Adjustable cam gear - What to choose?

[andy112]

As 5 inline said, the adjustable gears are made to adjust. You have to adjust TDC to oem spec using a degree wheel or you can adjust the cam opening at different degrees before/after TDC. If you want oem spec on cam timing then use the oem gears, theses are designed for adjustment so that you can have different specs from oem. I have a few questions though anyone know the oem specs when the valves open close in relation to TDC for the 7a motor? What about 3b/aan/adu? Also anyone know if the 034 pinned cam gear will bolt to the 7a cam?

[Faheemo]

He's not the tuner - the engine builder.
When the engine is built and running then the tuner takes over with the fancy stuff.

[5inline]

He was asking why thers no center or zero marking on the adjustment range - so i take it he wanted to zero the cams without the use of a degree wheel.
He said if the standard sprockets keyway is aligned then the teeth are aligned on the oem units - so the adjustable ones arent manufactured very accurately since they dont align.
Is this correct or am i missing something ?

He is missing the whole point.
What is the point of having an adjustable sprocket and not using a degree wheel to set it up with?
It's gonna be a complete shot in the dark.

No offense,but i would look for another tuner.
Just my opinion.

[Faheemo]

Sorry,i still don't get it.
Did he plan to set up your cams just by looking at the adjustment range of the sprocket?
The one i have has a adjustment range of more than 1 full tooth,and since 2-3 deg tweak in lobe separation makes a HUGE difference...........

He was asking why thers no center or zero marking on the adjustment range - so i take it he wanted to zero the cams without the use of a degree wheel.
He said if the standard sprockets keyway is aligned then the teeth are aligned on the oem units - so the adjustable ones arent manufactured very accurately since they dont align.
Is this correct or am i missing something ?

[5inline]

with the keyways aligned the teeth dont align and the chain doesnt go on without having to adjust a sprocket. that puts the cam into an unkown position.
1 unknown too many to scare my engine builder Mr Dhooma.

Sorry,i still don't get it.
Did he plan to set up your cams just by looking at the adjustment range of the sprocket?
The one i have has a adjustment range of more than 1 full tooth,and since 2-3 deg tweak in lobe separation makes a HUGE difference...........

[Faheemo]

The keyways don't allign on an RS2 in standard form

Is that limited to rs2's ?

[Faheemo]

had a problem ther with that last upload came in abit late

Exactly - he wants as many bolt on products that he knows will work.
With all the modifications i am doing thers too many variables to work out if something does go wrong, say the car does not idle properly.
He's already told me he's not initially putting on my 70mm throttle body aswell.
Going to start the car up 1st and get it to idle and behave like it should then all the fancy stuff can start to come on.

Made sense to me, would save alot of head scratching if u had less untested products on the motor, when the problems start.

[Jamo]

The keyways don't allign on an RS2 in standard form

[Faheemo]

with the keyways aligned the teeth dont align and the chain doesnt go on without having to adjust a sprocket. that puts the cam into an unkown position.
1 unknown too many to scare my engine builder Mr Dhooma.

[Jamo]

I don't understand your engine builder's issue.
It is an adjustable sprocket,not a bolt on product.
He has to measure out lobe center with a degree wheel anyway.

Have to agree there it's not a bolt on product

[5inline]

Chain Sprockets from 034
I have a big problem ther ....
If you align the keyways on the sprockets then the teeth dont align and the chain will not go on properly, and my engine builder refuses to use something that is made without markings and does not fit 100% the first time. (the Allen capped screws wher adjusted to the center position as best visually possible.)
He says he rather do without it at first. to eliminate potential problems.

I don't understand your engine builder's issue.
It is an adjustable sprocket,not a bolt on product.
He has to measure out lobe center with a degree wheel anyway.

[Faheemo]

Chain Sprockets from 034
I have a big problem ther ....
If you align the keyways on the sprockets then the teeth dont align and the chain will not go on properly, and my engine builder refuses to use something that is made without markings and does not fit 100% the first time. (the Allen capped screws wher adjusted to the center position as best visually possible.)
He says he rather do without it at first. to eliminate potential problems.

[dubmeister]

Are you getting one for the chain as well?
034 chain

Used a kent cams set of adjustable chain pulleys on my vw 16v- made good hp gains advancing inlet cam 2 deg as i recall- don't know if kent still list them, about £40 as i remember.. very useful if you are running wilder cams than std..

[Jamo]

I went standard belt size to keep my build simple.

I know Aelred and a few other have a large water pump and crank sprocket to suit a 25mm or maybe large belt.

The friend from sweden, "Adolf" who? :mischeif:

[terrybullwon]

Ok, Did you also go for the 31mm version or the stock 21mm gear?

@ James: A friend from sweden?

Yep

I have the 31mm version and iirc Jamo went for the standard belt size