1.9 Gti Cam Wear

[nick9one1 2]

do 1.9 cams wear out much? I'm looking at swapping the long duration cam i have for a standard one. should i go for a new one? or swap for a 2nd hand?

 

I have read the 1.6 suffers badly from cam wear, but not the 1.9?

 

Cheers,

Nick

[boldy205 75]

Not known of the standard cams wearing, possabaly if some of the spray bar jets were blocked? I have a standard 1.9 cam if you want it?

 

Matt.

[Miles 331 1 Cars]

They are starting to wear on some engine's, You need to remember these are all getting old now so parts will be past there best, Most are useable thou but you must re-shim the tappet's if you change the cam

[trialster 0]

nick and i have just swapped cams

 

so if we need to re shim, could you do it first nick and tell me how much i need to add/take off? only joking!

 

how important is it to reshim? because i cant see there being much difference atall tbh.

[Miles 331 1 Cars]

Allot so a re-shim is a must in my book, You might be lucky but I'll eat my hat (If I had one)

[trialster 0]

but will there actually be any difference?

 

i thought you only need to re-shim after changing/grinding in valves?

 

with changing a cam, surely the BCD always stays the same?

[trialster 0]

anyone? bcd ever change?

[welshpug 1,657]

what's BCD? cam grinding tolerances, plus factory head line boring differences, and tappet wear, all contribute to quite a vast difference in clearances when you start swapping stuff around.

 

bear in mind that you're talking tenths and hundredths of a MM, and the difference could lead to lack of compression, or the valve not opening much at all.

[trialster 0]

bcd - base circle diameter, that part of the cam profile which is opposite to the lobe.

 

i can only see there being need to re-shim if that bcd is different, remember im only changing the cam, valve seats and tappet wear dont really come into it, because they were running fine with the old cam...