ToxicCarbon
(New Member)
Thu May 11, 06   8:39 PM
piston power!

ok so i just want to know if my calculations are correct. if an engine is running at 5000 rpms the crankshaft is spinning 300,000 PER HOUR! ok so if the cranks are running at 300k revs per hour does that mean that its turning at 83.3 times PER SECOND???? so in turn the valve would be opening 166.6 time per second???? that just seems AMAZING the engine can do that and still perform with exelent timing plus running all of the other various part of the engine?

SweetNeon
(Black Sunshine)
Thu May 11, 06   9:44 PM
Re: piston power!

fuckin stoner

CamaroZ28
(Competitor)
Thu May 11, 06   10:02 PM
Re: piston power!

If i said yes would you shut up?

Silo55
(Racer)
Fri May 12, 06   11:44 AM
Re: piston power!

Do I dare ask HOW you came up with these...."calculations" ?

buddhakwake
(Black Sunshine)
Sat May 13, 06   9:02 AM
Re: piston power!

Well, using his info, if the crank rotates 5000 times per minute then it must be rotating 83.3 times per second (5000 rpm/60secs per min). Quick check of the Sport Compact Car mag I purchased the other day (was sucked in by the cover story of Tuning Myths Busted Wide Open) reveals the same info from their tech guy. So, that would tend to back up his results.

DBLDREW
(Flagger)
Mon May 15, 06   9:27 AM
Re: piston power!

Yes at 5000 rpm the crank would be spinning at 83.3 rps (revolutions per second) but you made an error with the valves opening at 166.6 times per second. The intake valve(s) will only open during the intake stroke, and likewise the exhaust valve(s) will only open on the exhaust stroke. You have 4 strokes, intake, compression, power, and exhaust. Each individual stroke will be ½ revolution of the crankshaft. So each valve will open every 2 rotations of the crankshaft or 41.65 rps not 166.6.

buddhakwake
(Black Sunshine)
Tue May 16, 06   1:25 PM
Re: piston power!

But that doesn't negate his original point that an automobile engine is an amazing piece of machinery, to be admired and worshipped.

69charger
(New Member)
Fri May 19, 06   4:44 PM
Re: piston power!

yes but man made all of these machines so man should be the one to be worshipped. (thank god for the hemi )

Rx_otary_Se7en
(Black Sunshine)
Fri May 19, 06   8:37 PM
Re: piston power!

Practically every motor since the 70's is a hemi, big deal.

SweetNeon
(Black Sunshine)
Fri May 19, 06   9:03 PM
Re: piston power!

yea like a rotary motor? ya idiot

Rx_otary_Se7en
(Black Sunshine)
Fri May 19, 06   11:42 PM
Re: piston power!

I forgot that you failed English comprehension. Practically means most but not all, hence why I said practically every motor. You get dumber by the minute.

SweetNeon
(Black Sunshine)
Sat May 20, 06   9:16 AM
Re: piston power!

GM makes alot of hemi's also huh ya idiot

Rx_otary_Se7en
(Black Sunshine)
Sat May 20, 06   1:33 PM
Re: piston power!

Theres more than one motor company out there than GM. Pardon me if they are stuck back in 1970 in R&D. Now what about every other manufacturer? I thought so.

SweetNeon
(Black Sunshine)
Sat May 20, 06   3:28 PM
Re: piston power!

Like land rover a huge list of others ya fucking idiot

buddhakwake
(Black Sunshine)
Sun May 21, 06   7:51 AM
Re: piston power!

Personally I prefer to worhsip women (they smell much better, are less hairy, and...well...I'm sure you can guess the rest without my having to get crude).

buddhakwake
(Black Sunshine)
Sun May 21, 06   7:52 AM
Re: piston power!

That's why I don't drive a Land Rover (and because they are too expensive for my poor ass).

Rx_otary_Se7en
(Black Sunshine)
Sun May 21, 06   11:32 AM
Re: piston power!

There are more that do than dont.

DBLDREW
(Flagger)
Mon May 22, 06   1:47 PM
Re: piston power!

Actually your wrong most cars do not use a “true hemi” design like what was used by dodge in the 60s. In fact the new hemi that dodge is selling doesn’t even use a true hemispherical combustion chamber. Now most car manufactures do use sort of a dome shape to the combustion chamber but it isn’t a true hemi.




Rx_otary_Se7en
(Black Sunshine)
Mon May 22, 06   2:39 PM
Re: piston power!

Tomato / tomato.

SweetNeon
(Black Sunshine)
Mon May 22, 06   4:31 PM
Re: piston power!

I'm glad some one else said it, I was starting to feal kind of bad picking on that little kid. Hopefully soon he will realize how much of an idiot he is then he will shut up.

Rx_otary_Se7en
(Black Sunshine)
Tue May 23, 06   10:20 AM
Re: piston power!

It isnt a true hemi, but it is of a hemispherical design.

DBLDREW
(Flagger)
Wed May 24, 06   9:53 AM
Re: piston power!

I’m not arguing that it doesn’t, it does use some of the original hemi design ideas, but it still isn’t a true hemi. The only reason I brought it up was to help illustrate how flawed your statement was “Practically every motor since the 70's is a hemi, big deal.” So when the new hemi isn’t even a hemi just helps show how far off that statement really is.

Rx_otary_Se7en
(Black Sunshine)
Thu May 25, 06   12:16 AM
Re: piston power!

