Pushing water....
This car should not be having issues with pushing coolant while running on 93 oct w/ the compression numbers that you are giving. It should not have a knocking problem either. Is this car a 98'? Are you hearing the detonation or just seeing it in a log. 98 knock sensors are useless. You will get lots of false knock. Do you have breathers or a closed pcv system. If it's closed, you could be sucking oil thru the intake and getting real knock. The amount of timing that you are running shouldnt be a problem either. As far as torque on the heads. I have read that the heads with cometics gaskets and arp studs should be torqued to 80 ft/lbs and retorqued after they go thru a heat cycle. Were both the head and the short block surfaces checked? The cometics gasket is very sensitive to imperfections on the mating surfaces. If all that checks out, throw a couple of GM coolant seal tabs in the radiator. Your fuel octane is not the problem but you can try to see if putting a higher octane fuel and if the knock is still present then it is likely false. good luck.
Oh, and +1 on the dedicated fuel cell for the nitrous. It's just better than pulling fuel off the rail + it allows the use of high octane fuel on demand.
Oh, and +1 on the dedicated fuel cell for the nitrous. It's just better than pulling fuel off the rail + it allows the use of high octane fuel on demand.
Thread Starter
That's what she said...
iTrader: (8)
Joined: Mar 2004
Posts: 7,954
Likes: 2
From: Nederland Texas
The car is a 98, but I updated the knock sensors/harness. The knock was VERY audible on the last run, not just on the logger.
I don't have any kind of PCV on the car, just a vent on the valve cover leading to a breather. I did notice (for some reason) there was oil in the intake after 4k miles, quite a bit actually. I don't know where it's coming from or how it got there. The only way would have to be some kind of reversion in the ports or something and somehow blowing oil back into the manifold, but that would mean the valve seals would have to be worn out and they're brand new. The cam has 20* overlap.
The longblock was assembled by LME, all the machine work was done by them also. I can't vouch for how true everything is but I'm sure it was probably fine upon assembly.
I don't have any kind of PCV on the car, just a vent on the valve cover leading to a breather. I did notice (for some reason) there was oil in the intake after 4k miles, quite a bit actually. I don't know where it's coming from or how it got there. The only way would have to be some kind of reversion in the ports or something and somehow blowing oil back into the manifold, but that would mean the valve seals would have to be worn out and they're brand new. The cam has 20* overlap.
The longblock was assembled by LME, all the machine work was done by them also. I can't vouch for how true everything is but I'm sure it was probably fine upon assembly.
That's the exact reason we did the dedicated fuel sysytem from the existing tank, over the stand alone fuel system; I am not going to be running some watered down fuel through my many $$ motor, a recipe for disaster in the waiting. If it was mine I would run race gas in the main tank also. That's just me, as I know plenty of guys use the watered down method...
Hey, where's that write up?
Robert
Hey, where's that write up?
Robert
I did some quick calculations. On a 150 shot with 93 in the tank and 116 in the standalone, my overall octane rating would be about 98.5. On a 200 shot it would be about 99.5. Is that problem? Is mixing leaded + unleaded a problem? I'm not running any O2's besides my wideband, plus I wouldn't be running enough leaded fuel to make a **** anyway.
I had no idea that the standalone tank would last so long as you guys are saying lol. 11.5:1 air/fuel by weight means I'd burn up a lot of spray before that fuel ran low, never thought about it before.
PS - I couldn't find much info on gapping TR-7 plugs either. .032" or so sound about right?
I had no idea that the standalone tank would last so long as you guys are saying lol. 11.5:1 air/fuel by weight means I'd burn up a lot of spray before that fuel ran low, never thought about it before.
PS - I couldn't find much info on gapping TR-7 plugs either. .032" or so sound about right?
The car is a 98, but I updated the knock sensors/harness. The knock was VERY audible on the last run, not just on the logger.
