austinsFD

how much does a 1993-1994 mazda 13b twinturbo rotary engine weigh?

c00lduke

Me and a couple of my skinny bitch *** friends are going to be carring one out of the basement in about a week so i can tell you then.

I think you also might be able to find info on it in the whole v8 vs 13b threads, I know i've seen it.

~Luke

turbojeff

iTrader: (30)

410lbs including turbos and all accesories, PS, AC , airpump etc. IIRC.

bajaman

13B or 13BREW?

BIG difference in weight, the FD engine (13BREW) has all the turbo weight. It DOES weigh in the 400+ pound range.

wickedrx7

iTrader: (14)

How much does just a short block weigh?

David Beale

I picked one up once, then almost fainted. Must be well over 300 lbs. Lifted it over 3' into the back of my SUV.

soru81

Shortblock (flywheel, waterpump, thermostat, pulleys and block) ia about 70kg (around 140lbs). One man can put it out of the car.

XSTransAm

400 lbs? that means that 250 lbs for the ps, ac, turbos ect.... that seems a little on the high end of guessing to me

jimlab

Jeff's not guessing, but I suspect that soru81 is. Just the rotors (9.5 lbs. ea.) and the flywheel (22 lbs.) of a 13B-REW weigh 41 lbs.

BTW, 70 kg would be 154 lbs.

93BlackFD

when i shipped my motor to pineapple racing the second time, it weighed in at 145lbs with a 9.5lb flywheel, just the block/flywheel

jimlab

Substitute a stock flywheel and you're at about 155 lbs., which would support the 70 kg figure. My apologies to soru81 for doubting.

However, the cast iron exhaust and turbo manifolds are extremely heavy. The P/S and A/C, brackets and pulleys weigh about 38.5 lbs., according to the weight reduction matrix posted elsewhere. Add in an alternator (10+ lbs.) and air pump (20 lbs.), the lower and upper intake manifolds coils, rat's nest, a lot of plumbing, motor mounts, MOP, etc. and you could pretty easily come up with another 255 lbs. of weight.

Jeff claims his local truck scales are spot on, and although I like to give him **** about it, I believe his weight is very close. However, the scales have an acceptable error of 0.2% or 2 lbs. per every thousand pounds, and a minimum increment of 20 lbs., so it could be 20 lbs. in either direction, especially since it was in the back of a pickup at the time.

turbojeff

iTrader: (30)

Truck scales RULE!

jimlab

Jeff, here's your vindication, from Mazda's own lips...

Page 10 of the 1993 Mazda RX-7 sales brochure...



The last paragraph on the page reads as follows...

"The net result is a new powerplant, including engine
ancilliaries, exhaust system, and final drive, that is much more
powerful, yet at approximately 320 kg weighs no more than
the previous engine"

Now 320 kg is 704 lbs. (1 kg = 2.2 lbs.), and it just so happens that I know the weights for the rest of the "stuff" mentioned in that paragraph...

Part - Weight (Weighed by)
Final drive (differential) - 77.6 lbs. (Me)
Transmission (5 speed) - 112 lbs. (Me)
Powerplant frame - 22.3 lbs. (Bernd Kluesnener)
Driveshaft - 14 lbs. (Jeff Hoskinson)
Pre-catalytic converter - 22.6 lbs. (Max Cooper)
Catalytic converter - 33.5 lbs. (Gene Felber)
Cat-back exhaust - 33.6 lbs. (Max Cooper)
Total: 315.6 lbs.

704 lbs. - 315.6 lbs. = 388.4 lbs., which with the weight of your pickup included, is probably within the acceptable range of error for the truck scale (415 - 388 = 27 lbs.) you used. Interesting. I think we have as close to an accurate weight for a 13B-REW with all accessories as we're likely to get, short of sitting one on a corner scale.

388.4 lbs.

wickedrx7

iTrader: (14)

Okay Jim so block alone weighs?? 150lbs, is this the concensus?

turbojeff

iTrader: (30)

Sweet! Thanks Jim.

soru81

Yes, I am guessing. I didn't weight it. But one man put the shortblock I described on the back seats of my car, and he wasn't more than 100kg.

yy4u

Jim, are you sure the 320kg includes the PPF?, seems like the extra 22.3lbs would put jeff's weight spot on, and i'm not sure why it would be included

jimlab

No, but it's probably a safe assumption. The brochure says the final drive but does not specify the transmission either. If we take them literally and just subtract the weights of the exhaust system and final drive, then the weight of the engine and accessories is much too high...

Differential - 77.6 lbs.
Pre-catalytic converter - 22.6 lbs.
Catalytic converter - 33.5 lbs.
Cat-back exhaust - 33.6 lbs.
Total: 167.3 lbs.

704 lbs. - 167.3 lbs. = 536.7 lbs.

I assume they meant to say "powertrain" instead of powerplant. Basically, everything between the shocks from front to rear in the picture below...

javielo709

I'm working on my 7th and the freaking engine is kicking my nerves. I do have Carpal Tunel Syndrome and working on the engine without a crane or hoist. I'm lowering the engine between the frint frame and the front suspenssion assembly. Is a pain but, the 13B Turbo is heavier than I thought.