Attachment 468808
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Honda NR750 oval piston
Quote:
Originally Posted by Robby321
Attachment 468812
I wonder what kind of boring/honing machine they used.Quote:
Originally Posted by Robby321
Got picture of the boring bar for that slug?:DQuote:
Originally Posted by Robby321
3 rings per piston means rough sealing surface used?
2 compression rings and 1 oil scraper is pretty typical for a 4-stroke.
NR500 .. they named that one right … still "Not Ready" after 30+ years … :o
https://www.screamandfly.com/attachm...2&d=1593838824
https://www.screamandfly.com/images/misc/quote_icon.png Originally Posted by Capt.Insane-o https://www.screamandfly.com/images/...post-right.png
My father was an apprentice at Grey Iron when the 396 was being developed as a "marine motor" sh*t in the valve train doesn't even point in the right direction, how that pile of junk became ballyhoooed as one of the greatest motors of all time is way beyond me.
Fugimotosan says :
...so true. as you know, they morphed into the 427, 454, & so on, over the years. you would have thought GM could have fixed all those decades of bad valvetrain production. nope! as they came from GM, a large percentage failed. particularly the ones that were marinized by marine engine suppliers in stock form. it was up to the customer to spend the bigger dollars to upgrade with an aftermarket valvetrain. ridiculous. sustained 5,000 rpm? hell no.
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The simple answer is :
If they put the valves inline .. it would just be another small port, small valve motor that runs 1/3rd of the valve up against the chamber and cylinder wall... you know, like a .. 383 / 440 NoPar .. :D
Common sense dictates :
Going with the "Porcupine" head , the valve moves away from the wall as it opens and closes . Splaying the valves also allows the ports to be much bigger with a better line of sight entry .. ;)
She's so fine, my 409 :
The valve angle , rocker arm and push rod all run on the same plane . The only change of direction is at the lifter / pushrod junction . The only people I know that had problems had the wrong length pushrods in place or had sacked out valve springs . The rocker needs to seat on the outer 1/3 rd of the valve stem . Then sweeping to the inner 1/3rd at full lift , then back again as it closes .
Pre Limiter :
Being that they would rev freely from the airflow capacity .. it's easy to over rev the motor and hurt parts . Not the motors fault … is it .. :cool:
I've had short stroke Big blocks that would go 9000 .. and hurt nothing .. :smiletest:
The 500" Pro / Stock guys run them up in the 11,000 rpm range ..pass after pass ;)
It's not 1965 anymore …. :D
They are popular because :
They came with steel cranks from the factory. 4 bolt blocks. 6 bolt heads. 4.840 bore space . Rocker pedestals are also 4.840 apart .. simple . The same basic 396 platform goes to 632 cubic inch's . And up to 1000 + ci in todays world of CNC machining . Did I mention airflow … :cheers:
Chaz= thinkin, Dick Keinath has passed on , but his design will live on way past any of us …
http://st.hotrod.com/uploads/sites/2...singray-13.jpg
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Same thing works for the canted valve Ford Cleveland small block.
I almost posted something about seeing the Gapp + Roush "Tijuana Taxi" run at Miami~Hollywood and Gainesville … :thumbsup:Quote:
Originally Posted by Da Bull
https://2.bp.blogspot.com/-n2s2x2H51...640/taxi_1.jpg
Smokey told Chevrolet in the early 1950's that the "new" smallblock head was too short to get the ports up high enough to get the short turn radius big enough to , make the turn , straighten the flow .. and use the whole valves circumference . They didn't listen to him , but Richard Maskins sure did .. :smiletest:
http://www.besracing.com/images/mana...E-HEAD-004.jpg
https://tse3.mm.bing.net/th?id=OIP.0...=0&w=272&h=182
Get away from that wall … :D
https://i0.wp.com/hotrodenginetech.c...chief-3_lg.jpg
CNC done.Quote:
Originally Posted by Da Bull
Watched this a while ago...he is a modest genius.
https://www.youtube.com/watch?v=AV1vb9MZnrI
...very familiar & a great design. and in stock factory form, had no rocker/valvetrain issues like the bbc.Quote:
Originally Posted by Da Bull
...again, very familiar with the porcupine/canted valve design chaz. i was in warranty for decades with these engines in ''stock" factory versions. too many warranty replacement units to count. i have hi-performance bbc experience as well, which is not what i was referencing.Quote:
Originally Posted by Chaz
Never got into big blocks even though they made them in my town of Tonawanda I believe it was called the Mark IV line, 50 years... no more.
