Engine Mfg: Rambler (AMC)
Engine Code: na
Cylinders: 6
Displacement (cc): 195.6 cu in
Rev Limit: na
TPS or MAP: MAP
Boosted or Normally Aspirated: NA
If Boosted- max Pressure (KPa):
Modifications: 9:1 forged pistons, valve head port work, Weber 38/38, reground cam (increase LSA)
Chassis: 1961 Rambler American roadster
Notes:

this is the "old" six, not the "new" one intro'd in 64, aka the 232, 258. this is the old Nash motor that AMC stuck a new head on in '58 to tide them over until the new six. 3.125" bore x 4.25" stroke, very undersquare. practical RPM limit is 4500 rpm, but usable torque at 1200. the factory distributor provided 11 degrees mechancal 11 degrees vacuum advance for 22 total over the 5 BTDC static. as you can see the EDIS-6 is a huge improvement.

this map has more spark, even though compression is higher, probably due to improved cylinder filling and richer mixture (installed wideband AFR and runs 14:1 now).

this first of two maps(10 aug 2017) is on the current "high performance" (it's all relative, yo) build with Weber 38/38, T5 transmission and 3.42:1 axle and 24" tires. these maps were made cell by cell on the road, but 3800 up values are extrapolated.

the bins have been adjusted to better map the engine's usable range.



Last edited by tomicdesu on Thu Aug 10, 2017 11:25 pm; edited 2 times in total

Engine Mfg: Rambler (AMC)
Engine Code: na
Cylinders: 6
Displacement (cc): 195.6 cu in
Rev Limit: na
TPS or MAP: MAP
Boosted or Normally Aspirated: NA
If Boosted- max Pressure (KPa):
Modifications: more or less stock, 8.4:1 pistons, Weber 32/36 DGEV
Chassis: 1961 Rambler American roadster
Notes:

this is the "old" six, not the "new" one intro'd in 64, aka the 232, 258. this is the old Nash motor that AMC stuck a new head on in '58 to tide them over until the new six. 3.125" bore x 4.25" stroke, very undersquare. practical RPM limit is 4500 rpm, but usable torque at 1200. the factory distributor provided 11 degrees mechancal 11 degrees vacuum advance for 22 total over the 5 BTDC static. as you can see the EDIS-6 is a huge improvement.

this map is "before" the most recent build, the engine more or less in factory trim other than a Weber 32/36 DGEV, a T14 transmission and 2.73:1 axle, 24" tires. these maps were made cell by cell on the road, but 3800 up values are extrapolated.

the bins have been adjusted to better map the engine's usable range.

for september 2018, here is the map i've ended up with after logging many miles in all sorts of terrain, and driven hard; California Melee 2018, 6500 miles out east to the Hot Rod Power Tour (why'd i do that), some 11,000 miles this year alone.

there's *less* advance than previous maps, reflecting a change in driving style (far more aggressive (when appropriate ) and running a much wider (higher) RPM range. i don't have a performance background; though a car nut for many decades it's only with this (paradoxically old-fashioned engine) that i've been pushing it, and hard. 4000 rpm in this this is 500 rpm from redline.

with the current nicely tuned Weber 38/38 (next year: IDF44) this map allows full power 2000 - 4000 rpm with no audible ping nor measureable detonation, and it runs subjectively just great. compression is 9:1. i run the cheapest gas possible in town, and mid-grade quality on the tours and fast events.

also i'm using my own MJLJ tuner program, it's written in Processing, and runs on Linux (or windows or IOS). it's fully compatible with the official version with some limitations (manual editing solves those).