tortron Posted June 20, 2022 Share Posted June 20, 2022 Yeah that's a common failure mode of 13 second prius engines 3 4 Quote Link to comment Share on other sites More sharing options...
kpr Posted June 20, 2022 Share Posted June 20, 2022 42 minutes ago, Roman said: Did someone say graph? No? Too bad Yeah would be a 1300cc rev monster. A 1NZFE has a mean piston speed of 25.4 meters per second at 9000rpm. A 2NZ at 25.4 meters per second would be revving to 10,350rpm, and the mega long rod motor would be able to deal with it a little better. Doesnt mean its possible to rev a 2NZ that high without other issues though. But it would certainly be glorious! haha 2.06 is up there! assuming the 1.3 will want to make power at higher rpm, with all your top end on it. i see more flying rods in your future Also being picky, but the 4a/7a combo is 1.78. no one likes an inaccurate graph 1 Quote Link to comment Share on other sites More sharing options...
Roman Posted June 20, 2022 Author Share Posted June 20, 2022 Sorry - fixed it Yeah one of the local guys who rallies 2NZ motors says they eventually break if you keep them going to 8000rpm. So a 10k motor would be on a very limited lifespan without strong rods haha. then there are issues like the oil pump wanting to explode, and so on! 1 Quote Link to comment Share on other sites More sharing options...
kpr Posted June 20, 2022 Share Posted June 20, 2022 can you do some extra janky stuff to the pistons, to lighten them. take a little stress off the rods 1 Quote Link to comment Share on other sites More sharing options...
Yowzer Posted June 20, 2022 Share Posted June 20, 2022 There's a iQ in at work at the moment, I thought that would be pretty hilarious with a high revving engine. Stuffed knows what you can do with the NR engines, aside from swap them out. Quote Link to comment Share on other sites More sharing options...
GARDRB Posted June 20, 2022 Share Posted June 20, 2022 4 minutes ago, kpr said: can you do some extra janky stuff to the pistons, to lighten them. take a little stress off the rods Homemade short skirts 1 Quote Link to comment Share on other sites More sharing options...
kpr Posted June 20, 2022 Share Posted June 20, 2022 3d printed pistons 4 Quote Link to comment Share on other sites More sharing options...
shrike Posted June 20, 2022 Share Posted June 20, 2022 1 hour ago, kpr said: 3d printed pistons 2 Quote Link to comment Share on other sites More sharing options...
Popular Post Roman Posted June 21, 2022 Author Popular Post Share Posted June 21, 2022 I got the head off today. A rough timeline of events, based on evidence: -Cylinder 2 rod went asplode -Lower part of the broken rod smashed the engine block, front and rear. -The still full throttle engine, probably thanks to my new intake design that has runners pointing to this area (haha damnit) sucked a piece of debris into cylinder 4. -Cylinder 2 piston rotated in the bore slightly while near TDC, and was bonked by one of the intake valves to push it back down a bit. (with very little resistance, as no rod) -No rod left to push it back up, so stayed there and no further damage to #2 valves or head. -The debris that entered cylinder 4 got conked between the piston and the head. Luckily, the piston material took the brunt of it, and it buried mostly into the piston rather than into the head. -Small dent left in the head on cyl 4, straight looking valves everywhere. But will do a leak test on all of them. As possible damage on cyl 2 valves. Project smallblock still looks good to go, so long as I can find all of the 2NZ related bits! The cams are 100% fine, and the head looks 99% fine. I'll give it a good clean out to make sure no debris entered the oil passages. But no evidence of that which I can see. Probably because one of the main oil supply galleries was busted by the conrod, around about the same time as the oil filter said Bon Voyage. Piston #4 close up: Small dent on the head. Will smooth the edges so it wont cause knock. Feeling pretty lucky! 25 2 Quote Link to comment Share on other sites More sharing options...
kpr Posted June 21, 2022 Share Posted June 21, 2022 impressive so little damage to head. keen to see how the 1.3 goes Quote Link to comment Share on other sites More sharing options...