I had a 64 Vette 327 with a few extra parts that would beat any big block around If I raced from a press, about died in it racing a new 440 Cuda this was 1971, going over a R/R crossing, while driving me to the Hospital the 440 6 pack Cuda owner could not believe he was getting beat by a 327, power to weight ratio and a motor that could breath real well.
Small blocks sing high notes:D
j
I had a 64 Vette 327 with a few extra parts that would beat any big block around If I raced from a press, about died in it racing a new 440 Cuda this was 1971, going over a R/R crossing, while driving me to the Hospital the 440 6 pack Cuda owner could not believe he was getting beat by a 327, power to weight ratio and a motor that could breath real well.
Ok, who won, you or the Cuda??? And if you are a Chevy guy, why are you called Cuda???
j[/QUOTE]
back in the late sixties/early seventies, the factory big block cars(no matter which one you choose of the big three) could not get any traction. for acceleration OR handling. those goodyear polyglas gt's didn't stand a chance, lol. or the firestone wide-ovals. they just sat there and sizzled.:smiletest:
I thought I covered that :Quote:
Originally Posted by FUJIMO
Pre Limiter ::cool:
Being that they would rev freely from the airflow capacity .. it's easy to over rev the motor and hurt parts . Not the motors fault … is it ..
Didn't all those boats come with BBC's .. maybe a few had SBC's in the 26 or maybe 28 Cig's .. But for the most part , rat motors .. that means you get the majority of drivers , both good wheel men .. and strokes . My money is on you replaced motors for guys with more dollars than cents .. err .. sense .
My personal opinion , boat motors are meant for boats , and car motors belong in cars .
If your going to run a free breathing big inch motor with no limiter and sail it thru the air with the props out of the water .. it's no different than putting a car in and out of neutral at 100 mph … with your foot on the floor .. ;)
In the early 90's I use to go down to Blue Thunder and buy up .. blown up 509 and 540 inch motors . I wasn't going to tell them that 3/8" valve stems , 3/8's pushrods and 125 pounds on the seat was meant for roofing trucks , not Hi-Perf boats.
Scored cyl wall , didn't matter .. boring it to 4.600 as soon as it got home . Them boat anchor ( no pun ) heads either went in the scrap pile or out the back of the truck and over the bridge .. on the way home .. KaaaSplooossshhh .. :o
Dart 360's would make just shy of 1000 HP with a .780 lift roller and 300 on the seat . The boating industry supported more drag strips than you'll ever know .. :thumbsup:
I love this thread , don't want to see it ruined by words . Please carry on .. :cheers:
Mid-Life .. He's an honest man as well . I went up to the Dart booth at the PRI show, a kid said , can I help you ? I hope so , I rung the bell at a few races this year , sent in the proper paper work and your one of three dead-beat company's that haven't sent me my money yet .. Dick walked over and said , I'm very sorry sir , I'll personally take care of this next week when I get home . I shook his hand , thanked him .. and he was a man of his word . $300 for heads and $300 for intake manifold. For each race win . And $150 / $150 for each runner-up .. One lump sum check .
I had one Brodex block and one Donovan .. but both those motors had Dart heads on them .. :)
Cuder .. you forgot about the $100 dollar bill taped to the dash board story .. and wheelies in third gear on a dirt road … maybe those are for another time .. :D
http://racersreunion.com/gallery/ima...af321355593265
Back in high school buddy got a 67 maybe 68 ss camaro 396 and it was brand new we got into a race with a 396 el camino he lost it no traction and we hit a telephone pole. No traction at all I think the car had less then a hundred miles on it. Red with a black and white checkerboard top and seats.Quote:
Originally Posted by FUJIMO
I did't know they put big blocks in the early Camaro's I knew of a 1970 with one, my uncle bought a 67 with a 327, that car was never outside, Sunday / summer car, when he died one of his grand kids got it and drove it in western NY winters, turned to trash.
