what's your source for those weights?

sorry,
www.turbophile.com

Got some info on the 13b from aviation sites and guru racing.

13b dry, minus starter, water pump, and manifolds. includes Guru racing cro moly flywheel and clutch
84.5kg
add around 6 kg for internal fanned alternator at 65 amps and water pump 4 kgs but still dry no oil and no water thats around
95kgs
which is close to the 225lbs for the older 12a with the cast iron water pump.
If you use alloy housings for Racig beat you can knock off another 16kgs off the engine
79 kgs!!! at almost 3950!!!! big ones
Even so still cheaper all up than works A series from Japan.
That means to do the sums at 79 kgs with race extend port 235 hp
1kg/2.97hp
with max power PP porting at 340hp
1kg/4.3 hp

Ill be happy with 1kg/2.5hp

sourced from
www.Monito.com
http://www.gurumotorsports.com
http://www.matronics.com/rv-list/bunn ... ide/rv/bunny/mazda13b.htm

Man rotors still flirt me

Just found another weight for the Superlight 180sl (basically a mazda 13b with alloy front, middle and rear housings from raing beat) and a 35lb propeller step gear.
at 210 - 35 lb = 175lb

Then 175lb divided by 2.2 = 79 kgs!

confirming my calculations made using the data found earlier.

Add 16kgs to the 79 = 95/96kgs for the normal steel and alloy version of the 13b

It seems the turbo rotaries are the boat anchors which still make small cars 9s cars at the drags but the NA 13b is the lightweight.

The fact is 13b of any sort are rarely used as it makes most non rotary small cars illegal in all club events as well as on the road

Keeping it in Kw/kg that comes out at 253/96 = 2.635 and 175/96 = 1.83.
Rotors have very high mass/output ratios. I still cant stand the noise they make! It makes my blood curdle

The noise is the only reason Ive almost decided on the Fiat TC engine as a cheap oldskool powerup. If only the supertrapp exhausts were improved to shut them up.
I hear the new 13b renesis has solved the noise with the non peripheral exhausts ports and using side ports instead. However we wont be seing these motors on our shores that quickly from jap imports so the only option for me is a muffler thatll make my 1000 look like a maltese terrier aboard a Malibu surfboard
Yep rotors are blood curdlers. You should have listened to my race bridgeport it never gave me that sporty feel on the track, not like a well sorted piston pump does.
However PPs are much smoother but banned in many racing tracks round the globe (hence the popularity of Bridgeports, J and monser ports) The Japanese racing federation put a ban on Peripheral porting since 1972 on all race tracks.
Many dont remember that in 1984 Rotors were banned (funny how they protect holdens in this country!) Alan Moffats rx7 produced 255kw from a NA bridged p 12a in 1983.

Hi D
Just wondering if you could tell me what sort of power a Series 4 injected 13B with an extend port would produce?
Thanks Matty

Couldnt help with figures but I know the series 4 is a 6 port which cant be extend ported like earlier 4 port engines as in the rx5 or rx4 13bs. Max 6 port figures so far have been 160hp which aint much but some have told me that 200 is possible but I dont think it is with such small ports.
You can find the info on some sites.
But the 4 port is the one to go for big power up for little work.

Yeah, sorry matty, I should have mentioned that when I was talkin to ya before...

You're better off getting a RX4 or RX5 13B block, porting it, and then using series 4 injection on it. Or the other option is to use a series 4/5 turbo block and then rebuild it with higher compression rotors out of rx4 or rx5.

Also, if you need anything, I have most of the manifolds and stuff for series 4 injection lying around.

Actually the best rotors are the 9,7/1 from the 89-91 rx7 NA which also are much lighter.
Check out www.mazdatrix.com
Make sure to use the alloy water pump to save about 100kg from the cast iron one