Topic: rev limiter (Read 13764 times)

Joseph Davis · « **Reply #30 on:** April 05, 2009, 11:28:49 PM »

I live in a fairly upscale area, Jon, there are no Subarus here earlier than ~94, and nothing lowrent like a Justy or SVX (checked the resale on those lately?).

Joseph Davis · « **Reply #31 on:** April 06, 2009, 05:25:31 AM »

Funny, KBB doesn't list a price on SVX that breaks $4K. You must live in a very affluent area where old piece of shit automatic transmission Subarus are in high demand, for one to sell for $4-7K. Also, I'm not finding a Justy that breaks $1500. Your economy would have to be booming to sustain such a market. Any luck finding a job?

SirDragsAlot · « **Reply #32 on:** April 07, 2009, 09:17:13 PM »

what i woudnt give to find a mint suby justy, no rust and 5 speed. they rocked

Conceptz-X · « **Reply #33 on:** April 24, 2009, 09:23:20 PM »

My 83 supra saw 8500 a few times

No limiter, just kicked out cam followers.

Yes, every ECM will limit at some point, but if the engine has the capacity to reach it is another story

Kain · « **Reply #34 on:** April 27, 2009, 10:59:01 AM »

if you blo a rear rotor in an rx7, it will rev to the moon.

Conceptz-X · « **Reply #35 on:** April 27, 2009, 08:12:49 PM »

o

Quote from: Kain on April 27, 2009, 10:59:01 AM

if you blo a rear rotor in an rx7, it will rev to the moon.

or till the ignition cannot keep up

Kain · « **Reply #36 on:** May 09, 2009, 01:55:09 PM »

Quote from: Conceptz-X on April 27, 2009, 08:12:49 PM

o
Quote from: Kain on April 27, 2009, 10:59:01 AM
if you blo a rear rotor in an rx7, it will rev to the moon.
or till the ignition cannot keep up

why cant it keep up? it will kep up just fine.

How to kill a Wankel Rotary

ratcityrex · « **Reply #37 on:** May 11, 2009, 11:07:25 AM »

That fucking thing sounds just like my 2stroke weed eater....lol

MantisX · « **Reply #38 on:** May 11, 2009, 11:30:24 AM »

Funny how that works. If they wanted it to actually run for a while it wouldnt have.

DmC · « **Reply #39 on:** May 11, 2009, 02:03:27 PM »

It just shows that reving an engine in nuetral doesn't really hurt them at all. if they had left the radiator cap on it probably would have ran all day at 9k.

Kain · « **Reply #40 on:** May 12, 2009, 02:18:27 AM »

yah, no load plus mucho revs != anything.

usually guys that go anything higher than stock or use a 3rd gen water pump switch to an electrical unit. its better over all as you dont get cavetation past 10k rpms.

patsmx5 · « **Reply #41 on:** May 18, 2009, 07:43:47 PM »

Quote from: DmC on May 11, 2009, 02:03:27 PM

It just shows that reving an engine in nuetral doesn't really hurt them at all.

Conceptz-X · « **Reply #42 on:** May 18, 2009, 09:17:24 PM »

Quote from: DmC on May 11, 2009, 02:03:27 PM

It just shows that reving an engine in nuetral doesn't really hurt them at all.

You going to test that theory that on your shit? I wouldnt

I know when I was working R&D for HTG racing we'd twist crankshafts at the end of a dyno pull when the load releases at 8000+ RPM. Engine would be fine through the pull, but never run the same again till the crank was re-phazed.

dvst8r · « **Reply #43 on:** May 18, 2009, 09:33:46 PM »

Quote from: Conceptz-X on May 18, 2009, 09:17:24 PM

Quote from: DmC on May 11, 2009, 02:03:27 PM
It just shows that reving an engine in nuetral doesn't really hurt them at all.
You going to test that theory that on your shit? I wouldnt

I know when I was working R&D for HTG racing we'd twist crankshafts at the end of a dyno pull when the load releases at 8000+ RPM. Engine would be fine through the pull, but never run the same again till the crank was re-phazed.

