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#1
2nd September 2015, 11:03 PM
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bad knock on rear over the pot-holes
Hi all
I can not get rid of the knock on the rear suspension I have tried different setting of the shocks . I have got the right set for the car from Dampertech. This happens on bad pot holes, are the springs too short? 
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Regards Axle 
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#2
3rd September 2015, 01:24 PM
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Could be hitting the bump stop on full deflection ie full travel if springs are too short.
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Cost : Little as possible. Thanks : To those who by their generosity my build has progressed. Its a handmade sports car not a flaming kit car !!! If at first you dont succeed,avoid skydiving... No parachute require to freefall,only if you want to do it twice.
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#3
3rd September 2015, 10:04 PM
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Hi both
Thanks for looking into this, the rear springs are 225lb, I have tried the dampers at 10 turns and 20 turns as for the tyres pressure they are about 20lb at the back. as for your comment about the inner rim hitting the tarmac should I see any mark? I have tried the springs on various settings, but the knock is still there! I do appreciate what you are saying about the weight of the car and the design compare to a rally car, it is really the pot hole on the country road casing me this madness. Any more input into this will be great
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Regards Axle
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#4
4th September 2015, 11:15 AM
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Put tyre's up to 24/26 psi,I tried them low on race car I built and they try to roll off the rim in corners and squeal like hell .
__________________
Cost : Little as possible. Thanks : To those who by their generosity my build has progressed. Its a handmade sports car not a flaming kit car !!! If at first you dont succeed,avoid skydiving... No parachute require to freefall,only if you want to do it twice.
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#5
4th September 2015, 05:18 PM
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The back end of mine knocks when there is a sudden drop in the road surface, pot holes, coming off of speed bumps etc. I am running 225lb springs as well but only 3 or 4 clicks on the dampers.
I think the knocking on mine is when the wheel drops down, ie the shock fully extends as they do suffer with a lack of droop in the suspension. Maybe yours is similar.
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http://s831.photobucket.com/user/dav...ter%20Pictures OTR 01/05/14 - 1.6 CVH, Type 9, Bike Carbs, Megajolt
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#7
12th September 2015, 03:57 PM
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Results at last
Hi all
Just a short note to say : Firstly, thanks for your input I sorted other things as it was pointed to me while investigating this fault. Secondly, the knocking noise is gone the rubber that was on the spring shaft was not aqueduct enough to act as a pump stop I made one from some old bushes and fitted inside the spring. I am pleased to say it worked well and going over the potholes there was no knock was good proof! lastly you can fit the below as a substitute: https://www.google.co.uk/search?espv...oVChMI7-zjrcvx xwIVyGrbCh2MPQRf
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Regards Axle
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