Timing An 8V After Rebuild

[mikeyd 13]

trying to time up an 8 v xu engine with a newman 280 degree cam [made by piper as i discovered after installation!!!]-locked crank with pin @tdc and vernier marks are at 12 oclock[very close to standard engine i compared to]

however i am a bit concerned that the white marks on cambelt which lined up initially do not seem to line up after turning the engine over a couple of times

any advice welcome

[petert 588]

Probably because there are 113T on the cabelt and 42T on the cam pulley. You should be more concerned about making sure the cam is timed correctly by either measuring the valve lift @ TDC or the lobe centre line angle.

[tony perks 1]

dont worry about it being marked as piper, they both companies use the same blanks, i had the same thing and asked ken at newmans .

[hanceformer 0]

Forget about the cam an time it like it's got the original one in it. I have an xu10 an this engine times with the pistons dead level. Weather it times dead level or tdc it doesn't matter. Get the pistons dead level or tdc lock the cam and put the belt on. Turn it twice by hand and if the valves don't touch it's safe to start. U will know if the valves touch the piston because by hand u won't be able to turn it. Take all plugs out when turning by hand to make it easier. Job done

[petert 588]

Turn it twice by hand and if the valves don't touch it's safe to start.

 

Geez cousin, you've been watching too much Bush Mechanics.

[harryskid 193]

Geez cousin, you've been watching too much Bush Mechanics.

 

[hanceformer 0]

Petart I got that info on here and it worked for me so thought it might help someone else but if u have a better way then please do tell.

[petert 588]

The idea is to NEVER let the pistons touch the valves. If you did so in an 8V you're a long way out on the cam timing. On a GTi6 you'd bend the valves. The safest way is to fit a standard pulley and pin it, and the crank up as normal. Fit the belt, turn it by hand a few times, return the pin positions. Then remove the standard pulley, keeping the cam still, and fit a vernier pulley.

 

Have you ever watched Bush Mechanics? Great show!