X Flow Timing with Aldon ignitor

[Tony sei]

Hi Guy's

Done a search but unable to find anything!

But I'am sure i;ve seen it somewhere.....

Fitting  Aldon Ignitor (Solid State Ignition), and want

to know what to set the static timing at.

Spec - Aldon distributor, 1700X Flow, mild cam

twin 40's.

Seem to think i've read 13 deg BTDC, is this right?

Thanks in anticipation

[Blatman]

Er, same as it was for points. Adding an Ignitor won't alter the timing requirements of the engine from standard.......

[Tony sei]

Yes. I suppose thats what I what to know,

what is the standard setting ??

Regards  Tony

[Mark Williamson]

Tony,

I always timed my X-Flow to 14deg BTDC.

Cheers

Mark.

[Tony sei]

Thanks Mark

[worzel]

The static timing will depend on the type of fuel you're using and the full advance that your ditributor provides at higher RPM.  If the timing is too far advanced then the engine will pink.

You may find that 14 degrees is too much - but try it and see/listen .   I set mine to 10 degrees BTDC (standard) and have similar spec engine to yours (mines unleaded).  

A rolling road set-up will help get the optimum.  Just set mine up at Redline.  122 bhp at the wheels - not bad for a mild cam

Steve

[davef]

Hi Tony, my crossflow is fitted with 270 cam twin 40 webers gas flowed head vernier sprocket for accurate valve timing my timing is set at 20 degrees btdc at 900 rpm,timing advance in dizzy has been reduced to 16 degrees giving 36 degrees total advance at max revs which is about what you need in a xflow. cheers Dave.

[trevornewman]

Keep seeing redline mentioned where are they

and do they come highly recommended

one shortlived track day left me with lose unleaded valve seats and cracks between intake and exhaust valves

I need to find someone whos familiar with the xflow and weber jetting

not interested in obtaining the maximum bhp figure i just want it to be able to take a sound thrashing on trackdays, without eating heads and spark plugs in 3 laps  

wish i had bitten the bullet and thought about it before the trackday but since a strip down its reavealed unleaded seats that really had no place (or room) in a modified head with inlet valves (cant remember the size) that almost touching the exhaust ones

BTW i live in the M3 J4 farnborough area so somewhere reasonably within the area would preferable

but mileage is nothing against a recomendation from several satisfied customers

[Paul Ash]

Vulcan 135bhp engine (driven very carefully cough cough!!!

234 cams

Aldon 103fxy & s Dizzy 14 deg BTDC @ 900rpm 48-54 Dwell

0.15 points gap (but guess you wont need the last two bits of info for solid state)

If you give me your dizzy model I have aldons spec sheet at hand.

[worzel]

Trevor,

Redline Rolling Road is in Iver, Bucks.

Tony knows his stuff their, but you'll not get a print out - just a dammed good thrashing.  Sorry tel. No. not to hand.

Steve

[Tony sei]

Thanks Guys for all the replies,

Looks like the general consensus is 14 Deg BTDC

Contacted Aldon and they think the same.

Will set to this and give it a try.

Am also taking off the inlet manifold with

webers to gain access - is this a first?

Tony

[fordy]

youll have to drain the cooling system down if your taking the inlet manifold off - in case you didnt know.

cheers chris

[Paul Ash]

No need to remove manifold if all you are doing is the timing!

Also you will want the engine running to do this with a timing light.

It is a little awkward to get to the pinch bolt but certainley doesnt warrant taking the manifold off IMO

[worzel]

Hi Tony, my crossflow is fitted with 270 cam twin 40 webers gas flowed head vernier sprocket for accurate valve timing my timing is set at 20 degrees btdc at 900 rpm,timing advance in dizzy has been reduced to 16 degrees giving 36 degrees total advance at max revs which is about what you need in a xflow. cheers Dave.

I'm currently running 10 BTDC and have had some problems with midrange fuel enrichening and poor response.  My rolling road guy told me that my carbs were knackered and because I wanted another opinion I spoke to a very knowledgable guy from Norris Motorsport who stated that timing should be as Davef says, 20 BTDC with 36 deg total advance.  

This will make the engine more responsive and give better low down torque.  Hopefully this should sort my CO issue (my carbs should be OK - I can explain how if anyone wants to know).  I'll be stripping down my dizzy this weekend and have a go at adjusting the advance curve

Steve

[Tony sei]

Paul,

My Dizzy is an Aldon 103FXYS, what I would like to know

now is the max mech advance of this dizzy???

(You mentioned you had a spec sheet)

Have tried timing at 14 deg  and 10 deg BTDC but neither

seems right. Quite tempted to try more advance, but don't

know how far I dare go......

Did fit the ignitor by removing the Carbs inc. manifold

this made the access to the dizzy great.