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PostPosted: Mon Oct 23, 2017 4:09 pm 
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998cc
998cc

Joined: Mon Apr 05, 2004 11:23 am
Posts: 580
Location: Eastern Melbourne
Ok, Based on a roots supercharger filling the cylinders of an 8.3:1 1275cc, no (limited) after(inter) cooling, what gap specs would be best for cast pistons? Im expecting to be running rather hot.


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PostPosted: Tue Oct 24, 2017 6:34 am 
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Oh dear, worry, worry...

Joined: Fri Jun 19, 2009 5:31 pm
Posts: 686
Location: North Rocks
Hi Besser
.010 to .012 thou for the top ring and .014 to .016 thou for the second ring compression ratio 9.5 to 10 to one and 10 LB boost
Graham Russell

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PostPosted: Sun Dec 03, 2017 8:47 am 
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1098cc
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Joined: Sat Feb 22, 2014 10:13 am
Posts: 1362
GR wrote:
Hi Besser
.010 to .012 thou for the top ring and .014 to .016 thou for the second ring compression ratio 9.5 to 10 to one and 10 LB boost
Graham Russell
Hi Graham, would you recommend the same gaps on a std static compression 998? (with as much boost as it will comfortably handle on 98 octane and meth injection)


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Build thread for Supercharged 1275 1967 Deluxe Resto
Build thread for Mini ute conversion 998cc Turbo


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PostPosted: Sun Dec 03, 2017 6:26 pm 
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Oh dear, worry, worry...

Joined: Fri Jun 19, 2009 5:31 pm
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Location: North Rocks
Hi Morbo28
That will work fine on your 998.
Graham russell

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PostPosted: Mon Dec 04, 2017 6:17 pm 
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1098cc
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Joined: Sat Feb 22, 2014 10:13 am
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GR wrote:
Hi Morbo28
That will work fine on your 998.
Graham russell
Thanks GR, much appreciated

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Build thread for Supercharged 1275 1967 Deluxe Resto
Build thread for Mini ute conversion 998cc Turbo


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PostPosted: Thu Dec 14, 2017 7:16 pm 
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998cc
998cc

Joined: Wed Jul 02, 2014 11:38 am
Posts: 508
I had a six cylinder turbo 202 torana Suck thru Double standard horsepower on a TO3 Garret turbo .Water methanol injection.
Bottom end was standard and never broke a thing but shocked some people. Dyno man was not BS He said I know what a good standard one does and dont know my dynoes accuracy .
He said yours does double. :D Was 9 psi boost with a RAMS head .Had to pull it down once to get CR better was young and CCed nothing


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