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 Post subject: Compression test Specs
PostPosted: Wed May 06, 2015 5:56 pm 
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Joined: Fri Mar 13, 2015 7:23 pm
Posts: 13
Location: Canada
What should my cylinder PSI be on a dry compression test? I know it's lower on a turbo motor but not sure what it should be.


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PostPosted: Wed May 06, 2015 7:12 pm 
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a.k.a Bum head
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Joined: Mon May 31, 2004 5:29 pm
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Location: London, ON
About 150psi with the throttle open and no plugs installed.

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PostPosted: Wed May 06, 2015 8:14 pm 
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The motor has sat for many years. This is cranking it with booster cables and a screwdriver, form the first time. I'm getting 105-110. Debating if I should slam some rings in it.


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PostPosted: Thu May 07, 2015 1:01 am 
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a.k.a Bum head
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Location: London, ON
Probably a bit corroded. Put a tablespoon of oil in each cylinder and test again. If the numbers come up, then ya, might as well pull it apart and see what's going on in there. Could be that you're not spinning it fast enough as well. The wet test will tell you what you need to know.

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PostPosted: Thu May 07, 2015 7:41 am 
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Joined: Tue Aug 04, 2009 9:27 pm
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Location: walsh,alberta,canada
all the t3 cars I have owned have been at least 175 psi, they still run great at 150 psi, a little weak at 110 psi. the n/a and turbo engines use the same pistons, n/a calls for 199 psi new, 156.4 psi limit, but I have seen them run decent on lower than that. my t3 fsm says 9.5 to 1, but that may be a typo...

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89 1.0 turbo firefly
2"exhaust,no cats/resonator
3 tech 6*gear
3 tech turbo grind cam
3 tech cylinder head/w/port,polish,blend,oversized s/s valves
gti brake swap
89 white gti twincam....need I say more?
92 metro aka ''blue lump of coal''
92 white metro lsi vert
91 blue chevy sprint (gas sipper)


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PostPosted: Thu May 07, 2015 9:00 am 
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a.k.a Bum head
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Location: London, ON
Pistons are not the same.

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PostPosted: Thu May 07, 2015 1:34 pm 
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Joined: Tue Aug 04, 2009 9:27 pm
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Location: walsh,alberta,canada
sorry,I was thinking of a g13b. t3 should have lower c.r. pistons, but my fsm don't make a note of it....tells you to refer to n/a service manual....?

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89 1.0 turbo firefly
2"exhaust,no cats/resonator
3 tech 6*gear
3 tech turbo grind cam
3 tech cylinder head/w/port,polish,blend,oversized s/s valves
gti brake swap
89 white gti twincam....need I say more?
92 metro aka ''blue lump of coal''
92 white metro lsi vert
91 blue chevy sprint (gas sipper)


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 Post subject: Compression test Specs
PostPosted: Thu May 07, 2015 2:01 pm 
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Joined: Fri Mar 13, 2015 7:23 pm
Posts: 13
Location: Canada
200,000 km on the engine, at least going by the cluster that came with it. My pal parted the car so I'm inclined to believe him. I have a brand new turbo for it, so I think it will work nice with a single ball hone and fresh rings. An extra day to go in the motor.


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PostPosted: Thu May 07, 2015 4:48 pm 
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Joined: Tue Aug 04, 2009 9:27 pm
Posts: 825
Location: walsh,alberta,canada
the last t3 I did had over 250,000 k, no cylinder ridge....ball hone, new rings, good to go. plus parts from 3-tech.

_________________
89 1.0 turbo firefly
2"exhaust,no cats/resonator
3 tech 6*gear
3 tech turbo grind cam
3 tech cylinder head/w/port,polish,blend,oversized s/s valves
gti brake swap
89 white gti twincam....need I say more?
92 metro aka ''blue lump of coal''
92 white metro lsi vert
91 blue chevy sprint (gas sipper)


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PostPosted: Thu May 07, 2015 4:50 pm 
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Joined: Mon Dec 01, 2003 12:47 pm
Posts: 11675
Location: columbus, ohio
the last 2 high mileage turbo3 engines i rebuilt had some serious taper and out of round things going on that needed to be addressed.

i wouldn't count those chickens before they hatch. :-P take the time to carefully measure the cylinder bores before deciding to just throw a ball hone and re-ring job at it. :wink:

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 Post subject: Speaking of 3 tech
PostPosted: Thu May 07, 2015 7:19 pm 
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Joined: Fri Mar 13, 2015 7:23 pm
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Location: Canada
Does 3 Tech ever answer their emails? Super busy building tiny cylinder heads?


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