lynchfourtwenty Posted December 13, 2009 Author Report Share Posted December 13, 2009 Interesting! thanks for the info bro :) Quote Link to comment
bonvo Posted December 14, 2009 Report Share Posted December 14, 2009 if thats the case do it lynch ive seen and heard that truck in person it just sounds pissed off Quote Link to comment
lynchfourtwenty Posted December 14, 2009 Author Report Share Posted December 14, 2009 pissed off is what my trucks all about.. ripping spenchters an takin names.. Quote Link to comment
banzai510(hainz) Posted December 14, 2009 Report Share Posted December 14, 2009 Fineline has sr20det pistons in his lz motor.. an i was like How'd he doit? arent turbo pistons dished????????? Quote Link to comment
zed Posted December 14, 2009 Report Share Posted December 14, 2009 with -2.95 deck, you have no squish (or pinch as Datzenmike says) Would it not be a better idea to deck the block, to get the squish back around .040" - rather than skim the head. Skimming the head will raise compression - and with no squish, you may have knocking... Quote Link to comment
DISLEXICDIME Posted December 14, 2009 Report Share Posted December 14, 2009 with -2.95 deck, you have no squish (or pinch as Datzenmike says) Would it not be a better idea to deck the block, to get the squish back around .040" - rather than skim the head. Skimming the head will raise compression - and with no squish, you may have knocking... you dont want to make the deck on a l20b any weaker then they are all ready l20,s tend to crack as it is . Quote Link to comment
datzenmike Posted December 15, 2009 Report Share Posted December 15, 2009 with -2.95 deck, you have no squish (or pinch as Datzenmike says) Would it not be a better idea to deck the block, to get the squish back around .040" - rather than skim the head. Skimming the head will raise compression - and with no squish, you may have knocking... Decking will also raise the compression. Any space above the piston at top dead center, this would include negative deck height and crushed gasket thickness, is considered part of the combustion chamber. Just for the heck of it, and if it is or was possible to mill 2mm off the deck to decrease the deck height to 0.040" or roughly 1mm the combustion chamber would loose 11.32cc of space the resultant compression would go up to 10.28 Quote Link to comment
lynchfourtwenty Posted December 15, 2009 Author Report Share Posted December 15, 2009 ya hainz det pistons are dished, im curious how fineline went about it, he must have mismatched alot of stuff, otherwise he's prolly got some CRAZY low compression.. if he was on more i'd ask.. the sr pistons was a "hehe haha" type thing.. nothing serious.. lol Quote Link to comment
Jason Posted December 15, 2009 Report Share Posted December 15, 2009 Lynch, instead of the regular head bolts, if you're gonna do this perhaps use ARP studs. My buddy wished he went that route instead of the "turbo" bolts. Quote Link to comment
lynchfourtwenty Posted December 15, 2009 Author Report Share Posted December 15, 2009 (edited) ya i was thinkin of prolly doin the arp's while i was at it.. heres my thing, i dont wanna go to use the truck, or be using it, an all the sudden it shits out on me.. thats why i wanna rebuild the motor, an shit while im rebuilding it.. i might as well upgrade it a little while im at it eh? if all else fails im sure someone would buy it from me.. or trade me lol.. not to mention there are other people doing it.. an running pump gas.. im getting a wide band for my car, i can get a bung welded in my trucks header so i could swap the wideband on whenever i needed.. if i gotta retune it every few months so be it.. but its not like i drive it much anyway.. but when i do drive it, i like to have fun, thats why i drink dos equis Edited December 15, 2009 by lynchfourtwenty Quote Link to comment
lynchfourtwenty Posted December 15, 2009 Author Report Share Posted December 15, 2009 (edited) i think a more realistic rebuild would be, l28 dished pistons l20b block bored to 86mm l20b rods/crank peanut head intake ports ported to 1.375 and maybe some l28 valves installed, an new guides ect. maybe a future cam.. what you guys think? from what i can gather it would have near a 9.0 to 9.1 comp ratio.. an if the head needs shaved a bit, maybe a tad more... which is less then 10.8 with flat tops lol Edited December 15, 2009 by lynchfourtwenty Quote Link to comment
DISLEXICDIME Posted December 15, 2009 Report Share Posted December 15, 2009 ya i was thinkin of prolly doin the arp's while i was at it.. heres my thing, i dont wanna go to use the truck, or be using it, an all the sudden it shits out on me.. thats why i wanna rebuild the motor, an shit while im rebuilding it.. i might as well upgrade it a little while im at it eh? if all else fails im sure someone would buy it from me.. or trade me lol.. not to mention there are other people doing it.. an running pump gas.. im getting a wide band for my car, i can get a bung welded in my trucks header so i could swap the wideband on whenever i needed.. if i gotta retune it every few months so be it.. but its not like i drive it much anyway.. but when i do drive it, i like to have fun, thats why i drink dos equis i think a more realistic rebuild would be, l28 dished pistons l20b block bored to 86mm l20b rods/crank peanut head intake ports ported to 1.375 and maybe some l28 valves installed, an new guides ect. maybe a future cam.. what you guys think? from what i can gather it would have near a 9.0 to 9.1 comp ratio.. an if the head needs shaved a bit, maybe a tad more... which is less then 10.8 with flat tops lol l18 pistons in your l20. you would be surprised how much power you will gain back just from a rebuild. and with some flow tricks with head and you will have fun! why bother with all this just put a ka in. it is almost bolt in on a truck Quote Link to comment
lynchfourtwenty Posted December 15, 2009 Author Report Share Posted December 15, 2009 l18 pistons in your l20. you would be surprised how much power you will gain back just from a rebuild. and with some flow tricks with head and you will have fun! why bother with all this just put a ka in. it is almost bolt in on a truck hehe no doubt! Quote Link to comment
datzenmike Posted December 15, 2009 Report Share Posted December 15, 2009 i think a more realistic rebuild would be, l28 dished pistons l20b block bored to 86mm l20b rods/crank peanut head intake ports ported to 1.375 and maybe some l28 valves installed, an new guides ect. maybe a future cam.. what you guys think? from what i can gather it would have near a 9.0 to 9.1 comp ratio.. an if the head needs shaved a bit, maybe a tad more... which is less then 10.8 with flat tops lol I get 9.041 Quote Link to comment
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