adictionbass

First off i bought this motor over a year ago (like a dumb *** - already built).
Suppoedly its benson sleeved to 84 mm. Arias 9:1 pisons and eagle rods.

When i took the pan off, i took off the oil pick up,got the code off the bottom of the pistons, and confirmed with arias they are 9:1 84 mm. So i know the block is resleeved, but they dont look like benson sleeves to me.

So i got the motor running a few weeks ago. The second time i turned it on it started missfiring. Adjusted the valves, checked a few things, still missing.

Ive had the motor running probably 10 times or so and this weekend was the first time i notice coolant in the oil. There was a little pudding in the oil cap so i said screw it and pulled the head. Only took me about 45 mins, but came across a few things.....



Theres a little brown stuff on some of the rockers:


After pulling the head and wiping everything off i found this:

It looks like someone poked the piston with a toothpick 100 or so times. The walls on every cylinder are smooth like glass. Only #3 is like this. I think number 2 had two little indents.





This is the head with the same markings on the number 3:









Theres the pics... .I need some insight on what i should do. Obviously the head needs to be resurfaced.

Not sure what should be done about the #3 piston. its not near the wall at all.

I filled the intake and exhaust ports with water and none of the leaked. All the valves are seated nicely.

I could not find anything wrong with the headgasket.

And im assuming this are ARP head studs. They were 1/2" 12 points.

Any input is greatly appreciated.

PS: im out of money.... almost


Modified by adictionbass at 8:27 PM 3/15/2005

beepy

Looks to me like a small piece of a spark plug broke off in #3. It then got repeatedly smashed into the quench of the head and the piston before finally passing out through the exhaust valve.

In a OEM motor I would say it might last forever, but in a turbo motor those indents will lead to piston failure... And detonation before that occurs. The sleeves look to be in good condition. I would rehone the cylinders and install a new piston, ensuring it is the same weight as the others. Of course the head needs to be repaired, but nothing serious.

Muckman

iTrader: (2)

Thats def not a Benson block.

*Boostwerks*

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Muckman &raquo;</TD></TR><TR><TD CLASS="quote">Thats def not a Benson block.</TD></TR></TABLE>

I thought the old Benson design was a closed deck?

Muckman

iTrader: (2)

Perhaps. Must be really old if thats the case.

allmotrjdm

Looks like detination, to me , or something got broke off and was getting smashed, from the piston, since it is on the block to.

PyroProblem

I agree, looks like a plug tip broke or detonated off and got thrown around the cylinder until it got pushed out the exhaust ...

Id put new pistons in it if it were me. Go the next size up and re-bore/hone. Then you can mill the head to take out the damage and keep the same compression w/ new pistons...
BTW,looks like a Darton block to me

*Boostwerks*

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by allmotrjdm &raquo;</TD></TR><TR><TD CLASS="quote">Looks like detination, to me , or something got broke off and was getting smashed, from the piston, since it is on the block to.</TD></TR></TABLE>

Definetly not detonation. He said earlier that he had never really driven the car, just reved the motor.

Since you also said that the car was missing, I'm willing to bet that part of the plug broke off and caused the damage.

turbo_ef9

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Bryson &raquo;</TD></TR><TR><TD CLASS="quote">

Definetly not detonation. He said earlier that he had never really driven the car, just reved the motor.

Since you also said that the car was missing, I'm willing to bet that part of the plug broke off and caused the damage. </TD></TR></TABLE>

but he also said that he bought the motor used, so the other person could've detonated..

MosesBarrett

i love boost

Jared

is that a blockguard? doesnt look like part of the sleeve in the pictures

DragSource

That has to be from a piece of debris either from the spark plug, or something fell in while installing the plugs.

That's crazy how it made those little holes. . . makes me think it was something other than a piece of the electrode on a plug. (Something harder. . .but who knows)

*Boostwerks*

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Jared &raquo;</TD></TR><TR><TD CLASS="quote">is that a blockguard? doesnt look like part of the sleeve in the pictures</TD></TR></TABLE>

I don't think so. Normally block gaurds sit below the deck of the block.

From the pics, I think the block was sleeved by AEBS.

m R g S r

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Bryson &raquo;</TD></TR><TR><TD CLASS="quote">

AEBS.

</TD></TR></TABLE>

Thats what I was thinking

integranator

iTrader: (2)

garunteed not benson. Looks like detonation to me.

adictionbass

Thanks for the replys...

My plugs are fine, but someone else was driving on this motor before hand. Havent quite figured out why it was missfiring, or where the coolant was getting into the oil.

Its already at 84mm so i dont want to go out any farther.... 4 pistons cost more than one piston... However, number two has two indents, but not peaks, so this one should be okay right?

Im sad.... Def wont make the April 1st meet, unless someone wants to lend me some cash and help me out

More on this later, its almost 3 in the AM

93LSivic

They look to me like original Darton MID's. The AEBS sleeves have smaller coolant holes.
I agree, either a spark plug tip broke off or even a piece of valve guide from a mis-shift piston/valve contact incident.

SOHC_MShue

sorry to hear about your problems. Sucks that you got sold that messed up block without knowing it

BoostR41

Personally I think they look like the old JG sleeves.....anyway I would say get some new pistons or take the entire short block and head to a machine shop and see what they say

PrettyLude

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 93LSivic &raquo;</TD></TR><TR><TD CLASS="quote">They look to me like original Darton MID's. The AEBS sleeves have smaller coolant holes.
I agree, either a spark plug tip broke off or even a piece of valve guide from a mis-shift piston/valve contact incident.</TD></TR></TABLE>

i agree

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BoostR41 &raquo;</TD></TR><TR><TD CLASS="quote">Personally I think they look like the old JG sleeves.....anyway I would say get some new pistons or take the entire short block and head to a machine shop and see what they say</TD></TR></TABLE>

the older style jg sleeves didn't have the holes in them like that, they were completely closed deck

adictionbass

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SOHC_MShue &raquo;</TD></TR><TR><TD CLASS="quote">sorry to hear about your problems. Sucks that you got sold that messed up block without knowing it.</TD></TR></TABLE>

I hoestly think i have the worst luck of anyone on here building one of these.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BoostR41 &raquo;</TD></TR><TR><TD CLASS="quote">Personally I think they look like the old JG sleeves.....anyway I would say get some new pistons or take the entire short block and head to a machine shop and see what they say</TD></TR></TABLE>

There isnt anything wrong with the block itselft, just the piston and the head...

SOHC_MShue

man it seems like theres been a lot of people on here with similar luck lately.

adictionbass

I think you've been just reading all my posts...


Forgot to put this up, before i pulled the head, compression was ~180 across the board.

Does anyone see why i would have coolant in my oil?

This are arp head studs correct?

adictionbass

Bump cuz i dont see where coolant was getting in the oil....

seen4ever

looks kind of like AEBS sleeves to me, you cannot reuse those two pistons. Those little holes will lead to detonation or pre-ignition as they will become hot spots and lead to a major engine failure. the coolant in the coil is strange, unless the headgasket showed some distortions?

those do look like ARP headstuds though.