Nitrous = boom! uh oh...!?!
Nitrous = boom! uh oh...!?! Well I didnt install the cam and stuff yet, just installed the nitrous, a bigger fuel pump, and an MSD coil.... I went and made two passes to make sure the car was running ok before I tested the nitrous system, ran back to back 11.96, and 11.95 .008 apart......... seemed to run ok so I decided to try the 100 shot, the car was coughed bad, and I shifted ran ok a sec then coughed again, I shifted, car coughed real bad and rpms climbed, ........ran a shitty 11.50 @ 117 , only .4 and 5mph faster. then on the return road noticed it was still coughing, just driving back at 2,000... I was gonna start my valve train swap tommorrow anyway so I have to remove the heads and intake anyway. a friend of mine also said he saw flames from the headers, all the way back to the Rear axle... sorry this might not make much sense but Im really tired at the moment. anyone know whats wrong?
you guys are starting to scare me!, So far ive only been workin on the car an hour, I took off the valve covers, rocker arms, and pushrods, and looked at the valve springs, it all seems ok there, so now im worryin. I hope its something along the lines of a blown head gasket (on a 100 shot?) or a melted spark plug, with no motor damage. I have to go run to the store and get a fuel line tool to finish removing the intake, then, remove the heads...
I dont understand why it would be lean though, I installed a bigger fuel pump, and used the jets TNT recommends. Is that what it means when you shoot 8 foot flames out the headers? that its a tad lean?
I dont understand why it would be lean though, I installed a bigger fuel pump, and used the jets TNT recommends. Is that what it means when you shoot 8 foot flames out the headers? that its a tad lean?
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Joined: Nov 2001
Posts: 10,023
Likes: 6
From: LT1 land...the "409" of the 90s!
What did the plugs look like? Did you test the System to make sure fuel was flowing? I have seen where people had blocked lines or even forgot to remove the valve stem 
Good luck man!
Good luck man!
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Verdad Gallardo Wow, carbon CITY on them plugs, I took the LONG way of checking them, IE, pulling off the intake manifold, and heads lol jk, actually I was going to start my cam swap and weight removing anyway today and the heads need to be machined for the valve springs. and the noise bothered me so I wanted to see in the top end of the motor anyway, got one head off, looked fine, got the other head off, DAMN its dark outside.........uhhhh feels ok? lol I cant feel any holes in the pistons or chunks of metal missing or floating around, but the plugs were TARRed with carbon, and they got about 15 passes on them, 1 with nitrous, is it possible I fouled them real bad, and the popping/8 foot flames, was just fuel/nitrous igniting in the headers? and then on the return road a slight popping from fuel lighting off the the headers? I started it up a few hours later and the noise was 90% gone (headers were cold)...
oh, and the suspense is killing me, will I need to have my heads machined or not for 1.46" crane dual coils? I keep getting diff answers from everyone.
lastly, if the pistons look ok on the tops, and the motor has oil pressure.. Should I just change the oil, and look inside the old filter, see if there are shavings or anything, and if not, slap it back together and run it? This whole event sorta has me super scared on the nitrous now.
oh, and the suspense is killing me, will I need to have my heads machined or not for 1.46" crane dual coils? I keep getting diff answers from everyone.
lastly, if the pistons look ok on the tops, and the motor has oil pressure.. Should I just change the oil, and look inside the old filter, see if there are shavings or anything, and if not, slap it back together and run it? This whole event sorta has me super scared on the nitrous now.
Joined: Nov 2001
Posts: 10,023
Likes: 6
From: LT1 land...the "409" of the 90s!
Hmm.. Interesting. Sounds like to much fuel.
as far as the springs? They are a drop in. When the Cranes go dead you can pick up a set of K-800S for around a Hun delivered. they fit the retainers nice
I would not be afraid to put that motor the way you describe it, back together and run it as soon as I pin pointed the problem
as far as the springs? They are a drop in. When the Cranes go dead you can pick up a set of K-800S for around a Hun delivered. they fit the retainers nice
I would not be afraid to put that motor the way you describe it, back together and run it as soon as I pin pointed the problem
thats what im saying, what if I dont find a problem! just tell myself its the plugs?? also thinking of how hard it was to pull heads, I dont know how im going to torque them back on properly
Joined: Nov 2001
Posts: 10,023
Likes: 6
From: LT1 land...the "409" of the 90s!
