Royce Wise wrote:

This is an e-mail that came from another mailing. Thought some of you would be interested in it.
Hope you don't mind me forwarding this  Fred.
Royce

Fred Osborn wrote:

Tom Webber wrote:

I found a business in Texas that will make the bolts we need.  I need to now what type material to have them made out of, Stainless, Carbon steel,  Titanium,  Basically they told me on the phone they will make them out of what ever we want and they will roll the treads.  We need 17 per engine right, but two of these are longer.  So we are looking for 15 at 10mm X1.00mm X140mm and 2 at 10mm X 1.0mm X ?mm. How many of us are interested.  He said their is no minimum order.  I'm guessing the more we order the lower the price.  I don't have a quote yet.   They need a description of the part or a drawing.  Let me know guys.

Hi all,

Tom, is the business in TX the Martel Brothers ? If so, I think they are a dealer for Automotive Racing Products of Oxnard, CA. Royce put me onto their web site at: <www.arp-bolts.com>. A really great site, more than you could possibly ever want to know about fasteners, materials, installation, etc. They have bolts and studs in the size range we are interested in, in many different materials. It appears to me that their chrome moly 8740 would be an appropriate material.

You should get a quote from ARP Tom. I am really tied up with wife/daughter wedding plans. It has reached the point where I would pay almost any price to have them elope.

About lengths. When I was searching commercial web sites for metric bolts it appeared that the closest standard length we could use would be 140mm. I was planning to shorten these.

As close as I can measure it the thickness of an intermediate housing + a rotor housing =130.8mm. That would make the shorter bolts 128mm and the longer one 144mm. Someone else should check these measurements (I have been known to screw up). Do not overlook the possibility that ARP could have a metric stud that would do the job. Their bolts and studs are listed by auto engine type, not by dia. and length.

BTW, my engine uses 17 short and 1 long bolt. Also, someone in a ACRE message proposed designating our engines as 6.5B. I like that. If I ever get there mine will be either a Wankel 6.5BX or an ACRE 6.5BX.

Fred O.

I don't think the strength of the bolt has much to due with the problem.
Unless you change to titanium the resonant frequency of all the steel bolts
will be pretty much the same. RTV coated bolts or heat shrink tubing
around the bolts solves the problem by damping the resonant frequency.

Now if they get the price well down from $17 each that Mazda charges
that would be another matter entirely.

Paul Lamar

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