18mm plug adapters like EMC 289
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18mm plug adapters like EMC 289
It took a while longer than I thought. But if you are competing with old iron it might help you.
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Mummert Machine and Development 4 stroke hp
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Re: 18mm plug adapters like EMC 289
Where is the gain, getting the plug electrode deeper in the chamber?
Monty Frerichs
B&M Machine
B&M Machine
Re: 18mm plug adapters like EMC 289
Its a little bit of everything, deeper electrode, filling the hole outside the intake seat that causes fuel seperation, and .2 compression is nice.
Its looks amazing in an FE chamber, they suffer worse than 289's
Its looks amazing in an FE chamber, they suffer worse than 289's
Mummert Machine and Development 4 stroke hp
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Re: 18mm plug adapters like EMC 289
pm'd you
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Re: 18mm plug adapters like EMC 289
A much, MUCH better selection of available spark plugs.
I used to buy a similar product from "Garrett Machine" until they went out of business.
http://www.rmcompetition.com
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Specialty engine building at its finest.
Re: 18mm plug adapters like EMC 289
The 18m-to-14mm adapters which place the electrode in the original location have been around a hundred years. So this design advantage for FEs/SBFs come from placing the electrode 1/2" (approx) deeper in the chamber, plus increasing compression. If so, given some (23-degree SBCs) must index electrodes in the original location, which other designs would benefit and which can't fit?
At a guess, since our Studebaker and Packard V8s are 11-12 degree valve angle and would most likely have room for such an adapter.But if you are competing with old iron it might help you.
Jack Vines
Studebaker-Packard V8 Limited
Obsolete Engineering
Studebaker-Packard V8 Limited
Obsolete Engineering
Re: 18mm plug adapters like EMC 289
I think its safe to say that the are these are semi expiremental parts. The end user is responsible for clearances, tune up and parts inspection. Pretty normal for competition applications.
I think many older design could benefit from something like this, but many are not setup as well as the old Fords. The 18mm plug hole allows the part to have good wall thickness to help with the heat. Getting the electrode out the hole and more accessible to the mixture is a good thing to.
I think many older design could benefit from something like this, but many are not setup as well as the old Fords. The 18mm plug hole allows the part to have good wall thickness to help with the heat. Getting the electrode out the hole and more accessible to the mixture is a good thing to.
Mummert Machine and Development 4 stroke hp
Mummert Y-blocks
Mummert Y-blocks
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Re: 18mm plug adapters like EMC 289
So, are you planning on marketing them ...?Mummert wrote: ↑Sun Mar 26, 2023 3:47 am I think its safe to say that the are these are semi expiremental parts. The end user is responsible for clearances, tune up and parts inspection. Pretty normal for competition applications.
I think many older design could benefit from something like this, but many are not setup as well as the old Fords. The 18mm plug hole allows the part to have good wall thickness to help with the heat. Getting the electrode out the hole and more accessible to the mixture is a good thing to.
I think there is a market for them.
http://www.rmcompetition.com
Specialty engine building at its finest.
Specialty engine building at its finest.
Re: 18mm plug adapters like EMC 289
We had a small run of them made for guys who want to give them try.Walter R. Malik wrote: ↑Sun Mar 26, 2023 9:18 amSo, are you planning on marketing them ...?Mummert wrote: ↑Sun Mar 26, 2023 3:47 am I think its safe to say that the are these are semi expiremental parts. The end user is responsible for clearances, tune up and parts inspection. Pretty normal for competition applications.
I think many older design could benefit from something like this, but many are not setup as well as the old Fords. The 18mm plug hole allows the part to have good wall thickness to help with the heat. Getting the electrode out the hole and more accessible to the mixture is a good thing to.
I think there is a market for them.
Mummert Machine and Development 4 stroke hp
Mummert Y-blocks
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Re: 18mm plug adapters like EMC 289
Check my thinking on this. While moving the electrode with respect to the burn pattern affects the heat it sees, adding a mechanical joint between the head and plug body slows heat transfer, effectively making a given plug hotter. So more likely a colder rather than hotter?
Jack Vines
Studebaker-Packard V8 Limited
Obsolete Engineering
Studebaker-Packard V8 Limited
Obsolete Engineering
Re: 18mm plug adapters like EMC 289
I would start out pretty normal, I might consider running 1 step cooler.
Mummert Machine and Development 4 stroke hp
Mummert Y-blocks
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