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Old 07-21-2019, 02:13 PM   #1
90volvo
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Default would MSD stablize

Im doing a +T conversion on my 90 Volvo 240 NA car. I would love to do the megasquirt conversion but money tree isnt growning fast enough. I have a MSD 7AL laying around. I know it will boost the spart etc and give me some control over rev limiter and timing retarding. But will it help stablize the timing. If not is there a cheaper way to help in a turbo situation. I plan to pull my head and port it with manifold etc. Run a bigger cam. Hoping to get in 200+ range. I know the factory ignition isnt very stable. Thanks for any wisdom.
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Old 07-21-2019, 05:40 PM   #2
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I thought 2.4 timing was pretty stable? It’s the Chrysler ignition on 2.2 240s that is very unstable.
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Old 07-21-2019, 05:54 PM   #3
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The stock ignition with LH2.4 will be fine unless you start running much higher boost than stock.
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Old 07-21-2019, 08:55 PM   #4
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The stock ignition with LH2.4 will be fine unless you start running much higher boost than stock.
Yes I would and plan to run higher boost.
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Old 07-21-2019, 09:07 PM   #5
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Quote:
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Yes I would and plan to run higher boost.
How much higher? TLAO can speak to how far he has pushed it. I believe Kenny (linuxman51) has also pushed lh2.4 pretty hard.
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Old 07-21-2019, 10:22 PM   #6
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12-13 psi. I’ll start stock then work my way up. If the factory 2.4 will work then I won’t worry about it. I appreciate the help.
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Old 07-21-2019, 11:54 PM   #7
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Honestly, coming from a guy running a 6A for over a decade, just recently I've swapped back to stock ignition, but a nice BlasterSS coil. Seems to actually run a touch better than with the 6A on there.

Keep in mind, the MSD setup still gets a signal on when to fire from the EZK box, so no, you won't be any more stable with the 7AL than without.

FWIW, I've been running around 18psi for over a decade, the last few days I've been doing pulls at 26 with no issues at all.
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Old 07-22-2019, 02:50 PM   #8
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If you go above 12-13psi. You may need to make the spark plug gap a bit smaller or change to plugs that fire at a lower voltage like platinum or iridium with a smaller gap as well.
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Old 07-22-2019, 04:44 PM   #9
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Quote:
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If you go above 12-13psi. You may need to make the spark plug gap a bit smaller or change to plugs that fire at a lower voltage like platinum or iridium with a smaller gap as well.
Do redblocks do okay on iridium or platinum plugs if you’re using the stock coil and distributor?
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Old 07-22-2019, 09:16 PM   #10
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If gapped right, iridiums are fine. I ran those for a few years until my supplier realized they had them priced wrong. lol
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Old 07-22-2019, 11:24 PM   #11
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Quote:
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If gapped right, iridiums are fine. I ran those for a few years until my supplier realized they had them priced wrong. lol
thats awesome


What are the risks if they are not properly gapped? Just burnt out coil?
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Old 07-23-2019, 12:00 AM   #12
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Bigger chance of misfire is the worst usually, though that can lead to failed plug wires or arcing in the cap.
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