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Date: 7 Jan 2003 02:55:52 GMT
From: davehinznopsamcop.net
Subject: Re: SAAB 2-strokes: how polluting are they?


Someone who looks an awful lot like Scott <mtnbikernopsamete-nospam_triad.rr.com> wrote: > These are all good ideas - thanks. I agree that the later oil injected > motors are the way to go, though I suspect they will be the hardest to track > down in the States. John brought up an interesting point about the exhaust: Actually, I see more of those than the mixers. Maybe it's just me... depending on where in the states, I could probably scare up a standard block & crank if the motivation was right (putting a car on the road). > I recalled seeing something of this sort in my research and a bit of digging > turned it up again. At www.classicsaabracing.com they offer a PDF tuning > manual that they developed in working on their 93 (apparently - my Swedish > doesn't go much past 'skol') and in it there is a photo of what certainly > looks like an expansion chamber hooked to the exhaust headers. Nice, thank you. Swedish is a bit odd for me, but it's close enough to Norwegian that I can pretty much read it. Hadn't seen that link before. Chilton's also has some good tuning info for the strokers. > The plumbing must get a bit complicated but if the chamber is shaped > properly you'd get an exhaust gas recirculation system and a supercharger > all without adding any moving parts. Very much in the spirit of 2-stroke > motors in its simplicity. It would again suggest taking Dave's advice on a > later engine - probably with the toughest set of pistons you can find. I see that they are using a later engine in that PDF, it's an 8-bolt intake manifold for triple carbs, and the fuel pump running on cyl#2, so if I'm not mistaken that's a '66 or later. Can't see if it's an injected motor, but I would expect so. > Think this might raise the combustion temperatures in the chamber and create > more NOx if I recall the chemistry of emissions correctly but you'd reduce > the other polluting emission gasses. >>Start with a oil injected engine, go with a synthetic 2-stroke oil like >>a yamalube - it's a good start. Lots cleaner burning than the original >>oils were 30 years ago. > Check. I still like the smell of a good, old-fashioned 2-stroke oil though. > Actually this might not be true - it's possible we may yet again see a > 2-stroke SAAB coming out of the factory. There is an Australian company > that has developed a new type of two stroke motor that apparently injects > the fuel-air mixture into the cylinder after the piston has passed the > exhaust port. According to their Web site ( www.orbeng.com.au ) SAAB is > participating in testing this new engine. That would be my next car. > I think the fuel delivery system will have a huge impact as well - if we are > looking at the later 850cc motors what carburetor set-up will be most > efficient? I haven't found anything describing the standard equipment on > these motors but I'm assuming some sort of side-draft Weber is an option. The stock engines of that era are a 3-carb setup using Solex carbs. Some of the earlier GT-750 engines could use 2 side-draft carbs, solex I think, but you can't find them, they won't fit an injected block unless you get really creative, and knowing Saab's way of doing things, if it was better than the 3 they would have continued using it. So, I'd say the 3-carb setup is probably it. A (polysync?) to get the carbs synchronized is all it takes - looks intimidating but really isn't. > Am I correct that they never went to fuel injection on the 2 strokes? Fuel? No. Oil injection? Since 1963 on some, '66-ish on all. Last stroker was, I think, '68, which was a few years before fuel injection was started. Dave Hinz

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