15 replies to this topic

[MiNiKiN]

Hi!

FYI! As a warning to anyone who, like me, is considering fitting the above timing chain to avoid having to remove the sprockets for changing the chain, will be disappointed, just like I am.
Minispares now only supplies a one-piece as a replacement for the split one.

At first I thought that maybe the wrong product label had been stuck on it - but no - Minispares confirmed that this is now the case. Manufacturer is still IWIS; the IWIS part number is: 50036156.
I'm going to secretly blubber a little

Anyone know of this and the reason behind?
 

cheers

 

 Minispares EVO timing chain 2H4905EVO 

 

 2H4905EVO_OLD.jpg   83.84K   0 downloads

[Ethel]

If the chain is worn enough to require changing then, odds on, the sprockets are too. 

[gav]

We changed them due to customer demand, none of the race engine builders wanted chains with a removable link. We will update the picture shortly. Apologies for the mix up.

[MiNiKiN]

If the chain is worn enough to require changing then, odds on, the sprockets are too. 

The old chain had only seen 4kmiles. I say, nothing wrong with the sprockets.

[Lplus]

 

If the chain is worn enough to require changing then, odds on, the sprockets are too. 

The old chain had only seen 4kmiles. I say, nothing wrong with the sprockets.

 

I'd say nothing wrong with the chain either at that low a mileage.

[Spider]

In my books, new chain also means new sprockets, though in your case with only 4000 on them, you'd likely get away with it, but fitting a new chain to otherwise worn sprockets, only wears what's left of the sprockets faster and the chain will also have a premature ending.

[MiNiKiN]

 

 

If the chain is worn enough to require changing then, odds on, the sprockets are too. 

The old chain had only seen 4kmiles. I say, nothing wrong with the sprockets.

 

I'd say nothing wrong with the chain either at that low a mileage.

 

The chain doesn't seem worn as such, but terribly streched.

 #4.jpg   60.32K   5 downloads

[Lplus]

 

 

 

If the chain is worn enough to require changing then, odds on, the sprockets are too. 

The old chain had only seen 4kmiles. I say, nothing wrong with the sprockets.

 

I'd say nothing wrong with the chain either at that low a mileage.

 

The chain doesn't seem worn as such, but terribly streched.

#4.jpg

 

Not sure what others think but I'd say that's about right for a run in chain.  There's a small amount of play necessary to fit the parts new and the running in period knocks off all the sharp edges and smooths out the mating faces of both chain and gears leading to a bit more clearance.  I just fitted a new single row chain and gears to an A+ motor and that much sag was already evident when I'd fitted the tensioner.  Presumably it wasn't rattling noticably?  I don't know what that much sag represents in cam timing inaccuracy.  Clearly you timed it in correctly, so how far out is it now?

 

Edit, I take it you lined up the gears with shims at build time. 

Edited by Lplus, 16 December 2022 - 10:14 AM.

[sonscar]

Looks slack to me but then I am no expert.Primative variable valve timing?Steve..

[gazza82]

One I received was the incorrect part and too long. MS swapped it with no quibbles. The original sent was with the link, the new one was one-piece - the type I expected to get.

[imack]

That chain looks seriously slack!!
Any better pictures of the cam and crank sprocket teeth?
Chains don't physically stretch, rollers, pins and sprocket teeth wear creating increased distance between rollers that make a chain appear stretched.
Gold coloured sprockets are from Kent cams and are about 30 years old and chain is 7000 miles old - no excess slack. Silver MED sprocket and chain is new.

Attached Files

•  20181221_210423.jpg   50.98K   1 downloads
•  20221021_213259.jpg   38.09K   0 downloads

Edited by imack, 16 December 2022 - 01:28 PM.

[gazza82]

Looks slack to me but then I am no expert.Primative variable valve timing?Steve..

Looks VERY slack ...

[Ethel]

That's a strange one. Obviously it wouldn't sit well on the sprockets if it was stretched that much, but it's hard to imagine there being enough for a couple of extra links.

[MiNiKiN]

Your experience is much appreciated The the timing gear (I think it's a Kent) with chain as in above photo was previously used in my mates engine with a tensioner.
I am just about to go down in the workshop to fit the new chain. I will take some pictures of the sprocket teeth then.
Watch this place...

Edited by MiNiKiN, 16 December 2022 - 04:32 PM.

[MiNiKiN]

 

Not sure what others think but I'd say that's about right for a run in chain.  There's a small amount of play necessary to fit the parts new and the running in period knocks off all the sharp edges and smooths out the mating faces of both chain and gears leading to a bit more clearance.  I just fitted a new single row chain and gears to an A+ motor and that much sag was already evident when I'd fitted the tensioner.  Presumably it wasn't rattling noticably?  I don't know what that much sag represents in cam timing inaccuracy.  Clearly you timed it in correctly, so how far out is it now?

 

 

 

 

Edit, I take it you lined up the gears with shims at build time. 

 

Well with that slack we are talking a couple of degrees in "variable timing" - does not make much sense correctly timing it yet. But I have set it to 104° (as per K. Calvers advice to set it 2° early, when measuring on the push rods) - might correct that to 106°.
The sprockets are aligned of course - not with shims, as I had to grind 0.3mm off to get it in line.

Edited by MiNiKiN, 16 December 2022 - 04:35 PM.