Ive also posted this in the transmission section but thought id put a link here in case some of you guys didnt see it.

Link to other post

[Edited on 20/5/08 by ChrisS]

re read your post
sorry

[Edited on 7/5/08 by eccsmk]

Well thats what i thought and what i was also advised. So last wek it was rebuilt at Road and Race Transmissions.

Dit it fix it. Did it B......s

is it a trt prop??

Its not a TRT prop, but i dont think a TRT sould stop this noise do you? The guys at the BEC centre listened to the video and they dont reckon that TRT would resolve this either.

im going to ask a couple of mates to listen as well im sure someone can tell you what it is mate

sorry it still sounds like the prop is exegerating a small noise from either the diff or the engine

i hope you find a cure ill prob add to your other post later

[Edited on 7/5/08 by eccsmk]

Its tricky to pinpoint as the camera seems to make everything sound very tinny (judging by the gearchange noise) but excessive backlash in the diff is my bet. You only seem to get the noise at higher speed and when on part / neutral throttle which is when the gears will clatter if there's too much backlash. Under hard accleration or deceleration, the gears are forced together by the engine forces, so don't clatter.

[Edited on 7/5/08 by ChrisGamlin]

The back lash in the diff was all setup properly less than 50 miles ago by road and race transmissions, as part of the £175 rebuild. Im told the backlash should be expected. Actually the noise in the video is worse at higher speed Decelaration.

But because ive already had the diff rebuilt i wasnt expecting to have to replace the diff as part of the fault finding.

I know its difficult to hear as you say but the noise really seems to be coming from the engine end now ove taken the tunnel top off, whereas before it seemed to come from the diff, but i guess thats cause the noise was travelling backwards.

Still baffled!

Unlikely to be the diff then I wouldnt think, there's always an amount of backlash in the diff but its not usually audible unless its excessive. The prop adapter hasnt come loose has it, and when done up it clamps up tight rather than sliding on the splines slightly I assume?

[Edited on 7/5/08 by ChrisGamlin]

Beat you to it on the other thread Chris .lol

Any thoughts on what the effect of a knackered output shaft bearing on the bike may do?

There doesnt seem to be any play onthe output shaft by levering the sprocket adapter?

This afternoon ive managed to get the prop off the car and. I thought id start the car and run it through the gears as there was nothing connected to the prop adapter.

Strange thing is that as soon as i release the clutch without any throttle applied i get this strange clank clank clank, and then when you press the loud pedal it seems to disappear. Ill do a video later, but was wondering if i should be hearing any clanky noises at all, throttle or no throttle? Is it just the slack in the gears meshing together?

Will post vid later.

Thanks

Turns out that this was all due to 2 knackered UJ's on the rear section of the prop, and the fact that the entire prop including the "new" front section was completely unbalanced

I find it hard to believe that you can buy a prop from a reputable company and have such problems with it, believing that what youve been supplied surely couldnt be the problem.


Anyway at least the car is now driving as it should be.


Thanks for everyones help, especialy those who suggested a prop balance.

Chris

Blimey thats not good, I assume it was a cut n shut job rather than a custom made prop specifically for your car?

No not a cut and shut job actually. The entire prop was supplied by MK Engineering.

The guys at the engineering place who fixed it, said that there was no way the prop could have been balanced as the UJ's were so knackered, and whats more the front section was never balanced at all.

Ill be the last one to slag off anyones work, but im pretty certain i have good reason to in this case.

As far as props go MK and i have a poor record. The first one they supplied, had a bent rear section.

The second one, the current one has knackered UJ's, and is basicslly unfit for use as supplied, and whats more when i asked the guy at MK who makes them to help out, he didnt sound too interested, and kind of wanted to blame it on something else with the car.

Basically i think what they do is rip the prop off of a donor, modify the front section and sell it, unbalanced, unchecked for worthiness, and the annoying thing is they wanted an exchange unit, which i know was perfectly good.

But hey, what can be done about it now, probably nothing.

at least you now know the cause of the noise
i will be checking mine out
ATB

quote:

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Originally posted by chris mason
was it supplied by Mk Sportscars or Mk Engineering, they are 2 different companies, from reading the post it seems you bought it from Mk sportscars.

Chris

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quote:

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I find it hard to believe that you can buy a prop from a reputable company and have such problems with it, believing that what youve been supplied surely couldnt be the problem.

---

No. MK make cars and components i.e. chassis, bodywork, wishbones and propshafts. It's there advertised on their website. They are offering a propshaft service and so the item should be fit for purpose really. Even if they don't make the item, for example the exhaust manifold. It's sold through them and so they have a duty of quality care. Anyhow Tesco sells bog rolls but they don't rename themselves 'Tesco Boggies'!

Not taking sides but generaly the rear part is std sierra ( no work done on it ) the work comes in the front section, I generally send just the front section to have modified, anyway glad you found the cause
tony

I guess that's why my Bailey Morris shafts were 'reassuringly expensive' (pity ASDA don't do shafts as well as beer).

Another shout for Bailey Morris. Great company to deal with and the product is top quality