govich Posted June 15, 2017 Report Share Posted June 15, 2017 I winced when I read you'd blanked up the port at the charger intake. On 6/12/2017 at 13:19, Tazman861 said: I'm just trying to understand what went wrong The intake manifold is pressurised by the charger so as soon there's any boost, the PCV would shut (doing its job) & blowby inside the engine would pressurise the now closed crankcase -> split dipstick cap. At least it was that & not one of the crank seals that went. avalaugh 1 Quote Link to comment Share on other sites More sharing options...
avalaugh Posted June 15, 2017 Author Report Share Posted June 15, 2017 I winced when I read you'd blanked up the port at the charger intake. On 6/12/2017 at 13:19, Tazman861 said: I'm just trying to understand what went wrong The intake manifold is pressurised by the charger so as soon there's any boost, the PCV would shut (doing its job) & blowby inside the engine would pressurise the now closed crankcase -> split dipstick cap. At least it was that & not one of the crank seals that went. Christ I didn't think of that, so lucky really. All sorted now and running like a champ again. Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
Tazman861 Posted June 15, 2017 Report Share Posted June 15, 2017 Now I'm confused? If the crankcase is pressurised from the inlet side surely that means the positive pressure is pushing past the rings? Wouldn't that be a drop in performance as there wouldn't be much compression? Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
govich Posted June 15, 2017 Report Share Posted June 15, 2017 18 minutes ago, Tazman861 said: Now I'm confused? If the crankcase is pressurised from the inlet side surely that means the positive pressure is pushing past the rings? Wouldn't that be a drop in performance as there wouldn't be much compression? Sent from my iPhone using Tapatalk A bit of blowby is normal because it's an imperfect metal to metal seal, you're right it causes a drop in compression but very small depending on how worn the engine is. In this case with a supercharger the cylinder pressures are higher than the piston ring pack was designed for so there's even more than usual, but the net result is still a lot more power. When the PCV closes, the oil side of the engine becomes almost pressure tight, so both the increased blowby and just the movement of the pistons causes spikes which the oil seals are sensitive to & eventually something gives. Quote Link to comment Share on other sites More sharing options...
Tazman861 Posted June 15, 2017 Report Share Posted June 15, 2017 Ok so I understand that but how does a catch can make such a difference? If there is,say, a 5 psi pressure increase where does that go? Won't it pressurise the catch can? Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
govich Posted June 16, 2017 Report Share Posted June 16, 2017 7 hours ago, Tazman861 said: Ok so I understand that but how does a catch can make such a difference? If there is,say, a 5 psi pressure increase where does that go? Won't it pressurise the catch can? Sent from my iPhone using Tapatalk The CCV system is designed to maintain a certain working pressure and to filter out oil, it's efficient at this within a band of flow rates which BMW calculates/measures for the engine. Usually that's a very slight vacuum, for various reasons. With more flow (blowby on a supercharged engine), the CCV becomes less efficient - it can't separate all the oil out since there's more mixture going through than it was designed for, but it's still ok for maintaining the working vacuum. The idea of the catch can is to separate more of the oil out of the flow coming from the engine, but it has to be done without affecting the vacuum. When you fill the catch can with holes and steel wool and tortuous paths, it becomes very good at separating oil but also a pressure restriction, and since the vacuum source is after the catch can it can't maintain the same level of vacuum in the engine. Then you have a similar situation to the closed PCV; mixture can't get through the ventilation system & the engine starts pressurising and pumping oil out. Without knowing what level of vacuum the engine is designed for & how much pressure is lost across your catch can, you're taking a bit of a stab in the dark which is why I was nervous about creating my own system & went for the M56 valve cover. Quote Link to comment Share on other sites More sharing options...
avalaugh Posted June 16, 2017 Author Report Share Posted June 16, 2017 I've had the 1st stage of my mapping done now by George Galshvili, he also suggested that I vent to atmosphere when running boost. The M56 valve cover is probably the best option, but again on high boost applications I think it too will be I overwhelmed. Sent from my iPhone using Tapatalk govich 1 Quote Link to comment Share on other sites More sharing options...
govich Posted June 16, 2017 Report Share Posted June 16, 2017 Completely agree Paul, the best thing about the m56 cover is I can replace the diaphragm when it wears & no cold weather concerns but it's still not ideal with the charger, just a lot better How does it feel with the mapping? Did you manage to get the tune off with the ESS software or something else? Quote Link to comment Share on other sites More sharing options...
Tazman861 Posted June 16, 2017 Report Share Posted June 16, 2017 So what do the various supercharger suppliers do? How do they deal with the pressurised crankcase ? Or even the turbo users? I can't believe this problem has just surfaced?? Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
govich Posted June 16, 2017 Report Share Posted June 16, 2017 With a supercharger or turbocharger you take the vacuum from before the charger rather than from the intake manifold & that works Quote Link to comment Share on other sites More sharing options...
avalaugh Posted June 22, 2017 Author Report Share Posted June 22, 2017 Been gathering parts ready for the 6 speed transmission swap. New Guibo and centre prop bearing. New 6 speed Clubsport gear knob New bushes and nylon washers Gearbox has been cleaned and filled with new oil Lightweight flywheel from TTV Racing Dual friction clutch kit arriving tomorrow from CG Motorsport So should be a fun filled Friday night [emoji108][emoji106] Sent from my iPhone using Tapatalk RMJ and R11CH 2 Quote Link to comment Share on other sites More sharing options...
