Well went to the track today. Cars running pretty good, so i come up for my first run, I run a 14.7 @91.9 mph. So i come to the end of the track come to a stop and I hear this really bad knocking sound coming from under the hood. And Im like WTF. So i roll up back in line and pop the hood and look and hear a very very lound knocking sound coming from the engine and reved it a bit and it got even louder. So im like F this im going home, So i get home (barely) and see if i can figure out what the problem is so i did a compression test and figure out that I have 3 cylinderrs that are bad, the compression was about half as the others in these cylinders.

Long story short i ran a 14.7 on 5 good cylinders ha ha, But I blew my engine!!!!
I dont know what i want to do, get it fixed to normal, get a new engine or rebuild with performance parts???? Oh yeah and i have no money, probably will have to put on credit card or get a loan!
Help me decide!

BTW The run was WITHOUT Nitrous!!!

 

find a used bottom end and slap it on, that'll get you running cheap on part costs. If you go 96-98GT for the bottom end you'll see a compression bump and a little more power.

You probably beat the ring lands out of the 3 dead slugs so a full rebuild is kinda it if you stay in your existing block. Check craigslist.org and see if someone has a 4.6 for cheap. You can just do the bottom end or go whole hog and repalce the whole engine. Then you'll have your block left to do a build-up on for the next time.

You can use 4.6 bottom ends from just about any 4.6 car or truck. Just make sure to use your oil pan and pickup and your front cover and heads/intake/headers.

 

So i need a new bottom end??? So if want to rebuild my engine what do i need to replace??

 

if you did not mess up the walls and their is enough material to go .030 over you could do that and add new rods and pistons and crank. or you could just get a new short block.

 

Yeah that sounds like a good idea, I just want it to be better and stronger than it was before, I dont want this to happen again

I found a new short block here http://karkraft.com/short_blocks.htm
you think thats a good price???

 

First off, sorry to hear about your bad luck Second, if you have to take out a loan you'll have to pay back, make it worth it. I'd use a DSS long block, you can go back with 281cid or even a stroker up to 306cid. There are other companies that offer crate motors as well. I'm thinking of a 306 longblock for my 1999(wife's car) it has 65000 miles on it and she wants more power, so it's upgrade to a new 06 GT or put about 4500 into a new motor and turn about 400hp. 6500 is too many miles to START adding power. You may also do a shortblock repair and reuse your old heads if $ is the big question. But do it right! the best you can afford! Hell if you can find a low mile 4v or get Ford Racing's Mach1 longblock!

 

Hey thanks for the info, Do you have any links i could go to for these engines?? And if i was to put a crate in there Wouldn't i Have to change the computer and mounting brackets and exhaust too????

Side note- anyone know any good loan companies of where i could take out some money to fix my car?????

 

Wow that really sucks! How many miles on the motor? That seems really strange for it to go like that. Have you been spraying a lot?? It will be interesting to see what you find when the motor is pulled apart.

 

The motor only has 61,000 miles on it, and i have only sprayed twice in the last month and a half... this really sucks... but when its all said and done it should be real nice and fast...But what a pain in the ***

 

Just because you werent spraying when it blew doesnt mean it wasnt nitrous related. What was your a/f and timing when you got the car dyno tuned?

 

I dont know what the a/f is i havent gotten it dyno tuned.... was going to do that soon, i am only running a 50 shot also if that means anything

 

Wow that messed up.....hell my has 84,000 and never had that s*** happen.....and this isnt nitrous related no way with a 50 shot mine takes 125 as if it were candy. Has to be a A/F issue ...man rip that thing apart and figure it out let us know

 

Only a 50 shot? That pretty much tells me that the problem wasnt nitrous related. Especially if you only sprayed it a couple of times. Just slap a low mileage shortblock on it and keep yourself out of debt as much as possible. Bieng in debt is one of the most frustrating things you can do. Dont go with a 96-98 shortblock because you will run into problems with the nitrous at such high compression.

Man im headed to the track on tuesday......hope it stays together long enough for me to run the almighty low 12s...

 

When was the last time you changed your oil......lol....what its happend before

 

I changed the day before i put the nitrous in, Which was about 1000 miles ago... And another weird thing is as soon as i blew it the oil pressure guage started going wacko up and down, i checked the oil and it was fine smelled fine too so i dont know....dont worry about it any ideas you guys have im open too....I think i am just gonna get a beater or see if i can borrow a car for the time being and take my time rebuiling or replacing the engine....

We'll call this operration rebuild The2000GT engine!! ha ha
But seriously guys think of anything I could do as far as rbuilding replacing etc and tell me

 

Well, we can only speculate until the motor is pulled. I do agree that the problem could be juice induced even if the failure happened n/a, although it is really hard to say.

Obviously if you find a burnt piston, then we have the first ever (that I know of) Venom induced nitrous damage. If you have only been running a 50 shot and at least checking your plugs (which I think you told me you were) then you should be fine. If you happened to spray with the timing advanced, then all best are off.

Like I said, we are only guessing. A motor autopsy will tell the whole story. And who knows, maybe you just need a ring job which is a pretty easy fix (at least better then other options) and you could be back on the road with minimal effort.

Then again....

 

BTW, I see you are selling your bottle heater. That would leave me to believe you never used it on your car, so your 50 shot is more like a 35 shot.

Did you have the o2 sensor tapped correctly? Lights all working right??? on th evenom, I mean.

 

So sorry

Now...step into the 5.4 side.......

 

Yep everything is hooked up properly all the lights are working, Yep i have checked the plugs a coupld of times and everything looks fine, I mean the car runs, but with some very loud knocking, all the noise is coming from the cylider head and cylinders have low compression like 25-35 compared to the others witch are about 60

 

Those cylinders are dead, get a nice used short block or have one built from DSS if you going to buy one.

 

Are you sure the cylinders are bad? it could just be the valves sticking or not closing

 

I was thinking and i thought maybe it could be a broken valve spring or springs, It doesn't sound like a rod knock, Its more of a high pitched ratling i wont be able to find out until the weekend to take off the valve covers, who knows??

 

If the oil pressure gage was bouncing up and down, I want to think maybe there's a spun bearing in the bottom end to go with your piston lands being screwed. That's just a guess though. That definitely does suck. It's also the reason mine won't see a track as long as it's used as a daily driver. Thankfully my 83 will be back on the road come this fall.

 

DSS Racing got you covered. For about $3000.00 you can get the Pro Modular Short block good for a ton of power.

 

i would also bet money on the bearings as the oil pressure is a sign of bottom end problems.

 

yeah i was thinking about getting either their 4.6 modular or 4.6 pro modular and slap my heads on there if they are good and put some nice cams on there, if the cams are bad then i will just get some used ones or maybe some comp one if i have the money... then when that is all said and done throw a 150-200 shot of nitrous or put a KB on there!.....It will be nice when it is done, but i really wish this wasnt happening... i have no money, i would have to put it on the credit card, but oh well it will be a new car when it is done
wow i just found out that D.S.S is right by my house, No shipping for me!!!! yay i need to save all the money i can save

 

Check www.vtengines.com www.liverniosmotorsports.com and www.modularpowerhouse.com you can get shortblocks from these guys as well.

 

I checked all of those and they are way expensive, Ive heard a lot about dss and like thier prices, and plus they are right by me, i could go in there and tell them exactly what i want