Radim Posted April 10, 2013 Report Share Posted April 10, 2013 So last week I found a 219 head with a very hot reground camshaft (Schnieder Regrind from 1983) I needed a block to rebuild after a week of searching I decided to just go back and grab the block I took the head off of.Brought it home tore it spart and noticed it was overbored to 89MM, also came with a lightened flywheel (11-12lbs)Anyway these are the pistons, I want to get new ones but I want to keep the compression ratio around the same (9.5:1 - 10.1)Anyone have a rough idea of what the hell these pistons may be off of, or what I could use in place of them, they're completely flat. Quote Link to comment
Stupid_fast Posted April 10, 2013 Report Share Posted April 10, 2013 I bet they're machined pistons... Are they dished? Cant tell from the pic. @Ranman, KA24e and KA24DE are the same piston, Z24 are 89mm too. 89mm on L20b ?? Can you check the rods? What crank/stroke? Quote Link to comment
Ranman72 Posted April 10, 2013 Report Share Posted April 10, 2013 maybe ka24E or ka24de I think both were 89mm bore Quote Link to comment
Radim Posted April 10, 2013 Author Report Share Posted April 10, 2013 No dish at all, they're completely flat.Block is at the machine shop, but I believe crank was stamped U90 Quote Link to comment
Radim Posted April 10, 2013 Author Report Share Posted April 10, 2013 Con-Rods are U60-2Pin height is about 38MMPiston is 89MM Quote Link to comment
EricJB Posted April 10, 2013 Report Share Posted April 10, 2013 Is it just me or are those water jackets filled with grout or block filler? Quote Link to comment
Radim Posted April 10, 2013 Author Report Share Posted April 10, 2013 Just crystallized gunk. Quote Link to comment
Farmer Joe Posted April 11, 2013 Report Share Posted April 11, 2013 do the pistons have any PN's on em? im sure datzenmike would know what they were with one look.. lol 89mm on an l20 block isnt cutting it close? Quote Link to comment
Laecaon Posted April 11, 2013 Report Share Posted April 11, 2013 89mm is the point where you should be getting the block sonic tested before cutting. 89mm will run very hot. It will also not last very long as the bores will likely go out of round more easily. Quote Link to comment
Radim Posted April 11, 2013 Author Report Share Posted April 11, 2013 They do have part numbers I'll post them when I'm home. Quote Link to comment
blackmarkit Posted April 11, 2013 Report Share Posted April 11, 2013 Piston pin height doesn't match any factory 89mm bore nissan I'm aware of. Ka24e - 34mm Ka24de - 34mm Z24 - 36mm Although most nissan besides the ka and z did have a 38.1mm piston pin height. Quote Link to comment
Radim Posted April 17, 2013 Author Report Share Posted April 17, 2013 Found out what they were, not even Nissan, shit not even Japanese but they're forged..... Hehehe. Quote Link to comment
datzenmike Posted April 17, 2013 Report Share Posted April 17, 2013 Con-Rods are U60-2 Pin height is about 38MM Piston is 89MM Can't be KA as the pin height is wrong anyway. Piston pin height doesn't match any factory 89mm bore nissan I'm aware of. Ka24e - 34mm Ka24de - 34mm Z24 - 36mm Although most nissan besides the ka and z did have a 38.1mm piston pin height. You copied the number wrong... the Z24 is the same pin height as the KA24E at 34mm Radim... 60s Oldsmobile pistons look somewhat like those. Quote Link to comment
Stoffregen Motorsports Posted April 18, 2013 Report Share Posted April 18, 2013 89mm is the point where you should be getting the block sonic tested before cutting. 89mm will run very hot. It will also not last very long as the bores will likely go out of round more easily. For the record, L20B blocks usually are not capable of 89mm, neither are Z22 blocks, but each for a different reason. The only block that will safely bore to 89mm every time is a Z20 block. Quote Link to comment
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