Wide260z Posted January 28, 2005 Share Posted January 28, 2005 I'm currently rebuilding a 280zx motor to put into my 260. I was wondering what the rating of the block was as far as max HP. Last thing i want to do is blow out the bottom of the motor. Thank you Kris~ Quote Link to comment Share on other sites More sharing options...
240zprace Posted January 28, 2005 Share Posted January 28, 2005 I'm currently rebuilding a 280zx motor to put into my 260. I was wondering what the rating of the block was as far as max HP. Last thing i want to do is blow out the bottom of the motor. Thank you Kris~ stock bottomend= tuned right=20-22 psi boost Quote Link to comment Share on other sites More sharing options...
Wide260z Posted January 28, 2005 Author Share Posted January 28, 2005 But as far as how much hp the bottom end can take is what i am wondering. I am going to ceramic coat the pistons and either take the rods to a machine shop or get new ones. I was just wondering how much HP it could take before it became a grenade. Quote Link to comment Share on other sites More sharing options...
johnc Posted January 28, 2005 Share Posted January 28, 2005 What kind of power the bottom end can take depends more on the machining, assembly, and how its run then on the basic design and metallurgy. With forged pistons, custom rods (Carillo), dry sump, custom crankshaft, and other mods the Electramotive guys ran 600+ horsepower in race trim and around 700 hp in qualifying trim. Now, don't just list your mods and expect us to be able to give you a sensible answer. You'll have to do some testing to come up with a reasonable limit based on the quality of your machinist, how well the parts are assembled, and how you use the engine (ie: road racing is much harder on an engine then drag racing and drag racing is harder on an engine then street driving.) Quote Link to comment Share on other sites More sharing options...
drzed Posted January 28, 2005 Share Posted January 28, 2005 The stock bottom end is very strong. For a street/strip car the stock components will take almost anything you can throw at it. A buddy of mine is still running a bone stock never touched F54 bottom end (225K KM) on his turbo 240z and it runs 12.6@114. My 260z was freshened up (new rings and bearings but all other components stock original nissan 220K KM) and it runs 11.78 @ 115. Both cars are street driven often and dead reliable. The most important thing to make it last is proper A/F ratio and ignition timing. Without these even the best forged pistons will fail. Spend your money on good fuel and ignition systems and turbo components and the stock bottom end will work fine untill you are making huge HP. You will be scattering drivetrain peices way before engine components!! Quote Link to comment Share on other sites More sharing options...
slownrusty Posted January 29, 2005 Share Posted January 29, 2005 You are asking a VERY general question....but 300-350hp reliable hp is attainable even on really high mileage turbo engines. Yasin Quote Link to comment Share on other sites More sharing options...
Wide260z Posted January 31, 2005 Author Share Posted January 31, 2005 Yes i understand it's quite general, but i was wondering if i really needed to replace the rods and the crank. I will go ahead and do it just to be safe. Thanks guys. Kris~ Quote Link to comment Share on other sites More sharing options...
Z-Gad Posted January 31, 2005 Share Posted January 31, 2005 Stock rods and crank are fine. Just have the crank journals polished and the rods resized (you can even have the rods magnafluxed to check for cracks if you like), but they will handle tons of abuse. Quote Link to comment Share on other sites More sharing options...
Guest Cronic Posted February 1, 2005 Share Posted February 1, 2005 Rods are forged stock, and will take upwards of 500whp. The pistons are only High temp cast. The ringlands will give out around 400whp. Quote Link to comment Share on other sites More sharing options...
Wide260z Posted February 3, 2005 Author Share Posted February 3, 2005 Thanks guys. The information is very very helpful. Kris~ Quote Link to comment Share on other sites More sharing options...
midnightzxt Posted February 22, 2005 Share Posted February 22, 2005 wanted to bring this back.. Cronic, when you said the rings can take 400whp, is there a better ring to replace the stock ones? Quote Link to comment Share on other sites More sharing options...
fl327 Posted February 22, 2005 Share Posted February 22, 2005 Tuned Standalone fuel, big injectors, properly sized turbo bolted to a stock 28et engine thats running good to begin with has made 300+ in many different peoples rides and can be street driven without issues. Quote Link to comment Share on other sites More sharing options...
2126 Posted February 23, 2005 Share Posted February 23, 2005 wanted to bring this back.. Cronic, when you said the rings can take 400whp, is there a better ring to replace the stock ones? I believe he said the RINGLANDS will give out at around 400RWHP.....not the rings! Quote Link to comment Share on other sites More sharing options...
fl327 Posted February 23, 2005 Share Posted February 23, 2005 Ive seen stock et ringlands take 350hp without issues, and also seen flattop piston ringlands blow themselves off the piston at 300rwhp and too far advanced timing. I believe most forged piston designs have the ringland issue addressed. I myself believe that the L28et is indestructible 300hp and below with a stock block and good efi. Quote Link to comment Share on other sites More sharing options...
Guest Cronic Posted February 24, 2005 Share Posted February 24, 2005 No doubt that 300whp and below the motor is damned hard to break.... but it's just SO easy to make 300whp on the damned thing it's hard NOT to break it. Speaking from expierence here. Quote Link to comment Share on other sites More sharing options...
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