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19/08/2003 19:32:15   Stewart   Hi I've just bought a red V4 96 to play with. My first Saab. The car is in competition trim and has a 32 36 Weber carb. The car was once owned by a guy called Bruce Pritchard in London.Anybody remember seeing it around? any history would be good? YGC 49G. The engine had some mods including cam and was reputed to be putting out some poke in the past but it doesn't now seem to be delivering what feels as though it ought to be there. I intend working my way through checking etc but is there anything particular to V4s that might have been "left undone" or need doing
It also sometimes seems to be running hot and vapourises fuel after stopping on long journey. Is this typical?
I live in Northumberland and any info on garages in NE/S Scotland specialising in working on such Saabs would be welcome.
Stewart
 
21/08/2003 12:53:26   Richard   First I would give the car a good service. Then check the ignition is set right, ask the previous owner what he set it at ( somewhere between 6 - 9deg on a single carb, but depends on cam and dizzy mods). Change the plus and HT cables if the car has been stood, see if you are getting a good spark (note plugs may not be std saab, could be next heat zone up). Then check that the carb is functioning Ok, you may want to clean the jets and float camber. If this makes no difference you may wish to have the compression checked at a garage.
The fuel vapourisation is probably being caused by the engine running hot. Back flush the rad etc to clear any sediment, usually a rally car would need more cooling so a larger rad is fitted or a re-cored high efficiency rad is fitted with and electric fan. Next take out the thermostate (if it has one in), this would need to be the 83deg version, preferable with the 3mm bleed holes drilled in it. Check this opens fully in a pan on the cooker with a thermometer in it. If after a hard run large quantities of water are being blown out the cylinder head gasket is most likley on its way. The vapourisation may go once you have addressed the cooling system, if not a spacer and a longer operating shaft can be fitted if running a mechanical pump to provide a heat barrier. Failing that fit an electric pump (fit two if ralling so you have a back up)and heat insulate the pipe work (including the pipe inside the car).
Oh the other thing is to get out and use it, you have some good events up their talk to Colin Walace of SOC he will tell you about the different types of rallies you can do, from non-damaging tours, historic road rallies, sprinting and stage events, dont become one of the many rally car polishers, its a waste of car.  
21/08/2003 12:53:30   Richard   First I would give the car a good service. Then check the ignition is set right, ask the previous owner what he set it at ( somewhere between 6 - 9deg on a single carb, but depends on cam and dizzy mods). Change the plus and HT cables if the car has been stood, see if you are getting a good spark (note plugs may not be std saab, could be next heat zone up). Then check that the carb is functioning Ok, you may want to clean the jets and float camber. If this makes no difference you may wish to have the compression checked at a garage.
The fuel vapourisation is probably being caused by the engine running hot. Back flush the rad etc to clear any sediment, usually a rally car would need more cooling so a larger rad is fitted or a re-cored high efficiency rad is fitted with and electric fan. Next take out the thermostate (if it has one in), this would need to be the 83deg version, preferable with the 3mm bleed holes drilled in it. Check this opens fully in a pan on the cooker with a thermometer in it. If after a hard run large quantities of water are being blown out the cylinder head gasket is most likley on its way. The vapourisation may go once you have addressed the cooling system, if not a spacer and a longer operating shaft can be fitted if running a mechanical pump to provide a heat barrier. Failing that fit an electric pump (fit two if ralling so you have a back up)and heat insulate the pipe work (including the pipe inside the car).
Oh the other thing is to get out and use it, you have some good events up their talk to Colin Walace of SOC he will tell you about the different types of rallies you can do, from non-damaging tours, historic road rallies, sprinting and stage events, dont become one of the many rally car polishers, its a waste of car.  
21/08/2003 16:43:51   Richard   Ok forgot to mention this one. The rockers can wear on the shaft causing sideways movement that will mess up the valve openings. You can usually feel this by moving the rocker sideways when unloaded. A similar problem can exist if the cam has worn, but this would need a strip down to find out.  
22/08/2003 17:12:15   Alistair   Not a lot to add to Richard's advice, except I'd check that the dissie is holding vaccuum to maintain the advance - assuming it's on conventional ignition. I've had a few that have swung around & gradually lost the advance causing it to feel as flat as a fart (no more comments on this topic - see previous discussion please!).

Not sure of the cause, I just swapped the dissies.

Also, if it has a carb that has been previously fitted to another car & just bolted on to your V4, the jets may be all wrong. Some people just think you can grab a twin choke Weber off an XR2 or whatever & away you go. Doesn't quite work like that!  
22/08/2003 17:14:45   Alistair   And another thing... what exhaust do you have fitted? If it's a standard system then the engine will be really strangled. Dump asap & fit a bigger bore system!  
23/08/2003 08:42:44   john wyatt   Stewart my 96 is quite heavily modded engine wise and has had a recent tune the tuner thought output was probably 110bhp, a friend,,has a 96 with same carb set up free flow exhaust and mildy ported heads I would guess his is about 80bhp,it would maybe be worth getting your car on a rolling road. I am south of Edinburgh you would be welcome to try mine out and get a comparison if you are ever up this way, also if you need any spares I know of a "breaker" locally who is very reasonable  


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