Need Help With Timing

[burr_2000 1]

does anyone know or can send me a link on how to set cam timing using the adjustable vernier pulley, i am trying to set up my 1360 TU engine. preferably a idiots guide .

[welshpug 1,737]

have you got the full camshaft specs?

[burr_2000 1]

yeah its catcams 4900645

 

duration (0.1mm)

280 / 280°

 

duration (1.0 mm)

244 / 244°

 

maximum lift

11.25 / 11.25mm

 

lift at TDC

2.65 / 2.65mm

[welshpug 1,737]

ok, have you got a dial gauge?

[burr_2000 1]

yes

[welshpug 1,737]

I found this useful link a while ago when I was looking how to measure my gti6 cams http://www.alcester-racing-sevens.com/cam_timing.htm

 

It does show a twin cam engine, but the principle is the same.

 

 

the way I would do it is;

 

Find and accurately mark TDC on the crank pulley for the appropriate cylinder;

 

I would do this by bringing the piston to the top of its stroke (just as the inlet lobe starts to open the valve)

 

Pre-load the dial-gauge to the top of that piston by a few mm (say 10mm, depends how long the stroke is on your gauge)

 

Rotate the crank forwards till you reach half the pre-loaded figure (imagine we use 5mm for arguments sake), mark the pulley, then keep turning through nearly a full circle till you reach the same 5mm measurement away from tdc, mark the pulley again.

 

True TDC will be half way between the two marks, the piston does reach and stay at TDC for a few degrees each side which is why this should be done.

 

 

 

When you have done that, set the dial gauge on the top of the valve as close to the line of the valve stem as possible, pre-load the gauge as appropriate then Zero it.

 

Rotate the crank until the cam lobe comes up and opens the valve, make a note of the lift as the crank pulley reaches the mark you made at TDC.

 

adjust and re-check as necessary

 

 

 

**removing all 4 plugs will make it easier to turn over

Edited March 18, 2010 by welshpug

[burr_2000 1]

ok thanks dude, i will try it