Boobala Posted June 30, 2003 Share Posted June 30, 2003 http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=2421719447&category=46098 US $295.00!!! Quote Link to comment Share on other sites More sharing options...
Bluto Posted June 30, 2003 Share Posted June 30, 2003 Nice.... Quote Link to comment Share on other sites More sharing options...
Boobala Posted June 30, 2003 Author Share Posted June 30, 2003 I think they are nice, but a bit expensive. I also don't like the sharp, 90 degree cuts. In the aviation business we call those "stress risers," and after a few hundred hours of vibration I would not be suprised to see cracks develope in those areas. I think those areas should have been cut with a small radius in all the corners. Quote Link to comment Share on other sites More sharing options...
David K Posted June 30, 2003 Share Posted June 30, 2003 I think they are nice, but a bit expensive. I also don't like the sharp, 90 degree cuts. In the aviation business we call those "stress risers," and after a few hundred hours of vibration I would not be suprised to see cracks develope in those areas. I think those areas should have been cut with a small radius in all the corners. You are right, they should have been cut with rounded corners. The buyer could always do that themselves, but for $295, sheesh they should have been done right in the first place. Quote Link to comment Share on other sites More sharing options...
Guest ayobreezie Posted June 30, 2003 Share Posted June 30, 2003 Anyone else make these motor mounts? GOOD ones. I'll buy 'em if they're good quality and not $295. Haha. Quote Link to comment Share on other sites More sharing options...
BRAD D Posted July 1, 2003 Share Posted July 1, 2003 I think 295$ is a good price. I make them for 100$ but they are not as nice as that. Mine are welded with laser cut flanges and use the stock rubber mounts. ? Quote Link to comment Share on other sites More sharing options...
skyline240z Posted July 1, 2003 Share Posted July 1, 2003 Thanks, Brad, for backing me up, even though you're selling yours for considerably less. Boobala, are you an engineer or machinist? To make these mounts the way you want them for less than $250 would be an incredibly great deal ($250 is my reserve price, by the way), if you don't have to do the research and development work. I could do it the way you would like them done with all the radiuses and corners, but it would cost considerably more. I'm selling these because I made a few only, there's not a massive demand for these parts. I could sell them cheaper if I had hundreds of customers wanting these, so I could offset my costs (supply and demand I'm not trying to rip anyone off with that price, I think it's reasonable for the quality put into it. Oh yeah, these mounts do not bolt right onto the crossmember mounts of the car. They will bolt up to a pair of heavy duty rubber insulators, and from a machinist point of view, I don't think these mounts will crack over a few hundred hours, like you suggested. I've had mine for a few years now, and there is no wear and tear on them, because they are so thick in construction. If you can make these mounts for cheaper than $250, and the way you want them with all the radiuses, I'll buy them off you! Rick Quote Link to comment Share on other sites More sharing options...
stony Posted July 1, 2003 Share Posted July 1, 2003 aircraft stresses and car stresses are completly different. the thickness of those mounts will make them in detructable in a car. give me a break... there is now way in hell even a hi HP rb will break those Quote Link to comment Share on other sites More sharing options...
David K Posted July 1, 2003 Share Posted July 1, 2003 I failed to see the part about rubber insulators. Quote Link to comment Share on other sites More sharing options...
skyline240z Posted July 1, 2003 Share Posted July 1, 2003 Thanks, Stony, for backing me on this one too. Like Brad and Stony, they both have the RB26 motors in their Z's, they both know how much torque the motor puts out. To my experince as a machinist, I'm 100% sure that the frame will bend or break first before the mounts will ever crack. Thanks, Rick Quote Link to comment Share on other sites More sharing options...
BRAD D Posted July 1, 2003 Share Posted July 1, 2003 There are people running 400+ HP on L28 stock mounts and ther are thin stampeg steel Quote Link to comment Share on other sites More sharing options...
Jay1970Z Posted July 1, 2003 Share Posted July 1, 2003 Brad D and Stony are right, not crazy about the design, but they look well machined and damn sturdy to me and I don't think $295 is that bad of a deal. Hell, the riceboys pay up to $700 for mounts to put an H22A in a Civic. Quote Link to comment Share on other sites More sharing options...
