What does it weigh?
Posted 06 November 2017 - 09:43 PM
On the LS the clutch, pressure plate and flywheel are 40lbs give or take a few, so from 371 that takes you up to 411, add the accessory drive and your at 436, headers and intake are going to add another 20-30lbs voila you're at 456. I'm sure there are also some miscellaneous bits as well that add a few pounds. You could probably find a lighter flywheel and other bits to bring the weight down so possibly as light as 435-440lbs. The other factor people forget about the transmission; an LS trans is 125lbs. So the combination is very near 600lbs.
Ford 5.0 motors are very compact and with aluminum heads, manifold and other bitsI've seen actual weights at 424lbs. The T5 is around 75-80lbs. A lot of British car guys use the combo because even at 500lbs it's still 50-80lbs lighter than the stock 4 cylinder motor.
For comparison I weighed my A12 with all the accessories clutch and even oil. The headers and flat slide carbs took a bunch of weight off the motor so it came in at 183lbs. The 56 series 4 speed is 38lbs, so all up is 221lbs The A15 is 195lbs combined with the 60 series box the total package is 253lbs. This combo is making around 105-110hp and will finally out drag a stock Miata. Now as sad as that sounds remember that a stock Miata will out drag a stock 240Z.
Now for a street car the weight doesn't matter; were talking 250-300lb difference between a race prepped A-series to a V8. The difference from an L16-L20 & 5 speed combo is going to be as little as 125 and as much as 200lbs.
My fabricator pal has changed my thought process; a KA24 as the pictures above demonstrate is all of 50lbs lighter than a 5.0 and 100-150lbs of an LS motor & tranny install. This is true of most 4 cylinder motors. Add in turbos and there is no weight savings.
A standard KA is going to make around 130whp versus 250-400 for the stock V8s. Now I don't particularly like the exhaust note of American V8s but from a power standpoint they make sense.
Datsuns are light so they don't need much to make them scoot. Also once you get them up to 175whp they start to go well (read out drag a modern Camry) At 200whp you could manage some 1/4 mile times in the 13s. Datsuns are also about handling but alas they have a really narrow track (most 70s cars do) and so that driver in that shiny new 3800lb Mustang or Camaro will leave you behind in the twisty bits if they're the least bit confident. I'm driving the wheels of the 1200 but turn the same exact lap times in students 911s & Z06 Vettes while driving the whole course in 3rd gear.
So my usual short story long point is put in whatever motor makes you happy and don't worry about the weight. If the weight bothers you than stop eating Bonbons & buckets of ice cream, load on brain before you go to the drag strip and have your girlfriend drive (let's face it she looks better behind the wheel anyway)
Now with that said keep the weights coming as it makes for some interesting reading
Posted 09 November 2017 - 09:24 AM
I dong have any consistant weight data on a RX7 13B rotary, but it is an amazing engine in a light car or truck.
Design wise I'm still in awe over it: 3 moving parts, oil supply uncontaminated, no valve adjustments, Compact size, over 100hp high revving fun.
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Posted 09 November 2017 - 06:32 PM
But yeah, they are neat. I have a 12A in my garage
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Posted 10 November 2017 - 09:36 AM
Rotary engines are basically an air compressor. The more you can get into it, the more power it makes.
I guess all engines are like that, but rotaries have less moving parts, less drag and parasitic loss. A great idea, but yes...ultimately a dead end.
Posted 10 November 2017 - 09:54 AM
Posted 10 November 2017 - 09:48 PM
You can milk about 22-25 mpg out of a rotary car but the instant you start revving them it quickly descend in to the 4-7 mpg zone.
As for burning oil my street B210 was burning a quart of oil a week.
As for weight I seem to recall an all up 12A being around the 260-280 mark. As for turbo rotary motors; there was a thread on the Grassroots Motorsports forum where someone swapped a V8 in place of the turbo rotary and the V8 powered car was lighter.