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View Full Version : 9k rev on an sr...?


initial what?
08-02-2005, 08:54 PM
what kind of head work would need to be done for this?
(enter the silverline with that tech article he read)

drft57pro
08-02-2005, 09:03 PM
nice set of cams, ferra valves and dual valve springs w/titanium retainers, ect ect, and a well balanced bottem end :)

_al
08-02-2005, 09:20 PM
The stock bottom end (pistons, rings, and bearings) will take upwards of 10k rpm. You will need to eliminate the hydraulic lash adjusters to be able to run to 9k safely and reliably. Unless you have a huge turbo, revving to 9k on an SR is quite uesless.

silverline
08-02-2005, 09:46 PM
i think its a hint i have drift tengoku and it has prices and parts list for it
ill bring it friday

Sickboy
08-03-2005, 01:46 PM
The stock bottom end (pistons, rings, and bearings) will take upwards of 10k rpm. You will need to eliminate the hydraulic lash adjusters to be able to run to 9k safely and reliably. Unless you have a huge turbo, revving to 9k on an SR is quite uesless.

Ditto. Solid pivot set-up, agressive cams...

Nismo_Freak
08-09-2005, 11:23 PM
Pray to the rocker arm god.

Slideshow240
08-09-2005, 11:26 PM
what classifies as a "huge turbo"?

rage
08-10-2005, 01:14 AM
you may be able to rework a VE head for it.

Slideshow240
08-10-2005, 01:27 AM
your answer to anythign is "VE"...Ksports = nice (rage)

Voodoo
08-10-2005, 07:16 AM
i think its a hint i have drift tengoku and it has prices and parts list for it
ill bring it friday


What Page is that on in the AUG issue?

rage
08-11-2005, 11:25 PM
your answer to anythign is "VE"...Ksports = nice (rage)
finally got it off of the bumpstops? :redspot

Slideshow240
08-12-2005, 01:49 AM
sure thing guy....

silverline
08-12-2005, 08:54 AM
ill try to bring it to the meet

Voodoo
08-12-2005, 08:55 AM
ill try to bring it to the meet


What page is it on man?

Hook a brother up!

top_secret
08-22-2005, 10:02 AM
The stock bottom end (pistons, rings, and bearings) will take upwards of 10k rpm. You will need to eliminate the hydraulic lash adjusters to be able to run to 9k safely and reliably. Unless you have a huge turbo, revving to 9k on an SR is quite uesless.
I'm pretty sure you would throw a stock rod at 10k rpm... just not designed for those kind of speeds. Might not happen right away, but its certianly asknig for big end problems.

_al
08-22-2005, 06:01 PM
I'm pretty sure you would throw a stock rod at 10k rpm... just not designed for those kind of speeds. Might not happen right away, but its certianly asknig for big end problems.

The stock rods, being forged and shotpeened, are not the SR's weakness at 10k RPM. It's the so-so oiling system and a cavitating water pump at those revolutions, most definitely.

Mikespeed95
08-22-2005, 06:33 PM
why do you need 9,000 rpm?

is cole trickle driving your car or something?

Nismo_Freak
08-22-2005, 06:36 PM
The stock rods, being forged and shotpeened, are not the SR's weakness at 10k RPM. It's the so-so oiling system and a cavitating water pump at those revolutions, most definitely.

Disagree, factors of square go against a stock bottom end reaching 9000 RPM's consistantly and reliabily.

top_secret
08-23-2005, 08:37 AM
if you upgraded oil and water pumps, and left the stock rods, the rods would still fail. Nismo freak is right... I don't know the equation or the numbers to plug in, but I do know that piston speed at 9k rpm on an sr20 is insane.

Just keep russ wheeler out of the race and you will be fine.

_al
08-23-2005, 09:10 AM
Disagree, factors of square go against a stock bottom end reaching 9000 RPM's consistantly and reliabily.

And yet I haven't heard of many engines breaking because of rod failure at 9000 rpm. You may be right, but the rods are not the weakest point of an SR engine.

I was getting consultation from Kojima about this many years back. He told me, "it can handle 9000 rpm ... but why would you want to do this?"

Mikespeed95
08-23-2005, 09:24 AM
Just keep russ wheeler out of the race and you will be fine.

change my tires

top_secret
08-23-2005, 09:32 AM
I dunno what the hell for cole, the race is over

top_secret
08-23-2005, 09:36 AM
And yet I haven't heard of many engines breaking because of rod failure at 9000 rpm. You may be right, but the rods are not the weakest point of an SR engine.

I was getting consultation from Kojima about this many years back. He told me, "it can handle 9000 rpm ... but why would you want to do this?"

I know several people that have had real bad rod knock after thinking they could rev that high with RAS and removed rev cuts and had to rebuild the bottom end... the rods on a nissan don't usually fail like they do on some cars (snap! oh no!) but they will deform or scar the bearing and start knocking, and if not repaired, its just as fatal. I have a ca18, not an SR, and I know lots of people that have had big end problems with the ca after revving up to 9k on a stock bottom end... I don't have as many friends with SR's but I do know of a couple that have had rod knock after spending lots of time at 8k rpm or so for extended periods of time....
If I cared enough about reaching 9k rpm safely to post up online and ask what it would take, I'd be rebuilding my bottom end too.