The Cuda name, my mother was a well know competive swimmer so I swam and was tall and thin hence the barracuda nick name, before I could drive I fell in love with the early Barracuda you know the Valiant conversion :rolleyes: at the Niagara drag strip those little V8s kicked a$$
good power to weight ratio I guess, very light, I got my sister to buy a 340 Duster in 1970, she just got out of nursing school living at home, I had my own set of keys, she worked nights soo I had fun with it, when I was 17 a friends older brother asked If I would help him rebuild a 1964 327 Vette, not long after the rebuild he said you really like this car huh, He bought a 67 Corvette Coupe factory sidepipes I got the 64 convertible with hard top.
Umm, you never heard of 396SS or ZL1 Camaros in 69? .. just teasing, but are you still celebrating July 4th?
Cuda first year of the ss396 camaro was 67
American Muscle 440 Chrysler engine and chassis, with Italian style craftsmanship, and 4 wheel disc brakes to stop.
That is why Jay Leno loves his 1970 Monteverdi 375 S.
Attachment 468861
I see 12,900 SS396 made in 1967, everyone I knew back then ran Chevelle's with big blocks, I have a 496 in the back of my 6.6 durmax van right now:D It's a replacement motor for a C7500.
I did buy a 1969 427 tri power Vette ... with out a motor and screwed it up replacing it with a 289 high cam race motor that belonged in a light weigh car, poor match I was 19 at the time. Had a nice factory hood.
Damn the days of massive suspension (6 front 3 rear maybe) a super power band (like off, idle and WOT) but had a ball with it dirt and ice! 74 Honda CR250.Quote:
Originally Posted by Chaz
Attachment 468927
Attachment 468932
My GOD, some people are SO stupid! Check this vid...
https://www.facebook.com/robby.gartn...9269014495332/
...your supposed to lower the trailer first, duh....you do that by letting air out of the van's tires.Quote:
Originally Posted by Robby321
The wheel goes around around,around and around.hahaha what a dumb ass.Quote:
Originally Posted by Robby321
Lake X..... my whish car.... 450 hai…...or 2300 ghia…...Ya...… used to peddel my young body up to a place in upper I forgot the name....Brook haven?...… and Drool over the old Ferries/ massaraties…...and Lambo....Jarmmas….and cheep me didn't buy one....Instead....An Osca fiat 1600 allamano 007# 2 in the USA.....Then the Damliel SP 250.... I learnt to drive.... when mom wount give me the keys to the wag.... 1966....caprice...Mom … wouldn't let me bring home a new car.... from the junk yard.....Put $10 down...…$200.....1956 pontinksannn suraffari wagons same as nomad......went to Elengish towon about 1988.... my choice......3500...56 nomade…..or.... Nascar….merc...tallagader… long nose.... which wone? My wife rembers the ride over the Big bridge......with lockn up breaks.... from a car bought from E town.....Me ? I was drivin the Daytona......
Please guys, be nice. That poor man is somebodies congressman...Quote:
Originally Posted by Robby321
Is that the Monitor or the Merrimack? Lol
Canal Cops
Lmao. I needed that rite now. HahahahaQuote:
Originally Posted by Robby321
By Jove .. I believe they found ole~Nessy girl .. :eek:Quote:
Originally Posted by AZMIDLYF
https://static.businessinsider.com/i...60cb/image.jpg
The USCG cutter Dallas .. better run for her life before she's torpedoed with multiple 40 kilo bundle's … :D
http://coastguardnews.com/wp-content...spssDallas.jpg
http://snagfilms-a.akamaihd.net/6c/2...g-drug-bustjpg
My new .. _ PRESENT Ppppfftttttttt .. :D
http://4.bp.blogspot.com/-RQZYvxQaF9...0/drug+sub.jpg
Just had completely new interior done … MINT :thumbsup:
https://tse3.mm.bing.net/th?id=OIP.Z...=0&w=239&h=192