How to work out camshaft specs

[JetspeedCamry]

Hi,

Is there any way to work out duration and lift of a particular camshaft with it removed from the head? And if so, how?

TIA.

[slide86]

yeah, you will need some specific tools tho.

a dial indicator will help tell you the max lift of the lobe. you will need some special type of jig that hold the cam at either end. it looks like a big V, one sits at either end. Then you can rotate the cam slowly and smoothly.

[Toobs]

Yes... send them to Wade camshafts
Otherwise it would be easier to chuck them back in the head and measure them up properly with a dial gauge.

[slide86]

and if you have them in the engine then you can use a degree wheel and dial indicator. this is a good way to do it. degree wheels can be a bit hard to understand at the start, but you will get the hang of it

[jonra23]

Yes.
To get lift measure across base circle (smallest measurement on cam lobe) and across nose (largest measurement on cam lobe) of cam, subtract base circle from nose measurement and that is cam lift. Guessing it is on a 2vz-fe so dont need to worry about rocker ratio. Really need calipers to get accurate measurement.

To get duration attach a protractor on end of cam with a pointer fixed so that can get reasonably acurate measurement, rotate cam slowly until touching lifter, note degrees, rotate until cam lets valve/lifter reseat, subtract start degrees from finish degrees and have duration in cam degrees. Advertise duration is normaly in crank degrees so multiply by 2.

[JetspeedCamry]

Yup, on a 2VZ-FE.

Thanks guys! I have a wooden cam jig made up with a degree wheel..so that will be perfect. Its the maths that are confusing!! haha.

Thanks again.

[Toobs]

Max lift is fairly easy to measure as jonra23 described.
For duration you can do as jonra23 described but make sure your clearances are set at 50 thou... or at least for the lobe you are measuring.

[jonra23]

Are you getting aftermarket cams or getting a regrind done?, probably chasing some myself in a while.

regards
jon

[JetspeedCamry]

Are you getting aftermarket cams or getting a regrind done?, probably chasing some myself in a while.

regards
jon

I will probobly get these cams reground..as to what specs im not sure. There are no off the shelf cams for these, so getting custom cams made up would cost a bit i'd imagine. Not really sure what the best option is....what do you think?

edit: if you need any pics of info let me know.

[jonra23]

Not sure, I am not up to that stage yet, still making rwd conversion, saw your post and took the opportunity to chase some info for use later if it was available.

Only trouble with regrinds in a bucket style lifter is that to get greater lift or duration there has to be a decreases in base circle diameter which then has to be made up with shims.

regards
jon

[JetspeedCamry]

Yeah...what i was going to try to do was use shimless buckets in this...apparently the NZ, A and S buckets work...i know the 1NZ has shimless, and if theres any aftermarket options for the A and S series for shimless then they may work also....but i have no clarification of this yet.

Measured the lift...
Base is 32mm
Nose is 39.5mm
Lift = 7.5mm

[jonra23]

Cool would be interested in how you go with this.

Manual that I have says nose measurements of 39.51mm for intake and 38.96mm for exhaust, no base circle measurements or duration though.

reagrds
jon

[JetspeedCamry]

Cool would be interested in how you go with this.

Manual that I have says nose measurements of 39.51mm for intake and 38.96mm for exhaust, no base circle measurements or duration though.

reagrds
jon

Yeah that was for the intake cam, ill measure up the exhaust cam tomorrow and see if can get the duration...do you have msn? Id be also intereseted to see how your project goes

[jonra23]

Going to be a while in the making.





regards
jon

[JetspeedCamry]

Hehe like wise..