I don't have any kind of PCV on the car, just a vent on the valve cover leading to a breather. I did notice (for some reason) there was oil in the intake after 4k miles, quite a bit actually. I don't know where it's coming from or how it got there. The only way would have to be some kind of reversion in the ports or something and somehow blowing oil back into the manifold, but that would mean the valve seals would have to be worn out and they're brand new. The cam has 20* overlap.
The longblock was assembled by LME, all the machine work was done by them also. I can't vouch for how true everything is but I'm sure it was probably fine upon assembly.
I don't have any kind of PCV on the car, just a vent on the valve cover leading to a breather. I did notice (for some reason) there was oil in the intake after 4k miles, quite a bit actually. I don't know where it's coming from or how it got there. The only way would have to be some kind of reversion in the ports or something and somehow blowing oil back into the manifold, but that would mean the valve seals would have to be worn out and they're brand new. The cam has 20* overlap.
The longblock was assembled by LME, all the machine work was done by them also. I can't vouch for how true everything is but I'm sure it was probably fine upon assembly.
Robert
Thread Starter
That's what she said...
iTrader: (8)
Joined: Mar 2004
Posts: 7,954
Likes: 2
From: Nederland Texas
The writeup is on my GF's laptop, I keeps forgetting to email it. 
I would love to run race gas constantly in the car, but it's just not in the budget right now. I don't work while I go to school, only co-ops, and that's only sometimes. I have to save my dough up when I'm working then ration it. I haven't "worked" since August '07. I've got a gas/food card, but I don't think it would be wise of me to be puttin' 55-gallon drums of 116 on it.
I have not looked down in the ports very hard, but if I pull the heads, I'll definitely be able to tell how much is in there. I'm going to try it out this weekend and see if it is actually pushing water. If it is, I'll tear it down over spring break.
I would love to run race gas constantly in the car, but it's just not in the budget right now. I don't work while I go to school, only co-ops, and that's only sometimes. I have to save my dough up when I'm working then ration it. I haven't "worked" since August '07. I've got a gas/food card, but I don't think it would be wise of me to be puttin' 55-gallon drums of 116 on it.
I have not looked down in the ports very hard, but if I pull the heads, I'll definitely be able to tell how much is in there. I'm going to try it out this weekend and see if it is actually pushing water. If it is, I'll tear it down over spring break.
As far as breathers go. How many do you have? Sounds like you only have one which is not usually enough. I have a small one in the back on the drivers side and a big one on the filler neck. I also have the nipple tube one that normally hooks to the top of the TB hooked to the valley cover with a breather inbetween.
Do you have an AFR gage in the car? Could be leaning out or getting too rich.
Race gas is a band aid for this problem. You need to get to the cause of it.
Do you have an AFR gage in the car? Could be leaning out or getting too rich.
Race gas is a band aid for this problem. You need to get to the cause of it.
Thread Starter
That's what she said...
iTrader: (8)
Joined: Mar 2004
Posts: 7,954
Likes: 2
From: Nederland Texas
Ok got some updates.
I put in the TR7's, kicked the timing back to 20*, and put the 50 pills in it.
It has random KR sometimes on MOTOR, so I'm calling that false knock. It knocks a bit on nitrous too, but after the damn window cuts it off lol, so I'm calling that false too. Doesn't matter if it's on motor/spray, it shows about the same amount of false knock. I can't HEAR any knock either.
I then ran it 5-6 little short 2-3 gear blasts on nitrous with the 100 pills back in over about 10-15 minutes and it the coke bottle was full of coolant. At idle I could see some small bubbles coming out of the hose, not sure if it's steam or combustion gases.
I let it sit overnight and it sucked it all back in. Does this mean that it's actually pushing water or it's just warming up and puking a bit out?
I put in the TR7's, kicked the timing back to 20*, and put the 50 pills in it.
