taylor76zharris Posted December 5, 2012 Share Posted December 5, 2012 Hello, Im starting my l28 buld in a few weeks on a motor that i got for free. F54 block and p90 head. it is a turbo motor but i want to go old school and go back with carbs. I want to get close to 200hp and i want to use either dual webers or the stock su carbs. I know i need new flat top pistons, main bearing, rod bearings, maybe e33 head (i heard they have a better quench area). what else should i need. Thanks Quote Link to comment Share on other sites More sharing options...
BluDestiny Posted December 5, 2012 Share Posted December 5, 2012 Well first you need to figure out where that e33 head came from since it doesn't exist. For the block, get new everything( bearing and rings etc) You don't need forged pistons, and you could even bore it out a little. To anyone that tells you to get forged pistons: That depends on what rpm he is going to be making power. A perfectly matched cam can easily make enough power below 7k rpm. Stick with the P90, and shave it, and get it professionally ported. Then match a sufficient cam to it. I've only met one person who was right around the 200whp mark with SU's. If you went with Triples then that's an everyday thing. My friend is making 216whp with mikuni's with his new motor and the most important and costly part was the machine work on the head/cam. Quote Link to comment Share on other sites More sharing options...
OldAndyAndTheSea Posted December 5, 2012 Share Posted December 5, 2012 Headwork Headwork Headwork indeed. Quote Link to comment Share on other sites More sharing options...
taylor76zharris Posted December 6, 2012 Author Share Posted December 6, 2012 E31 i ment, sorry was in a hurry before class. I was hopping someone would say stick with the p90, a lot less fuss trying to find an e31. this will be my first rebuld ever so i hpe it goes smoothly. The L series seems like a fairly simple one to start with. So spend some money on the head and cam, got it. Quote Link to comment Share on other sites More sharing options...
Xnke Posted December 7, 2012 Share Posted December 7, 2012 Spend the money on the head. I'd budget 2000-3000 dollars in headwork, or 60-80hrs, depending on if you're paying with cash or with your personal time and tools. With a P90/flat-top piston configuration, shoot for 9.0-9.5 :1 compression unless you want to run a very late intake valve closing, or you are willing to work around detonation with either race gas or conservitive timing. You can get away with a little more, but it becomes much harder to work with very quickly above 9.5:1, although some folks run 10:1 and higher on pump 93. Cam accordingly. Quote Link to comment Share on other sites More sharing options...
taylor76zharris Posted December 8, 2012 Author Share Posted December 8, 2012 I want to keep it as streetable as possable so i want to keep the compression around 9.0:1. so i can run pump gas. So new valves, springs, a well suited cam, and maybe shave the head? how much can i get away with or should i even worry about it? Are the stock 280 valves good for replacements? Quote Link to comment Share on other sites More sharing options...
Xnke Posted December 8, 2012 Share Posted December 8, 2012 (edited) No....You have completely missed the message here. Headwork. Not a valve job, Headwork. That means getting it ported, flow tested, ports touched up, flow tested, match the intake manifold to the cylinder head, pick a cam appropriate for the port flow, intake manifold flow, and desired torque peak, and then tuning it all to play nice together. In addition to all the above, you would install new valves, have the seats recut, install springs suited to your cam lift and seat pressures, install the correct spring shims, measure for and install the correct thickness lash pads, and ensuring that you are using new or reground rocker arms with your new cam. Some folks say you don't need them...others, including myself, wouldn't install a new cam without reground rockers. A flat-top L28, with a P90 head, will net you 8.8:1 compression, approximately. Shave the head until your chamber size is reduced enough to produce the compression you want...but you'll need to have the valves unshrouded BEFORE shaving, because the chamber size will increase 1-2cc with this operation. If you're not ready to spend either a LOT of garage time with the correct tools and patience to finish the job, or spend the equivalent in cash money to someone who is, just put together a flat top bottom end with quality parts, and install the P90 head. A set of nice headers, a properly sized cam (talk to you cam grinder about that) and make sure you set up your cam geometry, and call it a day. Skip the dual webers, if you're talking about the DGV downdrafts. They're *ususally* more trouble than they are worth, and don't have any real advantages over a set of SU's. If you are talking about the Weber MCHH sidedrafts, then they *MAY* have some advantages, but you will need to construct a custom linkage. I don't know the answer on that one. Edited December 8, 2012 by Xnke Quote Link to comment Share on other sites More sharing options...
z-ya Posted December 12, 2012 Share Posted December 12, 2012 You are on the right track. This is what I would suggest: - Flat tops - P90 head with fresh vavle job - Choose a street cam with 460 or less lift so you can use the stock valve springs. Something with an advertised power band of 2000 to 6000RPM - New, correct thickness lash pads to match your new cam - SUs with SM needles - Header This setup should allow you to run upwards of 35 degrees of total advance on pump gas. Don't shave the P90 head anymore than to just get it clean and flat. Properly tuned, this setup will make 200 crank HP all day. Pete Quote Link to comment Share on other sites More sharing options...
taylor76zharris Posted December 13, 2012 Author Share Posted December 13, 2012 Awesome, thanks you guys so much. ive been trying to put together a build list just like that one. Now ill start collectiong the parts i need. Datsunpartsllc.com has some ITM pistons in standard bore size, these are pretty good parts right? Once again, Thanks Quote Link to comment Share on other sites More sharing options...
z-ya Posted December 13, 2012 Share Posted December 13, 2012 Yes, the ITM pistons are good. You can get them elsewhere for cheaper. The part numbers are: ry6134 std bore ry6134-020 +20 over ry6134-030 +30 over ry6134-040 +40 over Quote Link to comment Share on other sites More sharing options...
