IMCA updates list of approved ignition boxes, rev limiters
VINTON, Iowa (April 19, 2011) -
Ignition boxes available from four manufacturers will be legal for use
in IMCA Modified and IMCA Late Model divisions this season.
With changes in the rules for 2011, we want to make sure drivers
know what will be rev limiter compatible before they make any
purchases. IMCA Vice President of Operations Brett Root explained.
Its a matter of not only cost but preventing any tech inspection
issues on opening night.
Modified drivers are required to compete with a maximum 7,800 rpm
rev limiter chip, Late Model drivers with a 8,000 rpm maximum chip
Approved ignition boxes and rev limiters for the two divisions
6T Oval Track, p/n 6400 must use plug-in MSD p/n 8738 Soft Touch
6AL, p/n 6420
6ALN, p/n 6430
6HVC. p/n 6601
6HVC, p/n 6631 (Deutsch Plug)
6HVC, p/n 6632 (Deutsch Plug)
Digital 6AL, p/n 6425
Soft Touch Rev-Limiter, p/n 8728 use with GM, Ford, Mopar points,
amplifier, or magnetic pickup distributors/ignitions. 8728-6 w/pigtail
is also legal.
Soft Touch Rev-Limiter, p/n 8738 use with 6 series ignition boxes
MSD E-Curve Distributor is not legal.
HEI Distributors: must use MSD p/n 8728 Soft Touch
Rev-limiter or DUI P/N 380777.
Note: Circuit board modules with built-in rev-limiters are not
acceptable. You can continue to use the module but you will have to
use one of the two rev-limiters.
MSD Chip Values:
6,200 RPM Module = 4,787.7 Ohms ± 1%. Max reading is 4, 835.6 Ohms
7,800 RPM Module = 6,646.4 Ohms ± 1%. Max reading is 6,712.9 Ohms
8,000 RPM Module = 6,904.0 Ohms ± 1%. Max reading is 6,973.0 Ohms
Late Model Only Magnetos
MSD Pro-Mag Magnetos: Must use Pro Mag Box p/n 8106 w/max 8,000 RPM
Vertex and Mallory Magnetos: Manufactured by ETC, Inc
(307-856-1637) and available through their stocking dealer Fuel
Injection Enterprises at 541-990-2485
HI-6N Oval track Ignition, p/n 6000-6400
HI-6N Oval track Ignition, p/n 6000-6410 (Weatherpak Plug)
HI-6N Oval track Ignition, p/n 6000-6412 (Deutsch Plug)
HI-6RL Late Model Ignition, p/n 6000-6480: sealed, preset 8000 RPM
HI-6RL Modified Ignition, p/n 6000-6478: sealed, preset 7800 RPM
HYFIRE 6AL Digital CD Ignition, p/n 6853M
HYFIRE Off Road w/rev limiter, p/n 6867M
IGN, CT Pro w/rev limiter, p/n 6864M
Max-Fire Electronic Programmable Distributor is not legal.
300+ Ignition w/rev limiter, p/n 49300
DUI Rev Limiter Part# 380777 may be used with