Idiots Guide To Setting Vernier Pulleys?!?!?

[wardy18 33 1 Cars]

Hi

 

My vernier pulley was set last year usung 3.65mm of lift at TDC in the Inlet Lobe

 

I have now fitted a new block etc and before i have lost the timing marks to back me up which i had put on the belt and pulleys, i need to check the cam timing is correct as i really dont wanna break it

 

I have removed the vernier and put a standard pulley so the engine is timed up as standard using the timing holes, i have then removed the standard pulley and sat obver the vernier and marked the timing notch from teh standard to the vernier, so the vernier is now fitted to the standard position but obviously set to the timing degrees i set last year!!

 

How do i check with the guages etc i have that i am gettin the correct lift!?

 

Ie set the crank at TDC, place the vernier caliper gauge on the follower setting it at zero then turn the crank anti clockwise until the guage stops rising (meaning valve closed) that thats the lift i have set!!

 

BUT

 

this sounds straight forward but looking at the position of the lobe on No 1 Inlet valve if i were to turn this anti closkwise i would be opening the valves and not closing it..............ERM HELP?!?!??

 

thanx

[Sandy 191]

Assuming the belt is fitted and the timing is somewhere near... Turn the crank so that the inlet lobe you want to measure is on the base circle. Position the dial gauge with the plunger depressed nearly all the way on the follower face (as close to the follower axis as possible) and zero the gauge. Turn the crank clockwise until TDC (overlap) on that cylinder is reached and read the lift off the gauge.

Edited April 30, 2009 by Sandy

[wardy18 33 1 Cars]

that sounds like it should give me the results I'm looking for with the position of the cam currently

 

How do you out the lift in mm? I have written on my cam spec 3.65mm lift at tdc on inlet lobe but cant remember how I got to this?

 

Thanx mate

[welshpug 1,662]

find out what it is currently, then move the cam back or forwards till you achieve the desired lift figure @ TDC.

[James_R 3]

look on the website for the cam and they usually spec the TDC lift so you can doubel check.

[wardy18 33 1 Cars]

ive got the cam spec and it says lift at tdc intake 3.80mm exhaust 3.75mm, but then I've written on the page lift at tdc inlet lobe 3.65mm

 

Not sure how I got to 3.65mm, will phone matt at qep I think

[wardy18 33 1 Cars]

Assuming the belt is fitted and the timing is somewhere near... Turn the crank so that the inlet lobe you want to measure is on the base circle. Position the dial gauge with the plunger depressed nearly all the way on the follower face (as close to the follower axis as possible) and zero the gauge. Turn the crank clockwise until TDC (overlap) on that cylinder is reached and read the lift off the gauge.

 

 

this sounds easy enough BUT i have traced the timing mark on the vernier from the standard pulley and fitted it to camshaft ensuring that the belt goes on exactly how it was on the standard one but on the vernier........now doing this means that inlet lobe number 1 on the camshaft (cambelt end) is pointing to the back of the car, so if i was to turn the engine clockwise it would have to rotate 180deg clockwise before it even starts pushin the valve open?!?!?

 

is that right??

 

i suppose in turning the cam pulley 180deg clockwise the crank pulley would be a little before tdc so turning clockwise to tdc would open the valve with the specified lift i need

 

sorry if im not makin sense, im really loosing it with this as i dont really understand what to do but im tryin so hard to!!

[DamirGTI 343]

.. i didn't try this cam adjusting stuff yet so i can't help , but Mr. Croft usually has good guides on "how to" :

 

http://www.guy-croft.com/viewtopic.php?f=3&t=124

 

Damir

[wardy18 33 1 Cars]

just to check, tdc for the crank is when the timing dowel is lined up and all pistons are level within the block?????

 

I've just had a thought that could be wrong as tdc for cylinder 1 is when the piston in 1 and 4 are at the very top of the bore/stroke?????

[EdCherry 34 1 Cars]

Only 2 pistons will be TDC at a time. In this case 1 and 4.

Edited April 30, 2009 by EdCherry

[petert 591]

just to check, tdc for the crank is when the timing dowel is lined up and all pistons are level within the block?????

 

 

Nooooooooo......................that's 90 deg. BTDC.

 

http://www.taylor-eng.com/xu9j4/finding_tdc.html

[wardy18 33 1 Cars]

of course, how could I be so stupid, so set the belt as per timing dowels then turn via the crank clockwise until the inlet lobe is on the base circle then set the dial guage to zero on the follower then continue turning the via the crank until piston 1 at tdc and read the lift.........

 

Or with the belt off set piston 1 to tdc (making sure the camshaft is secure) then set the desired left for the number 1 inlet valve then fit the belt

 

Does that sound right

 

Sorry for gettin confused and being thick

[wardy18 33 1 Cars]

Nooooooooo......................that's 90 deg. BTDC.

 

http://www.taylor-eng.com/xu9j4/finding_tdc.html

 

 

i dont remember by flywheel having those extra set of teeth, it just has notches with a single or double timing mark, however i have a Helix Alloy flywheel which has no marks at all so i cannot use this method to achieve TDC, will have to be the old fashioned Dial Gauge down the plug hole!!

 

so how do you take into account the piston dwell when working out tdc, do you mark the start of the dwell and the end of the dwell and then used tdc as the centre point of these or...............??

[Sandy 191]

Paint dab the flywheel teeth either side of TDC at the same dial gauge reading; eg 1mm, then take the mid point between those marks as TDC.

[wardy18 33 1 Cars]

well its all now timed up and all marks etc etc have lined up, it turns out that with the catcam and vernier pulley the timing is about 1 tooth advanced on the cam pulley

 

3.80mm minus 0.15mm valve clearance = 3.65mm lift at TDC on inlet lobe

 

just gotta check and re check and then fully turn over by hand the fire it up and quickly run it in!

[ifcho 0]

and do you have an advise how to set it up properly when a dial gauge is not available?...and not only that, but I can't find the the lift at TDC spec on the newman cam I purchased (tarmac rally spring cam) http://www.newman-cams.com/pdf/peugeot.pdf

I think I may try to set it up, based on the timing setting?

[wardy18 33 1 Cars]

there 2 ways of doin it, but either way u need a dial gauge and magnetic mount to get done properly!

 

Your cam inlet lobe number 1 (1st inlet closest to cambelt) must be at max lift (pushing the follower down maximum it can) at 110deg after tdc

 

Ill link the procedure for this tomorrow

[ifcho 0]

I got the idea I will try to find a dial gauge these days

[Sandy 191]

and do you have an advise how to set it up properly when a dial gauge is not available?...and not only that, but I can't find the the lift at TDC spec on the newman cam I purchased (tarmac rally spring cam) http://www.newman-cams.com/pdf/peugeot.pdf

I think I may try to set it up, based on the timing setting?

If it's the same grind as they supplied me for Sean's, 110 degrees on the inlet will be 3.84mm with 0.2mm clearance.

[Stu 18]

there 2 ways of doin it, but either way u need a dial gauge and magnetic mount to get done properly!

 

Your cam inlet lobe number 1 (1st inlet closest to cambelt) must be at max lift (pushing the follower down maximum it can) at 110deg after tdc

 

Ill link the procedure for this tomorrow

 

Isnt number one at the flywheel end?

[welshpug 1,662]

yup, not that it matters really when setting cam timing/lift @ TDC if you've already set the belt properly.

Edited May 7, 2009 by welshpug