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#1
02-09-2014, 10:05 AM
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Retro fit
Hello everyone,
Ive been wondering if its possible to retro fit hydraulic tappets to a head that has shims. Cheers, Brian. 
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#2
02-09-2014, 02:53 PM
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Yes, but it will be lots of work for next to no gain.
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#3
02-10-2014, 06:33 AM
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Retro fit
The reason I ask is that I've access to a new cylinder head but the head is bear. I have already bought a new cam and instead of fitting the old type tappets I would just simply fit the newer hydraulic tappets. Just checking before I buy.
Thanks.
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#4
02-10-2014, 09:44 PM
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They need to be pressure fed oil to work, so fab would be ext(p)ensive unless you work at a machine shop and are really bored.
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#5
02-18-2014, 05:51 AM
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Not sure about the diesel 6 cyl, but I just went through this on a 1.8L gas 4cyl, and found that besides the obvious problem of a lack of oil feed, the camshaft in a mechanical head has a larger base circle dimension.
IOW, if a solid cam is installed w/ hydro lifters, the bigger lifters will hold the valves off the seat at all times. Conversely, a hydro cam with solid lifters will not contact the lifters during the base circle, only about halfway up the ramp will there be contact.
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Thanks, Jim C. 1985 745 TD MT (project) 1986 A2 Golf GTDI swap LeMons racer (very not stock) 2001 Golf TDI (not stock) Last edited by FJ40Jim; 02-18-2014 at 05:54 AM.
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Linear Mode
