Anyone know if the standard Bosch ignition coil for our 8v 944s is oil filled?

[matt1415]

Looking at swapping out the ignition coil in my 924s and I wanna know what you guys think. I found NGK offers an oil filled ignition coil for our cars but it looks the exact same in appearance to the Bosch coil and cost a bit more. I just wanted to know if there is an actual difference between the Bosch and NGK coil or if both of these are oil filled. I love NGK products but if there is no benefit to spending a bit more I'll keep the factory one. Has anyone cut open a Bosch coil before? Unfortunately I don't have an extra to sacrifice


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[v2rocket_aka944]

Not really any such thing as an upgrade to this type of ignition coil, fwiw.

[guru944]

Recommend MSD Blaster 2 Coil as an upgrade they wire right p with 30% more spark Energy.

[v2rocket_aka944]

"more spark energy"...the stock coil's spark doesn't blow out at 6500rpm and 20psi of boost...running an NA engine is cake for it...what more do you want?

the only "upgrade" you might get is being able to open up the spark plug gaps wider which has idle and smoothness benefits....but if you're going to upgrade you may as well ditch the distributor altogether

[matt1415]

Originally Posted by v2rocket_aka944

"more spark energy"...the stock coil's spark doesn't blow out at 6500rpm and 20psi of boost...running an NA engine is cake for it...what more do you want?

the only "upgrade" you might get is being able to open up the spark plug gaps wider which has idle and smoothness benefits....but if you're going to upgrade you may as well ditch the distributor altogether

In terms of upgrading I wanted to go back to running iridium plugs but heard through some members on the forum that our stock ignition coil does not like these plugs for what ever reason. I used to run NGK iridium ix and loved them but I changed back to the wr7dc when I heard this. My 924s does not run anywhere near as smooth with the standard copper then when I had the Iridiums in it. I was looking for an upgrade in the coil to be able to run these plugs but what's the reason our stock coil can't handle this?


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[v2rocket_aka944]

iridium is a worse conductor than copper.
but it is more resilient/stays clean longer, so iridium gets used for 'long life' plugs on cars where it's hard to change plugs out, like a DOHC subaru where the plug is 1" from the frame rail.

the 944 has the easiest spark plugs in the history of time to change so just go with plain old cheap reliable correct copper...

changing spark plug "metal" shouldn't really affect how the car runs. however if the gap is wrong there could be smoothness effects.

[matt1415]

Thanks for the info as always. I'm still running the 0.28 recommended gap on the NGK Iridium plugs but the electrode is pointed unlike the flat one on the wr7dc plugs. Don't know if that accounts for anything's but they definitely run smoother

[DannoXYZ]

Of course new plugs will run better than old worn-out plugs. Smaller gap requires less energy to jump, so no need to "upgrade" coil. Better to run factory-specified gap with copper plugs. Will then have higher spark-energy.