What would cause failure
05-01-2013, 12:31 PM
#1
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What would cause failure Hey guys I purchased a built 390 long block forged crank rods and pistons made about 7 passes and engine got hurt, cylinders 1-3-5-7 all had damage holes in valves and the ends of spark plug holes melted so as of now I have to replace 1 head and 3-4 pistons trying to narrow the problem down.
Here's breakdown
390 ci Callie's dragonslayer crank compstar rods diamond racing pistons
F1a pro charger 3.90 pulley aster bracket 8 rib and front mount inner cooler
317 heads with 1/2 head studs 9.5-1 cr
Fuel set up is as follows
100lb inj. -8an feed and return lines boost referenced regulator 2 intank fuel pumps with Hobbs switch.
Also has snow stage 2 meth kit.
Tuning with hptuners and 2 bar sd set up
I'm not sure what final timing was but was between 18-20*
a/f ratio was set for 11.74.
So why would only half the engine have issue and other be fine
Bad injectors maybe? I'll post pics later.
cyl #1
cyl #7
cyl #7
Here's breakdown
390 ci Callie's dragonslayer crank compstar rods diamond racing pistons
F1a pro charger 3.90 pulley aster bracket 8 rib and front mount inner cooler
317 heads with 1/2 head studs 9.5-1 cr
Fuel set up is as follows
100lb inj. -8an feed and return lines boost referenced regulator 2 intank fuel pumps with Hobbs switch.
Also has snow stage 2 meth kit.
Tuning with hptuners and 2 bar sd set up
I'm not sure what final timing was but was between 18-20*
a/f ratio was set for 11.74.
So why would only half the engine have issue and other be fine
Bad injectors maybe? I'll post pics later.
cyl #1
cyl #7
cyl #7
Last edited by +badss+; 05-01-2013 at 10:28 PM.
05-01-2013, 04:24 PM
#5
TECH Resident
Maybe a bit too much timing, maybe a little too lean, but I'm thinking possibly too low coolant, or a restricted coolant flow on that side? Just speculating and throwing ideas out.
05-01-2013, 06:42 PM
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Plugs were ngk bref7's,
Was running 93 pump with snows boost juice mix
Making 16 lbs of boost.
As for holes I meant an actual hole in the valves ill load the pics up once I get home from work tonight.
As for cooling I have stock radiator no ac using 16" and 9" fans and a brand new ls2 water pump with *160 t-stat.
Heads are stock 317's
Reason why I'm asking is because people are telling me its a tune issue so I'm just trying to figure out what needs to be done
I was told car made 650rw on dyno but what I ran at the track and the cars weight puts it more in the 725-750 range.
Was running 93 pump with snows boost juice mix
Making 16 lbs of boost.
As for holes I meant an actual hole in the valves ill load the pics up once I get home from work tonight.
As for cooling I have stock radiator no ac using 16" and 9" fans and a brand new ls2 water pump with *160 t-stat.
Heads are stock 317's
Reason why I'm asking is because people are telling me its a tune issue so I'm just trying to figure out what needs to be done
I was told car made 650rw on dyno but what I ran at the track and the cars weight puts it more in the 725-750 range.
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05-02-2013, 06:36 AM
#13
Plugs were ngk bref7's,
Was running 93 pump with snows boost juice mix
Making 16 lbs of boost.
As for holes I meant an actual hole in the valves ill load the pics up once I get home from work tonight.
As for cooling I have stock radiator no ac using 16" and 9" fans and a brand new ls2 water pump with *160 t-stat.
Heads are stock 317's
Reason why I'm asking is because people are telling me its a tune issue so I'm just trying to figure out what needs to be done
I was told car made 650rw on dyno but what I ran at the track and the cars weight puts it more in the 725-750 range.
Was running 93 pump with snows boost juice mix
Making 16 lbs of boost.
As for holes I meant an actual hole in the valves ill load the pics up once I get home from work tonight.
As for cooling I have stock radiator no ac using 16" and 9" fans and a brand new ls2 water pump with *160 t-stat.
Heads are stock 317's
Reason why I'm asking is because people are telling me its a tune issue so I'm just trying to figure out what needs to be done
I was told car made 650rw on dyno but what I ran at the track and the cars weight puts it more in the 725-750 range.
05-02-2013, 08:12 AM
#17
What Skinny said^^^
What do the 2468 plugs look like?
As mentioned, 11.7 at that kind of boost = ??
Also, at 16#, a 2 bar MAP is outta resolution.
As mentioned, it looks mechanical. To confirm, look at the other side.
Take a look at exh valve seat contact. W/ that AFR and boost, the valves better be doing a good job of heat transfer...
What do the 2468 plugs look like?
As mentioned, 11.7 at that kind of boost = ??
Also, at 16#, a 2 bar MAP is outta resolution.
As mentioned, it looks mechanical. To confirm, look at the other side.
Take a look at exh valve seat contact. W/ that AFR and boost, the valves better be doing a good job of heat transfer...
05-02-2013, 08:18 AM
#18
I'm not sure what final timing was but was between 18-20*
a/f ratio was set for 11.74.
That is with the meth or without the meth? 11.7 with meth would be ok if the meth didnt stop working. I also see that your are spraying your meth before the AIT sensor.. is that 18-20 with the meth? I think the problem is too much timing and the car out of the map.
a/f ratio was set for 11.74.
That is with the meth or without the meth? 11.7 with meth would be ok if the meth didnt stop working. I also see that your are spraying your meth before the AIT sensor.. is that 18-20 with the meth? I think the problem is too much timing and the car out of the map.
05-02-2013, 09:32 AM
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I'm not sure what final timing was but was between 18-20*
a/f ratio was set for 11.74.
That is with the meth or without the meth? 11.7 with meth would be ok if the meth didnt stop working. I also see that your are spraying your meth before the AIT sensor.. is that 18-20 with the meth? I think the problem is too much timing and the car out of the map.
a/f ratio was set for 11.74.
That is with the meth or without the meth? 11.7 with meth would be ok if the meth didnt stop working. I also see that your are spraying your meth before the AIT sensor.. is that 18-20 with the meth? I think the problem is too much timing and the car out of the map.