47 replies to this topic

[Artful Dodger]

It's one or the other! The actual firing order will be determined when the cam is installed:)

Why do you want to know this?

[Noah]

I have to agree with DILLIGAF.

He want's to find TDC, if a DTI gauge is good enough for JanSpeed. It's good enough for me.

[jaydee]

LOL 3 pages about finding TDC
If you fit a DTI in the spark plug hole you're likely to ruin it

[MRA]

How do you find tdc on a new engine build, when you don't have a cam installed yet, and you want the correct
tdc?

I use a DTI on the topof the piston, directlyabove the gudgeon pin centre line, take an angular reading at about 0.040" down the bore on the "upstroke" then turn it over the top until it drops down to 0.040" and take another angular reading, add the 2 readings and divide by 2, turn it all the way around until you get to this "new" reading on your vernier timing wheel, your crankshaft is now at true TDC,

NOTE !

1) Measurements MUST be taken directly over the gudgeon centre line.
2) Both dislacements MUST be the same figure, and not too small, not too big either.
3) All measurements MUST be taken by turning the crankshaft in the same direction.
4) Do not be tempted in to turning the crankshaft back the other way....
5) Mount all measuring equipment securely and all DTI's inline with the direction of measurent, ie vertically on a piston crown

Edited by mra-minis.co.uk, 08 March 2013 - 10:56 AM.

[MRA]

The OP is setting up a timing wheel for an ECU, using this procedure will not be very accurate, and if the scope of the ECU is not wide enough to cope then the wheel will need to be moved again....

Isn't it better to get it correct to start with, if you look on the bottom pulley and timing cover you may (earlier engines as Cooperman has stated will have this on the flywheel) find timing marks, just line up the little notch on the bottom pulley with the zero pointer, this is the longer point of the "bunch"

Edited by mra-minis.co.uk, 08 March 2013 - 10:54 AM.

[Artful Dodger]

The ECU has a large adjustment range. It doesn't need a DTi gauge and to be super acurate

[MRA]

The ECU has a large adjustment range. It doesn't need a DTi gauge and to be super acurate

Can it be adjusted in both directions ?

[Artful Dodger]

Yes more than enough. I think it's two teeth on the reluctor wheel either side of TDC.

[jakejakejake1]

I think Nodiz can be adjusted +/- 20 degrees or so, but obviously the closer it is initially the better.

[o0OWILKSO0o]

Guys just come over to Germany and you can do it for me, I'll provide tea, biscuits and a none fritzel-style cellar.

Ive seen where you are .... Are you with 19 regiment ?

No bud The Queen's Royal Hussars.

[o0OWILKSO0o]

What happened to this thread lol. I think I'm more confused than when I started.

[Cooperman]

To make it simple for the OP so that he can set his ignition for initial start-up do just this:

Take no.1 plug out, get a pencil and position it through the plug hole so that it is as vertical as possible.
Turn the engine until the pencil is as high out of the plug hole as it will go. Mark the position on the front pulley against a fixed point. Repear a few times and take the average.
That is quite close enough as it will be within a couple of degrees + or -.
Set the ignition to nominal, say 6 degrees BTDC and run the engine. Fine tune/map it accurately on a rolling road when convenient.

I hope this helps you and is an answer you can accept.

[o0OWILKSO0o]

Cheers that seems to have cleared things up.

[jaydee]

Please check that BOTH valves are closed, you have two TDC's, one with valves open and one with valves closed, which is the one you want.

[o0OWILKSO0o]

Please check that BOTH valves are closed, you have two TDC's, one with valves open and one with valves closed, which is the one you want.

That I dont know, I will have to check withe the Nodiz guys.