Trigger Wheel fitment on a V8 wedge

[rev-erend]

All,

Here are a few pictures of my trigger wheel and bracket ..

Mounting bolt holes to the right of the pulley


What was removed from the rear of crank .. and also note I used a spacer between the crank damper and the trigger wheel.


bracket mounted without the sensor


Sorry - forgot to take a picture of the bracket with the sensor

Hope they are of some use to someone..

and before anyone asks - yes that is carpet on my garage floor ..

Edited by rev-erend on Wednesday 24th October 16:26

[TVRleigh_BBWR]

hehehe you got enough weld on that joint.
Looking good though.

[rev-erend]

TVRleigh_BBWR said:

hehehe you got enough weld on that joint.
Looking good though.

It's a optical illusion..

It's a right angle bracket .. so you are seeing the side.

I actually filed off a load of the weld on the inside of the 'L' also welded the outside joint too..

[ed_crouch]

A-ha, so it looks like the wedges are fitted with the 6-bolt pulley! Ta.

Mine looks identical to that, but didnt have enough neck vertibrae to get eyes on the centre of the pulley hub.

Ed.

[rev-erend]

ed_crouch said:

A-ha, so it looks like the wedges are fitted with the 6-bolt pulley! Ta.

Mine looks identical to that, but didnt have enough neck vertibrae to get eyes on the centre of the pulley hub.

Ed.

Don't know if they all are..

Mine is a 4.6 cross bolted made in 1996.. and yes it's 6 bolt. I had to buy longer bolts as the existing bolts were too short.

[Wedg1e]

rev-erend said:

TVRleigh_BBWR said:

hehehe you got enough weld on that joint.
Looking good though.

It's a optical illusion..

It's a right angle bracket .. so you are seeing the side.

I actually filed off a load of the weld on the inside of the 'L' also welded the outside joint too..

I hope it's an alloy bracket, think of the weight...

[deetes]

I've got to do this soon. How did you figure out the position of the missing tooth on the trigger wheel? Another one, is that the TDC mark at the top?

Edited by deetes on Thursday 25th October 06:43

Edited by deetes on Thursday 25th October 06:44

[rev-erend]

On the Emerald for a V8 it's 90 degrees from TDC.

I've also marked 20 degrees after these shots as they
had a set-up that just runs the engine at 20 degrees - to make sure the trigger wheel is aligned correctly (with a timing gun).

Yes - it's alloy and so light compared to steel.

[TVRleigh_BBWR]

nice use of tipex

Do you have any pics with the sensor fitted.

Edited by TVRleigh_BBWR on Thursday 25th October 12:14

[ed_crouch]

Presumably the trigger wheel is ferrous though!

Ed.

[deetes]

http://www.pistonheads.com/gassing/topic.asp?h=0&a...

There was some discussion on the above topic regarding balancing the pulley after the fitting of a trigger wheel. Any thoughts?

[rev-erend]

ed_crouch said:

Presumably the trigger wheel is ferrous though!

Ed.

Yep - the trigger wheel in steel I know because I welded the bolt heads to it ..

I was not convinced by the balancing argument.

It all stemmed from one guys broken 5.0 crank but they are known to not be as strong as they might be and the way TVR balance they is as a whole assembly -

pulley, crank, flywheel - as a whole. It's a cheap and quick way of doing the job.

If you wanted to do the job properly you would balance them all individually and then add a competion balancer rather that the rubber steel jobbie that is fitted on there.

[Pagey430]

I'm in the process of fitting an Emerald ECU and my first task is to fit the trigger wheel. Seemed pretty straighforward 'till I start getting into the detail of where the missing tooth goes in relation to the sensor. My understanding is this should be 90degrees BTDC ie the sensor sees the missing tooth 90 degrees before no1 piston reaches TDC. So (this is where I get a bit ) when my sensor is mounted at say 1 O'clock to the pulley wheel (along with the missing tooth) the TDC mark on the pulley wheel should be at 7 O'clock (180 degrees), then 90 degrees of rotation will put the TDC mark on pulley in line with timing pointer which is at 10 O'clock (on my engine)

Drawing it out on a piece of paper helps but is this the right way of looking at it of have I missed something along the way??

Engine is a 430

Must go lie down

Really appreciate any help

All the best

John

Edited by Pagey430 on Tuesday 27th November 19:30

[GreenV8S]

Put the engine at TDC#1. Fit the sensor wherever it's most convenient. Fit the trigger wheel so that the missing tooth is 90 degrees before the sensor (i.e. rotating crank 90 degrees clockwise as seen from the front brings them together).

You will probably find that the thing that is supposed to align is the trailing edge of the first tooth AFTER the missing tooth.

You will probably find that the ECU isn't too fussed about it being exactly 90 degrees.

If you get it a long way out you can just set it up on another cylinder and move the output connections around one cylinder.

Some ECUs have a range of positions that simply won't work i.e. the missing tooth signal must not occur within the range that you want a spark to occur. It would be worth knowing in advance whether yours cares, because it would be something worth double/treble checking if it is.

[Pagey430]

Many thanks Pete but my wierd brain is still thinking that will cause the sensor to see the missing tooth 90degrees ATDC. I'm sure your spot on but I just can't see the logic.
I need to understand something before I put into practice...looking forward to getting it all set up tho....can't wait

[Graham]

IIRC you can fit the missing tooth on the on the trigger wheel anywhere and sort it out in the software settings..

[GreenV8S]

Pagey430 said:

Many thanks Pete but my wierd brain is still thinking that will cause the sensor to see the missing tooth 90degrees ATDC. I'm sure your spot on but I just can't see the logic.
I need to understand something before I put into practice...looking forward to getting it all set up tho....can't wait

You are absolutely right, which proves you understand it better than you thought!

[Pagey430]

[TVRleigh_BBWR]

Ok got the Trigger wheel fitted to the later style pully

[gsx600]

No welding this time ?

Looks a lot easier with the pulley off - one day I'll even get that far