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JBeezy
10-18-2018, 07:33 AM
During a WOT run on the interstate, it seems the car over rev’d and I drove on home. Everything seemed fine until I pulled in the driveway. The car seemed to have a miss. No overheating, no smoking, oil pressure still good. I pulled the passenger side plugs the next morning and found #3 as shown in the picture. I regapped the plug and put it I back in. Still has a slight miss at idle but it revs smooth. I have yet to pull the driver side plugs. Opinions please. The wetness on the plug is wd40 I sprayed in there before removing the plug.

https://uploads.tapatalk-cdn.com/20181018/d41442c12f1ad1577e6cbaaa25adf6 16.jpg


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musclemerc
10-18-2018, 08:02 AM
Wow.... I hope that's not piston contact...
fastblackmerc
10-18-2018, 08:11 AM
Wow.... I hope that's not piston contact...

What else would it be?
JBeezy
10-18-2018, 08:44 AM
What else would it be?



That’s all I can come up with


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musclemerc
10-18-2018, 08:53 AM
What else would it be?

Nothing else.... Just hoping this guy isn't in for a rebuild.
MOTOWN
10-18-2018, 09:15 AM
Sorry to see this , but I think a rebuild is in your future.
johnnyrauder
10-18-2018, 09:35 AM
how many miles on the motor?
JBeezy
10-18-2018, 09:47 AM
how many miles on the motor?



67k miles


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JBeezy
10-18-2018, 09:50 AM
67k miles


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Got a built cobra motor that’s built for boost, but...

Engine from a ‘99 Cobra. Teskid block, DSS pistons and h beam rods.


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SGT_MERC
10-18-2018, 10:32 AM
One of my DSS pistons, I used on my last build, came apart on me.
8UWITH6
10-18-2018, 10:36 AM
Bet you broke a ring land. See my signature. :(
justgod
10-18-2018, 10:42 AM
Get a borescope and look at the top of your piston in that hole and look for any bits of metal also.
kirk
10-18-2018, 10:52 AM
Get a borescope and look at the top of your piston in that hole and look for any bits of metal also.

+1 on that
Zack
10-18-2018, 11:41 AM
A piece of piston came off. Continue beating on it. It detonated and you did not hear it
Joe Walsh
10-18-2018, 12:41 PM
A piece of piston came off. Continue beating on it. It detonated and you did not hear it

Hopefully that piece of piston isn't still rattling around in the cylinder....
blazen71
10-18-2018, 12:56 PM
I'm sure a valve chewed on it a bit causing damage, explaining the miss at idle.
JBeezy
10-18-2018, 01:11 PM
A piece of piston came off. Continue beating on it. It detonated and you did not hear it



Honestly I did hear something and let out. I guess it was too late. My car always ran on the richer side at WOT. 10.9-11.2 AFR approx. a buddy of mine has a baroscope and we plan on looking in that cylinder or any others. I’ll reply back with the results.


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SGT_MERC
10-18-2018, 01:32 PM
A piece of piston came off. Continue beating on it. It detonated and you did not hear it


That is exactly what happened to mine, lifted a land...
Marauderjack
10-18-2018, 02:00 PM
Happened to me too......:mad2::argue:

Several pistons broke ring lands and one bent a rod.......pieces ended up in the intake since vacuum was high when I let off........time for the new motor or rebuild!!:(
JBeezy
10-18-2018, 02:53 PM
Happened to me too......:mad2::argue:



Several pistons broke ring lands and one bent a rod.......pieces ended up in the intake since vacuum was high when I let off........time for the new motor or rebuild!!:(



Yea since I never wanted to swap the engine out due to the low miles and now this. Just replaced the tranny a month or so ago


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JBeezy
10-18-2018, 02:57 PM
Sorry to see this , but I think a rebuild is in your future.



What are your thoughts on the ‘99 cobra engine and what will it take to swap it in the MM?

Engine from a ‘99 Cobra. Teskid block, DSS pistons and h beam rods. Kellogg crank if I’m not mistaken.

Or, just rebuild the current engine with new rods and pistons?

