Blew head gasket.403 TTi C5
10-06-2010, 08:21 PM
#1
Blew head gasket.403 TTi C5 I got my 9 second pass and on the next run my buddy drove and blew a head gasket.The gasket blew on #3 cylinder,blew the ground strap on #1 and torched the head between cylinders.My boost was 14#s,ARs were 1080-1100,94 octane,meth and a real safe tune.The weekend before the ARs hit 1250 for a split second and I got out of it.We dynoed the next day and everything seemed ok.4 passes later and it blew the gasket.I have ARP studs,LS9 gaskets on an iron block with 317 heads and 95# injectors.Car made 671RWHP.My fuel system is 2 Bosch 44s and the stock fuel system is intact.1 Bosch pump and the stock pump drive the car and the second pump joins in with a Hobbs switch.I know a lot of people don't like 2 pumps but I figured even if one pump went out the other pump and the stock pump should have been enough to hold things together at this power level.We'll be testing the pumps tomorrow and doing a leak down on the other bank.Plugs are TR6 and look fine except for the blown ground strap and #3 was coated grey from coolant.This is no biggie as i have done worse in the past.I just hate putting things back together without finding a problem.
Anyone have any ideas?
Thanks
Anyone have any ideas?
Thanks
10-06-2010, 09:36 PM
#2
I got my 9 second pass and on the next run my buddy drove and blew a head gasket.The gasket blew on #3 cylinder,blew the ground strap on #1 and torched the head between cylinders.My boost was 14#s,ARs were 1080-1100,94 octane,meth and a real safe tune.The weekend before the ARs hit 1250 for a split second and I got out of it.We dynoed the next day and everything seemed ok.4 passes later and it blew the gasket.I have ARP studs,LS9 gaskets on an iron block with 317 heads and 95# injectors.Car made 671RWHP.My fuel system is 2 Bosch 44s and the stock fuel system is intact.1 Bosch pump and the stock pump drive the car and the second pump joins in with a Hobbs switch.I know a lot of people don't like 2 pumps but I figured even if one pump went out the other pump and the stock pump should have been enough to hold things together at this power level.We'll be testing the pumps tomorrow and doing a leak down on the other bank.Plugs are TR6 and look fine except for the blown ground strap and #3 was coated grey from coolant.This is no biggie as i have done worse in the past.I just hate putting things back together without finding a problem.
Anyone have any ideas?
Thanks
Anyone have any ideas?
Thanks
10-08-2010, 07:51 PM
#7
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too bad you where not datalogging it. If the motor leaned out.. and created the problem.. then you would have something to look for.
If the afr was where it needed to be and it blows the HG.. then parts failed and nothing you could do about it.
Modified race cars are to be watched carefully. And you need to work up on the boost/tune-up. Becuase it runs 110% on a dyno doesnt mean it will down the track.
Hopefully its simple stuff and your back up and running in no time. When you can.. start researching dataloggers. There is one called interceptor? that hooks into the OBDII port and has some inputs you can connect transducers for recording fuel and alky pressure.
I've been where your at with a hurt motor and not had the data.. its not a good feeling. I ended up torching 3 HG's over a stupid fuel pump relay that had the contacts burned in it.. intermittantly would drop voltage to fuel pump. I caught it datalogging fuel pressure. FP dropped 5 PSI and I started tearing the whole fuel system apart till I found it. Not saying this is your situation, but it helps to have that "Black Box" when the plane goes down to figure out what happened.
If the afr was where it needed to be and it blows the HG.. then parts failed and nothing you could do about it.
Modified race cars are to be watched carefully. And you need to work up on the boost/tune-up. Becuase it runs 110% on a dyno doesnt mean it will down the track.
Hopefully its simple stuff and your back up and running in no time. When you can.. start researching dataloggers. There is one called interceptor? that hooks into the OBDII port and has some inputs you can connect transducers for recording fuel and alky pressure.
I've been where your at with a hurt motor and not had the data.. its not a good feeling. I ended up torching 3 HG's over a stupid fuel pump relay that had the contacts burned in it.. intermittantly would drop voltage to fuel pump. I caught it datalogging fuel pressure. FP dropped 5 PSI and I started tearing the whole fuel system apart till I found it. Not saying this is your situation, but it helps to have that "Black Box" when the plane goes down to figure out what happened.
