Who's switched to an MSD HVC coil from the older style round Blaster or Power Plus type? Did you see any difference? It seems many carburetor builders want you to use the HVC coil with their carb.

I would recommend using the MSD #8251 coil if your using a MSD 7 series box to get the most out of your ignition system. Especially if your using alcohol as a fuel.

IHRA ACDELCO Canadian Nationals
Top/et Iron man Champion
Don Davis 57 Corvette Super Gas roadster
SDPC 582 Head Hunter on alcohol

I changed to the hvc coil on my Camaro a few years ago, and it seemed to start faster. No issues. I have a digital 6 in my Camaro

quote:

Originally posted by Eman:
Who's switched to an MSD HVC coil from the older style round Blaster or Power Plus type? Did you see any difference? It seems many carburetor builders want you to use the HVC coil with their carb.

Which MSD ignition box are you using?

I switched from 7AL2 with pro power coil and grid controller to grid ignition and HVC coil. RPMa were jagged with 7AL2 and pro power coil. RPMa smoothed out when I went to the grid and HVC coil

I have the New HVC11 or what ever it is on my car but I have been told the specs are exactly the same as the Ford coils that you can get for about $12 at NAPA. Similar to these. https://www.ebay.com/itm/Unive...d:g:-bEAAOSwBLlU7MMk

I have bought one as a spare but have not ran it. No need to pull a good one off. As for performance difference there was not one bit of difference between the HVC and the old Pro power coil.

I had a 2 yr. old HVCII the caused a bad skip on top end, took all season to find - I went to original HVC 8251 (as 57 Vette also suggested) skip was gone.

quote:

Originally posted by markemark:

quote:

Originally posted by Eman:
Who's switched to an MSD HVC coil from the older style round Blaster or Power Plus type? Did you see any difference? It seems many carburetor builders want you to use the HVC coil with their carb.

Which MSD ignition box are you using?

I've got a 6AL

quote:

Originally posted by Eman:

quote:

Originally posted by markemark:

quote:

Originally posted by Eman:
Who's switched to an MSD HVC coil from the older style round Blaster or Power Plus type? Did you see any difference? It seems many carburetor builders want you to use the HVC coil with their carb.

Which MSD ignition box are you using?

I've got a 6AL

Imho if you are using the MSD round blaster coils with part # like 8200, 8202,8203, 8223 with the MSD 6al ignition box you have a good matching combination.

I would recommend looking at the spark plug wires for ones that are rated less than 300 ohms per foot and verifying that the your distributor cap, rotor and crank trigger if using are in proper working condition.

Fortunately I'm not having any problems. But every time I've spoken with a carburetor builder they insist I need the blue HVC coil.

How can having the strongest possible coil available to utilise the output of your ignition system to its fullest be a bad thing?

I’m using the blue HVC-II coil now.

When I got the HVC coil, I took it with me to the track, along with a new stock replacement Ford E-core coil, and the Blaster II coil that was on my car at the time.
Made a pass with the Blaster II, then put on the Ford e-core and made another pass. Absolutely no difference between the two.
Then I took the Ford e-core off, and put the HVC coil on and made a pass. Again, absolutely no difference except my wallet is now lighter.
No difference in ET, no difference in how it ran, you cannot tell any difference on my car as to which coil it’s using.
Ignition is an old 6AL with a Grid controlling it, triggered by a Moroso crank trigger, MSD Pro Billet (with the large diameter cap), and Taylor wires.
Your results may vary..

^^^^^^ This advice could save the OP $235 if he does not follow the carb builder’s recommendation.

imho if you want stronger ignition you should consider switching to a higher output ignition. The 6al is rated at 105 - 115 mj. The newer 6al2 is 135 mj. A 7al2/3 is 160 mj. The obsolete Dig7 is 190 mj. The Grid 7720 is 200 – 220 mj.

Along with this ignition upgrade you should consider purchasing the highest output coil that is recommended for the ignition.

