box would run a higher RPM with a wider plug gap before a spark induced miss.
This test was done on a high compression ratio Comp type engine.
I have one good used 7 Al and 1 brand new one I would be willing to sell.
PM me for contact info. pictures available for e-mailing

tuffxf · 12-19-2011, 05:13 AM

G,day Adger,
PM sent,
Thanks
Paul

Mike Pearson · 12-19-2011, 03:54 PM

Hi Pat.
First I would like to thank you for the informative posts. Due to reading these I am thinking about doing some upgrade to my ignition before the start of the season. I have a SS/ HA Camaro. I have a 7al2 box. The coil is an MSD Pro Power coil 20+years old, The plug wires are Moroso and are also at least 20 years old. I see you reccomend the 8251 coil. What would be a good choice for plug wires.

GTX JOHN · 12-22-2011, 08:17 AM

We run 8261 Coils on all our Stock/SS cars...............Is the 8251 a better
choice?

12-16-2011, 05:54 AM	#1
tuffxf Junior Member Join Date: Nov 2010 Posts: 41 Likes: 4 Liked 11 Times in 5 Posts	msd 7al2 querys G,day, Has any one done any real back to back testing between a 6al and 7al2 ignitions and verified any real world drag strip gains? Also has any one compared the hi rpm timing on these units as far as any inherent retarding as rpm increases, are they similar between the units? Engine is a roughly 600 hp na on alcohol. Thanks very much! Paul

12-16-2011, 08:02 AM	#2
GTX JOHN VIP Member Join Date: Jun 2009 Location: Boulder City, Nevada 89005 Posts: 2,733 Likes: 2,799 Liked 2,483 Times in 697 Posts	Re: msd 7al2 querys Ran a 6 and Blue HVC coil and a 7 with Red HVC back to back with a High Compression E/SA 340 and did not find a bit of difference. Same timing and plug gap. Never had the time to fool with it any further.

12-16-2011, 10:32 AM	#3
Tim Ellis Member Join Date: Dec 2004 Location: Beavercreek Or. Posts: 272 Likes: 31 Liked 7 Times in 6 Posts	Re: msd 7al2 querys Hey John, check your pms and email, thanks, Tim

12-16-2011, 05:26 PM	#4
tuffxf Junior Member Join Date: Nov 2010 Posts: 41 Likes: 4 Liked 11 Times in 5 Posts	Re: msd 7al2 querys G,day John and Pat, Thanks very much for the replies! might pay me to see if i can find a good one, Cheers Paul

12-16-2011, 10:44 PM	#5
tuffxf Junior Member Join Date: Nov 2010 Posts: 41 Likes: 4 Liked 11 Times in 5 Posts	Re: msd 7al2 querys G,day Pat, Thanks for the reply i'll send you a pm, Cheers Paul

12-18-2011, 02:44 PM	#6
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	Re: msd 7al2 querys To add to what Pat said about power output. We did a test and the 7 box would run a higher RPM with a wider plug gap before a spark induced miss. This test was done on a high compression ratio Comp type engine. I have one good used 7 Al and 1 brand new one I would be willing to sell. PM me for contact info. pictures available for e-mailing __________________ Adger Smith (Former SS) Last edited by Adger Smith; 12-18-2011 at 02:48 PM. Reason: sp

12-19-2011, 05:13 AM	#7
tuffxf Junior Member Join Date: Nov 2010 Posts: 41 Likes: 4 Liked 11 Times in 5 Posts	Re: msd 7al2 querys G,day Adger, PM sent, Thanks Paul

12-19-2011, 03:54 PM	#8
Mike Pearson VIP Member Join Date: Mar 2007 Posts: 2,446 Likes: 614 Liked 1,919 Times in 576 Posts	Re: msd 7al2 querys Hi Pat. First I would like to thank you for the informative posts. Due to reading these I am thinking about doing some upgrade to my ignition before the start of the season. I have a SS/ HA Camaro. I have a 7al2 box. The coil is an MSD Pro Power coil 20+years old, The plug wires are Moroso and are also at least 20 years old. I see you reccomend the 8251 coil. What would be a good choice for plug wires. __________________ Mike Pearson 2485 SS

12-22-2011, 08:17 AM	#9
GTX JOHN VIP Member Join Date: Jun 2009 Location: Boulder City, Nevada 89005 Posts: 2,733 Likes: 2,799 Liked 2,483 Times in 697 Posts	Re: msd 7al2 querys We run 8261 Coils on all our Stock/SS cars...............Is the 8251 a better choice?