Laurent Posted July 5, 2017 Report Share Posted July 5, 2017 Only issue now is I think I can hear the vanos rattle Sent from my iPhone using Tapatalk ____________________________________________________________________________ Autoclave dentaire | Caméra Intra-orale Quote Link to comment Share on other sites More sharing options...
RMJ Posted July 5, 2017 Report Share Posted July 5, 2017 Excellent update for the 6 speed swap! Interested to see how you get on with the TTV flywheel and the CG clutch, did CG not offer a solidflywheel that was suitable? Ive always been wary of their products from the interesting reviews that they get. Quote Link to comment Share on other sites More sharing options...
avalaugh Posted July 5, 2017 Author Report Share Posted July 5, 2017 Excellent update for the 6 speed swap! Interested to see how you get on with the TTV flywheel and the CG clutch, did CG not offer a solidflywheel that was suitable? Ive always been wary of their products from the interesting reviews that they get. The flywheel is great [emoji106] CG don't do a sprung clutch plate for the 6 speed, looked everywhere but couldn't find one. So It's going to be interesting tomorrow at Snetterton, will see if the vibrations drive me mad. Sent from my iPhone using Tapatalk RMJ 1 Quote Link to comment Share on other sites More sharing options...
RMJ Posted July 7, 2017 Report Share Posted July 7, 2017 On 05/07/2017 at 22:15, avalaugh said: The flywheel is great [emoji106] CG don't do a sprung clutch plate for the 6 speed, looked everywhere but couldn't find one. So It's going to be interesting tomorrow at Snetterton, will see if the vibrations drive me mad. Sent from my iPhone using Tapatalk How was it mate? good day out? go mad?, I don't find the vibrations too bad at all. Pros certainly outweigh the cons in my opinion Quote Link to comment Share on other sites More sharing options...
avalaugh Posted July 7, 2017 Author Report Share Posted July 7, 2017 I found the cause of the vibrations to be from the duraflex gearbox mounts I had installed at the same time, swapped them out for the stock ones and all vibrations have practically gone [emoji106] Didn't go too well at Snetterton, had a bit of an issue as kept filling the oil catch can, then had a blow out at over 100mph [emoji15] So that put an end to the evening for me. To be fair the P-Zero's have done me proud but think I have pushed them too hard as sidewalls were just folding on me. They then caught the HSD coilovers adjustable ARB bracket and ripped that all off too Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
TriggerFish Posted July 8, 2017 Report Share Posted July 8, 2017 Interesting read this, not that I understand lots of it! I destroyed a tyre with the HSD droplink bracket too If you've still got the gearbox out, it's probably worth replacing number 12 (no idea if this is the right one for your car, I just wanted a reference diagram) as that what's causes most of the play in the gear lever. http://www.realoem.com/bmw/enUS/showparts?id=AM11-EUR-10-1997-E46-BMW-320i&diagId=25_0375 Rob - I had a CG clutch in my last 330d - it didn't cause me any problems, but did judder a bit at low revs. Not sure what they'd be like with proper power going through them though, rather than just a remapped 184 330d. Quote Link to comment Share on other sites More sharing options...
avalaugh Posted July 9, 2017 Author Report Share Posted July 9, 2017 No slop In my gear linkage thankfully, I replaced 2,7,10, that's actually the diagram for a 5 speed, the 6 is quite different. Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
avalaugh Posted July 16, 2017 Author Report Share Posted July 16, 2017 So finally taken the plunge on some track focused rubber, gone with YOKOHAMA AD08R's, had a go in my mates Renault Megane R26 at Snetterton, he had these fitted and the grip levels were immense. Also ordered a set of BIMECC wheel spacers, 12mm front and 15mm rears. Should see it sitting rather menacingly [emoji106] Sent from my iPhone using Tapatalk R11CH and RMJ 2 Quote Link to comment Share on other sites More sharing options...
avalaugh Posted July 21, 2017 Author Report Share Posted July 21, 2017 In for wheel alignment, again..... I've really got to stop changing things [emoji12] Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
avalaugh Posted July 25, 2017 Author Report Share Posted July 25, 2017 Here kitty kitty, come meet my grinder Sent from my iPhone using Tapatalk RMJ 1 Quote Link to comment Share on other sites More sharing options...
R11CH Posted July 25, 2017 Report Share Posted July 25, 2017 Decided to fully decat it then. Hope you don't end up with a horrible rasp gutting the cats. Quote Link to comment Share on other sites More sharing options...
avalaugh Posted July 25, 2017 Author Report Share Posted July 25, 2017 Oddly that's kinda what I want, I love a raspy exhaust note. Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
R11CH Posted July 26, 2017 Report Share Posted July 26, 2017 (edited) I like a rasp like the M3 rasp but i have heard a horrible tinny rattling rasp with gutted cats as it resonates around the empty box. I bought all the pipe work and pre made 45 degree bends to mate upto the m52 manifold and downpipes to completely remove the lot on mine just no time to fit it all. Get a video up of it when you done it. I liked the over run on yours few pops and bangs. Edited July 26, 2017 by R11CH Quote Link to comment Share on other sites More sharing options...
avalaugh Posted July 26, 2017 Author Report Share Posted July 26, 2017 Will do mate, still got the stock silencers so should be bad with just cats removed [emoji106] Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...