AJP V8 Bearing Shells

AJP V8 Bearing Shells

Author
Discussion

Bogsye

Original Poster:

132 posts

101 months

Monday 9th December 2019
quotequote all
Looking for thoughts please. I’m refreshing my engine and I’m going to fit new bearing shells.

The originals are regular copper with lead. They were looking a bit worn hence the change.

Looking around one of the part suppliers has aluminium shells available rather than the traditional copper and lead variants.

Any thoughts on whether it’s best to stick to original or move to the aluminium variants?


Thanks,
Brian

ukkid35

4,982 posts

122 months

Monday 9th December 2019
quotequote all
I have a thread here on this issue

https://www.pistonheads.com/gassing/topic.asp?h=0&...

And some more advice here

https://www.pistonheads.com/gassing/topic.asp?h=0&...

The Clevite big end bearings are available from RealSteel, but I'm still unsure where to source suitable mains

Bogsye

Original Poster:

132 posts

101 months

Tuesday 10th December 2019
quotequote all
Thanks Paul - that’s handy.
The aluminium ones are King as far as I can see. I did find some useful info on the mechanical properties of lead vs aluminium however, it really didn’t take me much further forward.

Looking at your photos I’ve dodged a bullet also. Mine had some copper showing on the mains.

Next issue is getting piston rings at a reasonable cost. Seem to be stuck with a limited source for these.

Have managed to get the needle bearings per earlier suggestions.

Thanks again,
Brian

Jhonno

3,656 posts

90 months

Wednesday 11th December 2019
quotequote all
TVR Parts sell rings for ~£200 for a full set?

Bogsye

Original Poster:

132 posts

101 months

Wednesday 11th December 2019
quotequote all
Sadly no stock to be had there.
Looking at other options at the moment.
Thanks,
Brian

spitfire4v8

3,121 posts

130 months

Wednesday 11th December 2019
quotequote all
You could to speak to dave at performance unlimited, it's where I got my piston rings from (total seal)

Bogsye

Original Poster:

132 posts

101 months

Wednesday 11th December 2019
quotequote all
Thanks - just in the middle of speaking with him to see if he can sort some out.

Need to get the following down to him:-
Finished bore size
Each ring thickness
Radial depth of the grooves in the pistons

Hopefully get this sorted to allow assembly over the Christmas period.

Jhonno

3,656 posts

90 months

Wednesday 11th December 2019
quotequote all
4.2 is 88mm bore.

4.5 is 91mm bore.

Jhonno

3,656 posts

90 months

Wednesday 11th December 2019
quotequote all
Bogsye said:
Thanks - just in the middle of speaking with him to see if he can sort some out.

Need to get the following down to him:-
Finished bore size
Each ring thickness
Radial depth of the grooves in the pistons

Hopefully get this sorted to allow assembly over the Christmas period.
I got mine from Dave, it's not as complicated as it sounds. You will have to gap them though.

TwinKam

1,332 posts

44 months

Wednesday 11th December 2019
quotequote all
Or just bite the bullet and get them from Dom as I did (he was the only stockist when I needed mine). He'll know what to send you.

Bogsye

Original Poster:

132 posts

101 months

Wednesday 11th December 2019
quotequote all
Thanks all - appreciated.
Spoke with Powers and they don’t have stock so the suggestion was to go direct to get them. TVR parts were also out of stock.

Hopefully measure up the gaps this evening and get the figures over to Dave.

It’ll be quite interesting gapping them, as I’d been reading up on all this before embarking on the overall task. I’ve ‘rebuilt’ engines before, but given the nature of this I thought it prudent to get a bit more into the detail.

Bogsye

Original Poster:

132 posts

101 months

Thursday 12th December 2019
quotequote all
spitfire4v8 said:
You could to speak to dave at performance unlimited, it's where I got my piston rings from (total seal)
That worked well - hopefully got a set of rings on the way for less than £200👍
Thanks

Bogsye

Original Poster:

132 posts

101 months

Tuesday 17th December 2019
quotequote all
Result! The piston rings appeared today.

Just the assembly to do cool

Bogsye

Original Poster:

132 posts

101 months

Saturday 4th January
quotequote all
Not made the progress I'd hoped for.

Test assembled the big end, and conrods to the crank while it wa son the bench. That was good.
Where I came unstuck was the main bearings - what was supposed to be for an early 4.2 wasn't. Originals have both shells with grooves and locating tabs offset. What I got had one shell grooved, the other plain and with a central locating tab.

Schoolboy error on my part for not checking on receipt. Anyway, TVR Parts will need to fix that.

Piston rings from Performance Unlimited appeared super promptly. Fitted these, but one of the second rings just didn't 'feel' right. After a bit of chat with Dave I put the offending ring on a flat surface and established it had a bit of an upward curve at the gap. I could get a 16thou feeler under it.
Obviously not Dave's fault - He has been very proactive and helping and solving this for me. beer

So, kind of still on the starting blocks with this one. Hoping to get the replacement parts this week and crack on.

I had visions of a near finished engine sat on my bench by the start of January..... Must be part of the enduring optimism that goes with TVR ownership biggrin

TwinKam

1,332 posts

44 months

Saturday 4th January
quotequote all
You have to buy two sets of RV8 Mains to reshell an AJP8. Cheap enough.

Bogsye

Original Poster:

132 posts

101 months

Sunday 5th January
quotequote all
Ahh, that would seem logical!
Thanks smile

Bogsye

Original Poster:

132 posts

101 months

Sunday 5th January
quotequote all
Well, on checking back, the TVR Parts site does indeed say "(2 Sets Required)"

So, on that basis, I am somewhat a victim of myself! banghead

On the positive side, it's an easy fix