TSB 11-07-07 Piston Failure
2nd Gear Member
Joined: Mar 2008
Posts: 363
From: California
Don't worry about it these are like 4 cases that gets blown on forums and word of mouth...
5th Gear Member
Joined: Mar 2006
Posts: 2,955
From: ATL
Thread Starter
Mish-ogynist
Joined: Nov 2007
Posts: 3,784
From: Helena, MT
I think we are up to 7 or 8 reported cases, but most of them are 2nd hand info. I think most of the cases are people running 93 octane tunes and someone put 87 in their tanks. BAMA seems pretty confident that their tunes will have 0 issues though.
5th Gear Member
Joined: Jul 2010
Posts: 4,404
From: Texas
A completely stock F150 Coyote? I have yet to hear even a rumor of one blowing #8.
3rd Gear Member
Joined: May 2009
Posts: 879
From: Illinois
There is a report that someone with an FRPP warrantied cai+tuner also had the #8 failure, although i haven't seen a post directly from that person. so take it for what thats worth.
but if that is true that further shows that it could be a defect, and not just what they think the factory engine can handle..
and again, there are people running mid 10's with over 600whp w/o any problems so it's not like the pistons are known as a weak link. the Boss pistons are virtually the same, which is the part that is breaking, i forgot what part about the psiton is different, but it isn't hte part that is breaking.
The 2011+ are vastly superior, this is only an issue experienced by a tiny minority. I had a 2007, the upgrade is huge. with bolt ons you are as fast as a supercharged 2005-2010, a 2011 with f/i it takes a built engine/tranny to keep up, and a big blower.
but if that is true that further shows that it could be a defect, and not just what they think the factory engine can handle..
and again, there are people running mid 10's with over 600whp w/o any problems so it's not like the pistons are known as a weak link. the Boss pistons are virtually the same, which is the part that is breaking, i forgot what part about the psiton is different, but it isn't hte part that is breaking.
The 2011+ are vastly superior, this is only an issue experienced by a tiny minority. I had a 2007, the upgrade is huge. with bolt ons you are as fast as a supercharged 2005-2010, a 2011 with f/i it takes a built engine/tranny to keep up, and a big blower.
From Edmund's first look:
As with the old Boss 302 the decision was made to concentrate on high-rpm power production by optimizing engine respiration. To that end a new set of cylinder heads was developed with CNC-machined ports that allow better breathing at high rpm. More aggressive camshafts were also fitted to take advantage of the increased air flow. The valvetrain components were lightened to better survive those higher engine speeds and new sodium-filled exhaust valves dissipate heat more effectively. New forged aluminum pistons and sinter-forged steel connecting rods were also added to solidify this 302's bottom end.
