Viva Datsun Posted March 3, 2016 Share Posted March 3, 2016 Alright, let me start off by apologizing, because I know for a fact this has been covered a million times before. But I've been really sick the last couple days and I'm not perfectly lucid right now. Anyways, I just wanted somewhere to keep track of everything that actually relates to my project specifically. So, I've got an F54 block and either a P79 or an N47 (I know, I know...). I've been doing a lot of barely sober research today because I actually have time off from work and I've been getting a lot of mixed answers about the efficiency of the N47/ flat top piston combo. I know according to the L Engine calcualtor that it'll put me at 10.08:1ish and that with a stock cam you run into detonation issues. I've also read that a bigger cam will lower the dynamic compression enough to get by on premium pump gas. Now I just need someone to validate my idea here. F54 w/ flat tops, N47 head with mild port work, triple Weber 40's, MSA 3-2 header, and Web Cams 155a http://webcamshafts.com/index_blank.html?pages/vehicle_search.html Is this enough cam to keep me from pinging with the N47, and is this cam appropriate for the rest of the motor? If it helps I'm running a 83 five speed and a 4.38 diff. Also I'm in Utah at about 5000 feet if that helps. Keep in mind this is a weekend car at best. Thanks for putting up with my medicated ramblings. Hopefully this was't too unnecessary Quote Link to comment Share on other sites More sharing options...
Viva Datsun Posted March 3, 2016 Author Share Posted March 3, 2016 Also one of my coworkers knocked my #4 piston off of the table and put a small dent on top. Is this gonna be a problem? Quote Link to comment Share on other sites More sharing options...
NewZed Posted March 3, 2016 Share Posted March 3, 2016 I know for a fact this has been covered a million times before. Also one of my coworkers knocked my #4 piston off of the table and put a small dent on top. Is this gonna be a problem? A billion. Unshrouding the valves will enlarge the combustion chamber. Ponder that in your delirium. Beware "state dependent memory". A theory that you recall things best in the same state you were in when you learned them. Yes, but you'll probably get over your anger at him/her and things will get back to normal. Quote Link to comment Share on other sites More sharing options...
Viva Datsun Posted March 3, 2016 Author Share Posted March 3, 2016 Beware "state dependent memory". A theory that you recall things best in the same state you were in when you learned them. That's pretty much why I started this thread. To help me keep track of everything I'm thinking about on my first day since the new year. And i cant find a pencil to write with Quote Link to comment Share on other sites More sharing options...
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