parish8

iTrader: (6)

here is a copy of the post i put in the FI section.

here is my set up.

6.0 with stock heads, head studs, rod bolts, 232/230 595/590 114+1 cam, t76 with air to water intercooler(no ice but a cool night), 111leaded fuel, 13.5psi. open down pipe, about 19deg of timing. i had cometics but couldn't get them to seal up right and ended up with felpro composite gaskets.

friday night i was going to bust a 10.99 or break something or at least turn it up till i saw detonation on efilive. well i poped a head gasket but i did run an 11.43@117

my question is did i just reach the limit of the head gaskets or lift a head or did i get some detonation and that caused it to go bad? my plugs have a green tint, seems like that might be a bad thing. my a/f ratio was right at 12.0-1 till i got into 3rd and then it got up to 12.3 or so. efilive did show some knock retard but it looked to me like the usual false knock i see at times, i didn't hear any audiable detonation.

pic of green plugs http://members.***.net/parish888/DSCN1761.JPG
pic of head gasket http://members.***.net/parish888/DSCN1757.JPG

more pic's of the heads and gaskets and plugs http://members.***.net/parish888/DSCN1745.JPG
http://members.***.net/parish888/DSCN1746.JPG
http://members.***.net/parish888/DSCN1747.JPG
http://members.***.net/parish888/DSCN1748.JPG
http://members.***.net/parish888/DSCN1749.JPG
http://members.***.net/parish888/DSCN1750.JPG
http://members.***.net/parish888/DSCN1751.JPG
http://members.***.net/parish888/DSCN1752.JPG
http://members.***.net/parish888/DSCN1753.JPG
http://members.***.net/parish888/DSCN1754.JPG
http://members.***.net/parish888/DSCN1755.JPG
http://members.***.net/parish888/DSCN1756.JPG
http://members.***.net/parish888/DSCN1758.JPG
http://members.***.net/parish888/DSCN1759.JPG
http://members.***.net/parish888/DSCN1760.JPG
http://members.***.net/parish888/DSCN1761.JPG

soo? what do you all think, i dont really want to just back it off, i want my 10sec 1/4 , i have a set of factrory mls gaskets, should i put them in and try it again and if so what should i do diferently?

blacksheep

iTrader: (1)

The plugs look a little lean to me, but what do I know. Put the mls gaskets on and try for that ten.

NOSjohn

iTrader: (9)

My first impression with the pic of the plugs is that you were running it lean, from the get-go (or close to it), with a combo. of boost and spray.Then as you went down the track the head was lifting, possibly putting anti-freeze and burning it while making the run. I've seen my fair share of popped head gaskets from the Buicks and that gasket looks like it lifted. How early did you spray it? What heat range plugs were you using? With that much boost and spray, I would say 2 if not 3 heat ranges lower.

I would try at least C14 or C16 if you're gonna spray and boost. Way too much cyliner pressure. Also, I would think about having the heads O-ringed with the studs if you're gonna run boost and spray.

parish8

iTrader: (6)

i only spray at the launch, 2400-4300rpm, less than 1 sec.

if the head is lifting is there anything i can do about it? i torqed the studs to arp spec's

Black Blown 02

I say go 1 heat range colder on the plugs, (don't know the NGK part# but I've searched for it on here and found it) Richen it up to 11.7-1 or so, and maybe higher octane. Then up the boost and give it a 100 shot out of the hole.

Black Blown 02

Whats the comeback rpm on the 1-2 shift? If you're not already, Maybe you could spray to just over that point so you get spray in most of first and the start of second gear, for a little extra torque at the shift.

parish8

iTrader: (6)

i have tr6's in there now, that is only one colder than stock, do they make a tr7? what plug would be 2 ranges colder?

my come back on the 1-2 is about 5000rpm, i i am not ready to spray much longer than i am just yet, i might bump it to 4500 or so but that is about it till i get a built motor. 100shot isn't out of the question though.

NOSjohn

iTrader: (9)

Well, now we're getting into motor machine work and I don't own a machine shop. From the numerous Turbo and Nitrous motors I've built, I would O-ring it
and lower your Compression ratio (7.0:1 - 8.5:1 max for big turbos). I believe the stock LQ4 is 9.4:1. You will gain more by going to less compression and using more boost...trust me or call Turbonetics, Gale Banks, Lingenfelter, PT&E, Kenny Duttweiller.

Not many guys will run boost and spray. When a few of us with our Buicks run spray, because so many others are scared, we actually lower the boost a few PSI. The NOS will actually quicken spool, raise boost 2 psi per 100 hit NOS and cool the intake charge 70 degrees...generally.

What spark plugs are those? NGK something...they look a few ranges lower.

EDIT: ok, just read your post, I would go 2 if not 3 heat ranges lower. Yes, they make a TR7 and TR8.

Hit Man X

I just skipped to the end here so...I just thought of something that I've seen before...

Have you considered O-ringing your heads? That could and usually prevents popped gaskets but you run the risk of damaging your pistons as the gasket isn't going to move.

Are you still on stock 6.0 internals? I'll assume you're pushing stock 9.4:1 compression, 12-15psi is a lot + nitrous, but your heads studs should have held that down. But your beginning compression could be the problem...like you're pushing too much for what you got. It could be that only so much can be compressed in each cylinder and it's gotta go somewhere. I don't think you'd have lifted a head at this level, but it's possible...I've seen it happen under hardcore boost...

If you're looking for two steps cooler plugs, sparkplugs.com is NGK's site. They tell you how to order a cooler plug. I ordered a cooler set for my WRX from there, I had to lower one of the number on the part number. Like if it's "CFW35909" for example, you'd want like a "CFW34909" or something like that. You'll see it if you surf around there.

blacksheep

iTrader: (1)

Try an Auto light racing AR472. Only problem is these are too cold to drive on the street. These are the same plugs some nitrous guys use when spraying 250 and up.