Firing order

[cwin]

does anyone know the firing order for a speed six engine ?

[Quentin1]

Something is not right here. I did answer to this particular thread a few days ago...

Anyway:

1-5-3-6-2-4

Have in mind that on the Vauxhall coil pack two cylinders are interchanged for the TVR installation. I would have to look up which ones. The numbers stamped on the pack do NOT match for those two!

Regards,
Björn.

[Phil Tudhope]

I know this is a really old thread but I came across it looking for something else and am intrigued.

The coil pack, which comes from a Vauxhall V6, is numbered like this :
135
246

The vauxhall V6 has a firing order of 123456. This suggests the coil pack is firing in sequence top-bottom and then along the row.

The Lead connection order using this coil pack for the TVR Speed 6 is :
135
642

This suggests the firing order is 163452 and not 153624 (as you would expect for a straight 6).

Can anyone point out why the above anomaly exists? Is it doe to an unusual cylinder numbering on the Vauxhall V6?

Regards
Phil.

[Quentin1]

Phil,

coil pack is numbered

1-3-5
4-6-2

(If you look at it being installed to the engine, since the numbers are written upside down then.)

Then for the Speed Six number 4 and 6 are interchanged.

Which means the leads are installed like

1-3-5
6-4-2

Which means my firing order is rubbish, and should be

1-6-3-4-5-2

Björn.

Edited by Quentin1 on Thursday 5th January 14:48

[dpd3047]

The system is waisted spark wich means 1 and 6 fire together 2 and 5 3 and 4 so you need to pair the coils. 1 and 6 are at tdc, 2 and 5 are at tdc, 3 and 4 are at tdc,hope that explains it .

Edited by dpd3047 on Thursday 5th January 20:44

[Quentin1]

So it is more like:

1+6 - 3+4 - 5+2

Makes sense when looking at a SpeedSix crankshaft. Thanks.

Edited by Quentin1 on Friday 6th January 06:46

[EvoOlli]

Hello Björn,

on the ignition coil, every connector of one column fires at the same moment, so if the connection of the leads is:

1-3-5
6-4-2

the order can't be 1-6-3-4-5-2, because between 1 and 6 (and 3/4 and 5/2) should be 360° crankshaft rotation.

So your first idea of 1-5-3-6-2-4 is possible....