Popular Post keltik Posted June 21, 2022 Popular Post Share Posted June 21, 2022 I like the thought someone is going to find an oil filter housing lying in the road and try to piece together wtf happened. 10 Quote Link to comment Share on other sites More sharing options...
h4nd Posted June 22, 2022 Share Posted June 22, 2022 On 14/06/2022 at 18:55, Roman said: Not quite sure what's gonna happen from here as I'm fairly financially steamed until probably end of year at least. On 15/06/2022 at 06:18, Muncie said: Setup a give a little page I'd definitely throw some coin your way to see one of my favourite builds not stall. On 15/06/2022 at 12:25, Stu said: Same, happily throw in a fiddy to see another block put in this thing asap 1 Quote Link to comment Share on other sites More sharing options...
Popular Post Roman Posted June 22, 2022 Author Popular Post Share Posted June 22, 2022 Thanks to everyone that has offered. I'm obviously not above accepting charity, as I've been on the receiving end of an incredible amount of it to get this far with things. it's very humbling that anyone would want to help pay for another engine. However I'll be happy to play around with the 1300cc setup for a while. I found all of the 2NZ motor parts needed, I thought I might have thrown some of them out. It looks like all I need is the right length PK belt to suit the addition of the mechanical water pump. Then it'll be good to go once I've swapped the flywheel and clutch over. I havent pulled the old block and the gearbox out yet, but it's not too much work left. The intake manifold has no issues with having the alternator in the high mounted position. The dipstick very nearly fits in the correct spot too. But not quite. I've taken out my VVTI travel stopper, and set the cam to the proper position instead of 1 tooth back. I have confirmed that with the cam in the correct place there are no piston / valve issues. One benefit of the 1300 motor is that there's a little bit more room for the intake, as the block is shorter. So it all sits lower in the engine bay. Looking forward to it! 21 3 Quote Link to comment Share on other sites More sharing options...
cletus Posted June 22, 2022 Share Posted June 22, 2022 Are your header pipes the right size or do they need to be bigger? Looks like the design isn't too bad, you might be able to chop off the crappy factory collector and do a better one while the engine is out? 3 Quote Link to comment Share on other sites More sharing options...
Spencer Posted June 22, 2022 Share Posted June 22, 2022 I think somewhere in the thread there is mention of ebay headers? but needs the exhaust changed to 3" so waiting on that. I would also send some corn for a new block, since this is the best build thread on oldschool etc. 7 Quote Link to comment Share on other sites More sharing options...
Mop Head Posted June 22, 2022 Share Posted June 22, 2022 @Roman stop trying to be humble and take our dang money. 2 Quote Link to comment Share on other sites More sharing options...
ThePog Posted June 22, 2022 Share Posted June 22, 2022 We will sort it once the 1.3 throws a rod doing a 12 second pass at 13800 revs. 6 2 Quote Link to comment Share on other sites More sharing options...
Roman Posted June 22, 2022 Author Share Posted June 22, 2022 Haha, done deal. 2 Quote Link to comment Share on other sites More sharing options...
Roman Posted June 22, 2022 Author Share Posted June 22, 2022 Yeah I've got the ebay headers here but they were gross. Larger diameter runners but didnt make any difference, and had other issues such as leaking from everywhere possible. Touching the gearbox cables. Rigid mounting the flexi join via stupid design. I dont have any welding skills or equipment so V1.0 of the exhaust will definitely just be from those standard extractors back. Ideally would be much longer length, but the diameter of the standard ones are fine for the port size. Quote Link to comment Share on other sites More sharing options...
GARDRB Posted June 22, 2022 Share Posted June 22, 2022 2 hours ago, Mop Head said: @Roman stop trying to be humble and take our dang money. I'd say if it were publicised, say on YouTube he might end up with more money than he needs Quote Link to comment Share on other sites More sharing options...
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