Sign in to follow this  
tomw51

Spark Plugs, and wires for V12

Recommended Posts

Which are the best spark plugs for 1946 Continental, V12. I have mixed plugs on mine now, and one of the is a H10. Are Motorcraft AL7C good or are Champion H10C better ? Im also looking for the spark plug wires anything special about them ?

Share this post


Link to post
Share on other sites

About my plug wires. Now I have wires that have bare metal ends exposed that clip onto the spark plug. Would anyone recommed using rubber shield wire instead of the exposed. Looks wise I like the bare metal. What are you guys using out there for your V12's ?

Share this post


Link to post
Share on other sites

Champion H-10 are the correct plugs for your car however you can use an equilivant to that of course.

The plug wires have no rubber boot on them.

Tom

Share this post


Link to post
Share on other sites

You may find that with modern ( slower burning) fuel the H12's or 1 step hotter Autolite, NKG will burn cleaner. The Motorcraft AL7 are supposed to run a little hotter than the H10 so it might also be OK.

Share this post


Link to post
Share on other sites

I got a 7mm set from Pertronix, bought a V8 set and ordered four extra wires. They are supposed to be good for 40,000 volts which should avoid sparking inside the metal tubes.

Abe

Share this post


Link to post
Share on other sites

Ijust installed a nice repro set , and bought a spare..but am disappointed to report arcing in the conduits..really

ticks me off.....time and trouble to do'em right......Yes to answer your question..they were stock black laquered with bare metal ends,.. wreak havoc on radio reception and bad on

rainey days but correct for historical review......not certain what i will do now....

Share this post


Link to post
Share on other sites

I have had good luck making up my own sparkplug wires. Used both Packard 440 and Belden wire and have no problems with arcing or radio interference. You do need to have extra condensers on the 2 coil/ignition wire terminals.

Share this post


Link to post
Share on other sites

I use Packard 440 wire you can still get spools of it cheap at the swap meets, I think I paid 10 dollars for a brand new spool last year. I use the red crown 90 degree ends still with exposed metal on the H10c plugs. The red crown ends are old school hot rod stuff like what Packard used on thier V12s, it just adds a little color to the engine compartment.

Share this post


Link to post
Share on other sites

I cannot understand the arcing you say you are now getting after installing new ignition wires in your conduit.

Was the wire you used old stock that was stiff and possibly the insulation cracked internally ?

Old dried-out and stiff ignition cable is almost worthless in my opinion.

You still find spools of it around on eBay and at auto flea markets.

I bought an entire spool of NOS Packard ignition cable in a box on eBay that was dried-out & pure worthless junk!

Did you possibly nick or chafe the wire while threading it into the conduit ?

Did you hear cracking when you tried to bend this ignition cable ?

New old style ignition wire should not have any external leakage sparking or arcing !

I suspect the new ignition cable you used was too old or internally the rubber insulation was dried-up, stiff , cracked and defective.

Edited by Silverghost (see edit history)

Share this post


Link to post
Share on other sites

I found H10c spark plug replacement for H10 I suppose that would be fine, but what about H12 plugs is that okay ?

Share this post


Link to post
Share on other sites

I think you will find that the H12's will burn cleaner and not foul as quick as the H10's or the H10c's.

Share this post


Link to post
Share on other sites

I purchased my new wire sets from a honorable lzoc member ....and i refrain from naming out of a great respect... no they were not stiff...and i dont think i damaged em, but obviously must have...they slid in pretty easily but i fought with a couple after wrong routing forced me to pull and put back ...(answered my own question i suppose) I have always run h-10s.. but

for the heck of it installed a set of ngk's (jim zeffer said it was sacriledge ..jap plugs in a 40's American car!) but they have run properly so far...H-10c is just the new copper cored version of traditional plug that came stock.

Share this post


Link to post
Share on other sites

Ditto on NGKs. I have used them in many of my old cars with better results than Champions or other brands. The only reason I can think if is that one of the features of any spark plug is its ability to "self-clean". NGKs seem to stay cleaner longer in older carburetted engines that run richer mixtures. That has been my experience.

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
Sign in to follow this