Are they hemispheres or not? Dont give me this "true hemi" crap, is it any form of a hemisphere or not? Im willing to bet it is.

DBLDREW
(Flagger)
Thu May 25, 06   9:53 AM
Re: piston power!

No it is not

The original hemi used an actual hemispherical combustion chamber, as in the dome was an actual ½ circle. It also used inline valves rather then valves that where right next to each other along with having a center sparkplug. I know that the inline valves are a little confusing so let me try to elaborate. In a reg motor the intake valve would be closer to the front of the motor and the exhaust would be closer to the back of the motor. Now if you rotate both the intake and exhaust valves 90 deg so the intake valve is now closer to the center or facing the intake maifold and the exhaust is now on the outside or facing the header that is how the hemi is designed.

So the new hemi does use the inline valve design like the original hemi, it now has 2 center located spark plugs rather then just 1 but it does not have a hemispherical combustion chamber like the original hemi.

Ultimately a true hemispherical combustion chamber really isn’t that big of a deal. There are a lot of problems with having a true hemispherical combustion chamber. The main problem is compression. A true hemispherical combustion chamber is a very large combustion chamber so to raise the compression ratio there would have to be a very large dome to the piston, which would decrease the efficiency of the motor. You would also be limited to just a 2 valve design, trying to make a 4 valve design in a hemi would be a complete nightmare, the valve angle would be so radical I question if it would even be feasible. Now that being said the hemi was a very good design for forced induction motors where a low compression was needed.


SweetNeon
(Black Sunshine)
Thu May 25, 06   12:54 PM
Re: piston power!

HA you got owned even by a ford owner ya idiot

Rx_otary_Se7en
(Black Sunshine)
Thu May 25, 06   10:21 PM
Re: piston power!

Are you calling Ford owners stupid? Just because it isnt a full 1/2 circle doesnt mean that it isnt a hemisphere.

DBLDREW
(Flagger)
Fri May 26, 06   6:57 AM
Re: piston power!

Yes it does. That is exactly what a hemisphere means. Saying otherwise is like saying that a rectangle is the same as a square, or an oval is the same as a circle. All close and resemble the other but not the same.

SweetNeon
(Black Sunshine)
Fri May 26, 06   9:19 PM
Re: piston power!

Your an idiot

seahawksridinlow
(New Member)
Fri May 26, 06   9:24 PM
Re: piston power!

Who cant afford a land rover! they get cheaper by the year. there is like 4 of them at my high school, and two range rovers.



SweetNeon
(Black Sunshine)
Fri May 26, 06   9:27 PM
Re: piston power!

rovers are shit boxes

seahawksridinlow
(New Member)
Fri May 26, 06   9:30 PM
Re: piston power!

Well ya got to admit the vince valli range rovers are nice.


seahawksridinlow
(New Member)
Fri May 26, 06   9:32 PM
Re: piston power!

Even though i would rather have a Hummer or a good old Pickup.

SweetNeon
(Black Sunshine)
Fri May 26, 06   9:34 PM
Re: piston power!

If it doesnt use a motor that was once designed in the 60s and doesnt have shit wireing and leaky lines im sure its very nice

buddhakwake
(Black Sunshine)
Sat May 27, 06   9:38 AM
Re: piston power!

Hate to throw a monkey wrench into this, but a sqaure is a rectanlge by definition. A rectangle is a four sided figure with four equal angles (90 degrees each). A square is a subset of the rectangle with the more specific requirement of four equal length sides in addition to the four equal angles. It's similar to saying that all engines that burn gasoline by means of a combination of compression and spark ignition are IC engines but there are subsets of IC engines defined by the number of cylinders or cycle type (miller or atkinson) or two stroke/four stroke or rotary.

buddhakwake
(Black Sunshine)
Sat May 27, 06   9:40 AM
Re: piston power!

I saw one that was probably close to the toughest vehicle I've ever seen. It was in a police chase in LA a few years back, and it managed to drive without two wheels (that's wheels, not tires) until it hit the dirt median and flipped.

DBLDREW
(Flagger)
Tue May 30, 06   7:51 AM
Re: piston power!

I stand corrected; at least in regards to the rectangle square analogy. I better go to dictionary.com to make sure my oval circle analogy still holds water.

SweetNeon
(Black Sunshine)
Tue May 30, 06   1:12 PM
Re: piston power!

or go look it up in the Idiots dictionary and see what BS you can find. We even have a member of this site who created the Idiots dictionary, maybe that idiot mite help you out with your question if hes not busy pulling radio's out and eating the 2 week old taco's wile smokeing a joint with his homies

buddhakwake
(Black Sunshine)
Fri Jun 2, 06   3:44 PM
Re: piston power!

That one still works. Circles and ovals have their definitions based on foci (that's plural for focus, sweaty neon), and a circle only has one whereas an oval has two.

Racerchic06
(Newbie)
Thu Aug 10, 06   12:30 AM
Re: piston power!

You People Are Wierd And In My Opinion The "True" Hemis Were Back in the 60's So Dont Bring Up Old Shit . The New Ones Aint The Same As The Old Ones, Just Like The New "Fairlane People Mover" Aint The Same As A Good Ole 390 Thats Actually A Car And Not A Fuckin Box

Riceracer
(Flagger)
Wed Oct 25, 06   8:14 PM
Re: piston power!

fuck off sweetneon

69charger
(Professional)
Thu Oct 26, 06   12:28 PM
Re: piston power!

shut the hell up already

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