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7's may be a bit too cool
Rich, You are talking two liter. Tubut is talking 2600. They are close, but not exactly the same.
I have used NGK BP7ES and found they tended to foul unless I ran the car long enough to get it really up to operating temperature. On short hops as a daily driver I did not like to have starting problems. So, I tried BP6ES AND THEY WERE BETTER. So if a little was good, more seemed better, so I also tried the next hotter BP5ES plugs for a while. I did not burn any holes in the top of the pistons, but, frankly, I did end up buying a damaged car with a hole in the top of a piston on which the prior owner said he always used BP5ES. So, I started to think that maybe BP6ES was hot enough.
But I also wondered why not use good old American Champions. Started with N6Y at first (Letters stand for 14mm thread and extended tip, number is the heat range, but it goes opposite way -- larger number, hotter plug) and found I had to run the engine for a length of time to make sure it was hot enough to clean off the plugs so as not to be fouled and difficult to start later. Then I went to N9Y and later changed to N9YRC (or is it NR9YC?) to add the resister to avoid static on my radio and what also came with a copper core. THESE I RECOMMEND. Also tried a N12Y which I do NOT recommend. Too hot.
But I have also used Bosch Plugs and Autolite, and can't recall the exact number of the plugs. I've used the multi electrode types. Just be sure to get your plug in the correct heat range, and to do that get your local NAPA or Yankee parts house to show you the information and comparison charts on the various spark plugs. Tell them some stupid guy uses N9Y Champions made in America and have him tell you the matching heat range numbers for whatever brand you want to swear by or at.
But let me confess the "hot" or "cold" confuses me a little. Is it a hot plug that still works when it is hot, or is it one that does not cool and so the inside of the combustion chamber is too hot? I do recall that I have burned electrodes off of plugs. I believe those to have been on lower numbers of NGK (5's) and higher ones (12's) of Champion. Ask the person who has the various kinds of plugs to explain how the heat ranges work. I once had a 1965 Champion manual that explained everything and gave comparative heat range numbers for Champion pugs and showed the heat ranges of competitors.
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[B]JAY NUXOLL [/B][EMAIL="jay@alfanut.com"], seriously Alfa diseased and ancient OLD Two Liter Lover, put together Seattle area's Northwest Alfa Romeo Club in 1965, and still feebly tries to tend a teeny sacred flame to his serpent mistress in the [B]ALFA G'RAJ MAHAL[/B], a home garage temple with more Alfa cars and parts than he dare list because of the disapproval of his shamed and chagrined family. (425) 641-2600.
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