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10-09-2010, 10:31 AM
#10
I personally would never run a TR6 in an application like yours. I know others will disagree, but I've seen TR6s cause problems in my own car at these power levels as well as others. I'm not saying that was your issue, but when you put her back together I'd go to at least a 7 heat range, and also get away from the protruded electrode. I run BR7EFs. TR6s knock in my car.
On a side note, your setup sounds fine to me. Might have gone lean for a second and popped, or maybe the plugs gave you an issue. Invest some cash in a better fuel system and get her back together!
On a side note, your setup sounds fine to me. Might have gone lean for a second and popped, or maybe the plugs gave you an issue. Invest some cash in a better fuel system and get her back together!
10-10-2010, 12:13 AM
#11
too bad you where not datalogging it. If the motor leaned out.. and created the problem.. then you would have something to look for.
If the afr was where it needed to be and it blows the HG.. then parts failed and nothing you could do about it.
Modified race cars are to be watched carefully. And you need to work up on the boost/tune-up. Becuase it runs 110% on a dyno doesnt mean it will down the track.
Hopefully its simple stuff and your back up and running in no time. When you can.. start researching dataloggers. There is one called interceptor? that hooks into the OBDII port and has some inputs you can connect transducers for recording fuel and alky pressure.
I've been where your at with a hurt motor and not had the data.. its not a good feeling. I ended up torching 3 HG's over a stupid fuel pump relay that had the contacts burned in it.. intermittantly would drop voltage to fuel pump. I caught it datalogging fuel pressure. FP dropped 5 PSI and I started tearing the whole fuel system apart till I found it. Not saying this is your situation, but it helps to have that "Black Box" when the plane goes down to figure out what happened.
If the afr was where it needed to be and it blows the HG.. then parts failed and nothing you could do about it.
Modified race cars are to be watched carefully. And you need to work up on the boost/tune-up. Becuase it runs 110% on a dyno doesnt mean it will down the track.
Hopefully its simple stuff and your back up and running in no time. When you can.. start researching dataloggers. There is one called interceptor? that hooks into the OBDII port and has some inputs you can connect transducers for recording fuel and alky pressure.
I've been where your at with a hurt motor and not had the data.. its not a good feeling. I ended up torching 3 HG's over a stupid fuel pump relay that had the contacts burned in it.. intermittantly would drop voltage to fuel pump. I caught it datalogging fuel pressure. FP dropped 5 PSI and I started tearing the whole fuel system apart till I found it. Not saying this is your situation, but it helps to have that "Black Box" when the plane goes down to figure out what happened.
Thanks Julio.
I am fairly positive the car leaned out.I wish I had been driving as I always watch my AFs.When you blow electrodes and part of the porcelain on a plug and torch a head it had to have gone lean.I had the head repaired and will be running early next week.As far as dataloging I need to break down and buy the HP Tuners software.We haven't done any tests yet but I am leaning,no pun,towards the fuel pumps.Even though I have lots of fuel I think I would rather have 1 large pump instead of the 2 singles.At least that way if it dies it will shut the motor off.I'll also have to disconnect the stock pump or relay it to shut off under boost when the big pump shuts down.I'm looking at the Aeromotive Pro Series or the Profuel pump.I also like RSIs double pumper but I really want to get away from dual pumps.Ya.Putting something back together without finding the cause is my worst nightmare.Maybe it was that weak Canadian Methylhydrate.
Last edited by 396375; 10-10-2010 at 12:27 AM.
10-10-2010, 12:21 AM
#13
I personally would never run a TR6 in an application like yours. I know others will disagree, but I've seen TR6s cause problems in my own car at these power levels as well as others. I'm not saying that was your issue, but when you put her back together I'd go to at least a 7 heat range, and also get away from the protruded electrode. I run BR7EFs. TR6s knock in my car.
On a side note, your setup sounds fine to me. Might have gone lean for a second and popped, or maybe the plugs gave you an issue. Invest some cash in a better fuel system and get her back together!
On a side note, your setup sounds fine to me. Might have gone lean for a second and popped, or maybe the plugs gave you an issue. Invest some cash in a better fuel system and get her back together!
10-10-2010, 11:35 AM
#14
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get the HP stuff asap.. and get transducers to record pressures.. tie your WB intp it as well.
Doesnt take long for stuff to happen.
