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duragg

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Posts posted by duragg

    Crane Xr3000 stable vs, HEI?

    in Nissan L6 Forum

    Posted · Edited by duragg

    Pictures.

     

    The weights. Except for different springs seem identical.

    post-1894-095825600 1319212821_thumb.jpg

     

    The shaft. Yes, by design it has different slots.

    But somebody has welded the shorter slot shorter.

    post-1894-018546200 1319212817_thumb.jpg

     

    My issue with this is that when the first weight hits its stop, the other weight is free to continue tugging on the arm.

    It can't go far, but it can probably bounce around enough to making the timing dance a bit.

    post-1894-073370700 1319212810_thumb.jpg

     

    Machine shop has the parts and they are going to weld and recut so the slots are both equal.

    Both weights will be on their stops when the advance is all-in.

     

    If (or when) this doesn't help or make it worse you an all laugh at me and say "we told you so noobs".

    Crane Xr3000 stable vs, HEI?

    in Nissan L6 Forum

    Posted

    Hard to see in the picture, but one slot is closed down a bit and the other is standard length.

    So when the first peg gets to full advance, the second is still being TuggeD on by the other weight.

     

    Uneven tugging on the centrifugal advance cannot make timing any MORE stable.

    Crane Xr3000 stable vs, HEI?

    in Nissan L6 Forum

    Posted · Edited by duragg

    Look closely in the picture below, the slot to the upper left has a small "thing" limiting the centrifugal advance.

    But the slot to the bottom right does not have any limit.

     

    I see no reason not to weld both and recut the slots to precisely the same length to give the total advance range I want.

     

    Lots of articles on the internets about timing bounce.

    I think this is (one of) my problem.

     

    Perfectly stable until near the centrifugal "all-in" point. Then bouncy.

    INcreasing further RPM past that and the bouncy lessens (as centrifugal force exerts more control).

     

    Soon it will be known.

    post-1894-009281900 1319166778_thumb.jpg

    Crane Xr3000 stable vs, HEI?

    in Nissan L6 Forum

    Posted

    Pulled and inspected dizzy and everything is tight.

    Vac advanced plate is fixed. No movement possible.

     

    What I did notice is the mechanical advande slot on one side is welded to limit advance, but the other slot is not. So one weight has additional advance it could go if not for the weld on the other side.

     

    Perhaps at certain rpm the lack of constraint of one weight is causing vibration of the other and making the scatter I am seeing.

    plain steel wheel

    in Brakes, Wheels, Suspension and Chassis

    Posted

    I saw a picture of a Z with what looked like a plain steel wheel.

    I really liked the look, simple, flat black..

     

    Is the problem with those just the weight?

     

    http://www.bassettwheel.com/dhole_asphalt.html

    Seems like this company has something that would be simple, clean and cheap for a rat-rod type look.

     

    I like the idea of a 15x8 front and 15x10 rear or along those lines...

    Doesn't seem like these weigh much different than the group buy Rotas?

    Crane Xr3000 stable vs, HEI?

    in Nissan L6 Forum

    Posted · Edited by duragg

    Very helpful, thank you.

     

    So I will pull the dizzy and drop off at the machine shop to get rebushed.

    Or do I just buy a new one, and install my eyeball in there?

     

    Not opposed to spending some money to have nearly perfect ignition as reduction in variables only contributes to Triple DCOE performance.

    (edit: $150 ish to fix a dizzy is fine (my machine work is free). SPending over $150 makes me think crank fire.)

     

    ... Yet again, building an entire car around 3 italian carbs!

    I wouldn't have it any other way.

     

     

    Unless I win the lottery and install: www.imagineinjection.com

    Crane Xr3000 stable vs, HEI?

    in Nissan L6 Forum

    Posted

    Today:

    Pulled valve cover and verified Cam mark and piston #1 at TDC.

    I made a more distinct white ZERO mark on the pulley and indicator to line up #1 TDC mark.

    Switched to B8ES at .041" gap plugs.

     

    Started the engine and set timing max advance at 34btdc (elevated RPM). This gives me about 14 Initial.

    I then phased the rotor to the Cap and shot this video.

     

    What you cannot see:

    * Using a Snap-On variable timing light to keep the white marks on the pulley aligned at Zero.

    * Then reading the timing from the dial.

    * Then shooting the light at the cap and you can see the rotor alignment is better (without touching the dial / same rpm).

     

    At idle and up to maybe 2000rpm the timing marks are rock steady.

    From maybe 2000 up the timing marks starts to jump around quite a bit.

    Much higher rpm is steadies a little bit, but not rock solid.

     

     

    Rotor cap for testing.

    post-1894-007796200 1318812537_thumb.jpg

     

    Felt a lot better driving after this. But still concerned about those marks jumping around.

    Dyno run

    in Nissan L6 Forum

    Posted · Edited by duragg

    Thats pretty cool. I need to do the same with my new L28 motor running the same Isky Cam.

     

    I have a wideband in my car and my butt feels like best power is somewhere in the 11.5 to 12.5 AFR. Similar to what you have there.

    My sensor bottoms out at 10AFR.

     

    What timing do you have in it?

     

    THose charts are corrected to Sea Level, Standard Temp and Pressure already (normally). It says down at the bottom left "* Correction Method: Standard".

    In the airplane world that means SL, 15c and 29.92. Not sure what exactly they would use.

    Engine Rebuild Questions

    in Nissan L6 Forum

    Posted · Edited by duragg

    If I recall my machinist had me use 1.8 to 2.2 thou (.0018"-.0022") on my motor 3 months ago.

     

    The engine was a fairly recent rebuild and when disassembled I found +.50mm pistons with .004"+ piston to bore (sorry for mixing units)

     

    We blew it out the bores to use +1mm pistons and the tighter clearance.

    Crane Xr3000 stable vs, HEI?

    in Nissan L6 Forum

    Posted

    I'm not sure of anything with 3 DCOEs.

     

    I am running a mix of 100LL and 91 pump gas (50/50).

    Wideband shows low 12s at that time.

     

    This motor just seems to pull hardest in the low 12s.

    Starts sneezing in the mid 13s.

     

    Could be one carb over or under contributing, but all plugs look similar.

    Could be the O2 sensor getting funky from the lead in the 100LL

    Could be just the way triples run and want to be richer.

     

    So, today I will recalibrate the timing again and do the phasing procedure on the Optical wheel again.

    Will also hunt down some different plugs and gap up to .040 or something.

     

    Appreciate the help.

    Crane Xr3000 stable vs, HEI?

    in Nissan L6 Forum

    Posted

    Seems under full power the thing is pretty stable.

    But idle and part throttle - say holding 3000 and waiting to stomp I can hear a little messing around.

     

    I wonder if that is in the helical gear on the crank or the half-moon higher up?

    Worth trying to tighten up?

    I think I can find a way to tighten up the middle joint easier.

    Crane Xr3000 stable vs, HEI?

    in Nissan L6 Forum

    Posted

    Summary:

    Crank trigger or a fancy machined wheel in a perfectly new Dizzy is best.

     

    A well running Crane or other dizzy based system for a hopped up street car should be fine perhaps.

     

    Thinking about all of this I will go back and re-do the "phasing" and make sure everything is tight in my current dizzy and see how that goes.

     

    Appreciate the input.

     

    Tj

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