Engine issues...

purplecatty said:
Yes, rotary engine is sturdy. That's why it can tolerate high rpm than conventional piston engine. Mazda RX7 and RX8 involves race and driver let engine go redline often on 1st and 2nd gear :lol: Rotary engine was also popular for now defunct Gocart ride (along with arcade games) back in 1980's cuz it is easy to maintain and lasts long. I rode on rotary powered gocart and it was smooth and responsive.

Catty
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Yeah, I'm not surprised about that. I think what killed the rotary engine is that they eat oil and spew more emissions than a piston engine.
 
The Highlander said:
VW designed DCT then most companies copy it if I am correct. The 6 speeds DSG(Direct-shift gearbox) as dual clutch transmission is 30LB lighter than 4 speeds automatic transmission

Ford launching dual-clutch transmission in U.S. in 2010

Yep, My courses don't have DCT yet. Just learned how it work at manual transmission course but no lab. Oh well.
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Automakers copy VW designed DCT? I dont know. Ford launch DCT trannies in 2010? Oh wtf.
 
sequoias said:
Yeah, I'm not surprised about that. I think what killed the rotary engine is that they eat oil and spew more emissions than a piston engine.
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Agree w/ you and Catty. Hey, I'm surprised you know about the Mazda's bad emission. Yes, the older rotary powered Mazda engines are known for the worst emission during cold start and take a lot of time to warm up. I inserted a sniff probe into the tailpipe, saw the HC reading elevate much as over 2000 ppm (part per mile) during warm up at idle then drop to about 500 ppm after warmed up. I think it was in 1998 where I tested on a 1985ish Mazda RX? at Mobil gas station. Today, I see no old Mazda RXs here anymore. I recently smogged a 2005 RX7 or RX8 (I cant recall), easy passed a smog test. Dst
 
purplecatty said:
I bet this prevent engine from throwing out pistons while redline while parking.

Seriously, a friend of my brother's was messing with Hot Rod with 600hp engine, He was stupid enough to floor the throttle and let the engine go redlined and in 3 seconds. Engine blew up and piston ripped through firewall of car and it went deadly close to his face thus shattering his glasses. He was soo SCARED :eek3: It was back then nearly 30 years ago. My brother told me serious story and warned me not to floor the car while it's parked.

As for Honda or any 4 cylinders car, I doubt it'll blow the engine, but would damage valve, timing chain ect if go redlined too long while parked. Unless you experiment Honda with NOS turned on while parked :eek2:

Make sense?

Catty
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I've not see any the piston(s) throw out of the Honda block in my life as I wish I see a real live of the piston throw out.
Well, IF you stage a Honda engine to reach or pass the redline mark for long time when the the transmission is in park or neutral then the valves will be like a floating and can hit the piston(s) or hit other valve sides that will damage the pistons and block/head. Connecting rod throw out??? I dont know.
The valve float is the valve is not staying seated at very high rev, cuz the valve springs are fatigued and suffered in long high rpm run, sound like the valve spring's limit speed. Want longer high rev? Change high rev valve springs (stiff springs).
But other than the Honda engines, the engine's connecting rod(s) will throw out when full loaded, WOT or valve(s) drop.
 
purplecatty said:
I bet this prevent engine from throwing out pistons while redline while parking.

Seriously, a friend of my brother's was messing with Hot Rod with 600hp engine, He was stupid enough to floor the throttle and let the engine go redlined and in 3 seconds. Engine blew up and piston ripped through firewall of car and it went deadly close to his face thus shattering his glasses. He was soo SCARED :eek3: It was back then nearly 30 years ago. My brother told me serious story and warned me not to floor the car while it's parked.

As for Honda or any 4 cylinders car, I doubt it'll blow the engine, but would damage valve, timing chain ect if go redlined too long while parked. Unless you experiment Honda with NOS turned on while parked :eek2:

Make sense?

Catty
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I bet a friend of your brother's hot rod was cast steel connecting rod.
 
sequoias said:
Wirelessly posted (sent from a smartphone. )

My car wont go over 5200 rpm. The tachometer bounces alittle at the 5200 rpm mark or so. I suspect it is something to do with the vtec not engaging, possible the solenoid or the ecu problems. Any better ideas?

Its 2000 Honda Civic EX.
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I know I am a little late posting on this topic. My car, a Hemi Jeep has a rev-limiter. Whenever it hits just above the redline, it will idle down until I shift into the next gear. It is made that way to prevent damage.

Do Hondas have limiters?
 
TinCanSailor said:
I know I am a little late posting on this topic. My car, a Hemi Jeep has a rev-limiter. Whenever it hits just above the redline, it will idle down until I shift into the next gear. It is made that way to prevent damage.

Do Hondas have limiters?
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Yes to prevent to damage the gears of transmission.
 
TinCanSailor said:
I know I am a little late posting on this topic. My car, a Hemi Jeep has a rev-limiter. Whenever it hits just above the redline, it will idle down until I shift into the next gear. It is made that way to prevent damage.

Do Hondas have limiters?
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Yes, most Hondas in the early 90's and later have rev limiters. When I had a 1987 and 1983 Honda Civic, they didn't have rev limiters. The '00 Civic cuts off fuel at 7000 rpm on mine. The redline mark is 6900 rpm.
 
Who drives a car at the engine's redline anyway?:dunno: I'll leave that to race car drivers.
 
TinCanSailor said:
I know I am a little late posting on this topic. My car, a Hemi Jeep has a rev-limiter. Whenever it hits just above the redline, it will idle down until I shift into the next gear. It is made that way to prevent damage.

Do Hondas have limiters?
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yes for computer controller systems. My old Alfa Romeo GTV doesn't have a rev limiter. I see the tachometer is about 5600 RPM limiter but I can rev the engine up to close 7000 RPM WITH high performance camshafts and stiff valve springs.
 
Wirelessly posted (sent from a smartphone. )

Glenn said:
Who drives a car at the engine's redline anyway?:dunno: I'll leave that to race car drivers.
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Passing cars on a 2 lane roads, merging into a crazy highway, flooring it to avoid accidents, etc.
 
mac86dude said:
Yes to prevent to damage the gears of transmission.
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Actually it is to save the engine, not the transmission. Transmissions can turn over many times faster without damage.

Rev-limiters are needed for people like me. Hemi Jeeps eat 5.0 Mustangs and Chevy Camaros for lunch. Zoom-Zoom! :lol:
 
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