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Deano
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 Posted: 04 Nov 2014, 10:00 |
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| Filter & Exhaust |
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Joined: 18 Sep 2012, 21:11
Posts: 260
Location: Blackheath (northern suburbs)
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Bump updates?
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Fear is just words
But driving an Opel is a reality.
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Gemmerkat
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Posted: 10 Nov 2014, 08:52 |
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| Cruising with a Cone Filter |
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Joined: 14 Aug 2014, 21:02
Posts: 25
Location: Paarl
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2 weeks later and still waiting for the engine bearings 
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corsa gsi turbo 170kw
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Gemmerkat
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Posted: 25 Nov 2014, 11:17 |
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| Cruising with a Cone Filter |
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Joined: 14 Aug 2014, 21:02
Posts: 25
Location: Paarl
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so the bearings has arrived. crank, conrods and pistons are in the block. checked the bearing clearance. everything in spec. head is also finished, new valves and guides and seals.
have done some calculations for the compression ratio. my static cr will be 5.5:1
Bore: 79.5
Stroke: 81.5
Combustion chamber of head: 50cc
Spacer that has been laser cut: 6mm
2 x head gaskets compressed: 0.9mm
Piston dish: -3.5cc
i ended up on 5.62:1 cr. so on low boost 1bar my cr will be 11.24 which will be safe for pump gas and high boost 1.7 bar with water meth 15:1 cr
will start assembly this weekend and will post photos later
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corsa gsi turbo 170kw
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Deano
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Posted: 25 Nov 2014, 13:05 |
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| Filter & Exhaust |
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Joined: 18 Sep 2012, 21:11
Posts: 260
Location: Blackheath (northern suburbs)
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Lekke man
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Fear is just words
But driving an Opel is a reality.
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Pantera
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Posted: 25 Nov 2014, 21:10 |
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Joined: 06 Jun 2007, 08:48
Posts: 1065
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You can't work out compression ratio like you are doing and 5.5:1 static comp is way too low, the car will be dead, you going to need 2 bar boost to make 120kw
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Wayno
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Posted: 25 Nov 2014, 22:07 |
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| Opel Club Cape Town Member |
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Joined: 12 Apr 2009, 21:19
Posts: 1619
Location: Bellville
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Do u have to fit a spacer and 2 head gaskets?? If you bought Low comp pistons I'm sure u don't need all that man.
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Gemmerkat
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Posted: 27 Nov 2014, 14:19 |
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| Cruising with a Cone Filter |
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Joined: 14 Aug 2014, 21:02
Posts: 25
Location: Paarl
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Ok sorry. Made an mistake on the head. Its actually 32cc. Which will change my cr to 6.75:1.
How do you calculate cr?
Old setup were like this
Piston dish 8cc and flat on the top off the block
Stroke 81.5mm
Bore 79mm
Gasket diameter 80.2mm
Gasket thickness with spacers 5.4mm
Head combustion chamber 32cc
Then i got 6.9:1
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corsa gsi turbo 170kw
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Gemmerkat
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Posted: 27 Nov 2014, 14:24 |
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| Cruising with a Cone Filter |
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Joined: 14 Aug 2014, 21:02
Posts: 25
Location: Paarl
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Wayno when i stripped the engine i didn't know what ill find. But what i found was a gasket, 3x 1.5mm spacers and another gasket.
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corsa gsi turbo 170kw
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Pantera
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Posted: 27 Nov 2014, 15:51 |
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Joined: 06 Jun 2007, 08:48
Posts: 1065
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I wouldn't go under 8.5:1 compression
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Pantera
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Posted: 27 Nov 2014, 15:51 |
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Joined: 06 Jun 2007, 08:48
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Gemmerkat
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Posted: 27 Nov 2014, 16:11 |
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| Cruising with a Cone Filter |
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Joined: 14 Aug 2014, 21:02
Posts: 25
Location: Paarl
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I used that calculator. The standard pistons had a deeper dish than the 8.5:1 wossner pistons i ordered. Thought it was going to be deeper but it wasn't. So i had to make changes. But i'll see what happens saturday
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corsa gsi turbo 170kw
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Gemmerkat
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Posted: 27 Nov 2014, 16:16 |
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| Cruising with a Cone Filter |
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Joined: 14 Aug 2014, 21:02
Posts: 25
Location: Paarl
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There is also a boost compression calculator i used to check how the comppression would change under boost pressures. What is the max compression before detenation starts?
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corsa gsi turbo 170kw
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Pantera
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Posted: 27 Nov 2014, 18:26 |
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Joined: 06 Jun 2007, 08:48
Posts: 1065
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You can't work out what your dynamic compression ratio will be using boost without knowing certain things like camshaft specs, valve opening degrees, volumetric efficiency etc, so rather don't waste your time with that, also how are you arriving at your various cc's because stock those engines are over 10:1 compression ?
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Gemmerkat
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Posted: 01 Dec 2014, 15:42 |
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| Cruising with a Cone Filter |
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Joined: 14 Aug 2014, 21:02
Posts: 25
Location: Paarl
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corsa gsi turbo 170kw
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Gemmerkat
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Posted: 01 Dec 2014, 15:45 |
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| Cruising with a Cone Filter |
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Joined: 14 Aug 2014, 21:02
Posts: 25
Location: Paarl
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corsa gsi turbo 170kw
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carlgsi
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Posted: 01 Dec 2014, 17:54 |
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Joined: 11 Sep 2007, 15:30
Posts: 910
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Thats a very think compression plate you running. Did you double check you compression ratio again?
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Gemmerkat
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Posted: 11 Dec 2014, 01:51 |
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| Cruising with a Cone Filter |
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Joined: 14 Aug 2014, 21:02
Posts: 25
Location: Paarl
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10 days later and still driving lekkker. engine was a success. now its waiting for dyno to see the results
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corsa gsi turbo 170kw
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Toy
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Posted: 11 Dec 2014, 10:58 |
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Joined: 22 Aug 2007, 01:30
Posts: 7994
Location: Afghanistan
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Gemmerkat wrote: 10 days later and still driving lekkker. engine was a success. now its waiting for dyno to see the results Cool man! Congrats! _________________ "...And I'm not frightened of dying, anytime will do, i don't mind...
Why should i be afraid of dying, there's no reason for it you've gotta go sometime..."
Pink Floyd - Great Gig In The Sky  ex: '98 130i Snoek Bakkie ex: '04 Fiat Stilo 1.6 16V ex: '04 Mini Cooper S Current:
Renault Clio 4 - 0.9 Tce
97 Uno Turbo
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Corsa Addict
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Posted: 14 Dec 2014, 11:14 |
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Joined: 29 May 2007, 13:54
Posts: 49779
Location: Paarl...ex Durbs
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Lekker om vir jou gister te ontmoet het gemmer!
Pity jy kon nie langer gebly het
Kar klink mooi!
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Opel Club Cape Town Member
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