saysomestuff 0 Posted November 6, 2006 lowering compression ratio is done with spacer gaskets or pistons/rods any particular reason that you don't want a supercharged 16v? Quote Share this post Link to post Share on other sites
Blue_Joe 0 Posted November 6, 2006 I think in all honesty from the months of planning with my engine that we took it as far as is absolutely possible. However I wanted to keep as much of the stock G60 main components ie the 8V head, PG Block and G-Lader Charger to keep it a "G60". Using the original PG block we used different Crank and Rods to extend the throw as far as we could, then overbored the cylinders to 83.5mm - Thats the absolute limit to boring! In order to make it all work the pistons had to be custom made by JE and took 6 months as we had major issues to make such an extreme piston balance. Finally extra cc's had to be taken out of the valve pots (if thats what they are called!) in the head in order to get the compression right. All in all we made 2031cc And as far as I'm aware and Jim at Racepower could manage - Thats the absolute limit to a G60 block! To get anymore I would image a whole engine rethink would have to go on! Quote Share this post Link to post Share on other sites
PeteC 0 Posted November 19, 2006 If you plan to stick with the G-ladder the only thing you may have not fully considered is that ultimately the (fixed displacement) compressor has a finite Kg/sec air mass limit. Increasing the swept volume of the engine will result in the same amount of air but at lower boost and essentially similar performance results. If you plan to change the charger then your compressor type will somewhat be determined by what type of car you want to build. Consequently I sugest you clarify this before you finaslise your CR etc. Quote Share this post Link to post Share on other sites
