TheSamba.com :: View topic

Tue Jan 10, 2012 11:31 am

this is just a heads up.
my thing, 1835 34 ITC's well balanced. will rev freely to 7,000, I thought, no reason to beat on the motor, want some life out of it. I knew my dad had a 5,800rpm rev limit rotor on the shelf, he used it in his vee. I got it from him, put in thing. last night I go to local bar, car ran fine. ready to leave, won't start??????? got a ride home to get my truck and towbar. get up today, start looking for problem, checking all wires and such. then think, " I wonder if?"
swapper rev limit for reg. rotor, car fired right up! so, I guess they can go bad sitting in a bar parking lot, I wasn't hitting the rev limit on my way there or anything. so if you are running one carry a regular one with you just in case.
THOR

Tue Jan 10, 2012 12:15 pm

Have run rev limiting rotors on both my motors for a total of about 15 years and never a problem.... Was probably defective when you put it in... Heat/cooling/condensation probably finally put it out of its misery...

IF I had to carry a spare of everything people suggest I would need a 18wheeler with parts trailer.... Have some faith....

Dale

Tue Jan 10, 2012 2:09 pm

thanks Dale for the positive thoughts, I might have gotten a bad one, I know it sat for a few years. with new (quiet) exaust, it won't rev that high any more, I can get to about 5,500 and it just feels choked off, but it is quiet so I'll live. no need for rev limit any more, the stinger would let it rev, but really loud!!! neighbors happy now

Tue Jan 10, 2012 3:37 pm

My father and I have run em for years and never had a problem. We have a friend, now retired, who used to build a lot of engines and he would install them and would void warrenty on the engines he sold if the owner removed them (don't know how he would know). We have a bunch of them laying around because we always seem to bend the tab to fine tune the rev limit. Can't leave nothing alone. lol.

Tue Jan 10, 2012 9:39 pm

The Bosch rev limiting rotor looks to be a pretty simple device that just uses centrifical force against a spring to short the spark. Guess the spring could break and leave it shorted, but you might want to test it again. The start failure could have been caused by something else that was affected when you changed the rotor. Loose wire? Rotor not seated down all the way? Cap on crooked? Engine was flooded and cleared while you chased the problem??

Think I would test the rotor again to make sure it was the problem, and not something else that could stop you again.

Wed Jan 11, 2012 8:57 am

yes should do that, spring is intact and springs back when pulled out, but another peoblem, could be there. I did flood it when it first wouldn't start, but let it sit overnigt, tryied in am, checked wires, no fire untill rotor change, will put it back in, see what happens

Wed Jan 11, 2012 9:13 am

Maybe you came out of the bar, blew in the state mandated breathalizer and the car wouldn't start? Or the car has a mind of it's own and thought not starting was better than a duce? Just messin with you

Wed Jan 11, 2012 1:14 pm

Thought I would chime in, bought one a few years back and the darn thing breaks up @ about 3000RPMs and it should go to 5000RPMs. Maybe the rotor was in the wrong box or? The thing did not really fit well in the Bosch cap either, as I had to do some shaving to make it fit. Still can't use it :cry:
Oh well.

Mark

Wed Jan 11, 2012 1:33 pm

mcmscott wrote: Maybe you came out of the bar, blew in the state mandated breathalizer and the car wouldn't start? Or the car has a mind of it's own and thought not starting was better than a duce? Just messin with you
the car might have been thinking that, but would not start the next day.
I know your messing with me, but didn't drink that much, went home got in truck, went back and towed my thing home.
rotor has 5800 stamped into bottom side of it. could be old and tired, and just failed

Wed Jan 11, 2012 11:03 pm

hmm stupid question, what are rev limiters for?cant you hear?stab it & pull another gear when it sounds & feals right. works for me.right foot rev limiter.if somethin beraks what diff does it make it's broke, fix it, make it faster.
kinda like the guy with the top fuel bug racin the camarow,gosh darn man I would of waxed your butt if I did not have my gerocery getten revlimiter .and I still need to work out all the bugs &tunafish, I think my sink is off too.

