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JT

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Reply with quote  #1 
Hi all.
What ignition timing are people running on there 2ltr pintos?
I've got mine set 2 10 degrees, as running super unleaded. I've only been out for a couple of very short runs and feel its a little advanced.
Not having any major issues, I'm just interested really.
Thanks
Joel
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overdriver

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Reply with quote  #2 
Hi JT,

As you haven't had any response I thought I'd throw in my twopenn'orth.

Whilst 10 deg. BTD static is a reasonable benchmark, much will depend on your set up - current ignition type, carbs, cam etc. For example, specialist camshaft manufacturers may specify particular settings. The ideal approach is to book a session on a rolling road with a reputable tuner.

However, you may in the first instance like to have a look at this article which, although somewhat dated, provides a good insight into the topic and makes for interesting reading.

http://www.s262612653.websitehome.co.uk/DVAndrews/timing.htm

One point of contention is the question of whether or not to use the vacuum advance in the case of an original Ford distributor. General consensus is that it should be disconnected (with any resultant apertures sealed of course).

Michael.

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JT

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Reply with quote  #3 
Hi michael

Thanks for the link that does look interesting, i will have a proper read in due course.
The engine is pretty stock other than twin 40's.
Dissy is mech advance I've disconnected the vac.
I am planning a rolling road run when were all aloud out to play. I'm pretty familiar with all this stuff i was just interested to know what others were running really, and thought this might make a semi interesting topic. I think from memory the sierra haynes manual states 6 deg for regular unleaded and 10 for 4star 97ron. I ran 12 deg on my last kit car which had a stock 2ltr and the starter struggled to turn it over at times.
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overdriver

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Reply with quote  #4 
Sorry if I appeared patronising Joel; TOC is a 'broad church' of technical skills and knowledge.

As my old strobe light packed up some time ago, I can't check my current settings. I seem to recall that with my Piper 285 cam ignition was set to c. 14 - 15 deg BTDC at an idle speed of c. 1000 rpm with a maximum advance in the range of 36 - 38 deg at 3500+ rpm. A Pinto with a standard cam will probably happily idle at around 600 rpm and be firing at 12 deg BTDC.

Incidentally, my Haynes manual quotes 'at idle' figures for 2 litre carb engines of 4 deg BTDC pre-1985 and 6 deg post-1985 on 95 RON Premium unleaded.

Michael.

 


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JT

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Reply with quote  #5 
Not at all, i appreciate the input. Thanks for the figures, i find it interesting to know what your running.
Ive not had my tiger all that long so have been ironing out years of bad maintenance.
The cam is something i would like to upgrade how does your 285 perform?
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overdriver

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Reply with quote  #6 
Can't really compare the Piper with anything else (Kent, Newman etc.) as it was fitted when I got the car. I have re-built the engine which enabled me to set the cam accurately (vernier pulley is crucial I would suggest). Previous owner supplied a rolling road graph showing 140+ bhp which I think may have been a tad flattering.

When I had the rolling road set up by Mick Mobberley at Hi-Tech Motorsport he suggested tweaking it more towards mid-range performance with a resultant 132 bhp @ 5950 rpm and max torque of 132 lb/ft @ 4220 rpm. It certainly pulls strongly and smoothly from 2000 rpm. The only problem being initial 'cough' and roughness at constant low revs - it absolutely hates cruising at 30 - 40 mph - but I think this is ignition related. Hence the next step being to consider Megajolt, Nodiz or whatever.

Michael.

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vji4058

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Reply with quote  #7 
Had my pinto cat rolling roaded a few years back, can't remember figures but also hates 30/40 but loves 50/60 and the odd blip over this to overtake etc. Think it helps what diff you have as well. I find all the gears are usable and the right speed gain in each gear and cruises well in 5 rd and pulls well in each gear. The donor I built it from was a 4 door saloon.
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