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NorthShoreChiMM
10-18-2018, 03:18 PM
I now pronounce the piston and valve husband and wife. Together forever. Sorry, that really sucks.
justbob
10-18-2018, 04:58 PM
Piston to valve would equal BOOM on these. Your ring land broke. Very common.


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JBeezy
10-18-2018, 05:12 PM
Piston to valve would equal BOOM on these. Your ring land broke. Very common.


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Very common? I guess I don’t read enough around here. I never knew that.


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Turbov6Bryan
10-18-2018, 05:31 PM
That head will need work, get that borescope in there and all those chunks that beat on the piston the head will look just like it.

You will need the head rewelded from divots if you broke it right
JBeezy
10-18-2018, 06:24 PM
That head will need work, get that borescope in there and all those chunks that beat on the piston the head will look just like it.



You will need the head rewelded from divots if you broke it right



Sounds horrible. The cobra motor is sounding better every post.


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MyBlackBeasts
10-18-2018, 07:21 PM
Ring land... like they all said. Very bummer :shake:


Sorry dude!


But this lets you build it bigger, better & stronger!!!:banana:
JBeezy
10-18-2018, 07:48 PM
You’re right. No one has commented on the engine and their thoughts other than one person saying they had an issue with a DSS piston.


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8UWITH6
10-19-2018, 05:39 AM
It all depends on the cost of the cobra engine and it actually has the parts in it that the person says it has. I tried the easy button like that and failed. So instead of playing the guessing game on the DBP I will have my builder do rods and pistons, timing chain set, fix the head's and slam it back together.
JBeezy
10-19-2018, 06:13 AM
It all depends on the cost of the cobra engine and it actually has the parts in it that the person says it has. I tried the easy button like that and failed. So instead of playing the guessing game on the DBP I will have my builder do rods and pistons, timing chain set, fix the head's and slam it back together.



We’ve had the engine for some time now. Another good friend of ours assembled it so the build is what it’s said to be.


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stevengerard
10-19-2018, 08:28 AM
If you have the engine and are confident in it, why not. These are not matching number blocks anyway. Your car was modified to begin with.
JBeezy
10-19-2018, 08:49 AM
If you have the engine and are confident in it, why not. These are not matching number blocks anyway. Your car was modified to begin with.



Not really worried about the matching parts. Everything I’ve done to it can be put back to stock besides the engine now. I still have all the stock parts. The engine I feel good about. Just wondering if I will need to modify anything to make it work?


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stevengerard
10-19-2018, 08:54 AM
unfortunately I can't help you with that but maybe PM some of the guys on this site who have done engine swaps. I rebuilt my engine as I didn't have an extra engine but had extra cars so time was on my side.
tbone
10-19-2018, 12:21 PM
Ring lands. Another thing for me to worry about. Thanks a lot!
JBeezy
10-19-2018, 01:07 PM
Ring lands. Another thing for me to worry about. Thanks a lot!



I know how you feel. All these years and never knew that was a common issue. Never even imagined running into this issue at 67k miles and low safely tuned boost


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tbone
10-19-2018, 01:10 PM
I know how you feel. All these years and never knew that was a common issue. Never even imagined running into this issue at 67k miles and low safely tuned boost


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Exactly. Maybe they fail due to a flaw in the casting. Like turbine blades that blast apart from a microscopic defect.
Joe Walsh
10-19-2018, 01:25 PM
Anyone own, or frequent the MACH 1 forums?

:hmmm:

I wonder if those same engine MACH 1s suffer similar 'delicate piston' woes.
I'm sure quite a few are boosted too.
JBeezy
10-19-2018, 01:38 PM
Anyone own, or frequent the MACH 1 forums?



:hmmm:



I wonder if those same engine MACH 1s suffer similar 'delicate piston' woes.

I'm sure quite a few are boosted too.



I don’t know if anyone having this issue. I’ve only heard of the guys having issues with cylinder 7/8. I installed the cooling mod back when we installed the supercharger. This is totally new to me



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Invective
10-19-2018, 02:04 PM
Anyone own, or frequent the MACH 1 forums?

:hmmm:

I wonder if those same engine MACH 1s suffer similar 'delicate piston' woes.
I'm sure quite a few are boosted too.

