two collapsed pistons

[Neelsonwheels]

Re: two collapsed pistons

I will get the specs on the cylinders. Then post the info. I can't express my gatitude enough. This folks on this forum are awesome. I have belonged to a Harley Sportster list that is similar in the quality of the members. I used Total seal rings in all my motorcycle engine builds and love them. This truck runs 25lbs of boost so I need good rings. The S.S.
rings not liking the street miles may not be a good choice as I am not building a stricley strip motor. The truck is by know means a dailey driver.It is more of a street terror.
My goal is to build it to last 50,000 miles with atleast one trip to the track. I know spending money on a good tune is important and I will not skimp on that at all.Getting through this engine build will be a definate learning expieriance.
Thanks again
Jeff:tup:

 

[alwayscode390]

Re: two collapsed pistons

Its a bummer this happened so quickly ... you have only owned it 2 months right?

Good thing you are asking questions though, thats the first step ---

 

[Neelsonwheels]

Re: two collapsed pistons

I knew that it had an engine noise when I bought it.
The previous owner was very honest about the truck.::tup:
I am not upset or concerned about doing the motor.
It gives me a chance to get to know it!
Jeff

 

[MIGHTYMOUSE]

Re: two collapsed pistons

where are the piston pics? im still holing my breath about all this collapsing business till i see it.

on the other thand though it would be nice for the problem to be something tangeble.

jeff, you are getting some great info here.. but you being newbish i just hope you don't try to go too many directions at once... get carried away.. get over complicated.. get a truck that just sits in pieces..
-find out whats wrong
-find out why it went wrong
-evaluate repair (makes sense to do a refresh at minimum) bearings, rings, pistons maybe, rods could be.. oil pump needs a close look
-evaluate upgrade costs and associate that value to what you are getting (hp, reliability, etc.) for example what are you gaining with an aftermarket crank? i think you're very safe with the stocker and its not a wear item.

i just want to see you with the thing back on the road and enjoying it.. for example the intercooler change over will not even remotely become important until springtime. don't try to REbuild rome in a day

 

[Neelsonwheels]

Re: two collapsed pistons

Hey David,
Great to hear from you.
I just left the shop and have an update for you.
The machinist did a very thorough job with the motor.
This is the deal as far as collapsed pistons go.
The skirt of two of the SRP pistons are out of spec from a very evident amount of
rocking in the bore. The skirt of each has a 3/4 inch wide by 1 1/2 wear mark that
even I can see. I do know a little about the internal working of engines since I have built
four motorcycle engines.These piston weren't happy at all. Whether it was due to the wrist pin bushings or improper piston fitment we will never know.All of the motor parts were disassembled and pressure tested and magnafluxed,the motor was acid dipped and cleaned.There was some scuffing of the wall but he was able to go to 4.030 and clean them up.The heads have two very small cracks that will be stitched and will be of no concern as they pressure tested fine.The crank will be reused it also measured out fine.
He micropolished the journals.The heads will have a complete valve job,the cam will be reused as will the rods,rockers,waterpump,intake ect. . The lifters,oil pump,pistons,wrist pin bushings,will be replaced.I will use coated J&E race pistons,total seal wrings,Melling select oil pump,clevate bearings,cometic head gaskets. I will need to know what ring set to go with though. Please don't worry about the truck or me as I am loving this. I wanted one of these for a long time and this in no way is dicouraging me.If anything it makes me love the truck more.
Thanks
Neels:tup:

 

[nastety92]

Re: two collapsed pistons

I'm glad to see things are going in the right direction. This is a very nice truck you got, good luck with it.

Hope to see you out and about next year in CT. I live in MA and would love to see this truck some day.

Nick

 

[Windedv6]

Re: two collapsed pistons

Neels

Total Seal PN: MT3690-35
This PN# is for a 4.030 bore.

Recommended rings. These are the rings I run in my AWD Typhoon on J&E pistons. This is a great street/strip ring. They are file fit rings and are 4.030 +.005. They are the Total Seal TNT (gapless top) ring set.


From Total seal site:

TNT™ Rings

TNT™ Ring Sets feature our latest Hybrid ductile iron technology. The centrifugally spun, heat-treated ductile iron top ring is specifically designed to withstand the rigors of nitrous oxide and forced induction environments. They’re quick seating, easy on the cylinder walls and available with our optional PVD coatings for further reductions in friction and increased wear ability. 2nd rings are cast iron torsional taper face. Oil rings are 3 piece flex vent design. TNT™ Rings are also available in Gapless®.

• TNT™ Top Rings are Centrifugal Cast for Superior Grain Structure
• Engineered for Extreme Abuse such as Nitrous Oxide, Turbocharged and High Cylinder Pressure Applications
• Tighter Tolerances and PVD Coatings, Reducing Friction and Eliminating Moly Flake


John

 

[Neelsonwheels]

Re: two collapsed pistons

Thanks!
I am ordering parts right now.
Neels:tup:

 

[Neelsonwheels]

Re: two collapsed pistons

Still waiting for parts to arive.
I am waiting for a reply from Hoodtuned.
I hope his site is all straitened out.
I sent payment to his paypal but haven't heard anything.
Mike you out there?
Just wondering about the order I placed with you.
Please get back to me.
I'm getting a little concerned.
Neels