IF it IS loss of valve control,
there are quite a few springs available.
Probably the best current option for VW diameter dual springs
is the CB performance 650 spring.
http://www.cbperformance.com/catalog.asp?ProductID=1586
Three important things!!:
1.You must check that the spring can not get into a bound condition.
1.5mm from bind at full MEASURED lift is a good start point.
2. Correct the CAUSE of valve spring pressure loss!!
This can be a range of causes,
some of which relate to correct selection of
cam, rockers and initial valve train set up,
like spring pressure at installed settings and even geometry.
3. Get a rev limiting device an set it to prevent valve float.
I found out the hard way many years ago,
that the tacho and my ear, were not a good enough way to control the revs.
An actual rev limiter is a MUST.
I over reved my engine once and a search of the resultant 3 cylinder running
had a valve spring fall into the dirt,
😂
when the rocker cover was removed.
Once I fitted a rev control,
I found i was hitting it all the time,
and it was set 1000 rpm more that where i thought I was reving the engine.
Spectators said I reved it so high, that only dogs could hear it.
westi wrote:That's mad Alan.
