The knock is back!

The knock is back!

Author
Discussion

Matt99man

Original Poster:

384 posts

266 months

Monday 25th May 2015
quotequote all
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?

QBee

20,904 posts

143 months

Monday 25th May 2015
quotequote all
What model of cam is it?

Matt99man

Original Poster:

384 posts

266 months

Monday 25th May 2015
quotequote all
It's the MC1 cam

SILICONEKID345HP

14,997 posts

230 months

Monday 25th May 2015
quotequote all
85 degrees on the gauge will be over 100 in reality .

Is it when the engine is on load ?

QBee

20,904 posts

143 months

Monday 25th May 2015
quotequote all
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.

Edited by QBee on Monday 25th May 19:21

PH430

147 posts

127 months

Monday 25th May 2015
quotequote all
I had a same issu. My engine had one cylinder on the left site that was on detonation. When the engine get hot, detonation is on higher risk. It is also posible on idle.

Skyedriver

17,661 posts

281 months

Monday 25th May 2015
quotequote all
Sorry, bit of a thread hijack but left side / right side?
A friend is putting together a Rover V8 and the pistons/rods are supposed to go in with a mark on the rod pointing a particular way on the right bank and the opposite way on the left bank.
We stood there this afternoon trying to decide if that was looking from the drivers seat or from the front of the engine....

phazed

21,844 posts

203 months

Monday 25th May 2015
quotequote all
Skyedriver said:
Sorry, bit of a thread hijack but left side / right side?
A friend is putting together a Rover V8 and the pistons/rods are supposed to go in with a mark on the rod pointing a particular way on the right bank and the opposite way on the left bank.
We stood there this afternoon trying to decide if that was looking from the drivers seat or from the front of the engine....
They only fit properly one way.

It's quite obvious really when you see one together., they sort of mirror each other.


phazed

21,844 posts

203 months

Monday 25th May 2015
quotequote all

Skyedriver said:
Sorry, bit of a thread hijack but left side / right side?
A friend is putting together a Rover V8 and the pistons/rods are supposed to go in with a mark on the rod pointing a particular way on the right bank and the opposite way on the left bank.
We stood there this afternoon trying to decide if that was looking from the drivers seat or from the front of the engine....
Look at the third pair of rods and you can see a small casting protrusion on the end of the caps.

They are pointing one left and one right, meeting in the middle it swim.

http://www.v8engines.com/ebaypictures/engines/cos-...

J400GED

1,202 posts

236 months

Tuesday 26th May 2015
quotequote all
Skyedriver said:
Sorry, bit of a thread hijack but left side / right side?
A friend is putting together a Rover V8 and the pistons/rods are supposed to go in with a mark on the rod pointing a particular way on the right bank and the opposite way on the left bank.
We stood there this afternoon trying to decide if that was looking from the drivers seat or from the front of the engine....
The left side of the engine appears on the left when stood behind the engine, with the flywheel at the back of the engine and the distributor at the front. The left side of the engine is the left side of the engine whether you look at it from in front or behind, just as your left hand is always your left hand whether someone looks at you from in front or behind.

Hope this helps

Ged

QBee

20,904 posts

143 months

Tuesday 26th May 2015
quotequote all
And to answer your next question, left bank is cylinders 1,3,5,7, right bank is cylinders 2,4,6,8.

Number 8 is the one nearest to the driver, where the plug extender pops off the plug more readily than the others. Never managed to work out why.
It is also neatly placed below the rubber fuel hoses, just ready to ignite the fuel when they perish.... yikes

Matt99man

Original Poster:

384 posts

266 months

Tuesday 26th May 2015
quotequote all
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

carsy

3,018 posts

164 months

Tuesday 26th May 2015
quotequote all
I'd be pulling the sump off and making sure the oil pick up pipe isn't blocked or loose.

Skyedriver

17,661 posts

281 months

Tuesday 26th May 2015
quotequote all
phazed said:
They only fit properly one way.

It's quite obvious really when you see one together., they sort of mirror each other.
The motor was together, he was questioning what he'd done.
to be fair he'd had a bad weekend with a knackered clutch on his Pop drag racer and I had my wee laddie with me. But when you looked up the bore at the piston, the con rod was not central on the gudgeon pin and I'm a symmetrical sort of guy....

Skyedriver

17,661 posts

281 months

Tuesday 26th May 2015
quotequote all
J400GED said:
The left side of the engine appears on the left when stood behind the engine, with the flywheel at the back of the engine and the distributor at the front. The left side of the engine is the left side of the engine whether you look at it from in front or behind, just as your left hand is always your left hand whether someone looks at you from in front or behind.

Hope this helps

Ged
Doooh!

First thought was "that answers a lot of f-ing help"

Then the penny dropped...

see also reply to phased above.

Maybe I shouldn't be allowed out on my own


Matt99man

Original Poster:

384 posts

266 months

Tuesday 26th May 2015
quotequote all
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.

Edited by QBee on Monday 25th May 19:21
I'm a log way away from them unfortunately! I ordered over the phone and had my local (ish) tvr independent fit it

QBee

20,904 posts

143 months

Wednesday 27th May 2015
quotequote all
You could ask Sportmotive to have a listen......and if they think it might be cam, tell them my theory

Proper Stokey

144 posts

118 months

Monday 1st June 2015
quotequote all
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.

Matt99man

Original Poster:

384 posts

266 months

Monday 1st June 2015
quotequote all
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 Jase

Not yet no, I would be very grateful for his advice!

Proper Stokey

144 posts

118 months

Tuesday 2nd June 2015
quotequote all
OK, I will nip around to see him tomorrow, how local to Fenton are you?

Jase.