The knock is back!
Discussion
So after having the v8 developments cam kit installed everything was all running peachy. I'm now 600 miles in and the knock has returned. It strange as it is not there all of the time. When I start the engine the knock starts once it hits about 50 degrees, it tends to go once the engine is around 85 degrees (indicated)
Now today from a cold start (after 10 days of being in my garage) the knock was nowhere to be seen, happy days eh. That was a 12 mile run. After three hours of standing I make my way home, no tick again on warm up at all. The engine seems to be sitting at around 85 degrees the. After a 7 mile run down the a50 it drops to 70 degrees and the knock returns!
It really sounds like a sticky lifter again, but this should not be so really?! any ideas gents?
I have noticed the the engine temperature seems to be all over the place, I know that's how they all are really but it seems to be worse of recent. Could it be new thermostat time?
Now today from a cold start (after 10 days of being in my garage) the knock was nowhere to be seen, happy days eh. That was a 12 mile run. After three hours of standing I make my way home, no tick again on warm up at all. The engine seems to be sitting at around 85 degrees the. After a 7 mile run down the a50 it drops to 70 degrees and the knock returns!
It really sounds like a sticky lifter again, but this should not be so really?! any ideas gents?
I have noticed the the engine temperature seems to be all over the place, I know that's how they all are really but it seems to be worse of recent. Could it be new thermostat time?
The below link is when the noise kicks in at 50 degrees:
https://www.youtube.com/watch?v=q9JZNv2jjGk
I restarted the engine and the noise simply eases up and stops:
https://www.youtube.com/watch?v=MS9NJ1ANYwc
https://www.youtube.com/watch?v=q9JZNv2jjGk
I restarted the engine and the noise simply eases up and stops:
https://www.youtube.com/watch?v=MS9NJ1ANYwc
QBee said:
Your theory may well be correct. Never assume new parts solve a problem.
It is highly unlikely that the followers/lifters - the part between the cam lobe and the push rod - are made by V8D themselves. Certainly Kent Cams buy theirs in from outside. Kent have recently had a batch which were not hardened correctly. I personally know of two TVR experts who have discovered this problem the hard way, with the followers failing within 20 miles in one case, under 100 in another and in a matter of weeks in the other cases.
The faulty non-hardened follower head in contact with the cam spreads out (a bit like if you repeatedly hammer a piece of soft metal) and then won't pass up the tube in which it fits snugly. It sticks, damaging the cam.
I saw the sub-100 mile cam and followers - I helped to strip it down. The followers normally lift out upwards. To get them out, the faulty ones had to be pushed downwards after removing the camshaft.
I suggest you call Rob and then take the car to him and ask him to listen. Give him this explanation and ask him to call me (Anthony Bristow) or the guy who looks after my car (he knows who that is) if he wants more info. If he cannot remember me, I was the guy who he kindly helped when three of my brand new plug extenders were supplied faulty by a major TVR parts supplier. Not their fault.....bad manufacture. Rob built my 5 litre engine.
I may well be barking up the wrong tree, but it fits with you having had a recent new cam. It is NOT V8D's fault. They will just have taken a pack of 16 new followers and popped them into your engine.
I'm a log way away from them unfortunately! I ordered over the phone and had my local (ish) tvr independent fit itIt is highly unlikely that the followers/lifters - the part between the cam lobe and the push rod - are made by V8D themselves. Certainly Kent Cams buy theirs in from outside. Kent have recently had a batch which were not hardened correctly. I personally know of two TVR experts who have discovered this problem the hard way, with the followers failing within 20 miles in one case, under 100 in another and in a matter of weeks in the other cases.
The faulty non-hardened follower head in contact with the cam spreads out (a bit like if you repeatedly hammer a piece of soft metal) and then won't pass up the tube in which it fits snugly. It sticks, damaging the cam.
I saw the sub-100 mile cam and followers - I helped to strip it down. The followers normally lift out upwards. To get them out, the faulty ones had to be pushed downwards after removing the camshaft.
I suggest you call Rob and then take the car to him and ask him to listen. Give him this explanation and ask him to call me (Anthony Bristow) or the guy who looks after my car (he knows who that is) if he wants more info. If he cannot remember me, I was the guy who he kindly helped when three of my brand new plug extenders were supplied faulty by a major TVR parts supplier. Not their fault.....bad manufacture. Rob built my 5 litre engine.
I may well be barking up the wrong tree, but it fits with you having had a recent new cam. It is NOT V8D's fault. They will just have taken a pack of 16 new followers and popped them into your engine.
Edited by QBee on Monday 25th May 19:21
Proper Stokey said:
Hi Matt,
Have you got to the bottom of the knock?? I had a word with a friend of mine who is a bit of a guru with Rover V8's and works on them day in day out, he had a couple of ideas but the sound on my computer at work isn't the best.
Jase.
Hi JaseHave you got to the bottom of the knock?? I had a word with a friend of mine who is a bit of a guru with Rover V8's and works on them day in day out, he had a couple of ideas but the sound on my computer at work isn't the best.
Jase.
Not yet no, I would be very grateful for his advice!
I thought a quick update was in order as everything has been working perfectly for a couple of months now. There was a loose nut from the oil sifter, looks like it was enough to drop the oil pressure slightly now and them and put a lifter out. That was tightened up and hey presto prefect running engine. Always rule out the basics is the lesson learnt!
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