I use the Grid 7730 / 7720 in my car. My spare for the 7720 in the event of a failure is a 6al box that I installed the same ends on as the 7720 for a quick emergency install. There is Absolutely no difference in ET between the 7720 and 6al when I’ve switched between them. The 6al is firing the same HVC2 (8261) coil as 7720. This 6al is my backup and I would Not recommend permanently using 8261 coil with the 6al.

BTW, the 6al / 7al2 with Grid 7730 is a greatest / least expensive $400 upgrade to programmable ignition.

quote:

Originally posted by Iforgot:
I’m using the blue HVC-II coil now.

When I got the HVC coil, I took it with me to the track, along with a new stock replacement Ford E-core coil, and the Blaster II coil that was on my car at the time.
Made a pass with the Blaster II, then put on the Ford e-core and made another pass. Absolutely no difference between the two.
Then I took the Ford e-core off, and put the HVC coil on and made a pass. Again, absolutely no difference except my wallet is now lighter.
No difference in ET, no difference in how it ran, you cannot tell any difference on my car as to which coil it’s using.
Ignition is an old 6AL with a Grid controlling it, triggered by a Moroso crank trigger, MSD Pro Billet (with the large diameter cap), and Taylor wires.
Your results may vary..

Thank You, that's a great a-b-c test.

I've run a 6AL for decades and have spares of everything. I know some that bought the blue HVC II coil on carb builders insistence. I've dealt with a carb builder that didn't want to talk to me unless I put an HVC coil on.

quote:

Originally posted by Iforgot:
I’m using the blue HVC-II coil now.

When I got the HVC coil, I took it with me to the track, along with a new stock replacement Ford E-core coil, and the Blaster II coil that was on my car at the time.
Made a pass with the Blaster II, then put on the Ford e-core and made another pass. Absolutely no difference between the two.
Then I took the Ford e-core off, and put the HVC coil on and made a pass. Again, absolutely no difference except my wallet is now lighter.
No difference in ET, no difference in how it ran, you cannot tell any difference on my car as to which coil it’s using.
Ignition is an old 6AL with a Grid controlling it, triggered by a Moroso crank trigger, MSD Pro Billet (with the large diameter cap), and Taylor wires.
Your results may vary..

......Ignition is probably the most misunderstood component of a race car. The engines ignition requirements are based on cylinder pressure- fuel type- RPM to some extent. If your ignition is meeting the demands of the motor based on the above conditions, there is no magic laying on the table. But as your power level goes up ( cylinder pressure increases) so does the demand on the ignition. Another area of major misunderstanding is spark plug gap.

quote:

Originally posted by Ron C.:

quote:

Originally posted by Iforgot:
I’m using the blue HVC-II coil now.

When I got the HVC coil, I took it with me to the track, along with a new stock replacement Ford E-core coil, and the Blaster II coil that was on my car at the time.
Made a pass with the Blaster II, then put on the Ford e-core and made another pass. Absolutely no difference between the two.
Then I took the Ford e-core off, and put the HVC coil on and made a pass. Again, absolutely no difference except my wallet is now lighter.
No difference in ET, no difference in how it ran, you cannot tell any difference on my car as to which coil it’s using.
Ignition is an old 6AL with a Grid controlling it, triggered by a Moroso crank trigger, MSD Pro Billet (with the large diameter cap), and Taylor wires.
Your results may vary..

......Ignition is probably the most misunderstood component of a race car. The engines ignition requirements are based on cylinder pressure- fuel type- RPM to some extent. If your ignition is meeting the demands of the motor based on the above conditions, there is no magic laying on the table. But as your power level goes up ( cylinder pressure increases) so does the demand on the ignition. Another area of major misunderstanding is spark plug gap.

Well stated Ron, you would not believe how many people on a Corvette site I frequent believe in manufactures BS claims regarding coils, plug wires, air filters etc. yield untapped power over stock components. PT Barnum stated it best.

quote:

Well stated Ron, you would not believe how many people on a Corvette site I frequent believe in manufactures BS claims regarding coils, plug wires, air filters etc. yield untap

I believe it. My son and I not only build and race our own blown alcohol stuff, but Crew Chief some really fast others cars. Old wive tells are hard to stamp out.