The oaf-ish-ul "why ecoboost goes boom" thread
Posted by fiasco
Out of this dumpster fire Professional Moderator Join Date: 08/15/2010 Posts: 1,236 |
John Vanlandingham Elite Moderator Location: Ford Asylum, Sleezattle, WA Join Date: 12/20/2005 Age: Fossilized Posts: 14,152 Rally Car: Saab 96 V4 |
Pete Remner Ultra Moderator Location: Cleveland, Ohio Join Date: 01/11/2006 Age: Midlife Crisis Posts: 2,022 |
That's.... surprising. Either your junkyard motors are expensive or those companies are selling pistons cheap. I wouldn't doubt that the OE pistons, if forged, are forged from a more brittle alloy. The old-school forgings you could hammer into a banana shape without cracking also need more clearance, and besides oil consumption and ringseal problems that creates, people don't want their cute-ute to have loads of piston slap. If they wanted that, they'd have bought a Forester 
It seems to work just fine on the street car level. As a bonus, assembling the engine is REALLY easy, just put the chains on wherever, put the timing cover on, install the damper, and unlock the cam and crank. On the other hand, we've found that Chevy LS engines will loosen the damper when they start to get over 450 or so HP so we pin them all, so maye keyways ain't such a bad idea, at least on the crankshaft. Pete Remner Cleveland, Ohio 1984 RX-7 (rallycross thing) 1978 Silence is golden, but duct tape is silver. |
David Barrett Super Moderator Location: Chicago, IL Join Date: 10/21/2011 Age: Settling Down Posts: 216 |
David Barrett Super Moderator Location: Chicago, IL Join Date: 10/21/2011 Age: Settling Down Posts: 216 |
David Barrett Super Moderator Location: Chicago, IL Join Date: 10/21/2011 Age: Settling Down Posts: 216 |
Out of this dumpster fire Professional Moderator Join Date: 08/15/2010 Posts: 1,236 |
Mark Hille Mod Moderator Location: The hills of CT Join Date: 10/04/2011 Age: Midlife Crisis Posts: 135 Rally Car: I have two crap boxes |
My lima is on the rich side and I've never seen black smoke (ok I totally have but not when things were working right haha. If only that guy had posted that video to youtube.....). Point is, I would double check that you aren't burning oil because that will lower the anti knock ability of your fuel in short order. It may have been catastrophic incidences for both motors but I would be willing to bet the damage may have been somewhat cumulative. I leak down test before and after each rally partly because it only takes 20 minutes on the lima and partly because I wouldn't want to blow my motor during recce. Because you are rebuilding and are going to be a prudent little builder and do leak down to make sure those new rings are sealing, you will have great starting point data to be able to monitor engine condition as races occur. Might be worth to check it every once in a while. Might not be...  Edited 1 time(s). Last edit at 12/09/2016 11:27AM by MarkHille. |
Out of this dumpster fire Professional Moderator Join Date: 08/15/2010 Posts: 1,236 |
Pete Remner Ultra Moderator Location: Cleveland, Ohio Join Date: 01/11/2006 Age: Midlife Crisis Posts: 2,022 |
The last one we worked on before we started pinning them as a matter of course never saw the dragstrip, or even much at all except street tuning. The water pump suffered from infant mortality and when I had the front of the vehicle apart to change it, I noticed the crank bolt had backed out! That bolt is a serious mofo, too. What is it, 120ft-lb plus 240 degrees? It's tighter than my 2131TiMax can manage. I mark the balancer and the bolt and do the belt wrap method to hold the crank, and stick a 6 foot pipe on my breaker bar. Like loosening a Mazda rotary flywheel nut but in reverse  Pete Remner Cleveland, Ohio 1984 RX-7 (rallycross thing) 1978 Silence is golden, but duct tape is silver. |
Pete Remner Ultra Moderator Location: Cleveland, Ohio Join Date: 01/11/2006 Age: Midlife Crisis Posts: 2,022 |
David Barrett Super Moderator Location: Chicago, IL Join Date: 10/21/2011 Age: Settling Down Posts: 216 |
We used to do the same. Put the car up on a lift and hang from a breaker bar to get the factory bolt to break lose. Our badass impact would never get it. |
Mark Hille Mod Moderator Location: The hills of CT Join Date: 10/04/2011 Age: Midlife Crisis Posts: 135 Rally Car: I have two crap boxes |
Pete Remner Ultra Moderator Location: Cleveland, Ohio Join Date: 01/11/2006 Age: Midlife Crisis Posts: 2,022 |
John Vanlandingham Elite Moderator Location: Ford Asylum, Sleezattle, WA Join Date: 12/20/2005 Age: Fossilized Posts: 14,152 Rally Car: Saab 96 V4 |
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