What would cause failure
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+; May 1, 2013 at 10:28 PM.
What plugs?
Did the meth kit actually during the pass where it blew?
Was this on pump gas? Seems like an aweful lot of timing for that setup.
I remember some of us had some questions on the setup during your initial build thread....
Did the meth kit actually during the pass where it blew?
Was this on pump gas? Seems like an aweful lot of timing for that setup.
I remember some of us had some questions on the setup during your initial build thread....
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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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.
Unless he cleaned the chamber....to me it doesnt look like it went lean.
Was one head milled and not known? How are the valve springs? Picture of spark plugs? Picture of tops of all pistons on that side?
Was one head milled and not known? How are the valve springs? Picture of spark plugs? Picture of tops of all pistons on that side?
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...
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.
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.