L92 heads on LQ4 how much compression?
Thread Starter
TECH Fanatic
iTrader: (42)
Joined: Sep 2005
Posts: 1,430
Likes: 2
From: North Fort Worth
L92 heads on LQ4 how much compression? ok i have an LQ4 block with pistons that are dished. stock with 72cc they are around 9.5:1 correct? if i use these pistons how much should i mill the heads which are 69cc stock and how thick of a 4.065" gasket should i use and fit up with the intake correctly? how many cc are the dished pistons? i am trying to figure up on the spread sheet but i am not sure what half of the #'s on there are. trying to get to at least 10.2-10.5:1 if i can. thanks for the help
Nick
Nick
Based on factory LQ4 compression being 9.4, I get 10.4 with a 63cc chamber using a .054 gasket and 65cc using a .040 gasket. Mill about .006 per cc to reduce chamber size. Dish seems to be around 7 cc best as I can tell. If you have Excell I will send you the spreadsheet to play with.
Ron
Ron
Thread Starter
TECH Fanatic
iTrader: (42)
Joined: Sep 2005
Posts: 1,430
Likes: 2
From: North Fort Worth
well i can get a set of LQ4 style pistons for about $200 that are in a 4.030 bore. so if i could make them work its a bit cheaper. but dont know if it is really worth it. also i dont want to have to fly cut and am not sure if the diamonds valve reliefs in the flat tops are large enough for the l92 intake valve. BTW i have the spreadsheet off of here. thanks for the help
