More pictures for more ideas?
The cam signal trigger wheel is 175 degrees, not 180 degrees.
IMG_0322.jpg
IMG_0326.jpg
IMG_0324.jpg
More pictures for more ideas?
The cam signal trigger wheel is 175 degrees, not 180 degrees.
IMG_0322.jpg
IMG_0326.jpg
IMG_0324.jpg
I have access to very accurate measuring tools. I don't know why 175 degrees, but the one I measured was 174.96 degrees.
What Inline 6 are you working with? Is there a factory distributor to leverage a dual trigger design. The SBC L31 was the distributor I leveraged because it has a CMP.
BTW, it's very expensive to make a custom "One Off" dual trigger distributor.
OBD2 is better than OBD1?
OBD2 is more expensive than OBD1?
dave w
I'm working with a 1988 Jeep 4.0 engine. There is a factory distributor that has a single trigger.
That's why I said I might be able to put the other one on the bottom of the mount plate. I'm not sure there's room.
I've been running a HEI big cap distributor for the last year. But something else has died in the system so I'm going to see if it'll run on a 0411.
I'm a retired machinist so I have time to play with it. All it'll cost is the price of the parts. I have a lathe and mill with rotary. They're both small but in good shape.
I already have a harness set up for the 0411. I'm still not sure what throttle body I'm going to use. The intake manifold has a weird 3 bolt pattern.
So I'll probably just machine an adapter for it to a GM throttle body.
My files are for the V8 Crank Trigger Wheel. Pictures below are the V6 Trigger Wheel and the V8 Trigger Wheel.
The spacing for the V6 appears to be 60 degrees evenly spaced, or 60 degrees high / 60 degrees low. The spacing for the V8 appears to be 30 degrees high / 60 degrees low.
V6 GM PART NUMBER 10230149
V6 Crank Trigger Wheel GM Part Number 10230149.jpg
V8 GM PART NUMBER 10190917
V8 Crank Trigger Wheel GM Part Number 10190917.jpg
dave w
Last edited by dave w; 09-19-2021 at 05:50 PM.
I have both of those and that is what they measure with the deg wheel I have.
I think the 6x trigger wheel I make for the distributor will need to be the same.
I have also thought about just milling the harmonic balancer. It has a ridge around the front of it.
4.0l jeep balancer.jpg
It's budget / skill / math decision. You got this.
The dual trigger distributor option provides for a very clean installation. The dual trigger distributor will require 6x crank triggers evenly spaced and 1x cam trigger. The alignment or synchronization of CKP / CMP signals is the next challenge.
Pictures below show alignment of the V8 24x crank trigger, V6 alignment similar.
dave w
DSCN3088.jpg
DSCN5358.jpg
For a nearly perfect 100% CKP/CMP signal accuracy, maybe use the harmonic balancer for both CMP and CKP? Maybe the outer ring / larger ring the CMP? Maybe use the inner ring / smaller diameter ring for 3x CKP? If I'm thinking my engine math correctly, then maybe machine two 87.5 degrees segments (175 degrees CMP trigger wheel divided by two) from the outer ring? Custom CKP - CMP brackets required. Custom balancing for the I6 Harmonic Balancer required. The BBC 8.1 Liter CKP sensor will read the Harmonic Balancer modified 175 / 185 degrees.
Link for the BBC 8.1 liter Timing chain and gear set: https://www.carid.com/melling/engine...3-4sr50sc.html
dave w
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