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PostPosted: Tue Apr 07, 2009 8:34 pm 
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Joined: Tue Apr 07, 2009 7:50 pm
Posts: 6
Location: Langley BC
Hello I have a 89 gti and i snapped my timing belt at 8600 rpms when switching into 5th. Im sure i bent some valves so im looking for a new head. I plan on getting my broken fixed down the road but i need a spare now.

I found one for sale but i was wondering how i can know if it is broken or in good condition. Its on a block and i plan on pulling it off the block or mabey just buying the whole engine. Can anybody share some wisdom on this subject.

Thanks


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PostPosted: Wed Apr 08, 2009 12:31 pm 
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Location: Canby, OR
8600 into 5th? :huh:

So, how fast was that?

Anyways..... you could do a compression test on the engine you are looking at if you can jimmy a starter on to it to crank it over.

You have pulled the timing belt cover and verified that it is broken and isn't something else, right?

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PostPosted: Wed Apr 08, 2009 1:46 pm 
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Joined: Sun May 04, 2008 11:55 pm
Posts: 524
Location: Victoria, BC, Canada
Quote:
...at 8600 rpms when [missing my shift] into 5th...


More likely.


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PostPosted: Wed Apr 08, 2009 2:34 pm 
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Joined: Tue Apr 29, 2008 8:06 pm
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Location: Atlanta GA 30052
l4mbch0ps wrote:
Quote:
...at 8600 rpms when [missing my shift] into 5th...


More likely.

missed 5th and got 3rd?
with a 22.5" tire, my calculator says 8600 in 3rd is 114mph
8600 in 5th is 193mph?

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looking for:
the time i mispent in my youth

daily driver: red 1991 Metro 3cyl 5sp, roof rack, 8 degree advance,
got 61 mpg combined on 14" tires but i prefer 12"

completed frame up restoration: black 1994 Swift GT 5sp -- like new ! 45mpg


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PostPosted: Wed Apr 08, 2009 5:06 pm 
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Joined: Tue Apr 07, 2009 7:50 pm
Posts: 6
Location: Langley BC
6600 RPM sorry.

Im on crack LOL. Anyways i had it maxed out as always when we all shift in gti's. I also did check the belt, wouldnt that be the first thing i would do ? or mabey the sound of it ripping my timing belt cover to hell might have given it away. I should have changed it when i redid my clutch and tranny, but i was lazy and pressed for time. I paid the price didnt I ? So i think im going to buy a whole new engine because i have probely messed the pistons up as well when they slammed into the valves. Where i go from here im not sure.

I have however found a spare engine and i will test it with a starter and a compression test gauge to see if it is any good. Does anyone know what psi each cylinder should be if it is in good shape ?

Thomas


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PostPosted: Wed Apr 08, 2009 5:45 pm 
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Joined: Sun May 04, 2008 11:55 pm
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Location: Victoria, BC, Canada
Factory numbers should be 205. Not sure if that's wet or dry, but obviously it's high.

~180 is sort of "normal" and feels plenty healthy

~150 or so is near the minimum. They will run and run and run at 150, but it definitely feels a little bagged out.

155 is "factory minimum" with max of 14 psi difference between cylinders, but again @ 150 it will run for miles.


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PostPosted: Thu Apr 09, 2009 3:14 am 
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Joined: Tue Apr 07, 2009 7:50 pm
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Location: Langley BC
Thank you very much for the compression info.


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PostPosted: Thu Apr 09, 2009 6:49 am 
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Joined: Tue Apr 29, 2008 8:06 pm
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Location: Atlanta GA 30052
remember those numbers are for a warm engine
yours will be cold? so a bit lower.

try cylinders wet and dry
a teaspoon of motor oil or WD40
remember to hold throttle open with a vicegrip, or screwdriver, wooden wedge.
all plugs out
good luck

_________________
looking for:
the time i mispent in my youth

daily driver: red 1991 Metro 3cyl 5sp, roof rack, 8 degree advance,
got 61 mpg combined on 14" tires but i prefer 12"

completed frame up restoration: black 1994 Swift GT 5sp -- like new ! 45mpg


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PostPosted: Wed Apr 15, 2009 9:02 am 
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Joined: Tue Apr 07, 2009 7:50 pm
Posts: 6
Location: Langley BC
Thanks for all the help guys, i bought the engine and i tore it down. The bottom end is worn inside where the water pump is and caused water to destroy the head gasket and fill the 3rd and 1st chambers with water. Im going to rebuild the head and take my other good bottom end to build one great motor. Can anyone tell me what i should be doing to this engine to get it ready for a 9 psi build. These are some of my thoughts

Head

port and polish
seals
valves

Bottom end

Bore
New pistons
Rings
Rods
Seals

Any other thoughs anyone as to what eles and what kind of pistons i should buy ???

Thanks


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