Got some bad news [Archive]

97Gs-t

07-01-2008, 06:52 PM

The gst started acting funny a couple weeks ago since then i parked it.

Today i finally had time to do a compression test and here are the results..

Cyl #1. 150psi
Cyl #2. 180psi
Cyl #3. 0
Cyl #4. 165

total of 1021 miles on the motor

Ross 9:1 .60 over
Eagle Rods
Clevite Main/Rod bearings
Polished Crank

I dont understand how this happened. This motor never seen over 5k and i never beat on it. I babied this damn motor.

At 500 miles i did a test and i got 175psi across.

Idk what to do you guys...this will be the third time ive pulled this motor...

BoostinPower

07-01-2008, 07:56 PM

60 over? Thats a hell of a bore.. I take it all of the rings were replaced when you rebuilt it last time?

What was the cause the last time you did pulled the motor?

dragonov_elite

07-01-2008, 08:04 PM

Did you have a shop build it or your self? It seems like the other cylinders are jumping around quite a lot in compression. What head gasket where you running? ARP's?

97Gs-t

07-01-2008, 09:34 PM

60 over? Thats a hell of a bore.. I take it all of the rings were replaced when you rebuilt it last time?

What was the cause the last time you did pulled the motor?

I originally bought the car with a apparently broken rings. I paid 4k for the whole car w/6bolt .20over wisecos and a bunch of extras.

i got the car home pulled the head i was littleraly able to rock every single piston back and forward and side to side.

I took the block to carquest of antigo to get the block checked out.

It ended up being the cyls were wore out .48 and i was unable to find a 6bolt block so i got the .60 from ross.

So me and my brother a (machinist) decided to try something new and put the motor together ourselfs.

Well to sum it up the first time we gapped the rings to large so i had very little compression i think 80psi

So then i pulled the motor again. Ordered new rings took the whole block to carquest and he did the whole motor over. (no warranty on turbo motors)

So this will be the third time this motor will be pulled out of the car.

DE
Yes i am running arp headstuds.

As for Hg i believe topline. Jim at carquest put new gaskets on the top and bottom end and the boxes i got back said topline.

DontStopMe

07-02-2008, 01:27 AM

So you keep using the same pistons and same block? I would assume one of your pistons is bad or the block was never machined properly

dsm430

07-02-2008, 07:26 AM

i had a head gasket do that ,but u never know till its riped apart,,

is it for sale????

97Gs-t

07-02-2008, 11:13 AM

So you keep using the same pistons and same block? I would assume one of your pistons is bad or the block was never machined properly

I used these pistons over because they had zero miles on them.
Had the block and the pistons inspected everything was in spec.

i had a head gasket do that ,but u never know till its riped apart,,

is it for sale????

Sorry not for sale.

97Gs-t

07-02-2008, 11:19 AM

Ok so I have a stock 6bolt in my garage and im going to drop this in after it gets some new parts.

Hopefully i can get this done before my birthday..

Dizmm

07-02-2008, 11:30 AM

Ok so I have a stock 6bolt in my garage and im going to drop this in after it gets some new parts.

Hopefully i can get this done before my birthday..
have you done a leak down test to see where the compression is going on that dead cylinder. maybe its just a broken/bent valve.

DontStopMe

07-02-2008, 01:48 PM

have you done a leak down test to see where the compression is going on that dead cylinder. maybe its just a broken/bent valve.

Good point. Have you been using the same head also?

Dizmm

07-02-2008, 02:38 PM

usually a busted piston ring or something like such will give you at least some compression. if you have 0, its probably a broken valve or a really bent valve.

97Gs-t

07-02-2008, 03:41 PM

Good point. Have you been using the same head also?

Yes i am using the same head.

I have never done a leakdown test before.

When i put air into the cyl what should i be looking/hearing for?

dsm430

07-02-2008, 04:01 PM

just pull the head it takes a hour or two(4 beers)

Dizmm

07-02-2008, 04:12 PM

just pull the head it takes a hour or two(4 beers)

accept its hard to just see a bent valve. a leakdown test will show you where the air is going. if its coming out the intake/exhaust, its something with the valves. if its coming out the crankcase (dipstick or valve cover breather) its something with the pistons/rings.

DontStopMe

07-02-2008, 04:20 PM

If you do take the head off, (once you take the cams out) you can spray brake clean into the port and see if it leaks through, if it does, bent valve or at least a valve job is needed. Depends on how fast it pours through.

97Gs-t

07-04-2008, 01:09 PM

I'm going to pull the head hopefully tomorrow. Pulled the 6bolt block out of the back of my garage.

Ok so there is some light rust on the cyllinder walls.

What solution should i use to remove the rust?

BoostinPower

07-05-2008, 07:53 AM

When you had it bored, did you get it bored .60 or .060?

Coty

07-05-2008, 11:54 AM

97Gs-t

07-05-2008, 02:26 PM

When you had it bored, did you get it bored .60 or .060?

I have no idea i cant seem to find the invoice i had from the shop. i would assume .60 but i wont find out till monday.

