using combined over and under cam bucket shims

[jezza323]

ive also heard good things about web cams in USA in regards to welds

[oldcorollas]

they only fail sometimes?

[jezza323]

nah, ive heard the yanks say they dont fail. doesnt mean that its true though

[oldeskewltoy]

they only fail sometimes?

WEB-CAM has been hard welding and grinding cams since 1945. With our knowledge, and long time involvement with the racing industry WEB-CAM has proven to be the best.

Our nickel based hard facing alloys are homogeneous materials containing complex microscopic bi- and tri-metallics. These weld overlays greatly enhance the erosion and abrasion resistance of our hard welded parts. In addition, they offer very high thermal fatigue resistance.

During our welding process a metallurgical bond is achieved with the substrate. The overlay’s natural lubricity and their resistance to galling coupled with low RMS finishes mean less wear on both our cams and your mating surfaces.


The entire crew at WEB-CAM has a dedication to top quality workmanship and reflects the owners dedication to quality, performance and innovation.

http://www.webcamshafts.com/

[Billzilla]

Mate do it properly and get some blank valve the same diameter as what you have now, but you will be able to get the stems cut to the right length so you only need to have shims under the bucket.

[oldcorollas]

http://www.webcamshafts.com/
WEB-CAM has been hard welding and grinding cams since 1945. With our knowledge, and long time involvement with the racing industry WEB-CAM has proven to be the best.

Our nickel based hard facing alloys are homogeneous materials containing complex microscopic bi- and tri-metallics. These weld overlays greatly enhance the erosion and abrasion resistance of our hard welded parts. In addition, they offer very high thermal fatigue resistance.

During our welding process a metallurgical bond is achieved with the substrate. The overlay’s natural lubricity and their resistance to galling coupled with low RMS finishes mean less wear on both our cams and your mating surfaces.


The entire crew at WEB-CAM has a dedication to top quality workmanship and reflects the owners dedication to quality, performance and innovation.

their offhand laymans use of metallurgical terms only deepens my concern

seriously...

[Sam_Q]

who does custom valves apart from Ferrea?

[andrew_mx83]

try precision shims (bayswater or croydon i think) and just have one thick one over bucket?
they have shims in pretty much all sizes in stock and are cheaper than toyota genuine. i managed to get super thin ones (2mm) when the valves started pulling into the head on my gas 3rz.
im planning to grind the base circle and use larger (they go upto 4 or 5 mm i think) shims when i get around to doing something about my cams in the 7m....

[jezza323]

thick shims are far more likely to flick out at higher RPM

not really a good idea

[andrew_mx83]

i will probably pean them into the buckets...only downer will be having to replace the buckets when the head gets noisy/rebuilt.

[Sam_Q]

can you describe what "pean them" means?

[andrew_mx83]

as in use a punch to secure the shims into the buckets. it appears i should have spelt it PEEN

[Sam_Q]

oh now that makes sense, I would still be very wary of having a thick shim of that size though. Because its such a large shim it would weigh quite a bit

[andrew_mx83]

would the weight be an issue? are buckets reciprocating mass? you would expect the cams to lose a bit of weight as well, might offset the problem a little.

no biggie if they pop out anyway....ull lose compression on a cylinder until u pull the rocker covers off and reset.....this has happend to my 7m once before (with standard shims) and there was no permanent damage.

[Billzilla]

would the weight be an issue? are buckets reciprocating mass?

Yes and yes - The mass of a bucket can be a problem at high revs and the buckets go up & down, hence they are reciprocating mass.