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Post  riehlflyer on Mon Mar 30, 2020 10:00 am

How do you identify the hi compression glow heads? Do they always have radial marks?
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Post  smooth_bill on Mon Mar 30, 2020 3:11 pm

Cox International in Canada had plugs with no Knurling for a while. Apparently they didn't go over too well, so later batches resumed the knurling,

All hi-compression plugs have the Trumpet shaped combustion chamber. Photos of both examples are on the Internet, and in some model forums.
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Post  roddie on Mon Mar 30, 2020 3:58 pm

riehlflyer wrote:How do you identify the hi compression glow heads? Do they always have radial marks?

Ditto Smooth Bill. I've heard that they may not always have those distinctive radial-marks on the top. If you have a "suspect" head; compare its combustion-chamber area with that of a standard glowhead. A high-compression head has a noticeably "reduced" area.

Here's a photo..

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Note the #1702 which is a high-compression head. The "lower-row" shows the differences in combustion-areas between the different head types.

Cox also produced what's known as the "W-filament" head.. which is merely a standard head.. with a W-shape filament/element.
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Post  Jason_WI on Mon Mar 30, 2020 4:25 pm

There is a single fin glow head for the GTP nissan, stocker, and Indy cars.

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Post  66 Malibu on Mon Mar 30, 2020 5:40 pm

FYI,
About 10 years ago, I bought 5 each Texaco 5 fin heads from Dan Sitter (California Dan) on eBay at a decent ( Now) price.
When I received the 5 fin heads, they all had the knurled ring on top and all 5 had the 1702 high compression combustion chamber!!
Dan had about 50 to start with but sold all in about one day.
Since he had access to all things Cox, I have wondered if they were factory experimental and he accidentally sold them without noticing the difference.
Have also wondered if they were especially for Texaco events at higher elevation events ?
If anyone knows please advise..
Steve....
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Post  smooth_bill on Mon Mar 30, 2020 7:20 pm

Interesting thread.

I did not know about those car plugs! Sure hope I can recall all that in the future.

So if I got this right there was both a 5 fin and single fin high compression plug.

I'll have to look for the ones I ordered from Bernie, as that was some time ago.

Bill

Just looked in my stash and found the only plugs I have from Bernie are knurled! My befuddled brain lied to me again!
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Post  Cox International on Wed Apr 01, 2020 3:24 pm

smooth_bill wrote:Cox International in Canada had plugs with no Knurling for a while. Apparently they didn't go over too well, so later batches resumed the knurling,

All hi-compression plugs have the Trumpet shaped combustion chamber. Photos of both examples are on the Internet, and in some model forums.

CLARIFICATION Smile

We have been manufacturing the TD glow heads without a knurl for about a decade; omitting the knurl for cost reasons (would have added a buck to the retail price). Not only did they go over very well but they were actually amongst our very top sellers.

It is just that we sold out of them and new production was delayed due to the China manufacturing shutdown. Our competitor Matt had previously gotten some made with the knurl and we borrowed a few hundred to tie us over.

Now that China is back at work again, we have ordered 1,000 units and should have them here early May (again, without the knurl).
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Post  Admin on Wed Apr 01, 2020 4:13 pm

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