The last two years, when Glen has finished a motor for me, he has installed it
the car and taken to Phil Babcock in Ft. Myers Beach, FL who has a company
The Dyno Shop. On his Dynojet Model 248C chassis dyno we got the following
results at the rear wheels:
Devin TR3 in April 2000: 130 HP at slightly over 6,000 RPM
Triumph TR3 in June 2001: 121 HP at around 5,500 RPM
Both motors have 87mm pistons, billet crank, carrilo rods, lots of head work,
about 12:1 compression, SU H-6 carbs, stainless headers, and cams from Greg
Solow. The Devin motor had a really nice cam in it but required some head work
after each race weekend (we were running up front with the HSR Porsches!) A
milder cam is in the Triumph TR3 motor.
Are these legal motors? I feel they are and have nothing to hide. How much
money does one spend? My estimation is that a new "Efinger Thunderpower" motor
from scratch with all the goodies and all the tuning work would run about
> Okay, JK and I spent the day at the dyno with the Grassroots Motorsports TR3.
> Remember, this is a near stock engine with the head shaved, a Kastner G3 cam
> a decent valve job and reworked SUs and a header and straight pipe.
> We started the day with 97hp ((4900 rpm) at the rear wheels and ended up with
> 104.5. Torque figures started at around 115 ft-lb. at 4000 rpm and ended at
> JK says we are down nearly 30 hp to the front runners like Mike Jackson and
> Jeff Snook.
> Okay, guys, give it up... what should a well tuned LEGAL TR3/TR4 engine make
> for power, and what type of $$$$$ commitment will it take to get there?
> Tim Suddard/Grassroots Motorsports
> P.S, We are constantly updating our website and making reports in our
> magazine about this ongoing project car. www.GrassrootsMotorsports.com