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Post by Jess on Oct 23, 2010 15:28:03 GMT -5
Here is a cutaway section of an Re5 Rotor Housing to give a visual representation of the Spark plug and relation to the combustion event. There is an average distance from the hole to the electrode of .195". It has been my opinion that this distance, combined with the nature of Rotary engine mixture, makes for a foul sensitive plug. Attachments:
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Post by Jess on Oct 23, 2010 15:29:34 GMT -5
Here is a second photo from a different angle to give a better visual representation. In the photo you can see the electrode for the plug... (hopefully) Attachments:
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Post by Jess on Oct 23, 2010 15:33:06 GMT -5
There are several spark plug adaptors floating about on the internet. There was one fellow who was quite sucessful from Japan who machined a bunch of plug adaptors and sold a bunch. They were based on the "cutoff plug" principle. The idea was simple, Cut a A10EFP plug off, run a tap down the base to change the size to whatever plug suited you and you could get cheaply... Here is a photo of that design... Attachments:
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Post by Jess on Oct 23, 2010 15:34:24 GMT -5
Another photo... Attachments:
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Post by Jess on Oct 23, 2010 15:43:49 GMT -5
And another... Anyone notice any problems? 1. The plug adaptor seats all the way down in the motor. If it gets stuck... How the *&^% do you get it out? This one is notched, so that you can use a tool... Some are not. I have had three bikes come in with these stuck in them... Needless to say, it was a major distater to attempt to get them unstuck. One unlucky fellow wound up getting a new proper unit. Not good... 2. With all of the iterations I have seen, the plug reach of the "new plug" is even farther from the combustion event. Up to .200"... if you add that to what stock is, you are at .395" Which is, (in my humble opinion) a LONG way from the combustion event. Real frankly, some may have had good luck with this form of adaptor, but I just don't like them. Attachments:
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Post by Jess on Oct 23, 2010 15:55:56 GMT -5
I understand the supply of stock plugs is finite. I have discussed my thoughts and feelings about that issue on other parts of the board, so I won't rehash it here... Suffice it to say that having plugs made is not cost effective for me to do now. Maybe in the future, but now... NO WAY! I understand that plug adaptors are an inevitibility. With that in mind, here is my solution. This is the adaptor I have designed and had made. I have tested it on the road in one of the test bikes for several thousand miles and it has performed quite well. I have not experianced a fouling event at all. Let me say however, when an Re5 is properly set up and maintained, I find it very rare that standard plugs fail. Attachments:
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Post by Jess on Oct 23, 2010 16:00:40 GMT -5
Here is a photo of how I believe I solved problem Number 1. The adaptor has a large Hex Head so that a wrench can be put on the unit to remove it all from the engine. Attachments:
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Post by Jess on Oct 23, 2010 16:02:54 GMT -5
Here is a photo to illustrate how I believe I have solved problem 2. My adaptor moves the electrode to within .095" of the combustion event. I hope that this will prevent fouling. Attachments:
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Post by Jess on Oct 23, 2010 16:04:28 GMT -5
The adaptors are made from 303 stainless steel. All threads should be coated with anti seize before assembly.
They use an NGK LMAR9E-J which is a readily available plug in the US. The plugs cost about 12.00 each.
The adaptor will cost $100.00 plus shipping. They are ready and available for delivery. They are currently in production and are used in the 2010 Yamaha R1... So they should be available for quite some time.
I welcome comments and thoughts...
Best regards,
Jess
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Post by ziggystardust on Oct 23, 2010 19:21:45 GMT -5
I'm pleased that the adaptor from Rotary Recycle is finally available, looking at the design it appears to be well thought out and produced to a high standard.
I'll also add that I think the cost is also very fair and would expect it to sell well as original RE5 plugs dry up.
Lee
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Post by pollorey on Oct 25, 2010 19:09:17 GMT -5
Why is removal of the adapter such a concern? If the adapter is stuck in, just replace the plug (what aftermarket thread inserts are attempting to do on damaged spark plug threads in cylinder heads...make sure the insets do not come out). If the adapter is stuck to the plug, it will come out with the plug. If the plug and the adapter are stuck, a problem! But could happen any time, no?
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Post by mike500 on Oct 25, 2010 19:16:59 GMT -5
i had a stock plug shear off in my re5 lucky i was able to get it out useing an easy out taking my time otherwise it would have been engine out and have to set it up on a spark eroder very costly
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Post by pmcburney on Oct 26, 2010 19:49:16 GMT -5
The adaptors are made from 303 stainless steel. All threads should be coated with anti seize before assembly. They use an NGK LMAR9E-J which is a readily available plug in the US. The plugs cost about 12.00 each. The adaptor will cost $100.00 plus shipping. They are ready and available for delivery. They are currently in production and are used in the 2010 Yamaha R1... So they should be available for quite some time. I welcome comments and thoughts... Best regards, Jess Jess, Can an order be placed for an adaptor from you as of now? I would very much like to use one in my bike and I will certainly order one. Not that I'm experiencing any difficulties with a standard plug, but I can see the writing on the wall, plus the range of plugs available to work with such an adaptor is possibly far greater than the range of standard plugs. I intend doing some carb experiments shortly and if I'm unable to jet the carb I intend to use absolutely correctly (and I end up consequently fouling a standard plug), at least with this adaptor I can 'plug' the bike to suit if needs be. I can post pics and info about what I intend to do if folk are interested (about the carb, that is...). Thanks Paul McB Australia |
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Post by Jess on Oct 27, 2010 7:36:49 GMT -5
Paul,
Just send Barbara all your info at RotaryRecycle@gmail.com and she will get you fixed up...
Best,
Jess
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FC Zach
3rd Gear
Eagleville, TN
Posts: 335
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Post by FC Zach on Oct 28, 2010 23:28:01 GMT -5
Very nice and detailed write-up Jess! Good work as always.
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