BluDestiny Posted December 13, 2012 Share Posted December 13, 2012 (edited) For the love of god don't buy anything from him (datsunpartsLLC). He has a nasty rap, just do a quick search on this site. Order ITM pistons from someone else Edited December 13, 2012 by BluDestiny Quote Link to comment Share on other sites More sharing options...
Lazeum Posted December 13, 2012 Share Posted December 13, 2012 I've got a F54 / p79 combo and the head is not shaved at lot. CR is around 9.0/9.5 as other people have suggested above. It is a great combo with plenty of torque. The Cam on my engine is coming from Rebello. Do not forget to think about timing management with your engine; to get the most HP out of your engine, you'll need something appropriate. Regarding part supplies, I got everything from http://www.clarksdiscount.com/ They were great with me, very responsive & very fast (order done on Monday in France, parts were at home on Friday). I've got nothing but good comments so I share the link. Quote Link to comment Share on other sites More sharing options...
Randall Posted December 14, 2012 Share Posted December 14, 2012 (edited) http://www.store.partsdinosaur.com/page278.html This guy was a pleasure to work with and the cheapest i could find when i ordered ITM dished pistons for my turbo setup... Also a cam regrind is another good route. There are a few recommended places to have your stock cam regrind just search. BTW datsunllc gets a thumbs down from me and don't ask why Edited December 14, 2012 by Randall Quote Link to comment Share on other sites More sharing options...
z-ya Posted December 14, 2012 Share Posted December 14, 2012 I've got a F54 / p79 combo and the head is not shaved at lot. CR is around 9.0/9.5 as other people have suggested above. It is a great combo with plenty of torque. The Cam on my engine is coming from Rebello. Do not forget to think about timing management with your engine; to get the most HP out of your engine, you'll need something appropriate. Regarding part supplies, I got everything from http://www.clarksdiscount.com/ They were great with me, very responsive & very fast (order done on Monday in France, parts were at home on Friday). I've got nothing but good comments so I share the link. Thanks for the clarkes discount tip. Great prices! Pete Quote Link to comment Share on other sites More sharing options...
taylor76zharris Posted December 14, 2012 Author Share Posted December 14, 2012 (edited) Wow thanks for the heads up, i was going to buy from him. Also thanks for the parts numbers, very helpful. Ordering pistons today from clarks,. I just want to make sure im getting the right ones because the part numbers dont match but they say they will work with my engine (l28 f54). Part number is RY2700-20, Im guess ing those are 20+. I was hopping to get standard bore which it looks like they dont cary. They do have very good prices though, compared to everyone else. Edited December 14, 2012 by taylor76zharris Quote Link to comment Share on other sites More sharing options...
z-ya Posted December 14, 2012 Share Posted December 14, 2012 (edited) Those are dished and for early L28E engines with N42 block and N47 head. You need to order them for an 82-83 280ZX non turbo. Edited December 14, 2012 by z-ya Quote Link to comment Share on other sites More sharing options...
taylor76zharris Posted December 15, 2012 Author Share Posted December 15, 2012 I've got a F54 / p79 combo and the head is not shaved at lot. CR is around 9.0/9.5 as other people have suggested above. It is a great combo with plenty of torque. The Cam on my engine is coming from Rebello. Do not forget to think about timing management with your engine; to get the most HP out of your engine, you'll need something appropriate. Regarding part supplies, I got everything from http://www.clarksdiscount.com/ They were great with me, very responsive & very fast (order done on Monday in France, parts were at home on Friday). I've got nothing but good comments so I share the link. Thanks z-ya. i found some good pistons on ebay. What do you mean about timing management? like adjustable cam gear? is the distributor adjustable? Quote Link to comment Share on other sites More sharing options...
Lazeum Posted December 16, 2012 Share Posted December 16, 2012 If you change the internal on your engine, timing requirements will be different. Idle timing, total timing and everything in between will be different. You won't get full advantage of your new engine without a good tuned ignition. Quote Link to comment Share on other sites More sharing options...
z-ya Posted December 18, 2012 Share Posted December 18, 2012 You don't need an adjustable cam gear for the build you are doing. You just need to make sure everything lines up with the stock timing marks as per the manual. If you don't have a book on how to do a rebuild on an Lseries, get one. Quote Link to comment Share on other sites More sharing options...
taylor76zharris Posted June 16, 2013 Author Share Posted June 16, 2013 What intake will work on the p90 head for carbs? Will the E88 intake fit the p90 head? Quote Link to comment Share on other sites More sharing options...
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