_al
08-23-2005, 11:09 AM
I blew up my Infiniti's SR20 due to rod knock, but it wasn't because of 8000+ rpm.

What's harder on a rod and prove it mathematically:

1) 28psi
2) 9000 rpm

ameenIT
08-23-2005, 11:37 AM
i have gotten rodknock for alot of reasons..

hydrolock
oil starvation
loss of oil viscosity
detonation
:(

top_secret
08-23-2005, 12:01 PM
damn ameen, all at the same time?

You know how to thrash a motor!

ameenIT
08-23-2005, 12:10 PM
no way!!

not at the same time.. it was over a course of time... or should i say 7MGTES.. except the hydrolock.. that was in my Vigor

datboibrad
08-23-2005, 12:41 PM
7mgtes..... the motor God laughed at lol

ameenIT
08-23-2005, 01:24 PM
not only laughed at.. but all the lil angels used it as pottys and wiped their asses with the rod bearings...

it made awesome power though.. but the oiling system and headgasket SUCKED

Sickboy
08-23-2005, 01:31 PM
I blew up my Infiniti's SR20 due to rod knock, but it wasn't because of 8000+ rpm.

What's harder on a rod and prove it mathematically:

1) 28psi
2) 9000 rpm

I'd like to see the timing curve on both.

tommy thompson
08-23-2005, 01:33 PM
if you are REALLY serious about it, want to do it properly, i would say bore it and destroke it. look at the bore and stroke of an SR20, and look at the bore and stroke of a bike. my stock 1000cc kawasaki revved to 13,700rpm. its all in the rod ratio. thats why F1 cars and bikes rev so high. even nascar turns crazy revs. its because they destroke the motors and bore them back out to keep a similar displacement to stock. BTW, this is all just speculation and thinking on my behalf, as i don't want to make up "facts". just an idea. im pretty sure ive seen some jap shops do that stuff in magazines, though.
ronnie

top_secret
08-23-2005, 04:10 PM
yeah you can do that, some dude built a VW vr6 motor and destroked it and it revv'd up to 11,000 rpm (thats the custom AWD golf, it made like 600 hp too, twin turbo I think).

ameenIT
08-23-2005, 04:18 PM
if your talking about the all carbon fiber AWD golf, it had a 5 cylinder audi motor, AWD, twin turbo, 4 fuel pumps, 900hp...

Nismo_Freak
08-23-2005, 05:42 PM
I blew up my Infiniti's SR20 due to rod knock, but it wasn't because of 8000+ rpm.

What's harder on a rod and prove it mathematically:

1) 28psi
2) 9000 rpm

Momentary acceleration for an SR20DET at 9000 RPMs is 50,238 m / sec, gram weight of a forged piston is 334 grams.

2.99401 ( 334g ) = 1 kg
2.99401 ( 50238 m/s ) = 16780 m/s

16780 N of Force = 3,772 Lbf

So in one complete cycle you will see 3772 Lb of force twice. Now factor that into fatigue over time. Also need to factore the constant acceleration and deacceleration load the rod is submitted to. Overall the high compressive load of the combustion seems to be light in relation to the hell the rod sees.

top_secret
08-23-2005, 06:24 PM
if your talking about the all carbon fiber AWD golf, it had a 5 cylinder audi motor, AWD, twin turbo, 4 fuel pumps, 900hp...

oh ok, I wasn't 100% sure... I saw it in sport compact car like 5 years ago. I've seen videos of that shit... I dunno if it needed 11,000 rpm or whatever, but its scary fast.

rage
08-29-2005, 03:05 AM
sr18 or sr16 crank :)
the rod ratio of the sr20 can't sustain 9k reliably. hell, 8500 is pushing it.
higher rpm's are very stressful on an engine.

silverline
08-29-2005, 09:34 AM
its been said... hks springs vlave retainers rocker arms and stopers. your there

rico05
08-31-2005, 10:14 AM
SRs are so cute.



My CA sees 8k+ regularly, and over 9k a few times. No point though.....stock cams and SR T25G, LOL.

Nismo_Freak
08-31-2005, 05:22 PM
SRs are so cute.



My CA sees 8k+ regularly, and over 9k a few times. No point though.....stock cams and SR T25G, LOL.

9k... you are making what... 15whp at that RPM? LOL.

SR's are cute? What about that pipsqueek of a motor you leg hump :ghey

Don't you have some KA's to go strip for upgrade parts :finger22

Nismo_Freak
08-31-2005, 05:23 PM
its been said... hks springs vlave retainers rocker arms and stopers. your there

If by "your there" you are refering to "custom ventilating the block at 9000 RPM" then you are correct sir.