706 replies to this topic

[MartinS]

[font="arial, helvetica, sans-serif;"][color=#000000;]Building up a list and will try and find someone who can help do them all.[/color][/font]

 

[font="arial, helvetica, sans-serif;"]Check compression, do a leak down test, fit an inline catch tank (proper one suggested by fezzasus that goes back into the engine), and need to find out if[color=#000000;] have a breather from the inlet manifold to the crankcase? possibly the one with the PCV valve in it.[/color][/font]

[font="arial, helvetica, sans-serif;"][color=#000000;]If you do I maybe try disconnecting it from the inlet manifold and running that into a bottle and test.[/color][/font]

 

[font="arial, helvetica, sans-serif;"][color=#000000;]All not within my skill set. [/color][/font]

 

[font="arial, helvetica, sans-serif;"][color=#000000;]Martin S[/color][/font]

ps I checked my gaps on 6 plugs and all good, I ran 7's at the national and car wasnt any better above 7000 revs and had trouble starting. Gone back to 6's.

 

[Steve.i.am]

Hi Martin - maybe misunderstood you but the PCV valve is built into the cylinder head where the inlet gasket is - between the middle 2 cylinders, so not something you can run a pipe from. You just either have it blocked off or not. You need to take the supercharger and inlet manifold off to see.

 

Or, to try & determine if the PCV valve is not blocked off (i.e. in operation) you could run the engine at idle and see if your cam cover breather pipe is sucking in, or blowing out. If it is sucking in, would indicate the PCV is not blocked off and being used.

 

 

[vocky]

It may be as simple as just blocking off the PCV from below the cam cover with some suitable sealant, 20 minutes work. I suspect the PCV valve has failed at high rpm and now just vents all the time.

[leevx2.2]

It may be as simple as just blocking off the PCV from below the cam cover with some suitable sealant, 20 minutes work. I suspect the PCV valve has failed at high rpm and now just vents all the time.

So Martins PCv is open then wouldn't leaving it open and fitting a new valve be the best way foreword ?

[CHILL Gone DUTCH]

It may be as simple as just blocking off the PCV from below the cam cover with some suitable sealant, 20 minutes work. I suspect the PCV valve has failed at high rpm and now just vents all the time.

So Martins PCv is open then wouldn't leaving it open and fitting a new valve be the best way foreword ?

You could do either or But a think replacing the valve will be best because the crank pressure will just go else where ( probably start lifting the dip stick ) Also the chances of the laminovas being clogged is very high so they can be cleaned at the same time But before any of this I would get a compression test done first just to prove Pistons/ rings are good The the only reason I say this is because they could be linked to the power loss lack of power

Edited by CHILL Gone DUTCH, 04 October 2015 - 11:20 AM.

[vocky]

Many SC conversions have the PCV valve blocked up because one type of mapping cannot cope with them being open.

 

Martin's old engine had a blocked off PCV system, the new Saab engine has Dutch software so an open PCV should not be an issue.

 

If the PCV port in the cylinder head is blocked off with some sealant it will hopefully prove whether the PCV system is causing the oil usage, it can easily be removed at a later date and a new PCV valve installed. But for now he needs to locate the problem and then fix it, not throw money at parts in the hope it will cure it

Edited by vocky, 04 October 2015 - 05:09 PM.

[leevx2.2]

well i run a open PCV and am still on Courtenay map all good .

[MartinS]

Compression test done. 220 on all cylinders.

 

Oil consumption seems to have gone up since zandvoort and I very much doubt the new cat is causing it, but, when the cat section was blown apart (as soon as a started using higher revs on the new engine) the backbox also blew a hole and had some repair work done on the final bend (nothing internal).

All has been fine exhaust wise but now there is a distinct loose clanking from within the backbox when you hit the exhaust.

To clear this off the possible list of any back pressure problems, I am taking the exhaust off this week and getting it taken totally apart and checked.

 

Martin

pcv valve work is not within my skills so am putting that off!

 

 

 

[fezzasus]

 

pcv valve work is not within my skills so am putting that off!

 

 

 

 

I would say this is really the area to focus on. Backpressure from a loose exhaust section in the backbox may explain the limit at 7000 rpm, however I would prioritise identifying the oil loss before that.

 

If you are happy taking off the inlet manifold, you will be able to view the PCV. I would recommend replacing with a new part (£8 from the link I provided) Filling with a blob of silicon may do the trick, but I would be concerned about sucking the silicon into the combustion zone if it dislodges.

[MartinS]

Does anyone with a saab engine run with a closed pcv??

 

 

To replace a pcv isn't something I'd be comfortable with as does it not involve removing supercharger, inlet manifold etc etc.

If anyone has a guide I can get a better idea whether this is something I could tackle.

 

Martin S

ps After my exhaust has been taken apart and checked I am then fitting a bog standard oil catch tank as an interim better test rather than the dodgy water bottle and gaffer tape used at Snetterton.

 

[fezzasus]

Chill should be able to walk you through taking the PCV valve out. I assume it's just a pair of needle nose pliers.

[siztenboots]

I suppose that compression test also proves valve stem seals are good. Still, why is there so much blow-by happening is the piston rings are good at static.

[Rosssco]

Chill should be able to walk you through taking the PCV valve out. I assume it's just a pair of needle nose pliers.

 

That's fairly straight forward, I think its the SC and manifold removal that's the challenge for Martin - not a lovely job with the clam on or without draining the chargecooling system..

[MartinS]

Exactly Rossco, never done it before and wary of doing it. Will go to back on track and get it done.

 

Martin

 

[fezzasus]

Martin, i'd ask BoT to borescope it too. I'm concerned that the oil will be contributing a significant amount of deposits on the piston crown.

 

For now, I would recommend having the cam breather venting to atmosphere, rather than pulled into the intake, to try to minimise the amount of deposits formed from burning the oil. Lubricants contribute either 1.5 or 0.8 % ash, so burning 1 L will leave at least 8 g of non-combustible residue. 

[MartinS]

Will do fezzasus, for now though have resolved all my problems by just not driving it, and just sitting at my desk sticking pins in anything with a Saab logo.

 

Martin S

 

[Rosssco]

We can blame the Swedes for Ikea, but its really a GM engine (with help from Lotus Engineering), so consider sticking pins in various things..

[Graeme Lambert]

We can blame the Swedes for Ikea, but its really a GM engine (with help from Lotus Engineering), so consider sticking pins in various things..

Yeah if it was a proper Saab engine it would take 500bhp without doing anything to the internals and last for 250k miles between rebuilds. GM killed Saab. The fuckwits

[Nev]

 

We can blame the Swedes for Ikea, but its really a GM engine (with help from Lotus Engineering), so consider sticking pins in various things..

Yeah if it was a proper Saab engine it would take 500bhp without doing anything to the internals and last for 250k miles between rebuilds. GM killed Saab. The fuckwits

 

 

Yea, you S/C kidz should be ringing up the scrappies and putting B204 engines in for £300. In fact even the T/C kidz should be too. I thought about it originally (6 years ago), but the faff/uncertainty of the form factor change was too much headache.  

Edited by Nev, 06 October 2015 - 06:27 PM.

[Graeme Lambert]

I thought there was a speedster running a maptun'd b234 in Europe? Heavy engines though. Hence their strength