greasyfj

i have a Web Cam 155 (252/.488) http://www.webcamsha...858_002399.html, going to do head work. i have all ready accumulated all the bells and whistles, im planning a hot street engine L2.3, so using the hyper-eutectic pistons will give me 9.9 compression. not planning to turbo and the forged pistons would only give me 8.8 or so, i will be cc'ing the head and block after the machine work and assembly is done, but seems like the best bet for me in my build would be to stick with the stock 2.8 cc stock ka pistons. sucks that i bought those expensive arias but im willing to pass them along to somebody who is going to take advantage of what they were intended for and build a turbo ka beast :thumbup:

so since i'm no planning to turbo the build im going to use the Nippon pistons and sell the forged, thanks for the knowledge

Im not allowed yet to post pics, maybe someone can re-post my link and embed it so everyone can see. https://drive.google.com/file/d/0BwGUz3GGZ1bASFVxb3hub0Y4T1U/view?usp=sharing the picture is the job card for the Arias pistons the job card says 8.6:1 compression ratio, so that might answer the question ***Thread jacking question*** in the picture the piston on the left is the KA24e ARIAS forged piston (3520300) and on the right is a Nippon NPR KA24e hypereutectic piston(10-600). Notice the dish on each one; it seems like the Arias has more dish which is why i am still confused as to what it may be. The NPR piston actually says 2.88 on the box but the dish is a teeny tiny bit. Doesnt "seem" dished at all. Is it the case, that at the end of the day they are both 8.6:1 compression ratio while the design of the more expensive forged pistons are designed to work safer under boost than the cheaper NPR "dish"? That's my guess, what gives, can someone explain this to me,

thanks, yea that what i figure, the cam i bought has lots of overlap, so i feel safer the more i think about it.

Datzen those Arias figures are way confusing to me also, but i understood it as 11.5cc dish for the set. If I divide 11.5 by 4 pistons(total noob guess here), then i get 2.875 which is same as stock. Do you think this is the case? if so to play devils advocate what would compression be with 8.7:1 pistons, 2.875cc dish and 1mm gasket and 1.2mm gasket? https://drive.google.com/file/d/0BwGUz3GGZ1bAUHVrY1FNemM4YW8/view?usp=sharing thank you for help, i dont think this specific question has been asked before. I know the figure wont be exact because of milled head and milled block, although in my case they are both virgin items and this will be their first time to the machine shop.

wow that's high :thumbup: , is yours a l series 2.3 big bore, and is it still carbureted or FI?

I'm building a 2.3 big bore motor and recently i came across a deal for a set of arias forged pistons that was to good to pass up. Stock ka24e pistons are 8.6:1 compression ratio but aftermarket Arias # 3520300 forged pistons are 8.7:1. Using Jason Gray info and http://www.ozdat.com/ozdatonline/enginedesign/Calculator, i get a compression ratio of 9.9:1 using stock Ka24e pistons -2.8cc dish(ie 8.6:1) and a 1mm head gasket. Question: will using The arias pistons(ie 8.7:1) increase the compression ratio to 10.3:1?? would I be able to run 91 nevada octane safely? Head -U60 Block L20B +4 Camshaft Web Cam 155 (252/.488) http://www.webcamshafts.com/pages/automobile/datsun/install_data/tc_001858_002399.html Crankshaft Z22 Rods L20b Pistons http://arias-pistons.myshopify.com/products/nissan-ka24e-2-4l-sohc-12-valve

ready to buy

this is my first post ya'll, got a '77 620. can someone tell me how to avoid the banhammer?