The Mach 1 Facebook forum is primarily 'sale/trade'. I dream of modifying this system to fit a NA Marauder. Hoping the OP realizes an expedited solution. Now, reconsidering the ADTR/Procharger setup.

Imagining this poking through the hood of my Marauder.

http://i.ebayimg.com/images/i/330756834411-0-1/s-l1000.jpg
JBeezy
10-19-2018, 02:51 PM
Well here it is. Just went in with the scope. Already knew but seeing it was worse. Lol!

https://uploads.tapatalk-cdn.com/20181019/789b583eb97ac5b162c51d7918c912 98.jpg




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BAD MERC
10-19-2018, 02:54 PM
Hey, it wasn't catastrophic. Seems like a rebuild that won't require a block replacement.
JBeezy
10-19-2018, 02:56 PM
Hey, it wasn't catastrophic. Seems like a rebuild that won't require a block replacement.



It looks like the cylinder wall is damaged or is that just the way it appears?


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crownvic97
10-19-2018, 03:07 PM
That sucks man, sorry! Hope you can build it better!
JBeezy
10-19-2018, 03:27 PM
That sucks man, sorry! Hope you can build it better!



Thanks man. It’s all good. Maybe I should have listened to my girl when she told me to sale it a long time ago. I’d never tell her that


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justbob
10-19-2018, 08:26 PM
It looks like the cylinder wall is damaged or is that just the way it appears?


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Mirrored reflection from the camera light.


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Marauderjack
10-20-2018, 03:08 AM
Like Bob said......looks like a reflection!!:confused:

Mine had ring land pieces bouncing around in 4 cylinders and no block damage with only 2 valves beat up in cylinder #7.......you should be OK with your block!!:beer:

BTW, my block didn't even require boring at 252K miles......just honing and new guts then BACK TO WORK!!:bows:
massacre
10-20-2018, 05:06 AM
99-01 heads and cams/intake do not flow as well as 03+ do. But if you are boosted it might not be an issue. If you’re lucky that motor has teksid block they used wap blocks too in those years.
And the Mach shaker on MM hood doesn’t look as good as you think it will. The MM hood is huge and dwarfs it so it ends up looking too small for the car.
ymmv, imho, etc.
sailsmen
10-20-2018, 08:14 AM
Just put a life size sticker of Marilyn Monroe on the hood.
SteelQualityMan
10-20-2018, 05:31 PM
During a WOT run on the interstate, it seems the car over rev’d and I drove on home. Everything seemed fine until I pulled in the driveway. The car seemed to have a miss. No overheating, no smoking, oil pressure still good. I pulled the passenger side plugs the next morning and found #3 as shown in the picture. I regapped the plug and put it I back in. Still has a slight miss at idle but it revs smooth. I have yet to pull the driver side plugs. Opinions please. The wetness on the plug is wd40 I sprayed in there before removing the plug.

https://uploads.tapatalk-cdn.com/20181018/d41442c12f1ad1577e6cbaaa25adf6 16.jpg


Sent from my iPhone using TapatalkThat's really interesting because I had almost the exact same plug appearance from cylinder one on my two valve supercharged 4.6 Crown Victoria. In my case the engine had been throwing misfire codes on that cylinder intermittently for a couple of months. Then one day it stopped running on that cylinder all together. That engine runs a maximum of 9 lbs boost and I don't think I was near anything like that when this happened. When I pulled the plug it looked very much like the picture you have there where the side electrode is bent down and is touching in my case the center electrode. I know this is not the original engine in the car but I do not know what is inside it. The car has about a hundred and ten thousand miles on it total and I do not know when the engine was swapped out. I can try and find some of that out from the guy that built the car. I have a slightly different theory than a broken piece of piston my theory is I've got a leaking injector on that cylinder and at some point that cylinder just filled up with gas and kerr Bang. I replaced the plug and the coil pack and the car seems to be running very well now.

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Marauderjack
10-21-2018, 02:45 AM
I have a slightly different theory than a broken piece of piston my theory is I've got a leaking injector on that cylinder and at some point that cylinder just filled up with gas and kerr Bang. I replaced the plug and the coil pack and the car seems to be running very well now.

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A bore scope will tell the story for you too.......probably a ring land as well since a cylinder full of fuel would HYDRO-LOCK your engine!!:shake: