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Post by Brendan69 on Nov 16, 2018 15:46:20 GMT
Forgive me as im only new here but its rather quiet. Is this the norm???
Regards,
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Post by barryr on Nov 16, 2018 17:04:18 GMT
It can be - there are flurries!,
I quite like it as opposed to the instant on type nature of the Facebook page - each has its merits and drawbacks of course.
Welcome anyway!,
Barry
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Post by Brendan69 on Nov 17, 2018 15:24:15 GMT
Cheers Barryr. I don't do FB. Horrible place.
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Post by dhb5610 on Nov 17, 2018 15:41:28 GMT
As a user of both I agree they both have there merits The Rover P5 appreciation society are a pretty helpful and friendly bunch
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Post by enigmas on Nov 18, 2018 22:36:51 GMT
Forgive me as im only new here but its rather quiet. Is this the norm??? Regards, Hi Brendan69, I post my thoughts/tech advice for what it's worth quite regularly and have done so for many years on this forum. As I reside in OZ I'm not a member of the Club in the UK (for obvious reasons) but welcome the open opportunity to post here regularly. I don't toe any 'company' or peer pressured line and post tech related stuff that I have done and have knowledge of. Some on the forum may find what I post usedful and interesting and others may find it not to their taste, but it usually initiates discussion. Several topics that have brought about vigorous discussion include: Modifications, Contrasonics suspension mounts, Front Subframe isolation mounts and BW35 transmission Fluid, a hot and slippery topic...pun intended! The point is, if it's quiet then post something, a tech tip, an idea or an opinion and I'm sure a response will follow...it may not be what you want but it will appear...as has this response. Vince (aka. enigmas)
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Post by enigmas on Nov 18, 2018 22:59:09 GMT
As a user of both I agree they both have there merits The Rover P5 appreciation society are a pretty helpful and friendly bunch The Contrasonic discussion didn't go down too well! There's an individual selling isolation mounts as replacement bushes as viable rear shackle mounts for the P5 rear leaf spring suspension on the Rover Appreciation Society. I have no issues with the individual selling the bushes as 'isolation mounts' but I do strongly have an issue with them being advertised as viable replacements for the original contrasonic bushes that were purposely engineered for the P5 (for specific technical reasons) There's is definitely a need to remanufacture these bushes in their original engineered specification for the P5. The RCC in OZ remanufactured the front subframe bushes a number of years ago for similar reasons. So this may be a good topic starter.
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Post by Deleted on Nov 20, 2018 8:46:57 GMT
The 'mounts' referred to are bobbin type engine mounts. They might do the job sort of but they are not designed to do the job the originals were designed to do,which is (amongst other things) to alter the spring rate. The 'contra' part of the name refers to the way they oppose the springs action to achieve this. They aren't replacements,just a work round.I would want to see the design specs and ratings before using them.
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Post by enigmas on Nov 20, 2018 9:08:12 GMT
The 'mounts' referred to are bobbin type engine mounts. They might do the job sort of but they are not designed to do the job the originals were designed to do,which is (amongst other things) to alter the spring rate. The 'contra' part of the name refers to the way they oppose the springs action to achieve this. They aren't replacements,just a work round.I would want to see the design specs and ratings before using them. Kev...I believe he saw your technical comment as an endorsement of the 'mounts' he's selling! The company that manufactures those mounts and others (Mackay) is literally 5 mins from my home. His markup is quite excessive...but some P5 owners are desperate and will clutch at straws. It's an easy earner!
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Post by johnwp5bcoupe on Nov 20, 2018 13:00:13 GMT
The 'mounts' referred to are bobbin type engine mounts. They might do the job sort of but they are not designed to do the job the originals were designed to do,which is (amongst other things) to alter the spring rate. The 'contra' part of the name refers to the way they oppose the springs action to achieve this. They aren't replacements,just a work round.I would want to see the design specs and ratings before using them. Kev...I believe he saw your technical comment as an endorsement of the 'mounts' he's selling! The company that manufactures those mounts and others (Mackay) is literally 5 mins from my home. His markup is quite excessive...but some P5 owners are desperate and will clutch at straws. It's an easy earner! They don't seem to list them Vince.
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Post by enigmas on Nov 20, 2018 13:59:47 GMT
Kev...I believe he saw your technical comment as an endorsement of the 'mounts' he's selling! The company that manufactures those mounts and others (Mackay) is literally 5 mins from my home. His markup is quite excessive...but some P5 owners are desperate and will clutch at straws. It's an easy earner! They don't seem to list them Vince. Hi John, Here's a link to their PDFs (at the bottom of the page in fluorescent green) Page 4 of 179 in their Engine Mount catalogue www.superformance.com.au/b/mackay
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Post by johnwp5bcoupe on Nov 20, 2018 16:07:25 GMT
They don't seem to list them Vince. Hi John, Here's a link to their PDFs (at the bottom of the page in fluorescent green) Page 4 of 179 in their Engine Mount catalogue www.superformance.com.au/b/mackayThanks for the info so they are just normal Bobbins Vince
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Post by Warwick on Nov 22, 2018 10:24:09 GMT
... The 'contra' part of the name refers to the way they oppose the springs action to achieve this. ... I've always understood the name to mean contra (against) and sonic (sound). The manufacturer's attempt at a fancy name for a sound or vibration absorbing mount between the suspension and the body, to an extent not usually provided by conventional leaf-spring shackles. I believe Rover was concerned that their traditional buyers would (might) see the change to the new-fangled monocoque construction, favoured by lesser marques, as resulting in reduced ride quietness. So they added (in my opinion) the unnecessary subframe isolators and the Contrasonic mounts. Then when Sir Wilfred Scoftington-Smythe was looking to replace his nephew's P4, the salesman could point underneath to those components and authoritatively state that there can be no loss of ride quality by changing to a modern body shell construction method, as it is still isolated from the road by rubber mounts.
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Post by Deleted on Nov 24, 2018 19:06:20 GMT
Somewhere I have a book that gives an explamation etc on other applicatios for these contraptions but another explanation of the principles is given in Automotive Design Analysis by John Fenton 2013 pages 257 to 259. There is a link below but it might not work as Im embracing new tecnology on my phone as i have no access to a computer at the moment.....https://books.google.co.uk/books?id=U7EgBQAAQBAJ&pg=PA257&lpg=PA257&dq=contrasonic+mounting&source=bl&ots=F5F6Xf6_a2&sig=5074aVgaJVpKDtYoc6bGxuCMvoI&hl=en&sa=X&ved=2ahUKEwiT64bw2u3eAhXJCcAKHecBDRYQ6AEwD3oECAUQAQ
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Post by Warwick on Nov 25, 2018 4:02:59 GMT
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Post by Deleted on Nov 25, 2018 10:12:11 GMT
They seem not to have worked well enough to have become popular. I remember reading in an old magazine about an axle,with shock absorbers removed that swung down with the car on a wheels free lift. Scary!
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