Thanks Grant and Red..i get the offset as a compensation to gain clearance, but am struggling with why it is affected by a decked head. How does the fact that material has been removed from the lower face of the head affect what is going on with the location of the cams in relation to the valve buckets? Sorry if i am being dense!!
You can only adjust a chain so much then the run is affected so if you loose in pne place you have to gain in another hence the offset blocks... but as before me being lazy use them to gain some clearance in lui of removing said head and reworking.nick7 said:
Its all a simple matter of math's and without the offset blocks a lot of heads would be toast.
nick7 said:
If the top surface of the head has been skimmed, the cam bearing blocks are lowered towards the valves, thus decreasing the possible shim thickness.
Removal of material from the lower surface does not affect shim thickness, but does affect cam chain slack, just the same as a skim on the other side.
Lack of Laverda-specific (or DOHC) experience has lead to many, many Laverda heads being needlessly decked, often rendering them close to uselessness. Not understanding how the head gasket actually works has also lead to many fucked up heads. The slight recesses that show up between cyl #1 and #2 are rarely bad enough to warrant machining of the head, the gasket usually manages fine. I haven't come across a blown Laverda head gasket for ages, it's a very rare sight!
I reckon with so many of todays car engines being DOHC, the engine shop guys will no longer be as exhuberant with re-surfacing as they once were when they were dealing mainly with OHV engines.
piet
Tippie
Hero member
- Location
- Dr?bak, Norway
"Removal of material from the lower surface does not affect shim thickness, but does affect cam chain slack, just the same as a skim on the other side." As I found out on the recent SF2 with untouched unskimmed surfaces and thick replacement gaskets being unabe to fit an IWIS camchain as it was just too good spec, odd because it measured just 2mm shorter overall than Piet?s DID that just managed to fit.
1
1972750
Guest
Im sorry but I did not find to much help here?
Cosi
Hero member
- Location
- Kingscliff
Al the help in the world can be put forward, if you lack competence for the task at hand then it?s all meaningless jibberish...
gpacs
Full member
- Location
- Melbourne Australia
Got to give credit where credit is due, I've installed the Redax bearings on a few engines and they are more than works of art, they are precision made and the offset options are a bonus. I have used the Dutch version as well, also with an offset option, with a similar experience. They are both great products depending on where it's most convenient for you to purchase from.Grant said:Ok, bought in Germany, assumed Australian, actually Dutch.
Red, yours are still works of art.
Laverda SF
Hero member
Really not much difference then maintaining Valve Adjustment on a 1984 Volvo with a bucket pills ;o)
Far and few between once you have them set. Perhaps check clearance after 20,000 miles and after that forget about it.
More likely your cam will wobble or valve seats will deteriorate for another reasons.
SOHC and DOHC Bucket Tappet Systems are about fool proof - Provided you don't break a Cam Chain.
Far and few between once you have them set. Perhaps check clearance after 20,000 miles and after that forget about it.
More likely your cam will wobble or valve seats will deteriorate for another reasons.
SOHC and DOHC Bucket Tappet Systems are about fool proof - Provided you don't break a Cam Chain.