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What Valve springs?
https://www.ausmini.com/forums/viewtopic.php?f=2&t=42723		 Page 1 of 2
Author:  sitnlo62 [ Fri Jun 06, 2008 9:20 am ]
Post subject:  What Valve springs?
Hi Guys,
I am interested to know what valve springs, Brand , Type etc you are using with your 1.5 Ratio rockers where coil bind is an issue.
Many thanks,
Dave
Author:  awdmoke [ Fri Jun 06, 2008 10:34 am ]
Post subject: 
Coil bind can be a SEVERE problem. I've only just repaired my new motor this week.

This happened after only a few thousand kms:

Image

Obviously this is what you are aiming to avoid!

They have been replaced with standard "S" inners - had no problems with the outers. All 4 intake & 2 exhaust springs were broken.

This is an extreme combination of big valves, 1.5 roller rockers and a Kent MD296SC cam. Al Munday ended out pocketing the head for me to get the required clearance, as it was already running without inner spring retainers.

Now running with 20 thou tappet clearance too.
Author:  simon k [ Fri Jun 06, 2008 11:19 am ]
Post subject: 
FARK!!

that was on the clubman beast?
Author:  awdmoke [ Fri Jun 06, 2008 11:25 am ]
Post subject: 
Yep. Wouldn't have even known if I hadn't gone to change the rocker cover gasket. Fortunately no major damage done.
Author:  sitnlo62 [ Fri Jun 06, 2008 3:57 pm ]
Post subject: 
Obviously this is what you are aiming to avoid!


Boy thats a Nasty result !
Yes, exactly what I want to avoid!
All advice greatfully received.
Dave
Author:  CPOCSM [ Fri Jun 06, 2008 4:24 pm ]
Post subject: 
Yepp it usually masks itself well with coil bind - at least the springs broke there. I broke 4 valve caps...without losing one collet!!

I was pissed and amazed as I drove to sydney and back with it apparently - found the bits in the sump totally intact. I was kissed by the fairies!!
Author:  norton [ Fri Jun 06, 2008 4:32 pm ]
Post subject: 
CPOCSM wrote:
Yepp it usually masks itself well with coil bind - at least the springs broke there. I broke 4 valve caps...without losing one collet!!

I was pissed and amazed as I drove to sydney and back with it apparently - found the bits in the sump totally intact. I was kissed by the fairies!!

I would be taking a close look at the camshaft lobes, followers, pushrods and rockers after that effort :shock:
Author:  awdmoke [ Fri Jun 06, 2008 4:34 pm ]
Post subject: 
sitnlo the other thing to remember is that there are different valve caps.
The W ones reduce the inner valve spring height further.
Author:  CPOCSM [ Fri Jun 06, 2008 4:35 pm ]
Post subject: 
I did - not a sausage...not even in the cam followers!!

I went on to do another 50000km on the motor...it is in pieces on my garage bench now...

Cam was fine and is going off to GR for a regrind and the rest for another replacement motor...

I wont be using 1.5:1 rockers ever again :twisted:

1.3:1 will do me nicely
Author:  Gadgets mini [ Fri Jun 06, 2008 6:48 pm ]
Post subject: 
CPOCSM wrote:
Yepp it usually masks itself well with coil bind - at least the springs broke there. I broke 4 valve caps...without losing one collet!!

I was pissed and amazed as I drove to sydney and back with it apparently - found the bits in the sump totally intact. I was kissed by the fairies!!


when you do things Rob you do do them well :shock:
Author:  drmini in aust [ Fri Jun 06, 2008 7:02 pm ]
Post subject: 
It is bad news running any 1.5 rockers with stock springs, unless the cam is near stock lift.

I run an RE282 cam, with 1.58:1 MSC forged rockers, and it has .493" valve lift.
Never had a problem with MiniSpares' C-AEA526 springs, they have one less coil than most springs and are rated for this lift.
They are good for 8000 rpm. Enough for my roady 1360. 8)
Author:  Trimm [ Fri Jun 06, 2008 7:08 pm ]
Post subject: 
Try these....C-AEA526 they rev to 8 000 rpm and have a .495" lift
got them from car craft sydney. I 've reved my motor to 7500 rpm and havent had a problem ....well not yet anyway
Author:  CPOCSM [ Fri Jun 06, 2008 7:47 pm ]
Post subject: 
Gadgets mini wrote:
CPOCSM wrote:
Yepp it usually masks itself well with coil bind - at least the springs broke there. I broke 4 valve caps...without losing one collet!!

I was pissed and amazed as I drove to sydney and back with it apparently - found the bits in the sump totally intact. I was kissed by the fairies!!


when you do things Rob you do do them well :shock:


Yeah but at MDU I snapped the clutch clevis pin coming into the complex and then snapped it again a week later The clutch bit broke this time - not the pin!!)

I dont think I do it better - I am just a lucky bugger!! :lol:

I have the mechanical nouse of a corpse!...but I get by... :lol:
Author:  mickmini [ Sat Jun 07, 2008 5:38 am ]
Post subject: 
drmini in aust wrote:
It is bad news running any 1.5 rockers with stock springs, unless the cam is near stock lift.

I run an RE282 cam, with 1.58:1 MSC forged rockers, and it has .493" valve lift.
Never had a problem with MiniSpares' C-AEA526 springs, they have one less coil than most springs and are rated for this lift.
They are good for 8000 rpm. Enough for my roady 1360. 8)


ditto - also with RE282, but only standard pressed steel rockers and 7000rpm limit on my motor.
Author:  sitnlo62 [ Tue Jun 10, 2008 8:28 am ]
Post subject: 
Thank you guys for your help and advice.
Have ordered the C-AEA526 springs. Waiting for them to arive now so I can Fit them.
Dave
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