procedure for re-adjusting cam gears???

[MR22ZZ]

'transmissions' instead of gearboxes,

it's always been transmissions for Auto and gearboxes for manual for as long as I can remember.

[Billzilla]

it's always been transmissions for Auto and gearboxes for manual for as long as I can remember.

You must be young then.
I can remember from the 60's up until the late 80's, when it started to creep in occasionally. Then it took off in the mid 90's when the internet became popular and the sheeple started reading a lot of US content.
Aussie is gearbox, tranmission is not.

[30psi 4agte]

For starters, try something like a 100° inlet lobe centre and about a 106° exhaust lobe centre.
And BTW, they're cam pulleys, not gears.

For what its worth....... Do you think Jordan is going to beable to set his cams to 100 inlet and 106 exhaust when he is asking if he has to remove the cam or not to adjust them ?

I know you are right with what you are saying bill but i think things need to be kept simple here as he obviously hasnt much of an idea.


Jordan: Just use a bit of liquid paper to mark where the gears are now. undo the little adjusting screws and on the cam gear ( i to think they are gears ) turn the cam to 0deg with a spanner on the cam bolt and tighten them up.

Once you pass then you can undo the cams and set them back to the white marks and your done mate!

[oldcorollas]

and as supplement.. take a pic and post it here, so you won't forget which way they were mean tto go

can you check with the dyno guys as to what angles they are at now?

[30psi 4agte]

If you are driving down a hill on closed throttle do youre brakes have a booster ?
I ask because your motor should be creating vac in this situation. ( even with the biggest cams you will have vac)

I f you still dont have brakes id be looking at the booster.

[The Real Roadrunner]

If you are driving down a hill on closed throttle do youre brakes have a booster ?
I ask because your motor should be creating vac in this situation. ( even with the biggest cams you will have vac)

I f you still dont have brakes id be looking at the booster.

unless of course it was an automatic (which it is) and then unfortunately you miss out on 2 things 1: engine braking and 2: high rpm decel with closed throttle which would cause a large amount of vacuum.

still could be a booster problem, but with the angry idle the car had last time i saw it i dare say they will need to be adjusted suit the situation or get a vac pump fitted.

cheers
linden

[amichie]

To improve idle vacuum you need to widen the lobe centre angles. This means less overlap. The settings you described above already have reduced overlap. Advancing the exhaust cam and retarding the intake will reduce overlap further and both are less likely to create any internal clearance issues.

On the other topic. Some people call a footpath a sidewalk . Their are millions of people over the Pacific that get it wrong.

[Billzilla]

For what its worth....... Do you think Jordan is going to beable to set his cams to 100 inlet and 106 exhaust when he is asking if he has to remove the cam or not to adjust them ?

I know you are right with what you are saying bill but i think things need to be kept simple here as he obviously hasnt much of an idea.

So how does he get an idea?
I'll often dangle something like that in front of people to see if they're wanting to learn. He may well ask then someone will tell him, and he'll hopefully learn something from it. He may not, and think it's all too hard.
It's along the lines of -
Tell me and I'll forget.
Show me and I'll remember.
Involve me and I'll learn.

He may not know about cam overlap affecting inlet vacuum and he may not know about how the vacuum system on brakes really works.
If he needs to, he could find these things out here.

[PlacentaJuan]

i want to learn why you think they are called pulleys.

so whats the difference between a gear and a pulley then?

i allways pictures a pulley as one of those things you use to make a flying fox with, or lift a large load.

and a gear is what you will find in a gearbox, or inside a clock and they have intermeshing teeth.

is it the intermeshing teeth that make it a gear, or the fact that they are driven (or drive) a flexible medium (like a rop or chain) that makes it a pulley?

ie, their function or design?

[Forcefed6]

Not wanting to get into any real argument here, they are TECHNICALLY called pulleys, well according to the 1GG Workshop manuals



I have been know to refer to them as cam gears, and will continue to, as it is the most known common term for them, and most people will know what your talking about.

Now as for adjusting these, as mentioned previously. Mark where they are currently set, loosen the 5 bolts towards the outer edge of the cam gear. Rotate the inner part/camshaft with a spanner socket on the bolt in the middle, then tighten bolts back up.

Do one cam at a time.

Also, by setting them at 0 might not help for engine vacuum. You might have to have a fiddle with them to try and find the best spot for them where they create the most vacuum at idle. I know the cams I have which have 235deg@50, don't have a huge amount of vacuum at idle (like about 4" of vac when set at 0), but I can set them so the gauge will read around 14" of vac.

[Pube]

For safety sake for strip or street, you are avoiding the real problem that your brake booster isnt getting vacuum. At the end of the drag strip I have found that you need brakes! even running just a low 13, you need brakes! It looks like you will be going better than my time too. You should address the real problem and sort out a vacuum pump or whatever and not fiddle with your cam timing.

[J0RD0]

well when your sitting in the car with one foot on the brake and the other on the acc, when you rev the car between 1000rpm and 1500rpm you can feel the brake pedal go up and down while watching the boost guage do the same thing. dont think there is anything wrong with the booster because before i changed to a ma70 booster the stock and supra booster did the same thing. included is a pic of the cam gears as they sit, sorry about the quality but you get the idea. hope this helps

[The Real Roadrunner]

does it have a one way valve in the line between the booster and the inlet manifold? what sort of condition is the one way valve in?(if it has 1)

what sort of vacuum are you getting on the guage?

need some more info

[J0RD0]

the vid on the first page shows the car running with a boost guage in sight, its - 1 on the guage if its lucky. no one way valve in between the booster and engine. did the ma70 have an external 1 way valve?