dat521gatherer Posted October 30, 2008 Report Share Posted October 30, 2008 looky looky what i found. i'm sure some of you have seen worse but it's fair to say this was still running when i removed it a few months ago. smoked like a bitch but ran. i think who ever rebuilt it last didn't do it right. the pistons were wobbling back and forth with my finger. the rings were smoked and the skirt on #3 was in the bottom of the pan in a million pieces. look at those deposits. i had a anti plug fouler on #4. these are ok to put back in right?:rolleyes: Quote Link to comment
fisch Posted October 30, 2008 Report Share Posted October 30, 2008 wow that's messed up! Makes me wonder what is waiting inside mine! Quote Link to comment
datzenmike Posted October 30, 2008 Report Share Posted October 30, 2008 Did you rotate those rings? They shouldn't line up like that. What's the history on that motor? Was it run with a turbo??? Piston to bore clearance for an L20B is 0.010" to 0.018" that's 10 to 18 thou!! You wouldn't feel any slop even without the rings on them. Probably honed a worn out block and used old pistons. Pistons rattled around and broke the skirt. Blow by would erode the piston tops and the heat would fry the rings even more. Quote Link to comment
ppeters914 Posted October 30, 2008 Report Share Posted October 30, 2008 these are ok to put back in right?:rolleyes: Sure. Buff 'em up, slap in a new set of rings and call it good! :lol: Quote Link to comment
Pacific coast Datsun Posted October 30, 2008 Report Share Posted October 30, 2008 I see a few chunks missing ;) amazing that she still ran. Gotta love the L motors! Quote Link to comment
]2eDeYe Posted October 30, 2008 Report Share Posted October 30, 2008 Looks like the last 2 motors I murdered :D Quote Link to comment
420n620 Posted October 30, 2008 Report Share Posted October 30, 2008 you could always clean them up and use them as Xmas presents like maybe a ash tray or paper weights , door stops, fishing weights and so on and so on. you get my drift :lol: Quote Link to comment
moparvwfreak Posted October 30, 2008 Report Share Posted October 30, 2008 that scares me now. i DONT want ot break into the 16. i am tempted to say screw everythign adn figure out how to do an SR20det swap. witha 5spd of course. DAMNIT! why did i open this thread!!!!!????? Quote Link to comment
bonvo Posted October 30, 2008 Report Share Posted October 30, 2008 i know whats waiting in my motor exactly what nissan put there :D its never been opened:P Quote Link to comment
Bugeye Posted October 30, 2008 Report Share Posted October 30, 2008 i know whats waiting in my motor exactly what nissan put there :D its never been opened:P neither has mine, and its got almost 300k on it Quote Link to comment
bonvo Posted October 30, 2008 Report Share Posted October 30, 2008 neither has mine, and its got almost 300k on it mine is only at 139k and im making preperations for a teardown and rebuild the head gasket leaks so i figure while i got it apart lets go balls out Quote Link to comment
dat521gatherer Posted October 30, 2008 Author Report Share Posted October 30, 2008 (edited) this was the engine that came in my 71 521 i bought 2 years ago. considering the block was green i presume it had a rebuild along the way.. yeah i turned the rings around a bit playing a little. well i think i found out why the blow by was coming out of the valve cover like a exhaust pipe. if i didn't have that rubber hose running down under the truck it would have killed me. it's in the scrap pile now. how do i get the rods off the pistons? i dont see any snap rings or keepers or anything. they look pressed. ok i see it now the fsw says to use a anbor press. Edited October 30, 2008 by dat521gatherer Quote Link to comment
]2eDeYe Posted October 30, 2008 Report Share Posted October 30, 2008 They are pressed. The new pistons will come with new wrist pins, they will have to be pressed back on the old rods. I save the old wrist pins for bolt sleeves and spacers n such. Quote Link to comment
jovial_cynic Posted October 30, 2008 Report Share Posted October 30, 2008 I learned so much tearing down and building my LZ2.1. If you're going to do a complete tear down anyway, you may want to consider building a hybrid/frankenmotor. Do some research on the mixing possibilities (via the jason gray engine spec sheets), hunt around on eBay for a good deal on pistons, shop around for a crank... and for a few hundred bucks, you can build an engine to your own specifications. My LZ2.1 was my first engine build, and I've been very happy with it. Quote Link to comment
zed Posted October 31, 2008 Report Share Posted October 31, 2008 (edited) "i had a anti plug fouler on #4" can I ask, what is anti plug fouler? Also, would it not make sense to use flat top pistons in this motor to increase compression ratio? Edited October 31, 2008 by zed Quote Link to comment
]2eDeYe Posted October 31, 2008 Report Share Posted October 31, 2008 Anti plug fouler is basically a spacer for the spark plug. It keeps the electrode out of the oil bath of a combustion chamber when your motor is on it's last legs. If your running one, you better be planning your next motor. ;) They have a tendency to melt with a hotter burning plug. (That was an interesting day on the side of the freeway) Quote Link to comment
zed Posted October 31, 2008 Report Share Posted October 31, 2008 :lol: thankyou. What I like about this site - always a wise crack with the advice! Quote Link to comment
banzai510(hainz) Posted October 31, 2008 Report Share Posted October 31, 2008 Autosport in Seattle does my motors when installing pistons. Heat it up and press it on. as with L16 sometimes its not worth putting flattops on. Esp if there are bigger block to get nearly FREE. But I did get soem flatops for my L16 but ended up putting a L20 U67 head so any comp increase was lost by putting a head with larger cc chambers. But it did have the bigger valves and intake ports compared to a stock L16 210 casting head. Quote Link to comment
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.
Note: Your post will require moderator approval before it will be visible.