**** this sucks. mechanic says there is no problem with it... i guess he didn't push it hard enough to a high rpm... i'm just going to drive it and see what happens and blame his ****en ass when its broken.

 

on the h22 series engines the weak area for high rpm is in the head not the block.
supposedly the stock h22a crank is good for up to 8500 rpm's
the retainers/springs/etc. are in danger in this case

in my lude i can do 69 mph at redline in 2nd gear, so u couldnt have over reved by too much, plus it was a DS so you were slowing down as soon as you released the clutch (engine braking)

are u getting an engine light?
if not than u may have popped a retainer or spring
either way if no light, then its mechanical and the ecu is unaware of the problem, keep it out of VTEC in any case, until you figure out what happened.

easiest thing to do is pop the valve cover and examine the valvetrain...unless your not mechanically motivated

hey dont feel bad, when i was 16 i downshifted my sisters 90si the same way, but nothing broke luckily, thats back when i was new at the whole "stick" thing.


~boomer

 

i'll post some pics soon of the head and stuff.

 

true to a point, but the rod/stroke ratio says you're incorrect about 8500rpm. the cranks are balanced to 10k rpm by Honda... but no one said the bearings will withstand all the lateral forces from rotation. constantly ramming into redline will reduce the life of the motor significantly as the motor is not designed to be revved that high. anyways, the H22 hits peak hp at 6800rpm... so no worries about ever having to reach 8500rpm without significant motor buildup anyways.


besides, redline is set to prevent valve float. that's a given. the peak hp in the H22A comes in at 6800 rpm... this is due to the cam profiles, as the head only breathes efficiently to 6800rpm. higher than that and you get a significant dropoff in power due to breathing difficulties.

 

as i understand it... reving above 6800 is not a "significant dropoff" in power, the power band simply levels off, and the "peak" HP is achieved at 6800. the engine still makes power throughout the entire rpm spectrum... above and below the peak HP.
at rev limit the power should drop "significantly".

as far as rev limiting, the only major danger to doing so, is heat buildup in the head and pistons etc.
since honda achieves max rev control thru the use of a fuel cut-off system. when the engine reaches rev limit you now have a 70 pound crankshaft spinning at a high speed (7800 rpm), and then the ecu cuts the fuel, but the crank is still spinning so its still sucking air, and now you have an excessively lean system that is burning really hot. this sudden increase in heat can cause damage to a number of different engine internals and systems.

if the bearings fail supposedly due to rev-limiting than they were never correctly installed, or more likely incorectly "seated" when the was engine broken in.

correction rephrase:
the h22a crank in most cases, IS safe to 8500 rpm
this includes bearings, and the crank itself


dont forget that no american V8 car companies balance their cranks at the factory, they are only balanced within LIMITS.

~boomer

 

Yeah, try running any American pushrod past even 5000 rpm for long periods of time, and see how long it lasts.

 

Either you arent using a H22 transmission or you are revving to about 9000rpm. Shifting right at 8000 on the tach (about 7600 actual) is right on 60mph in my Prelude. How you managing 69mph?

 

check out the "0-130" video or the "reving to 7800"
i dont redline 2nd in either, but i have done 69 in 2nd gear on occasion, usually 1st is the gear i rev-limit, cause i cant seem to get much launch traction even with 225/50 tires.

from my experience (at least on my engine), the rev limiter seems to fluctuate mildly depending on outside air temps
in cold weather, once in a blue-moon (as in its only happened twice in the past 24,000 miles), and both times it was on the same night...The engine will rev-limit around 6500/6800 which is odd.
i attribute this anomaly to outside air temperature and bad fuel, engine sounded like shit that night also, so i assume it was detonation, and my knock sensor was kicking down the revlimit and ignition mapping to protect the ole heart.

and on other rare ocassions the rev limiter will jump up to about 8100.

i am running a h23a1 tranny, which seems to make me quicker than other VTEC preludes. so hey ill stick with it.

~boomer

 

I don't know about running at the rev limiter all the time. I've never hit it, and I don't intend to. I know my car has one, so I don't need to find out what happens when I hit it. I'll shift before red line, thank you. There's a reason they use the color red and not green.

 

well then again you didnt build your own engine
so i guess its a matter of experience

~boomer