BS5620 Posted November 8, 2008 Share Posted November 8, 2008 Hello Putting a new engine in my cortina. Do your engine mounts have to come off the engine x-member for certs?? Was thinking of having them come off the two side chassis rails that are in the engine bay. Would this get certed???? Quote Link to comment Share on other sites More sharing options...
slayer00 Posted November 8, 2008 Share Posted November 8, 2008 Should do, my audi engine is mounted from the chassis rail Quote Link to comment Share on other sites More sharing options...
escorted Posted November 8, 2008 Share Posted November 8, 2008 If you are in Auckland the best guy to call/talk to is neil fraser of fraser cars. He is friendly and gives direction freely Quote Link to comment Share on other sites More sharing options...
QCADTA Posted November 8, 2008 Share Posted November 8, 2008 Should be fine. read this, all is explained. http://www.lvvta.org.nz/ Quote Link to comment Share on other sites More sharing options...
RUNAMUCK Posted November 8, 2008 Share Posted November 8, 2008 My mate has a VG30eT powered datsun 1600. His mounts are welded to the chassis rails. I've seen a few rotor conversions done the same way. Quote Link to comment Share on other sites More sharing options...
mikuni Posted November 8, 2008 Share Posted November 8, 2008 In most cases this is far more structurally sound than coming off the crossmember. In higher horsepower chevette/gemini/kadett builds its recommended to mount to the rails instead. A good mechanical engineer will know this, so certing shouldn't be a problem proving it is done well and the old mounting points are removed/tidied up in some way. That said, for changes like this always talk directly to the person (or people) that will be certifying the vehicle. The last thing you want is internet advice resulting in you having to change the way the engine is mounted to please a fussy certifier. Quote Link to comment Share on other sites More sharing options...
Requiemk Posted November 8, 2008 Share Posted November 8, 2008 on the same note, if i wanted to mount my engine back closer to the firewall could i just wled across some new mounts back from the crossmember? second picture would just be box section welded across and mounts welded onto that. I think not a its not supported by anything/i don't no much on welding/anything. Quote Link to comment Share on other sites More sharing options...
mikuni Posted November 8, 2008 Share Posted November 8, 2008 on the same note, if i wanted to mount my engine back closer to the firewall could i just wled across some new mounts back from the crossmember? second picture would just be box section welded across and mounts welded onto that. I think not a its not supported by anything/i don't no much on welding/anything. I don't think that would be sweet aye. It would be hard to come up with a better plan without having the engine and bay in front of me though. What you are suggesting would create a pivot point on the xmember and uneven loading on the bolts and mounting points, rather than the normal load conditions. That is if I understand the way you are thinking of mounting it. I think you would be far better to try and mount to the chassis rails if possible and if not perhaps try and modify the way the mounts bolt to the engine block itself, rather than the xmember. Quote Link to comment Share on other sites More sharing options...
sentra Posted November 8, 2008 Share Posted November 8, 2008 as funny looking as it is, people do do it. (to an extent, like 6" ish) i dont know the deal with welding to the rails but if ur bolting to them take a million pictures of you putting crush tubes in cause to proove there there to the cert man once the motors in is a mega pita. /as brrrad said ring the dude and stop listinign to hungover sentra giving u advicce on the e-net 1 Quote Link to comment Share on other sites More sharing options...
Requiemk Posted November 8, 2008 Share Posted November 8, 2008 on the same note, if i wanted to mount my engine back closer to the firewall could i just wled across some new mounts back from the crossmember? second picture would just be box section welded across and mounts welded onto that. I think not a its not supported by anything/i don't no much on welding/anything. I don't think that would be sweet aye. It would be hard to come up with a better plan without having the engine and bay in front of me though. What you are suggesting would create a pivot point on the xmember and uneven loading on the bolts and mounting points, rather than the normal load conditions. That is if I understand the way you are thinking of mounting it. I think you would be far better to try and mount to the chassis rails if possible and if not perhaps try and modify the way the mounts bolt to the engine block itself, rather than the xmember. I was thinking uneven load all stress will be on the bolts as well. The picture seems to show a bit more extreme mounting, 4-5 inchs max. I couldn't think of another way without new crossmember or mounted to engine as well. I just print this page off and when comes cert time will show them this "na its alright the Internet told me" Quote Link to comment Share on other sites More sharing options...
Gaz Posted November 9, 2008 Share Posted November 9, 2008 What you wanna do Requiemk626 is sweet. I did it in my Cortina and I have a cert. Used 6mm plate and its moved engine about 3-5inch. Gaz Quote Link to comment Share on other sites More sharing options...
Requiemk Posted November 9, 2008 Share Posted November 9, 2008 sweet! to confirm: Quote Link to comment Share on other sites More sharing options...
Gaz Posted November 9, 2008 Share Posted November 9, 2008 yup yup Quote Link to comment Share on other sites More sharing options...
Seedy Al Posted November 9, 2008 Share Posted November 9, 2008 Maybe run a small section of 6 mill out to the end of the plate on its end to confirm some strenth in it.... Anyway, looks all sweet, thats pretty much how the daisy van was done Allan Quote Link to comment Share on other sites More sharing options...
BS5620 Posted November 11, 2008 Author Share Posted November 11, 2008 cheers for all the replys. talked to cert guy, no prob to weld to chassis rails can even bolt them on if you put in crush tubes that are over 3mm thick Quote Link to comment Share on other sites More sharing options...
mikuni Posted November 11, 2008 Share Posted November 11, 2008 Maybe run a small section of 6 mill out to the end of the plate on its end to confirm some strenth in it.... I don't think the issue would be strength in the plates themselves, just the twisting moment on the xmember and the additional stresses applied to the mounting points/bolts but he's talking only 75-100mm, which is less than I thought, so perhaps it won't cause any issues. Quote Link to comment Share on other sites More sharing options...
Jase Posted November 14, 2008 Share Posted November 14, 2008 Maybe run a small section of 6 mill out to the end of the plate on its end to confirm some strenth in it.... I don't think the issue would be strength in the plates themselves, just the twisting moment on the xmember and the additional stresses applied to the mounting points/bolts but he's talking only 75-100mm, which is less than I thought, so perhaps it won't cause any issues. speaks the truth hear bud your x member already has to deal with the transfer of mass from braking due to the forces exerted it through the suspension and in the opposite direction from the cars mass the body of the car will also pitch downwards and your engine will try and continue its horizontal path thus twisting your x member clockwise towards the front of the car. If you do not do your calculations properly you could find you rip the x member out or crack mounts etc under heavy braking, key is to overengineer everything or allow for failure Quote Link to comment Share on other sites More sharing options...
Guest vvega Posted November 14, 2008 Share Posted November 14, 2008 engine in in shear underbraking .... clockwise would put the engine mount bolts in tension = not ok they solve this from the factory by installing a cross member to the gearbox to support the box and stop tension forces buy limiting the lifting of the rear of the box/motor personally i would box it in looks well under engineered to me for cert ... IMO Quote Link to comment Share on other sites More sharing options...
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