10 replies to this topic

[sam138]

I’ve recently purchased a set of 1.5 rockers from minispares as per link below which have been attached to my MSE4 head today. I’m having issues with the space gap under one of the metal squares that bolt down. I’ve tried re arranging on bar but no good and backed off rockers on screw but still not allowed the end one to sit down properly.

https://www.minispar...px|Back to shop

Any ideas please ?

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Edited by sam138, 18 September 2019 - 09:07 PM.

[Cooperman]

It looks as though the end rocker is too close to the pillar. You may need to add a shim or shims to move the rocker face away from the pillar. This is quite a usual thing to have to do to optimise the rocker pad position and the rocker faces relative to the pillars and the position of the push rods as they pass through the head.

Many people remove the horizontal springs and replace them with bronze tube and use bronze shims/washers to get the positions correct. The actual pad position is less critical than the push rod clearance in the push rod hole and it needs to sit as centrally as possible.

When fitting what are considered competition parts some engineering skills are usually needed and it is not necessarily just 'fit and forget'.

[sam138]

Thank you for the reply I’ll look to get some shims and adjust up. Will this then allow the rocker post to sit flat on the head as it’s not currently as photographed.

Edited by sam138, 18 September 2019 - 09:51 PM.

[jaysmini1983]

will it not pull over against the springs? mini spares also do the upgraded rocker shim set. that me be worth purchasing.

https://www.minispar...36.aspx|Back to

[DeadSquare]

Try removing the number one rocker, shown in your photo, and see if the metal square thing, or  pillar, then sits down tight on the head.

 

Also, out of interest, which valve springs are compressed ?

Edited by DeadSquare, 19 September 2019 - 06:55 AM.

[croc7]

I been told that there are different pedestal heights; 1.62” for 1.3 rockers, 1.75” for 1.5 rockers although the part catalogs don’t specify a different part number. I measured a couple of spare rocker assemblies that I have laying around and found it to be true, the pedestals for the 1.3 rockers were about 0.125” shorter the those for the 1.5’s. Thoughts?

Edited by croc7, 20 September 2019 - 04:34 AM.

[GraemeC]

As asked above, are any of the valve springs compressed?
It looks to me like they aren’t and it just needs tightening up to torque.

[carbon]

The Minipares pedestals for their forged '1.5' rockers are not symmetrical, and can fit in one of two ways. This is not obvious apart from the one which is drilled for the grub screw which retains the rocker shaft in correct location.

 

Also the pedestals in the set I fitted were slightly taller than the standard pedestals. This meant that the two sleeved rocker cover nuts were bottoming out before the rocker cover gasket was fully compresed.

 

To sort this properly I machined all of the pedestals to get correct fitting height. From memory it needed a total of about 2 - 3 mm to be taken off. When all was fitted the measured valve lift gave the effective rocker ratio as being close to 1.65

 

Check carefully for coil binding if you're using anything racier than a low lift cam grind.

[croc7]

It could be that you received a mixed set of pedestals with the 1.5 rockers. I’d check to see that they all are of the same height. For correct geometry, the pedestals for the 1.5 rockers should be taller than those for 1.3.

[carbon]

I been told that there are different pedestal heights; 1.62” for 1.3 rockers, 1.75” for 1.5 rockers although the part catalogs don’t specify a different part number. I measured a couple of spare rocker assemblies that I have laying around and found it to be true, the pedestals for the 1.3 rockers were about 0.125” shorter the those for the 1.5’s. Thoughts?

Is this for the 1.3 and 1.5 ratio roller rocker sets?

 

Minispares only sell 1.5 ratio forged high lift rocker sets.

[croc7]

Normal stock 1.3 rockers (pressed steel, forged Cooper S, sintered) used the 1.62” pedestals. Other than stock rockers used taller pedestals designed to give correct valve train geometry.