Wed Jan 11, 2012 11:40 pm

Its for instances were you might miss a shift or like in my sand rail you just can't shift fast enough out of first gear, keeps it form OVER REVING.

Thu Jan 12, 2012 9:17 am

mark tucker wrote: hmm stupid question, what are rev limiters for?cant you hear?stab it & pull another gear when it sounds & feals right. works for me.right foot rev limiter.if somethin beraks what diff does it make it's broke, fix it, make it faster.
kinda like the guy with the top fuel bug racin the camarow,gosh darn man I would of waxed your butt if I did not have my gerocery getten revlimiter .and I still need to work out all the bugs &tunafish, I think my sink is off too.
Rev limiter is not there to tell when to shift, if someone takes it to the limiter and THEN shifts, they are retarded, power is lost as soon as the limiter hits. Its a safety device. It really makes ones day when they scatter a 3k trans, and then take out their 6k engine 2 seconds later cuz it went 10000 rpm for a second too long.

Thu Jan 12, 2012 10:06 am

Is there a resistor in the rotor? Stock rotors have resistors under the plug glue on the top and they can go bad. Measure the resistance from the center to the rotor tip.

Steve

Thu Jan 12, 2012 10:07 am

Chip B. wrote: mark tucker wrote: hmm stupid question, what are rev limiters for?cant you hear?stab it & pull another gear when it sounds & feals right. works for me.right foot rev limiter.if somethin beraks what diff does it make it's broke, fix it, make it faster.
kinda like the guy with the top fuel bug racin the camarow,gosh darn man I would of waxed your butt if I did not have my gerocery getten revlimiter .and I still need to work out all the bugs &tunafish, I think my sink is off too.
Rev limiter is not there to tell when to shift, if someone takes it to the limiter and THEN shifts, they are retarded, power is lost as soon as the limiter hits. Its a safety device. It really makes ones day when they scatter a 3k trans, and then take out their 6k engine 2 seconds later cuz it went 10000 rpm for a second too long.

Not always so.....

If you go to auto cross races you will hear most any car equipped with "rev limiter's" hitting them quite a bit.... On some medium length courses sometimes its easier to bump against rev limiter for a very short distance rather then have to shift up a gear and no sooner than you let clutch out you have to shift down a gear.... Actual for the few second spent at max rev (against limiter) will give you faster lap time than time lost having to shift.... Also there is the issue of handling steering wheel and you don't always have a hand free for gear shift.... I run against a 7200 rpm limiter and I know I run out of torque at a lower rpm but its the RPM that carries the car through the point to up/down shift for those few seconds... You will even hear top (fasted) cars with unleashed ECU against rev limiters at times and they are turning fastest times of the day....

Rev-Limiters are primarily just that... A limiter.... How its used depends on what you expect it to do.... For me 7200 RPM seems a safe maximum for my engine build and on most courses I rarely ever bump against it... And rarely get out of second gear ...

Dale

Thu Jan 12, 2012 10:12 am

Steve Arndt wrote: Is there a resistor in the rotor? Stock rotors have resistors under the plug glue on the top and they can go bad. Measure the resistance from the center to the rotor tip.

Steve

YES there IS a resistor in them.....

Dale

Thu Jan 12, 2012 5:48 pm

mark tucker wrote: hmm stupid question, what are rev limiters for?cant you hear?stab it & pull another gear when it sounds & feals right. works for me.right foot rev limiter.if somethin beraks what diff does it make it's broke, fix it, make it faster.
kinda like the guy with the top fuel bug racin the camarow,gosh darn man I would of waxed your butt if I did not have my gerocery getten revlimiter .and I still need to work out all the bugs &tunafish, I think my sink is off too.
One would have helped a couple years ago when my throttle got stuck.I had to push in clutch to slow it down then pop it back out then shit it off.As to why didnt i just turn it off i was 3rd gear wide open in the dunes coming to part where i had to brake hard then drop down not enough time to reach and shut off motor.'

At least i have good parts inside motor so nothing decided to take a peek outside the case. :D Wedgmate took care of the f/w