Cylinder head problems

[Stevin]

http://www.e30zone.co.uk/modules.php?na ... ic&t=36050

Here is the link 2 the thread I made, in the E30 Chat... I think it has become a bit more techinical so I thought I would post about it here.

U think the timing on the vernier has been made wrong ?

[Gt6s]

U think the timing on the vernier has been made wrong ?[/quote]

The link wont work for me but.

Bit of a contradiction there !

The idea of the vernier is, you do the timing !!

[Stevin]

Well the vernier still has 2 be set 2 std, and then 2 set the cam timing so that u don't hit the pistons against the valves... the vernier is only able 2 adjust the timing a few degrees.

Anyways I checked the Vernier against a std Cam pulley... and the idiots that made it for me made the timing mark on completely the opposite side of where it is supposed 2 be

[Gt6s]

Well the vernier still has 2 be set 2 std, and then 2 set the cam timing so that u don't hit the pistons against the valves... the vernier is only able 2 adjust the timing a few degrees.

Anyways I checked the Vernier against a std Cam pulley... and the idiots that made it for me made the timing mark on completely the opposite side of where it is supposed 2 be

I asume you are comparing mark position to key position. The verniers adjustment should allow adjustment every degree between two teeth AT ABSOLOUTE MINIMUM. With a vernier wheel, mark on wheel means virtually nothing only an aprox refrence mark.
YOU DO THE TIMING !!
That is the point of a vernier wheel.
YOU DO THE TIMING !!
What about removing the clamping screws and turning 180 degrees on hub to correct, would that work ? If 4 or 6 (even No's) clamp screws, it should.

Also to find general initial cam position ( WITHOUT MARKS ) cylinders 1&6 @ TDC with no6 on overlap = firing point no1.
BASIC STUFF !!

("Firing point no1" is a general term refering to TDC, start of the power stroke on the primary cylinder).

Other points. If you originaly posted this subject on chat and it got too technical for you.
Why have you re'posted this on TECHNICAL HELP ????
If this simple mark throws you, I cannot wait till you get to finding correct and exact cam position. No marks there boyo.

Even TDC should be properly and correctly identified (MARKS DISREGARDED) with a dial guage (exactly 1/2 way piston reaching and leaving top of bore). Rather than the production aproximations of timing marks, variatons caused engineering tolerances.

You are trying to use a vernier wheel without grasp of the basic principals.

I feel you need to ask yourself the question. Should I be attempting this task ?

[Stevin]

Haha... yes if u say so.

I don't get how u dont' understand what I'm talking about... seeing as what I said is basically what u said.

And anyways... spoke 2 a BMW Master Technician on sat and he says there is no point in a Vernier as the Motoronic will just retard the timing itself.

He says thats why u fit a chip, so that is advances the timing and doesn't let the ECU retard it again.

U know what... by ur attitude u seem 2 think u know it all... and u assume this is the first motor I've ever built... I've built far 2 many 2 mention.

Just the first time I've ever fiddled with a vernier.

[Gt6s]

Haha... yes if u say so.

I don't get how u dont' understand what I'm talking about... seeing as what I said is basically what u said.

And anyways... spoke 2 a BMW Master Technician on sat and he says there is no point in a Vernier as the Motoronic will just retard the timing itself.

He says thats why u fit a chip, so that is advances the timing and doesn't let the ECU retard it again.

U know what... by ur attitude u seem 2 think u know it all... and u assume this is the first motor I've ever built... I've built far 2 many 2 mention.

Just the first time I've ever fiddled with a vernier.

Nope dont clam to know it all.
But have timed the odd quad cam.
This is ONE you are doing.
I know enough to realise that the ecu can not retard the CAM TIMING.
As your MASTER TECHNICIAN implies.
Or have you fitted vanos ?

[Gt6s]

Right was able to find your original post on chat.
A few things I see here.
You are using 4 valve pistons, can not tell from photos, but.
Have you had valve cutouts in pistons modified to accept the two valve head, it dont look like it ?
If pistons rise fully in bores you will need to do this
Your vernier (AGAIN) IGNORE ORIGINAL MARK.
Or (AGAIN) turn sprocket 180 deg on hub.
Also going by photos of vernier slots a bit off centre on a couple of screws. Not that that shoul really matter.

[Stevin]

Ok, motor complete except for the alternator and clutch and flywheel.

No clearance issues with no pockets in pistons... just like 325iS Evo's... that I've built.

Cam Timing is spot on threw the damn vernier away... wasn't in the mood 2 fiddle with it.

Was also thinkin how u gonna adjust it once everything is in... it's quite a mission, gotta remove the dizzy, and the timing covers... just 2 change the cam timing.