It has random KR sometimes on MOTOR, so I'm calling that false knock. It knocks a bit on nitrous too, but after the damn window cuts it off lol, so I'm calling that false too. Doesn't matter if it's on motor/spray, it shows about the same amount of false knock. I can't HEAR any knock either.
I then ran it 5-6 little short 2-3 gear blasts on nitrous with the 100 pills back in over about 10-15 minutes and it the coke bottle was full of coolant. At idle I could see some small bubbles coming out of the hose, not sure if it's steam or combustion gases.
I let it sit overnight and it sucked it all back in. Does this mean that it's actually pushing water or it's just warming up and puking a bit out?
Ok got some updates.
I put in the TR7's, kicked the timing back to 20*, and put the 50 pills in it.
It has random KR sometimes on MOTOR, so I'm calling that false knock. It knocks a bit on nitrous too, but after the damn window cuts it off lol, so I'm calling that false too. Doesn't matter if it's on motor/spray, it shows about the same amount of false knock. I can't HEAR any knock either.
I then ran it 5-6 little short 2-3 gear blasts on nitrous with the 100 pills back in over about 10-15 minutes and it the coke bottle was full of coolant. At idle I could see some small bubbles coming out of the hose, not sure if it's steam or combustion gases.
I let it sit overnight and it sucked it all back in. Does this mean that it's actually pushing water or it's just warming up and puking a bit out?
I put in the TR7's, kicked the timing back to 20*, and put the 50 pills in it.
It has random KR sometimes on MOTOR, so I'm calling that false knock. It knocks a bit on nitrous too, but after the damn window cuts it off lol, so I'm calling that false too. Doesn't matter if it's on motor/spray, it shows about the same amount of false knock. I can't HEAR any knock either.
I then ran it 5-6 little short 2-3 gear blasts on nitrous with the 100 pills back in over about 10-15 minutes and it the coke bottle was full of coolant. At idle I could see some small bubbles coming out of the hose, not sure if it's steam or combustion gases.
I let it sit overnight and it sucked it all back in. Does this mean that it's actually pushing water or it's just warming up and puking a bit out?
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Ok got some updates.
I put in the TR7's, kicked the timing back to 20*, and put the 50 pills in it.
It has random KR sometimes on MOTOR, so I'm calling that false knock. It knocks a bit on nitrous too, but after the damn window cuts it off lol, so I'm calling that false too. Doesn't matter if it's on motor/spray, it shows about the same amount of false knock. I can't HEAR any knock either.
I then ran it 5-6 little short 2-3 gear blasts on nitrous with the 100 pills back in over about 10-15 minutes and it the coke bottle was full of coolant. At idle I could see some small bubbles coming out of the hose, not sure if it's steam or combustion gases.
I let it sit overnight and it sucked it all back in. Does this mean that it's actually pushing water or it's just warming up and puking a bit out?
I put in the TR7's, kicked the timing back to 20*, and put the 50 pills in it.
It has random KR sometimes on MOTOR, so I'm calling that false knock. It knocks a bit on nitrous too, but after the damn window cuts it off lol, so I'm calling that false too. Doesn't matter if it's on motor/spray, it shows about the same amount of false knock. I can't HEAR any knock either.
I then ran it 5-6 little short 2-3 gear blasts on nitrous with the 100 pills back in over about 10-15 minutes and it the coke bottle was full of coolant. At idle I could see some small bubbles coming out of the hose, not sure if it's steam or combustion gases.
I let it sit overnight and it sucked it all back in. Does this mean that it's actually pushing water or it's just warming up and puking a bit out?
Robert
Staging Lane
Joined: Nov 2006
Posts: 76
Likes: 0
From: Central Jersey
yeah i would have done the leak down test on the cylinder and 1 on the cooling system. A good test. See what you got. Hope you find it.
Dyno it on motor now and see if its down on power. You have too much timing in it for sure, and if it was audibly knocking, youll be lucky if something in the motor isnt hurting already.
You guys run too much timing!
You guys run too much timing!