I am going to do a leak down test before i go any further. Just pulling the block out as a worst case senario

Devlish

07-06-2008, 02:21 PM

.6??? wow.

did you do your leakdown test before the head pull yet?

97Gs-t

07-06-2008, 02:59 PM

No havnt had the time. I had to work late friday Jims going to lend me his leakdown tester. Monday morning i should have results.

BoostinPower

07-06-2008, 05:50 PM

I have no idea i cant seem to find the invoice i had from the shop. i would assume .60 but i wont find out till monday.

Check on that.. That could be why you had a lot of wiggle room with your pistons ;)

97Gs-t

07-07-2008, 01:07 PM

Results!

First test was at tdc timing marks were lined up and the crank mark was lined up with the oil pump marking.

Cyl 4 62psi which means 38 percent of the air was going through the rings? And air was comming through the breather and dipstick.

Cyl 3. 5psi air was comming through the exhaust.

Cyl 2. 5psi. Air was comming through the intake

Cyl 1 Same results as cyl 2.

Test #2 i turned the motor over till the dowel pins on the cam gears were facing down and the marks lined up.

Cyl 1 Held 40psi air was comming out of breather/dipstick.

Cyl 2 5psi Air through exhaust.

Cyl 3 5psi Air through intake

Cyl 4 5psi Air though Intake

dsm430

07-07-2008, 02:37 PM

is it for sale now ? j/k that happend to me but it was just cams that were wrong

i had no compression on any,damn crower --- o well

97Gs-t

07-07-2008, 11:12 PM

I could never sell this car. i enjoy it to much. I wish i could be something as simple as that though...

Dizmm

07-08-2008, 12:27 AM

97Gs-t

07-08-2008, 01:16 AM

i guess at this point, you need to ask yourself what your plans are with the car. I mean if you just want to cruise around with it, push 18-19psi on a 16g, maybe just find a stock 6 bolt complete shortblock and bolt your head on (after you have it checked over by a trusted machine shop) and throw that in the car.

That is what im going for. I have a complete shortblock sitting in the garage..its been in there for a while so there is some rust in the cyls..

All of the timing components pulleys tentioner is brand new plus the new oem water pump will be going onto the stock block. The B/s with a new oil pump. will be removed all new gaskets..New arp headstuds..

Its still a bummer though..
Im going to pull my built block apart when i get it out to see what went wrong.

So i ask. What is the best way to remove rust off of a cylinder

Stash

07-08-2008, 07:48 AM

You'll have to hone the cylinders at the bare minimum(regardless of rust) to get a good surface to break in the rings. That alone may take care of the rust issue, if not, it will have to be bored 0.020 over. Of course you will want to measure for cylinder out of round and taper as well. If you don't have the tools to properly measure those dimensions(Bore gauge, t-gauge and micrometer, ect) you may just want to take the block to the machine shop and have them inspect it and they will let you know what needs to be done. Precision measuring equipment can be quite costly, if you don't build engines often, your probably best off just taking it to a machine shop.

BoostinPower

07-08-2008, 07:51 PM

Ill sell you a monster block ;) Its being built for 500+ at the wheels..

97Gs-t

07-09-2008, 11:35 AM

Ill sell you a monster block ;) Its being built for 500+ at the wheels..

Sounds too expensive for me lol.

97Gs-t

07-09-2008, 06:09 PM

Update #2!

Pulled the head today. Exhaust valve in the dead cyl Was Missing peices.. Plus all the other exhaust valves looked like complete shit.

They had alot of like hard deposit on the valves... Block + pistons look ok!

Im going to have block inspected maybe i can still use it..

what do you guys think?

BoostinPower

07-09-2008, 09:16 PM

are the valves just really carboned up? Missing pieced def isnt good.. Surprised it didnt damage anything else..

97Gs-t

07-09-2008, 09:26 PM

Yeah there was alot of black shit on every exhaust valve..

Checked the pistons out. i am able to move them side to side Foward and Backward. Not very far but the pistons do move.

You guys think the block is toast?

Dizmm

07-09-2008, 11:41 PM

maybe start looking for either a new head or send yours in to have a full rebuild.

dsm430

07-10-2008, 07:31 AM

are the cylender walls ,scared or ,deep scraches ,any scratches

97Gs-t

07-10-2008, 02:19 PM

nope:D

dsm430

07-10-2008, 03:05 PM

good

97Gs-t

07-10-2008, 04:07 PM

I'm going to get the head rebuilt and have the block inspected everything hopefully should be good

97Gs-t

07-10-2008, 06:33 PM

Picts!

http://i328.photobucket.com/albums/l354/Gs-t97/069.jpg

http://i328.photobucket.com/albums/l354/Gs-t97/070.jpg

http://i328.photobucket.com/albums/l354/Gs-t97/071.jpg

dsm430

07-11-2008, 10:30 AM

holly shit
never seen that before
good work (too much boost or what)
only 1000 miles on motor, somthing dint want to be in your motor any more!!

valves not shuting all the way (bad seet), what it looks like??
just a guess, it could be alot of things ,timing?

97Gs-t

07-11-2008, 02:54 PM