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Glow plug adapter need more gaskets?

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Glow plug adapter need more gaskets?

Post  Levent Suberk on Sat Mar 03, 2018 5:09 pm

Cox threaded glow plug adapter for No.8 glow plugs has two fins instead of three fins on 325 glow head. This adapter require two or more head gaskets instead of one?
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Re: Glow plug adapter need more gaskets?

Post  Levent Suberk on Sun Mar 04, 2018 8:24 am

Problem solved.
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Re: Glow plug adapter need more gaskets?

Post  Levent Suberk on Sun Mar 04, 2018 10:41 am

Well, threaded adapter for Cox engines do not need any extra gasket. I realized that the head shape and element cavity of threaded adapter with a OS No.8 glow plug are different from standard 325 glow head. So this changes the volume and lowers compression.
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Re: Glow plug adapter need more gaskets?

Post  Surfer_kris on Sun Mar 04, 2018 11:00 am

Yes, the compression ratio is usually lower than on the stock heads. Plus, the threads of the regular plug becomes a part of the combustion chamber and the power is usually well down from the OEM heads. If you have access to a lathe you can shave off a bit of material from the sealing surface of the head and gain some compression back. That plus sealing the threads of the regular plug with a silicon sealant can give you some of the power back, but never quite as much as with the OEM heads.

There is a great read on the topic here; RCU

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Re: Glow plug adapter need more gaskets?

Post  Levent Suberk on Sun Mar 04, 2018 11:24 am

Surfer_kris wrote:Plus, the threads of the regular plug becomes a part of the combustion chamber and the power is usually well down from the OEM heads.

I didn't know this. Thanks!
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