| Re: 383/DMF considerations |
Subject: Re: 383/DMF considerations by rklessdriver on 2009/9/28 1:46:56 It is not nessescary to change anything. I wouldn't be afraid to run it on 91 oct with 10.6 SCR and 8.66 DCR. I run LTX's on 89oct with this compression. With your new AFR heads and that high swirl combustion chamber... your L98 will run on 91oct no problem. If you wanted to drop some compression just for the heck of it... Do NOT do by increasing quench distance (either not decking the block or using a thicker head gasket). That is one of the worst things you could do. Quench plays a big part in how the mixture is forced into a certain area of the combustion chamber during the power stroke. IME .035 to .040 is the magic number... Just put a 20cc dish piston in it. Probe PN 12344-030 ($455.00) has a 20cc dish and gets you 10.3 SCR using everything else I told you. This piston has floated wrist pins like the KB, but uses 1/16 compression rings - so be sure to get the correct rings. Probe PN P3832F-030 ($372.00) has a 22cc dish and gets you 10.14 SCR using everthing else I told you. This piston uses the same 5/64 compresion rings as the KB piston but has pressed wrist pins - so be sure to get the correct connecting rods. You can lower it if you want with either of these alternate pistons - but I don't think you should bother. I would buy the KB 9926 pistons... deck the block till it is .010-.015 in the hole and run the Victor 5746 gasket. Will |