Going from high load to no load is not even close to the same as never having a load.

DmC · « **Reply #44 on:** May 19, 2009, 06:10:25 PM »

Quote from: Conceptz-X on May 18, 2009, 09:17:24 PM

Quote from: DmC on May 11, 2009, 02:03:27 PM
It just shows that reving an engine in nuetral doesn't really hurt them at all.
You going to test that theory that on your shit? I wouldnt

I know when I was working R&D for HTG racing we'd twist crankshafts at the end of a dyno pull when the load releases at 8000+ RPM. Engine would be fine through the pull, but never run the same again till the crank was re-phazed.

Yeah I have more then a few times. I never blown up an engine bouncing it of the rev limiter. One time in eastern KY I had my kx125 save my life from falling off a cliff It was a steep trail on a cliff face it had just rained the trail had a switchback going up I bogged the bike down going up it tried to just step off but it was so slick I was sliding backwards toward the edge.

I still had the bike running so with my hand I shifted it into first and ran it wot with me standing beside it and it pulled me up the hill t the next shelf. It took about five minutes to. That was luck and skilz son.

two strokes are awesome.

Conceptz-X · « **Reply #45 on:** May 19, 2009, 08:00:31 PM »

Quote from: dvst8r on May 18, 2009, 09:33:46 PM

Quote from: Conceptz-X on May 18, 2009, 09:17:24 PM
Quote from: DmC on May 11, 2009, 02:03:27 PM
It just shows that reving an engine in nuetral doesn't really hurt them at all.
You going to test that theory that on your shit? I wouldnt

I know when I was working R&D for HTG racing we'd twist crankshafts at the end of a dyno pull when the load releases at 8000+ RPM. Engine would be fine through the pull, but never run the same again till the crank was re-phazed.

Going from high load to no load is not even close to the same as never having a load.

Load was not released until after the ign was killed.

Many cars will live forever against the limiter. thats why its there. But to free rev an engine that has no limiting will self destruct provided it has adequate valve spring pressure to achieve such RPM (floating valves will act as a limiter)

Joseph Davis · « **Reply #46 on:** May 20, 2009, 12:12:18 AM »

Quote from: Conceptz-X on May 18, 2009, 09:17:24 PM

Quote from: DmC on May 11, 2009, 02:03:27 PM
It just shows that reving an engine in nuetral doesn't really hurt them at all.
You going to test that theory that on your shit? I wouldnt

I know when I was working R&D for HTG racing we'd twist crankshafts at the end of a dyno pull when the load releases at 8000+ RPM. Engine would be fine through the pull, but never run the same again till the crank was re-phazed.

You can snap/stretch rods or tweak the crank when you suddenly shut the throttle, too. Thankfully that sort of thing only happens to poorly designed pieces of shit.

I've watched D16A6 live on the revlimiter for years. Literally. There was a mexican't who'd cruise the local strip with his CRX held against the limiter in first gear, that lasted for the year and a half it took him to wad the car up in a ditch.

Conceptz-X · « **Reply #47 on:** May 20, 2009, 09:23:57 PM »

yes, poorly designed, due to the crank being modular in design to accomodate roller bearings. If the crank could be forged in one piece, I believe it would never fail like that. The only time we had that kind of failure was on the dyno, never at the track, well, unless we broke a drive belt and over-revved the piss out of it because the CDI boxes we used had the limiters removed.

Conceptz-X · « **Reply #48 on:** May 20, 2009, 09:28:33 PM »

and 260-280 HP 2-stroke on one liter naturally aspirated is pretty decent

Joseph Davis · « **Reply #49 on:** May 20, 2009, 09:35:22 PM »

400 whp/liter is the barrier that impresses me.

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Author Topic: rev limiter (Read 13764 times)