Hardest part of torquing the heads is holding the headers out of the way while you do it. I have done it many times.
The problem came when you fired the N2O right? So that system needs checked to pin point the problem. From what you say there is to much fuel. All Plugs in tact yet covered with crap. I would get it all back to gether and running again. If it runns good with new plug drive it for a while and pull the plugs. See how they look N/A.
Go through and check EVERY thing in the N2O system. THings like "are you running the right fuel pressure for the Jets you are using". once you are sure every thing is good go for a short N2o run. Not a full run Just a short run. say as soon as it goes in 2nd hit it and lift before third.
The pull the plugs again. Adjust as needed
Good luck!
The problem came when you fired the N2O right? So that system needs checked to pin point the problem. From what you say there is to much fuel. All Plugs in tact yet covered with crap. I would get it all back to gether and running again. If it runns good with new plug drive it for a while and pull the plugs. See how they look N/A.
Go through and check EVERY thing in the N2O system. THings like "are you running the right fuel pressure for the Jets you are using". once you are sure every thing is good go for a short N2o run. Not a full run Just a short run. say as soon as it goes in 2nd hit it and lift before third.
The pull the plugs again. Adjust as needed
Good luck!
Thanks 2Fast.. You've been a great help... on last question, It was in my head that ALL roller cams were forged, the one I bought from thunder (comp cams 236/242 .555/.576 w/1.6) was CAST! they didnt like screw up and send a flat tappet cam right? the cam card matched the cam I bought.
Joined: Nov 2001
Posts: 10,023
Likes: 6
From: LT1 land...the "409" of the 90s!
No you have to specify a Billet cam. I won't use harderned cams any more. We have had to many come apart.
A cam with those specs really should be a billet. See if they will trade you out for the extra cost of a billet and shipping.
We have just had to many of those hardened cast Comp Cams come apart on us personaly to recomend them. This is Just our experiance. Results may very.
BTW I have found it is always best to go at Least one step higher in springs then comp recomends
A cam with those specs really should be a billet. See if they will trade you out for the extra cost of a billet and shipping.
We have just had to many of those hardened cast Comp Cams come apart on us personaly to recomend them. This is Just our experiance. Results may very.
BTW I have found it is always best to go at Least one step higher in springs then comp recomends
Joined: Nov 2001
Posts: 10,023
Likes: 6
From: LT1 land...the "409" of the 90s!
we never had any break...but we lost four in one year to not being hardened correctly. three wipped out lobes and one lost the oil pump drive teeth.
Other cam manufactures won't even sell them
Other cam manufactures won't even sell them
ohhhh comforting! well I suppose ill just let it ride the way it is, this cam is only temporary! lol I bought a whole bunch of crap to go fast .. REAL fast, before I go to Iraq, when I come back im going 396 with better heads.
I also might have my stocker heads benched tommorrow if its no too expensive, always wanted to know how good a job I did porting them.
LAST question on this post lol...
If I get rid of my coughing and power loss past 5-5,500 AND I've swapped out to this bigger cam... how much more hp do you think I will see?...
I also might have my stocker heads benched tommorrow if its no too expensive, always wanted to know how good a job I did porting them.
LAST question on this post lol...
If I get rid of my coughing and power loss past 5-5,500 AND I've swapped out to this bigger cam... how much more hp do you think I will see?...
Joined: Nov 2001
Posts: 10,023
Likes: 6
From: LT1 land...the "409" of the 90s!
depends on a lot of things. Any where from a loss to a bunch What did you heads flow and what do the new ones flow. what are the specs on the cam you are running now?
What did you heads flow and what do the new ones flow. what are the specs on the cam you are running now? 
this is kinda late, but i have to say it sounds like you just fouled the hell out of the plugs, causing it to run rich as hell (causing the major flameage!!), be sure and run TR6s after the swap.
yeah I came up with the same conclusion.....same as for the wierd popping sounds, but I have about 15 passes N/A on those plugs, and 1 N20!!! Maybe it was those time I vice gripped the fuel return to see if my valve float was a fuel problem....... then an overly fattly jetted nitrous system was the last straw, anywho the TR6s are on my parts shelve.. just waiting for my heads to get back from the machine shop (I dont have a valve spring compressor, or installed height mic.)