Exotic-metal55

Picked the car up from the dealer and put about 100 miles on the new motor with forged pistons.. Motor is nice and quiet, no smoke, and no noticable blow-by,,,so far.. It is 100 plus deg. here everyday but power still feels good so far. Still taking it easy and have not gone over 3700 rpm so far. I was expecting a little more noise from the Wiseco forged but everthing is real quiet.. Interesting to see how the nikasil coated block with forged pistons will last and perform. On paper, the combo seems great.

New motor mounts really took the 70mph vibration out.

PS, pictures to come soon of all the Kaboom parts. Nasty stuff. No one has been able to figure out what happened yet. So, will leave it up to the veiwers on the board for help..

prodigymb

when did your engine blow?

slownrusty

Why would Forged pistons not be quiet? All new forged pistons have a % silicone in them to siginifcantly improve the metallurgy for reasons such as expansion. Only the real old Forged pistons pre '80s diesel on start-up.

Yasin

madgoat

Or a crappy engine builder....

Exotic-metal55

Few months ago. I just let it sit and went back to making money.. After a break, got back after it..

What I meant to say; these are custom pistons. A person whom I did not know ordered them and had them made to factory sizes. So , was not sure what the outcome would be. Pistons were also made for a bottom guided motor and required custom thrust washers to be made. Second, like Madgoat said.. Also, not sure if pistons were installed with offset in correct position either. Not even sure if the custom pistons had other glitches involved in thier making.

I also noticed that the cross hatch hone on the Nikasil bore was really flat and I had not seen that before . I hear buidlers use a plateau hone technique now but not sure what that looks like finished.

Have about 150 miles now and still no smoke, plenty of power and fuel mileage is dead on the last motor.

prodigymb

possible causes? i think a noticed a broken ringland on the piston picture you posted.

Exotic-metal55

(The Piston in Pic above) with the broken ring land is not from my car. That is from a E55 that burned the piston using Nitrous. I have the repaired block (Nikasil coated) , that used to house that piston.

My number 8 piston is in little peices all over the block. Nothing to show. I plan to post all the pictures, and maybe as a collective group, we can figure out what happened. If not, it may just scare the hell out of others to be carefull in what they do.. These are damn tough motors but hard and expensive to fix.. Working on them is easy but with Alusil cylinders and virtually no after market bottom end parts, not many options.

Blue_Monster

Just out of curiosity, Did your car have supercharger spacers installed before the engine blew up?

Exotic-metal55

Do you mean phenolic spacers? If so,, no. I just have what is in my signature. Why? Are there problems with them?