3 replies to this topic

[Chris Wilson]

When progressively wound poppet valve springs are fitted (springs with the coils wound closer together at one end) it is nearly always stated in the tech books to fit the closer wound coils against the cylinder head. Why would it matter which way up they are fitted? Just curious, i can't see why it would matter, the close coils become coil bound and the rate increases after that. Which way up seems irrelevant, but I await a smacking forehead moment ;) Thanks

[Engineguy]

The end with more coils weighs more... you'd rather have fewer coils moving "lift" distance and more coils almost stationary (just their compression movement distance).
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[Fat Boy]

[Chris Wilson]

Indeed, "SMACK" Thanks for that, appreciated.