Valvetrain Talk

[kitto]

question still stands can i use tomei solid lifters with 9.15mm lift cam ? if i get some yesses or no's i can look into something different or purchase..

No, you wouldn't use them as you dont have small base circle cams.

They are suited to 'Tomei' cams with more than 10.25mm lift.

[Luke_ENR34]

So is there a aftermarket lifter to use with a 9.15mm lift cam?

Would like to know this to so i can upgrade them if possible to suit the V-cam.

[kitto]

So is there a aftermarket lifter to use with a 9.15mm lift cam?

Not required... The smaller lift camshafts use the same base circle diameter as the factory cams. In other words they are machined 'the same'. So they are not required. Just make sure they are in good condition and you have adjusted the valve clearances correctly.

[OMGGTR]

ok so since my lifters are rooted i have to buy genuine...? $58 bux each lifter on RHD.... any1 know where to get cheeper ?

[Guilt-Toy]

little off topic, would the tomei 270 with 8.8mm lift cams work well with a stock rb25 head? the lift is not that much bigger then stock.

[zebra]

I would be wary about the ramp rates being 270s, maybe a little more spring pre-load you could get away with them

But with 270s you would want to rev a 25 pretty hard to take advantage of them, or is it for your 30?

[Guilt-Toy]

yeah its my 30....

i can get springs if i really need them, just can't be assed if there is no need for it.

i dont rev this engine past 7000rpm btw...

what do you think?

[zebra]

well you're handy on the spanners, give it a go, not a big job to pull the cams back out if it floats

Off the top of my head all the 270 results ive seen had springs, but they all had more lift than what you do.

p.s didnt you score some camtech 272s a while back? (was flipping through an old Zoom mag yesterday)

[Guilt-Toy]

yeah, i put them in a R33 in Armenia after we took this video. the lift was 10.25 on those.

[OMGGTR]

any 1 here ever grinded the valve stem down instead of buying new shims? will it work that way ?

[Gerg_R31]

Correct term is 'under bucket shim' (and there is 'over bucket shim' & 'solid bucket')

Rb26 clearances - 0.018" ( +/- 0.001") intake & 0.015" exhaust ( +/- 0.001")

Measure with feeler gauges when the cam lobes base circle is above the bucket

Face valve/ cut seat/ order thicker shims to close the gaps

Machine tip of valve/ shim to open

Too loose it will rattle and cause premature wear

too tight it will stay open causing loss of compression

I've had to machine a 26 head out for poncams a couple times

try reading the whole thread