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valve springs
Posted: Sun Oct 04, 2015 6:04 pm
by martin418
hi does anyone know the free length of a std 1098 valve spring ,i am just checking as i have 2 heads apart and i have a 3/8 difference in the 2 sets
Re: valve springs
Posted: Sun Oct 04, 2015 6:26 pm
by bmcecosse
Use the longer ones !
Re: valve springs
Posted: Mon Oct 05, 2015 2:45 pm
by philthehill
The free length off a valve spring will be dependent upon the valve springs used.
The free length of a new and unused standard valve spring (Pt No: AEA 311) used on a 1098cc 'A' Series engine is 1.75" (44.45mm).
What ever valve springs you use you must check that the valve springs do not suffer from spring crush when the valve is fully open.
Spring crush is where the valve spring coils come into contact with the coil above and/or below. Spring crush can damage the valve train so it is important to check valve spring coil clearance.