RB26DETT Posted July 1, 2003 Share Posted July 1, 2003 Hi All, first off, hats off to Rick and Brad for making mounts available. I started to make them too, but all the fu#king around and bullc#ap that people were emailing me with, it was not worth the effort or time. Rick, your mounts will NOT break with a high HP RB26DETT. People should see the factory aluminium ones. Mine are modified factory aluminium ones and they are working fine even with a bigger ball-bearing Garrett turbo. I personally feel that there are too many dreamers and it is all to easy for people to judge others work/cars. Unless you have a better built RB26DETT zed then there is no room for negative comments! Cuong Nguyen Quote Link to comment Share on other sites More sharing options...
stony Posted July 1, 2003 Share Posted July 1, 2003 YEA!!!!!! Quote Link to comment Share on other sites More sharing options...
Schlasken Posted July 1, 2003 Share Posted July 1, 2003 i agree, there are too many dreamers, but it seems like everytime someone on this board says they going to do a rb26dett swap they get called off as unserious dreamers... i am planning my next project myself and it will definetly be a RB engine in it, but if its a rb25 or 26 is yet unsure... depends on what kind of money i can put in it. i dont even have an z yet, does that make me a dreamer? Sigurd Solberg Quote Link to comment Share on other sites More sharing options...
Boobala Posted July 1, 2003 Author Share Posted July 1, 2003 Let me quote my self.. I think they are nice[/size'], but a bit expensive.... I said "a bit expensive," not "overpriced" or a "ripoff," or anything remotely like it. I think the RB26DETT is a Nice motor, but it is a bit expensive. I think the LS1 is a Nice motor, but a bit expensive. I think that my DVD player is a nice DVD player, but it was a bit expensive. See the trend? I think it's great that you have made extra mounts, and are offering them to the world. That's why I posted them here! If I didn't like them I would have posted a "Hey look at these crappy, overpriced, sure to crack and destroy your Z, kill you and your dog RB mounts" thread. I am certified to Level II in Dye Penetrant, Eddy Current, & Mag Particle NDT (Non-Destructive Testing), and have well over a hundred hours in the classroom learning the various NDT methods and Metallurgical processes. I have well over 2000 total (documented) hours testing a wide varity of aircraft parts. Finding cracks is what I do. There is little differrence in automobile and aircraft stresses. In different areas on a aircraft the stress may be greater or less than those found in automobiles. In fact, most of the cracks I find are in low stress areas. It's not always the BIG stresses that cause cracks, it's the little, continuous stresses (vibration) that do the most damage. Rubber isolators will help a great deal in this area. I'm no machinist but looking at the part it seems it was cut with one type of cutting tool (bit), and it appears that the bit has flat tip and cuts with the side (flute?). It seems to me that by changing from the flat tip to something with a small radius (Ball End Mill?) on the tip would eliminate the 90 degree corners. In the above pic. you can see the very nice radius cuts. Any Stress will be evenly distrubted along the radius. Now look at the sharp interior corner. Here all the stress will be focused and is the most likely place for cracks to form. I'm not saying cracks will form, but if any do, this is where they will probably start. They are nice mounts and if I were in need of a pair, I certainly would not rule them out. Quote Link to comment Share on other sites More sharing options...
stony Posted July 2, 2003 Share Posted July 2, 2003 Yes.... call me when you have the motor ;> J/K Quote Link to comment Share on other sites More sharing options...
Boobala Posted July 2, 2003 Author Share Posted July 2, 2003 All Hybrids begin life as a dream. (I am one poetic MF) Quote Link to comment Share on other sites More sharing options...
Guest Zachb55 Posted July 2, 2003 Share Posted July 2, 2003 they deffinately look like the best, most reliable mounts ive seen, i would be more afraid for my rear end then the engine mounts breaking, every mount ive seen made would leave me fully satisfied, i dont think of this as a part that will undergo nearly as much stress as say a half-shaft or the differential will. -Zach Quote Link to comment Share on other sites More sharing options...
skyline240z Posted July 2, 2003 Share Posted July 2, 2003 Hi Boobala, If you are talking about mounts for a car versus an airplaine, they are two totally different things. I do make aircraft parts for Boeing and Bombardier, and the procedure to go through making a part is much more intense in papertrails (you know what I'm talking about) and making the part is again another thing. You have to find the right grain structure of the material for the best stress resistance and all radiuses must be put on in all corners and the part must go through a few stages of stress relief and shot penetration to release any levels of stress, and then go through x-rays or ultrasound in order to pass inpsection for an airplane. Now if you want all those levels to be done for a car, it could be done, but the price of the mounts would be over $1000 easily. But like you said, the rubber insulators will reduce most of the vibration of the motor already, so the corners will be okay. You are also right, ideally everything should be radiused, which I could do right now, and the center section will be thinner. Next time, I'll put a small radius in there to satisfy my toughest critics I'll try to post some more pics from other angles of the mounts soon. Rick Quote Link to comment Share on other sites More sharing options...
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