9 second pass was good to get
Blown head gasket.
Thread Starter
Melting Slicks
Joined: Nov 2007
Posts: 2,197
Likes: 2
From: Niagara Falls NY
St. Jude Donor '08-'09
Blown head gasket.
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
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
Burning Brakes
Joined: Apr 2007
Posts: 941
Likes: 12
From: youngsville Louisiana
ken, forgot to mention.... i have two LED lights that signal when the hob switch's for the meth and the second fuel pump are activated. Although this is not fool proof, at least it lets you know at a glance that the pumps have received 12 volts. I mounted them on the gauge pillar near the boost/afr gauges. Best of luck bro!
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Tech Contributor
Joined: Apr 2007
Posts: 10,924
Likes: 78
From: Forney Texas
your cylinder should have signature markings on the combustion chambers and pistons if it was caused by detonation. It might look like micro craters from aluminum spatter. Looking for spots on the other plugs with a good jewelers loop is a good idea too. You often won't see it without good magnification.
Thread Starter
Melting Slicks
Joined: Nov 2007
Posts: 2,197
Likes: 2
From: Niagara Falls NY
St. Jude Donor '08-'09
your cylinder should have signature markings on the combustion chambers and pistons if it was caused by detonation. It might look like micro craters from aluminum spatter. Looking for spots on the other plugs with a good jewelers loop is a good idea too. You often won't see it without good magnification.