cam profile mod gains

[Celica RA45]

also to note a beams cam is 268 advertised with 12mm of lift at 50 thou it is 226
my cam is 320 advertised and has 14.65mm of lift and is 263 at 50 thou
it uses a 100 lobe center
but im still using vvti so i use lifter rise at tdc and move cam from 100 thou to 230thou at tdc and then move it back to 150 thou at 9000 rpm

[JadeEstevez]

Sorry for overriding your question Metcap.

[andrew_mx83]

There are plenty of other options apart from thicker shims...

If I was going to the extent of getting a cam welded and ground i would not be running shim over bucket anymore anyway.

[Celica RA45]

all beams are shim under bucket same with gen3 3sge

[andrew_mx83]

So who cares if its got thicker shims if they are under the bucket anyway? Its not like they have anywhere to go...

[Celica RA45]

so you would be happy to take off 2mm off the base circle and add 2mm to the shim and end up with 5mm shim under the bucket
so more weight and the chance for the shim to pop out at hi rpm and bang piston into valve ,thats what normaly happens.. it get stuck on the side of the retainer ,which then pushes valve further towards piston

[andrew_mx83]

Alarm bells are ringing! For that to happen there must be huge amounts of valve bounce, or lash, or its just a really shit design.
How do you end up with enough clearance to let the shim go anywhere when its being pushed up by a sprung valve and got a cam lobe holding it down?

[metcap]

when degreeing a DOHC engine(cam over buckets) is it advisable to have zero valve lash or just keep it as per manual?

[oldeskewltoy]

when degreeing a DOHC engine(cam over buckets) is it advisable to have zero valve lash or just keep it as per manual?

most cams will give you 2 sets of #s... one set with zero lash, and another set with either .040"(1mm), or .050"


To get involved in the other discussion... you could always look at getting valves with 2mm or 3mm more stem length............

[Celica RA45]

thats why i get cams welded up ,your idea is costly taking head off and getting longer valves and new head gaskets and lapping in new valves

[knightrous]

What's the cost for getting cams welded up?

[metcap]

most cams will give you 2 sets of #s... one set with zero lash, and another set with either .040"(1mm), or .050"

.

How about when we degree the stock cams where we dun have any reference numbers from the factory?

[oldeskewltoy]

How about when we degree the stock cams where we dun have any reference numbers from the factory?

By using a dial indicator position over the valve bucket you can determine (by using the above numbers) whether or not those measurements are @ zero clearance, or 1mm.


Concerning the whole weld it or not(cams), my point about longer valves was it is the only other "correct" way... besides welding up and keeping the base circle.... apologies if it was taken incorrectly

[Celica RA45]

your fine old school ,but doing shims with the head off the block and then bolted to the block changes to many things in some cases i can have some shims change clearences by about 4 thou open up and also tighten up
from memory hard facing for a 16 valve motor is about 1 grand so 8 valve motor would be half that

[metcap]

By using a dial indicator position over the valve bucket you can determine (by using the above numbers) whether or not those measurements are @ zero clearance, or 1mm.

those numbers are for the 2tg stock cams?