Guest Nic-Rebel450CA Posted June 29, 2003 Share Posted June 29, 2003 Hey everyone, I am new to Z's but not new to engines in general. I was looking around for information on the internal specs of Z engines and I found that the rods for the 240 engine are just slightly longer than the rods for the 280. Now, would it be possible to use the rods for the 240 with the piston (tops) from the 280 and have a 280 with the same stock bore and stroke but higher comp? Hopefully I'm not just confusing specs that I read Quote Link to comment Share on other sites More sharing options...
SleeperZ Posted June 29, 2003 Share Posted June 29, 2003 You might run into deck height problems going that route. Read up, do some searches. The L series motors are very easy to build high compression just by bolting on an older head like an N42 to a F54 flat top motor and get close to 10:1 compression. There are other uses for the long 240 rods like stroker buildups. Quote Link to comment Share on other sites More sharing options...
Mudge Posted June 29, 2003 Share Posted June 29, 2003 I think the compression goes to something like 14.5:1, in other words, you need other pistons. Quote Link to comment Share on other sites More sharing options...
z-ya Posted June 30, 2003 Share Posted June 30, 2003 Download this program from the Sydney Z Car Club: http://www.zcarclub.com.au/lseries.htm Quote Link to comment Share on other sites More sharing options...
HIWAY ONE Posted July 3, 2003 Share Posted July 3, 2003 Try this site, lots of good info http://www.geocities.com/zgarage2001/z.html Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted July 5, 2003 Share Posted July 5, 2003 Definately download the engine builder program... the problems that you run into are mainly with deck height, I think it's like 1.23mm. Now I think if you start off with dished pistons, the depth of the dish is about 2mm so theoretically you should be able to fly cut the pistons 1.23mm without any problems. But you should probably talk to a realiable mechanic first, you don't want to build up a high compression engine and then have bits and pieces breaking off here and there... I was thinking about doing this, but seeing as I already have the flat tops I'm thinking I'll just get an overbore and shave the head. If you want some more info, go to the discussion boards at http://www.ozdat.com, a guy on there called Steve Lamb has done the swap. Anyway good luck. Quote Link to comment Share on other sites More sharing options...
DAW Posted July 5, 2003 Share Posted July 5, 2003 You can use the early type L28 pistons (10.9cc dish) and machine the rim of the dish down until you've created a flat top. Take it down until the factory oversize markings on the top are still just visible. This will create deck clearance for use with the L24 rod which is 2.4mm longer than the L28 rod. Be sure to use '73-on L24 rods (or L16), and NOT the later Maxima L24 rods which have smaller journals. Alternatively, Sterling makes (or made) a piston in L28 sizes (86mm + overbores) that was used on the L24 rod. Let me know if you decide to go this way, I've got one out in the garage that has a part # cast in it and I could dig it up. It's just a cast piston like the stock Nissan but with a shorter compression ht. DAW BTW, either the machined L28 piston or the Sterling piston will yield a c.r. of about 9.8:1; higher if you overbore beyond 86mm. Quote Link to comment Share on other sites More sharing options...
DAW Posted July 5, 2003 Share Posted July 5, 2003 I'm assuming an N42/47 head for the c.r. DAW Quote Link to comment Share on other sites More sharing options...
Guest zline Posted July 10, 2003 Share Posted July 10, 2003 or you can use a 240sx piston machined .019" with a 1mm head gasket with 9mm 240Z rods and a LD28 crankshaft and come up with 3.1L Quote Link to comment Share on other sites More sharing options...
Guest Nic-Rebel450CA Posted July 11, 2003 Share Posted July 11, 2003 or you can use a 240sx piston machined .019" with a 1mm head gasket with 9mm 240Z rods and a LD28 crankshaft and come up with 3.1L What is the bore of the 240sx piston, is that the same as a 280? Quote Link to comment Share on other sites More sharing options...
Guest zline Posted July 11, 2003 Share Posted July 11, 2003 no its 3mm overbore, 89mm to be exact. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.