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Engine basics => Engine set up tips => Topic started by: Bootlegger on October 04, 2017, 12:44:34 PM

Title: O S glo plugs
Post by: Bootlegger on October 04, 2017, 12:44:34 PM

  What O S plug number do you find works best in O S engines?  Thanks...

Title: Re: O S glo plugs
Post by: Fredvon4 on October 04, 2017, 01:54:39 PM

OS has the #6/ #7/ #8 and #10.... hot to cold

I only ever use the #8 for my 5% to 12% Nitro in the OS engines I have ---FPs and LA from .20 to .46

I have a few #7 Medium Hot that I have not used

Rule of thumb I was taught
The higher the nitro content, the colder the plug.

The hotter the day, the colder the plug.


But you really need several OS #80 in your stash....grin  Hey they are only a buck more
A 24K gold-plated edition of the popular #8 plug produced in honor of O.S.'s 80th anniversary, available for a limited time only!

Title: Re: O S glo plugs
Post by: Russell on October 04, 2017, 03:44:52 PM

OS 4C take Type F.  The OS 2C .46 I bought came with a #6.  The Brodak .049 works well with the #8.

Title: Re: O S glo plugs
Post by: Cody bishop on October 09, 2017, 02:20:33 PM

I use #6 exclusively

Title: Re: O S glo plugs
Post by: Steve Helmick on October 28, 2017, 05:59:25 PM

Have only used the ones that come with some of the OS LA engines..."A3", I think is what their designation is. Seem to work fine, but they're too $$$, and besides, I have lots of Thunderbolts in stock. When I tip over, the lucky widow will sell the Thunderbolts on ebay for $5 each, new in pack.  LL~ Steve

Title: Re: O S glo plugs
Post by: RandySmith on October 28, 2017, 07:52:57 PM

The Merlin 2004 HOT Big Bore  works well in OS engines

Randy