hydraulic lifters maximum rpm? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

VATOCLOWN · 08-06-2011, 01:41 AM

Whats up guys was wondering what the max rpm on the hydraulic lifters are for an sr20det the head is built with inner and outer springs titanium retainers bc stage 2 cams 3 angle valve job and ras. the bottom is forged too. i dont take it over 7300-7400 rpm ever but have the redline set at 7600 rpm i have a power fc so i can change the rev limit was wondering if its safe to take it to 8000 rpm. i want to know from people who have some experience in this. Are the lifters good to that rpm and what about the rocker arms are the good to taht rpm as well? oh i run a t3 50trim right now but am going with gt30gtx or efr 7064 in the future i got tomei 750 inj a snow performance stage 2 meth kit with a 650cc inj and a 255 walbro i also have a bosch 44 pump i can run inlineif i need too.

sorry for the run on, spelling and long post all answers are appreciated

thanks again

Vernal · 08-06-2011, 01:52 AM

With the redline on the oem SR gauges being 7500 I would assume you would be safe going 500rpm more. I would definitely think of replacing them prior if you intend to rev it up that high often rather then for show

mewantkouki · 08-06-2011, 09:26 PM

Bleed them properly and you'll be fine. I bang mine off 8k daily. Super tech single springs / hks step 1's.

s14unimog · 08-07-2011, 11:55 AM

that statement right there has the most influence on the rocker arm failures "known". I'm sure a few of those muddying up the water didn't have completely bled lifters and properly shimmed rocker arms...

I honestly don't have the experience with it. I have my limiter at 7600 and seem to stay off it but another 4-500 is surely more appreciated.

mewantkouki · 08-07-2011, 12:25 PM

If your clearances are correct, and your lifters are properly bled you don't have to worry about anything collapsing. I don't run that rocker arm stopper BS either putting the correct valve spring in a car that sees high rpm is the solution. A properly functioning hydraulic lifter combined with the correct valve spring provides the pressure necessary to prevent the rocker from popping off at high rpm. A weak spring and high rpm with larger camshafts is what causes float. I'm not too sure about earlier sr's and lifter failure but I know s14 sr's use a revised lifter. I've spun 8k on two different engines more times than I can count with no issue. I don't really see the point of revving that that high though. Yes it sounds awesome and hitting the limiter makes the car sound like a machine gun but my car has a noticeable drop in power after 7000rpm with larger cams. (Kevin)

VATOCLOWN · 08-07-2011, 06:21 PM

thanks for all the replys guys

*fliprayzin240sx* · 08-07-2011, 09:29 PM

Better questions are do you really need to rev all the way to 8k? You didnt say if you upgraded the valves too...if you're still running the stock sodium filled valves, you'd still be prone to pull the disappearing valve trick.

R@ddy · 08-07-2011, 09:57 PM

Quote:

Originally Posted by fliprayzin240sx

Better questions are do you really need to rev all the way to 8k? You didnt say if you upgraded the valves too...if you're still running the stock sodium filled valves, you'd still be prone to pull the disappearing valve trick.

what do you mean? ive never heard of this...help lol

codyace · 08-07-2011, 10:02 PM

Quote:

Originally Posted by fliprayzin240sx

Better questions are do you really need to rev all the way to 8k? You didnt say if you upgraded the valves too...if you're still running the stock sodium filled valves, you'd still be prone to pull the disappearing valve trick.

I've been running 8000 rpm now forever, plenty of track time...I think all my valves are still there?

08-06-2011, 01:41 AM	#1
VATOCLOWN Leaky Injector Join Date: Jun 2009 Location: LA Posts: 133 Trader Rating: (3) Feedback Score: 3 reviews	hydraulic lifters maximum rpm? Whats up guys was wondering what the max rpm on the hydraulic lifters are for an sr20det the head is built with inner and outer springs titanium retainers bc stage 2 cams 3 angle valve job and ras. the bottom is forged too. i dont take it over 7300-7400 rpm ever but have the redline set at 7600 rpm i have a power fc so i can change the rev limit was wondering if its safe to take it to 8000 rpm. i want to know from people who have some experience in this. Are the lifters good to that rpm and what about the rocker arms are the good to taht rpm as well? oh i run a t3 50trim right now but am going with gt30gtx or efr 7064 in the future i got tomei 750 inj a snow performance stage 2 meth kit with a 650cc inj and a 255 walbro i also have a bosch 44 pump i can run inlineif i need too. sorry for the run on, spelling and long post all answers are appreciated thanks again

08-07-2011, 11:55 AM	#4
s14unimog Nissanaholic! Join Date: Dec 2003 Location: In a place, near a river, over a lake Age: 38 Posts: 2,415 Trader Rating: (22) Rides Gallery: s14unimog Feedback Score: 22 reviews	that statement right there has the most influence on the rocker arm failures "known". I'm sure a few of those muddying up the water didn't have completely bled lifters and properly shimmed rocker arms... I honestly don't have the experience with it. I have my limiter at 7600 and seem to stay off it but another 4-500 is surely more appreciated. __________________ Fuking ginger bread man stole my wallet... SHIFT*lock_slide to side d3m3rs0n: if i have a baby im naming it Brandons Fault Emerson

08-07-2011, 09:29 PM	#7
fliprayzin240sx Man w/ CTSV & a Car Seat Join Date: Aug 2002 Location: Tampa Posts: 17,998 Trader Rating: (19) Rides Gallery: fliprayzin240sx Feedback Score: 19 reviews	Better questions are do you really need to rev all the way to 8k? You didnt say if you upgraded the valves too...if you're still running the stock sodium filled valves, you'd still be prone to pull the disappearing valve trick. __________________ If you think Zilvia has too many assholes... CLICK HERE!!!

08-06-2011, 01:52 AM	#2
Vernal Zilvia Junkie Join Date: Aug 2006 Location: Burbank, CA Posts: 517 Trader Rating: (0) Feedback Score: 0 reviews	With the redline on the oem SR gauges being 7500 I would assume you would be safe going 500rpm more. I would definitely think of replacing them prior if you intend to rev it up that high often rather then for show

08-06-2011, 09:26 PM	#3
mewantkouki Zilvia FREAK! Join Date: Nov 2007 Location: Orlando, Fl Age: 38 Posts: 1,250 Trader Rating: (36) Feedback Score: 36 reviews	Bleed them properly and you'll be fine. I bang mine off 8k daily. Super tech single springs / hks step 1's.

08-07-2011, 12:25 PM	#5
mewantkouki Zilvia FREAK! Join Date: Nov 2007 Location: Orlando, Fl Age: 38 Posts: 1,250 Trader Rating: (36) Feedback Score: 36 reviews	If your clearances are correct, and your lifters are properly bled you don't have to worry about anything collapsing. I don't run that rocker arm stopper BS either putting the correct valve spring in a car that sees high rpm is the solution. A properly functioning hydraulic lifter combined with the correct valve spring provides the pressure necessary to prevent the rocker from popping off at high rpm. A weak spring and high rpm with larger camshafts is what causes float. I'm not too sure about earlier sr's and lifter failure but I know s14 sr's use a revised lifter. I've spun 8k on two different engines more times than I can count with no issue. I don't really see the point of revving that that high though. Yes it sounds awesome and hitting the limiter makes the car sound like a machine gun but my car has a noticeable drop in power after 7000rpm with larger cams. (Kevin)

08-07-2011, 06:21 PM	#6
VATOCLOWN Leaky Injector Join Date: Jun 2009 Location: LA Posts: 133 Trader Rating: (3) Feedback Score: 3 reviews	thanks for all the replys guys