Part 12: 13B Rotary Engine Rebuild - My 76 Mazda RX-5 Cosmo Restoration
Just as I promised last episode, it is finally time to build the engine!
Part 12 of my RX-5 Cosmo restoration covers the entire process of building
the 6 port 13B Mazda rotary engine. While this engine is a hybrid of GSL-SE
RX-7 and Cosmo parts, the process is the same for any rotary from a 12A to
a 13B NA, 13B turbo, 13B-REW or any
other variant of the 13B. This video shows the whole process of the engine
build, starting from measuring the rotors and covering everything else
including clearancing the side seals, assembling the rotors, complete
assembly the short block, setting the eccentric shaft end play and
installing the front cover and everything underneath it. It's probably the
most complete engine build video outside of what you can buy from the
vendors, and as such, is an hour long. After this one, I'm going back to
videos under 20 minutes. But for now, grab a beverage of your choice, sit
back, and enjoy.
Rocky the double banger
OL mate charlie doin a meaty as 3rd gear liney in rusty at the 4 and Rota
show. Still gotta work on those entries if ya want to hit like little
13B PP free rev
Road race injected 13B PP. 315hp at wheels at 10,000rpm (redline), 330hp at
wheels at 10,500rpm.
The stumble just off idle is due to the ECU's lack of resolution.
13B T 323 wagon Night Speed Drag Wars 2011
Un-opened S5 13B import block, Garrett TO4B 60-1 turbo, Link G4 RX ecu, Tremec TKO trans, steel
bell housing, 9in diff, leaf spring and caltrac rear end.
Runs on BP98 pump gas and was driven to the track and back. Street legal.
Andy Duffin Rx7 ITM400 2012 race 2
Race 2 in Andy's FD3S Rx7. Running an intake restricted 12A PP (as per
SS2000 class regulations), EFI Hardware throttle body setup, Link G4 ecu, 6
speed sequential gearbox.
Rotary 20B turbo RX7 - Dyno & track
Built as an all-round event's car, Charles' Mazda RX-7 has undergone
serious chassis and engine changes including a Promaz Automotive
bridge-port 20B rotary engine. Boost
comes from a Garrett turbocharger while
the engine runs on methanol fuel controlled by a MicroTech LT16 computer
and LTC dash logger. Backed by a Jerico 5-speed dogbox, the clutch was
suffering on the Dyno
as the Promaz team got the car ready for Performance Car Mania. [
Get your track gear!
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Performance Car Mania, Winton Motor Raceway, Australia - September 2014
SCREAMING 20B rotary engine dyno ~ JPC
Centreline Suspension's 20B PP rotary engine from their Mazda RX-7 Sports
Sedan circuit racer on the Dyno at JPC.