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PostPosted: Thu Sep 05, 2019 8:57 am 
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Joined: Tue Sep 03, 2019 11:45 am
Posts: 4
Car Model: 1962 Saab 96 De-Luxe
Hi All

Recently joined the forum and couldn't find a thread related to the issue I have with my 2-stroke Saab so thought I would start a fresh one...

I have a 1962 LHD Saab 96 bullnose 2-stroke that I imported into the UK following my return to the UK after working at Saab in Trollhattan from 1998-2003. I have completed a number of maintenance jobs on the car, including fitting the classic saab racing petronix ignitor to replace the points and a matched new coil (all acquired direct from Petronix after a conversation with a UK rep). I had previously ordered and bought a variant of the ignitor from classic saab racing a good few years earlier, but realised when I came to fit it that they had supplied the wrong part (my car doesn't have vacuum advance). Too late to exchange so ordered new parts direct from petronix.

Since fitting, and messing around with the distributor position, my dad and I finally got the car running nicely, or so we thought! Initial runs in the car found that it was response and running well, but on driving to the Saab GB Owners Club 50th Anniversary event I found that when accelerating with anything more than half throttle travel in 3rd and 4th gears (yes, my car has a 4-speed box fitted) the car revs would just die and the either cut out or pick up again once the revs had dropped. This continued then for the rest of the journey there and the journey home. However, at idle in traffic the car would idle absolutely fine and rev fine. For various reasons the car remained off the road for a couple of years (brake issues). It is now back on the road (all new brake wheel cylinders, shoes relined and master cylinder seal kit fitted). I then had an overheating problem (outlet of water pump completely gunked up with solidified coolant). Now fixed! However, on testing the car, my initial joy at the new brakes and cooling system performance was short lived when I realised it still had the running cut out issue. On top of this, it has also developed an annoying habit of failing to re-start shortly after pulling up and switching off somewhere after a drive.

So, what can I tell you about the car. Well, my dad and I have investigated all fuel flow and other issues and it appears that the new fuel pump (fitted at the same time as the ignitor) is performing correctly. The only thing we have spotted that seems a bit odd is that the centrifugal weights for advance / retarding the ignition have been welded in place preventing movement. My gut feel at the moment is that this is the cause of the problem and that we may have set the timing for a good idle but the timing for higher speed higher throttle inputs is not able to adjust as it would with the centrifugal weights. So, should we adjust the timing to make it less robust at idle but then better for higher speed / throttle? I think at some point the car must have been used for racing as it has got a cut-off switch fitted, appears to have a skimmed head (have to run it with a classic saab racing annealed brass head gasket as it just destroys the standard ones) and also has a window cut out of the air filter "saucepan" housing. It is still running a single carb. Did wonder if the jetting in this could be wrong, but don't know enough about this to be honest.

Sorry for the long opening to the thread, but wanted you to have as much detail as possible about the car. When I can work out how to attach pics I will do so. In the meantime if anyone has any good ideas about the higher speed / throttle issue and also the hot start issue I would very much appreciate your feedback so I can finally get the car running properly and use it with more confidence! I desperately want to show the car more!

Cheers. Tony


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PostPosted: Thu Sep 05, 2019 11:31 am 
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Light Pressure Turbo

Joined: Sun Mar 05, 2006 10:52 am
Posts: 380
Location: Cleveland North East
Car Model: 99T
This may help ?

viewtopic.php?f=12&t=188990

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only 1 saab now...99 Turbo
plus a Merc, Audi B4 Quattro and E Type Roadster


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PostPosted: Thu Sep 05, 2019 11:37 am 
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Light Pressure Turbo

Joined: Sun Mar 05, 2006 10:52 am
Posts: 380
Location: Cleveland North East
Car Model: 99T
Or this....................

https://www.youtube.com/watch?v=5krz0vd6VTc

but you will need a ball point pen :)

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only 1 saab now...99 Turbo
plus a Merc, Audi B4 Quattro and E Type Roadster


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PostPosted: Thu Sep 05, 2019 6:55 pm 
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UKS Addict

Joined: Fri Aug 05, 2005 6:51 pm
Posts: 2672
Location: Cheshire
Car Model: Saab 900 and 99
With the engine nice and warm carry out a compression test on all 3 cylinders, this way you will have an idea of the health of the engine and if it has been tuned to any degree.

With a fully locked out distributor set the timing at 18 deg.

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99 '83 Turbo Killer
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Lancer EVO 6.5 TME '00 in red
Lancer EVO 6.5 TME '00 in black


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PostPosted: Tue Sep 10, 2019 8:45 am 
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Joined: Tue Sep 03, 2019 11:45 am
Posts: 4
Car Model: 1962 Saab 96 De-Luxe
Thanks for all the replies. Some extremely useful information there. Seems like 18 deg BTDC is the magic number so will give it a go when I have some spare time and report back on progress.

I will be taking the car to Hinckley Classic Car Show this coming Sunday (15th Sept) if anyone is nearby and wants to have a look.

Thanks again for the replies, much appreciated

Tony


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PostPosted: Tue Sep 10, 2019 1:54 pm 
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Joined: Mon May 17, 2004 8:34 am
Posts: 3596
Location: West Dorset UK
Car Model: 96TT/900S Cabrio/9-3SW Aero
Good luck with your stroker - concur that they're great fun. As you've sorted the ignition side of things (although you don't mention which plugs you're running with your tuning setup), have you sorted the carb? Possibly worth a good clean & some new gaskets to ensure that there aren't any air leaks that are affecting the mixture as revs increase. Throttle spindle housings do wear & it is possible to have it re-sleeved; repair kits may also be available. My first port of call these days is the Swedish Saab Club (SSK) - you have to be a member to buy spares but it's quite cheap at around £20 pa - Google Translate works ok on their site. Malbrad, Graham Macdonald & a few other 2T specialists also trade in the UK; all are very helpful.
Hope this helps. I'm not an expert on strokers but have had mine for 9 years & have managed to sort out most issues (with help!).

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David.
96 2T / c900S Aero Vert / 9-3 Aero TTiD SW.


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