tore into my old motor.....

**zlyricist** · 5-12-08, 18:07

i was planning on swapping a new motor on for this next build......but im pretty lazy and getting a truck and hoist etc is a pain for me. so, i took the head off my gt motor with 210k miles on it. i ran that bitch hard for about 3 months, running 20psi daily on a to4b s trim. the headgasket obviously failed cause i was eating coolant through the exhaust. but the car still dynoed 300whp, and still had no signs of cracked ring lands, or lost compression. so i figured i'd look at it and see if its salvagable

the pistons have a lil bit of dirt and coolant in em from pulling the head off, but they look great in person. my compression is still decent at 120 across, which is good for the mileage and altitude i am at. combustion chamber looked pretty good too, with the exception of cyl #2 where the headgasket failed. you can see it got fairly cooked haha

i cant really tell the exact spot of where the headgasket failed, but the general area is obvious

so reason i post this thread is that i do believe a 300whp, stock f2t motor, daily driver can be done reliably with only a good fuel tune, and somewhat stock timing. i was running pump gas with no control over timing, and a fmu w bleeders for fuel control. this was also done with a zombie chip which has an unknown timing advance in there. i did have to keep my a/f ratio's in the 10s though, otherwise it would knock. i think the headgasket just failed cause it was old, and i was beating on it real good that night

but who knows...

i think im gonna get the head shaved some to make sure it is true, and raise the compression a bit. i hope to put this 210K mile motor back on the road to see some more boost, and 350whp

**chief tool** · 5-12-08, 19:34

you can see the lines of carbon black tracking toward the coolant hole....but the gasket itself doesnt look like there is any signs of burning as such.

My guess is that there was too much pressure in the cylinder for the gasket...it needs to be torqued down more...which migh not be enough, or O-ring the head to help containg the pressure.

**SABBAi** · 5-12-08, 20:03

looks pretty good for the miles and the setup. Obciously not the gasket.

I think if you rebuilt the head and bolted in a new gasket, it'll be fine. Torque, run, then re-torque the head. Use new head studs so they have less chance of stretching.

tx5_brent · 5-12-08, 23:06

Sabbai is so smart lol

5-12-08, 18:07	#1 (permalink)
zlyricist Join Date: May 2004 Location: arvada, CO, USA Age: 23 iTrader: (4)	tore into my old motor..... i was planning on swapping a new motor on for this next build......but im pretty lazy and getting a truck and hoist etc is a pain for me. so, i took the head off my gt motor with 210k miles on it. i ran that bitch hard for about 3 months, running 20psi daily on a to4b s trim. the headgasket obviously failed cause i was eating coolant through the exhaust. but the car still dynoed 300whp, and still had no signs of cracked ring lands, or lost compression. so i figured i'd look at it and see if its salvagable the pistons have a lil bit of dirt and coolant in em from pulling the head off, but they look great in person. my compression is still decent at 120 across, which is good for the mileage and altitude i am at. combustion chamber looked pretty good too, with the exception of cyl #2 where the headgasket failed. you can see it got fairly cooked haha i cant really tell the exact spot of where the headgasket failed, but the general area is obvious so reason i post this thread is that i do believe a 300whp, stock f2t motor, daily driver can be done reliably with only a good fuel tune, and somewhat stock timing. i was running pump gas with no control over timing, and a fmu w bleeders for fuel control. this was also done with a zombie chip which has an unknown timing advance in there. i did have to keep my a/f ratio's in the 10s though, otherwise it would knock. i think the headgasket just failed cause it was old, and i was beating on it real good that night but who knows... i think im gonna get the head shaved some to make sure it is true, and raise the compression a bit. i hope to put this 210K mile motor back on the road to see some more boost, and 350whp
	91 GT hy35 build in the works 06 maxima - the daily

5-12-08, 19:34	#2 (permalink)
chief tool Join Date: Feb 2006 Location: Sydney, Australia Age: 35 iTrader: (1)	you can see the lines of carbon black tracking toward the coolant hole....but the gasket itself doesnt look like there is any signs of burning as such. My guess is that there was too much pressure in the cylinder for the gasket...it needs to be torqued down more...which migh not be enough, or O-ring the head to help containg the pressure.
	84 626 sedan FE SOHC turbo (sleeper) 89 626 5 door F2T 90 323 sedan B6 SOHC Slug-o-matic DD

5-12-08, 20:03	#3 (permalink)
SABBAi Join Date: Apr 2004 Location: Melbourne, Australia iTrader: (1)	looks pretty good for the miles and the setup. Obciously not the gasket. I think if you rebuilt the head and bolted in a new gasket, it'll be fine. Torque, run, then re-torque the head. Use new head studs so they have less chance of stretching.
	Teh Telstar can NEVAH lose!

5-12-08, 23:06	#4 (permalink)
tx5_brent Join Date: Oct 2007 Location: Melbourne, Australia Age: 19 iTrader: (0)	Sabbai is so smart lol