Any one read the tech section where that guy was saying the rotary is realy a 2.6 and the 20B is a 3.6 I didnt get to read the whole thing (wife was buggin me to go) just wanted to see what you thought https://www.nopistons.com/forums/pub...1047683561.gif
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ok that mag. is total crap first of all, second most people don't understand how engine displacement is measured, so they come up with their own ****. It's just like when rotaries drag race they have to race in the 6 cyl class becouse we have baiscally 6 combution areas. I think thats funny, show me a 1.3l 6 cyl. the pistons would be the size of quaters LOL
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Yea thats what he was saying you have to mesure the chambers and sence we have six it makes the displacment more https://www.nopistons.com/forums/pub..._DIR#>/dry.png
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second most people don't understand how engine displacement is measured Care to explain. I at least know what engine goes in what car just not sure on anything else. https://www.nopistons.com/forums/pub...IR#>/wacko.png |
Originally Posted by turbovr6' date='Mar 26 2003, 08:43 PM
1.3l 6 cyl. the pistons would be the size of quaters LOL
mazda's own 1.8 liter v6 in the mx3 |
well displacement is the volume inside the cumbustion chamber. Honestly I grew up old school, so I can't explain it in liters. for example lets say you have a V8 chevy 350 engine. The volume of one combustion chamber with the piston bottomed out is roughly 43.75 cubic inches, multiply that by 8 and you get 350 cubic inches.
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Originally Posted by Apex13B' date='Mar 26 2003, 08:59 PM
how about a Matras 1.5L v12?
mazda's own 1.8 liter v6 in the mx3 |
Originally Posted by turbovr6' date='Mar 26 2003, 09:03 PM
well displacement is the volume inside the cumbustion chamber. Honestly I grew up old school, so I can't explain it in liters. for example lets say you have a V8 chevy 350 engine. The volume of one combustion chamber with the piston bottomed out is roughly 43.75 cubic inches, multiply that by 8 and you get 350 cubic inches.
Displacement in a piston engine is the fluid volume DISPLACED as the piston moves from BDC to TDC. With the way you mentioned, you would have to add the volume of the combustion chamber in the head, the thickness of the head gasket, and any additional volume from the deck of the block down to the piston if it doesn't come flush to the deck or protrude. Assuming a flat top piston of course. If it is a domed piston you would be closer, if it had a dish it would be less accurate. You would get a higher value than true. Measure the volume when the piston is bottomed out and subtract the volume when it is at the top. I'm not sure, but I think the big debate is based on the fact that a piston moves through it's displacement TWICE during each cycle, while a rotary combustion face does just once. Therefore, for us, we get a power stroke each time a combustion face goes past the spark plugs, while the piston approaches the spark plug twice for each time that plug fires. Hence we move twice as much fresh air/fuel mixture into the combustion chamber as a piston engine of the same displacement. I guess in power output method that puts us closer to a two-stroke. If you follow Grand Prix motorcycles or dirt bikes you can see this. A 500 cc two-stroke competes against a 1000 cc four-stroke. |
Originally Posted by TYSON' date='Mar 26 2003, 09:28 PM
Displacement in a piston engine is the fluid volume DISPLACED as the piston moves from BDC to TDC. With the way you mentioned, you would have to add the volume of the combustion chamber in the head, the thickness of the head gasket, and any additional volume from the deck of the block down to the piston if it doesn't come flush to the deck or protrude. Assuming a flat top piston of course. If it is a domed piston you would be closer, if it had a dish it would be less accurate. You would get a higher value than true. Measure the volume when the piston is bottomed out and subtract the volume when it is at the top.
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Hehehe replace SUBTRACT with DIVIDE and away you go. https://www.nopistons.com/forums/pub...#>/biggrin.png
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Thanks guys....then I guess I did know https://www.nopistons.com/forums/pub...>/rolleyes.gif Thats what I figured. Before I fell in love with the sevens I had a thing for 455's in the 76 Trans Am and the 428 in the 69 Mustang Mach1. But....due to high prices and only getting 8 MPG I bought my FD. Thank God I did!! https://www.nopistons.com/forums/pub...DIR#>/wink.png
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Originally Posted by turbovr6' date='Mar 26 2003, 08:03 PM
well displacement is the volume inside the cumbustion chamber. Honestly I grew up old school, so I can't explain it in liters. for example lets say you have a V8 chevy 350 engine. The volume of one combustion chamber with the piston bottomed out is roughly 43.75 cubic inches, multiply that by 8 and you get 350 cubic inches.
I even read this stuff and TRY my best to understand it, and it just won't compile through the mess in my brain:( It sucks. |
Originally Posted by turbovr6' date='Mar 26 2003, 06:03 PM
well displacement is the volume inside the cumbustion chamber. Honestly I grew up old school, so I can't explain it in liters. for example lets say you have a V8 chevy 350 engine. The volume of one combustion chamber with the piston bottomed out is roughly 43.75 cubic inches, multiply that by 8 and you get 350 cubic inches.
but when you do this to a rotary you only measure one "chamber" when ther are really two. that is what i think dave coleman is saying in his article. the rotary is not a 2 stroke. it's a 2.6 liter engine. why bother arguing against this? if i were mazda i would have called it 1.3 liters too. also since there was no conventional way to measure the rotary's displacement mazda conviently decided on one. theie decision was based on bad logic and personal gain. that is all. |
Originally Posted by Joe Flo' date='Mar 26 2003, 10:53 PM
Thanks guys....then I guess I did know https://www.nopistons.com/forums/pub...>/rolleyes.gif Thats what I figured. Before I fell in love with the sevens I had a thing for 455's in the 76 Trans Am and the 428 in the 69 Mustang Mach1. But....due to high prices and only getting 8 MPG I bought my FD. Thank God I did!! https://www.nopistons.com/forums/pub...DIR#>/wink.png
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