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Re: diy vs engineered well i haven't increased the screen size
Posted by neil dale [Email] (#2111) [Profile/Gallery] (more from neil dale) on Wed, 8 Nov 2017 20:19:53

In Reply to: Re: diy vs engineered well i haven't increased the screen size, Snowmobile [Profile/Gallery] , Wed, 8 Nov 2017 17:17:40
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yes, indeedy the hole size (as is everything,) designed "for a reason " but the question is what was the reason and is it still or was it ever valid! so far in reading the article about oil, pistons, oil pickups I need to disagree w/ the learned Mr Andrews . in an engineering forum I found this comment which reflects my experience" The consensus long years ago was the skirt stabilized the piston in the manner described, spring effect, even to the point of adding an additional ring to the bottom of the skirt. It would appear by looking at the set of JE pistons I installed a couple weeks ago that that theory is of no, or at least limited value in today's pistons. They had almost no skirt below the pin boss. In test run-ups of the engine (dyno is not scheduled yet), I have significantly less blowby and leak down than with the previous Hepolite/Mahle design long skirt pistons. JE uses a 'hypereutectic' (sp) alloy that is installed with 0.0015" clearance at the skirt. Kinda tight for me but, it's working. I personally have seen a rather radical change in the pistons I have used in the last 20 years (Venolia, JE, AE, Omega, Hepolite, Mahle, TRW, Cosworth$, Jahns, etc., both forged and various cast methods) in high-performance engines. I like what is happening as they seem to be a much better product as far as I am concerned " an interesting discussion on Saab net.com I've been reading and a reference. link to an old issue of "Nines " ( the USA Saab club magazine ) http://www.saabspokane.com/downloads/NINES%20279%2016-17.pdf the Author, a renowned former Saab shop owner, said the old (ER ) 9000 oil pump had a higher "overcapacity " ? is that volume? pressure ? and how much different than the OG 9-3, 9-5 ? also it is stated the oil thermostat opened earlier at 221 F instead of the later 265 deg F It is posited (believed, speculated) that that may be a factor in oil sludging and premature turbo failure as the oil in the turbo is not sufficiently cooled prior to engine shut down ! I find it fascinating how much can be learned by re-reading older Saab articles and I am especially excited as I have wanted to improve the oil system and oil cooling for some time now ! in my conception I envisioned, brainstormed an extra oil cooler, extra oil capacity, a better or electric boost pump, added external oil filters etc ironically this is all pretty much the same stuff we did to our vehicles and old English motorcycles years ago ! regards

->Posting last edited on Wed, 8 Nov 2017 21:34:51.

_______________________________________ viggen02


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