We can all learn from this.
03-10-2013, 08:53 AM
#51
TGO Supporter/Moderator
iTrader: (12)
Join Date: Jul 1999
Location: SALEM, NH
Posts: 11,724
Likes: 0
Received 89 Likes
on
75 Posts
Car: '88 Formula, '94 Corvette, '95 Bird
Engine: LC9, 355" LT1, LT1
Transmission: T5, Zf6, 4L60E
Axle/Gears: 3.42, Dana44 3.45, 3.23
Re: We can all learn from this.
Brakes are hydroboost. Only vac lines running out of my intake is for the FPR, Gauge, and BOV.
This system I think is the best combination for a blown motor.
-- Joe
03-21-2013, 12:31 AM
#54
Supreme Member
Re: We can all learn from this.
Yes! Vacuum pump, Exhaust gas evac, PCV, whatever it takes to get crankcase vacuum.
2.
Looking at the picture at the top of the thread I want to say a hard object bounced around quite a bit. Very unlikely to detonate "sort of" on one or two cylinders, unless it was a fuel distribution issue, such as a drop in fuel pressure in the middle of the fuel rail or something that caused uneven air fuel ratios across different cylinders. How does the OTHER side look?
3.
I Believed the reason for the loose second ring is to prevent any pressure from building between the top and second ring- to keep them from squeezing the top of the piston apart. On my roots blown 355 I file fit a traditional set of rings (the $100 federal mogul file fits) to .026 and .028 respectively. Boost was only 10psi max so a stock ring gap probably would have worked as well. (as low at .018"). I think the more important aspect is the piston/wall clearance, the expansion of the aluminum alloy. In other words, good machine work per application. A street car should run a tighter piston wall, a tighter ring gap, in general- because issues like blow-by, oil quality, and cylinder wall wear are dramatically affected by those two factors. (not to mention bearing clearance). And PCV! Even if your valve cover doesnt smoke, you need PCV because all combustion engines produce some blow-by, and getting rid of it quickly helps keep the engine clean.
2.
Looking at the picture at the top of the thread I want to say a hard object bounced around quite a bit. Very unlikely to detonate "sort of" on one or two cylinders, unless it was a fuel distribution issue, such as a drop in fuel pressure in the middle of the fuel rail or something that caused uneven air fuel ratios across different cylinders. How does the OTHER side look?
3.
I Believed the reason for the loose second ring is to prevent any pressure from building between the top and second ring- to keep them from squeezing the top of the piston apart. On my roots blown 355 I file fit a traditional set of rings (the $100 federal mogul file fits) to .026 and .028 respectively. Boost was only 10psi max so a stock ring gap probably would have worked as well. (as low at .018"). I think the more important aspect is the piston/wall clearance, the expansion of the aluminum alloy. In other words, good machine work per application. A street car should run a tighter piston wall, a tighter ring gap, in general- because issues like blow-by, oil quality, and cylinder wall wear are dramatically affected by those two factors. (not to mention bearing clearance). And PCV! Even if your valve cover doesnt smoke, you need PCV because all combustion engines produce some blow-by, and getting rid of it quickly helps keep the engine clean.
Last edited by Kingtal0n; 03-21-2013 at 12:42 AM.
03-21-2013, 11:48 AM
#55
Supreme Member
Thread Starter
iTrader: (2)
Join Date: Sep 2003
Location: Woodland, CA
Posts: 10,494
Likes: 0
Received 3 Likes
on
3 Posts
Car: '02 Z06
Engine: L33 5.7
Transmission: T56
Axle/Gears: Stock IRS
Re: We can all learn from this.
The other side had damage as well which at first I thought it was spark plug chunks but really it seems to have been pieces of piston from that Cylinder #3 explosion. I have been running a hose from each valve cover to a catch can with a breather. This should be sufficient for letting oil gas escape correct?
Thread
Thread Starter
Forum
Replies
Last Post
Gunner242
Electronics
7
12-25-2015 04:49 PM
3.8TransAM
NW Indiana and South Chicago Suburb
1
09-27-2015 08:37 PM
