EDIS modified pulley balance tolerance ok?

[Alexander_Monday]

I have modified a Berg equalizer pulley ( 6-3/4" diameter ) to be the trigger wheel for EDIS. I drilled 36 holes of the same diameter and depth equally spaced around the diameter taking out 2.4 grams each. I then removed the material between 2 of the holes for the missing tooth. I removed 2.6 grams while creating the missing tooth. I went to the 180 degree opposite 2 holes and removed an equal amount from the bottom of each of the 2 holes to remove 2.6 grams total from them. The scale I have is +- .2 grams accuracy.

Question is, will this be close enough for balance ( 8000 rpm ), or do I need to send it off to get the balance checked. ( Yes I know it wouldn't hurt to have it checked, however no one that I know of in this area SW Missouri can check it. )
_________________
Danth’s or Parker’s Law:
“If you have to insist that you've won an internet argument, you've probably lost badly.”

Alexander_Monday->What were the rings gapped at?
bedlamite->Almost enough.

[blue77bay]

man at 1111101000000 rpm i would certainly be concerned with balance ,send it to jake he has a bad ass balancer or locate another balance shop to do it, i hope the rest is well balanced

[Alexander_Monday]

LOL Good one, but its only 100100 holes.
_________________
Danth’s or Parker’s Law:
“If you have to insist that you've won an internet argument, you've probably lost badly.”

Alexander_Monday->What were the rings gapped at?
bedlamite->Almost enough.

[westcoast-paul]

that looks like aluminum.

The VR sensor is a magnet. Am i missing something?
_________________
- Paul

[Alexander_Monday]

Believe me it is steel. Took all evening to drill with hand drill & homemade jig.
_________________
Danth’s or Parker’s Law:
“If you have to insist that you've won an internet argument, you've probably lost badly.”

Alexander_Monday->What were the rings gapped at?
bedlamite->Almost enough.

[Lionhart94010]

Great Post Alexander,

I was thinking of doing the same type of thing with my berg pulley for my FI motor; you beat me to it!

I would be interested to hear how it works out and what size drill bit you decided on, bracket you have/ will make to mount the sensor… :0)
_________________
Current VWs 71 T2 Westy SO-72/6(Miami), 71 Crew Cab, 2015 GSW TDI
Other owned VW’s 59, 68 1500s, 69 & 71 Bug’s; 72 & 73 S-Bug’s; 67 Westy, 67 Deluxe, Other 71 DC, 72 KG GT that now lives in Australia, 12 JSW TDI, 2015 GSW TDI, 2023 Tiguan
VW technical information sights
thesamba - www.ratwell.com - www.shoptalkforums.com/ - www.vw-resource.com - http://www.type2.com/
http://bobhooversblog.blogspot.com/ - www.aircooled.net/gnrlsite/resource/articles.htm

[Alexander_Monday]

Lionhart,

I plan on fabricating a bracket for the VR sensor that attaches to the lower passenger side threaded hole ( universal case ) that is not used in the type 1. This is an experiment, so since I have started it let me go through the R&D to see if it works before you try it. I have to go out of town tonight and will not be back home until next week, at which time I plan on bench testing the design to see what the VR signal looks like on a scope compared to a factory Ford trigger wheel. If it looks promising I will then bench test the whole EDIS system. I am going to use MegaJolt to control the EDIS, and eventually MegaSquirt for FI as well as ignition, but I am taking little steps at a time before the plunge. I will keep you informed.

The actual reason for the post is that I do not know what level of accuracy is needed for the balance. I should be within .5 gram with my +-.2 gram scale. If anyone can tell me if this level of balance is sufficient I would greatly appreciate it.
_________________
Danth’s or Parker’s Law:
“If you have to insist that you've won an internet argument, you've probably lost badly.”

Alexander_Monday->What were the rings gapped at?
bedlamite->Almost enough.

[koolkarmakombi]

[slowtwitch]

Alexander, I'm in the process of doing something similar. I'm sending my pulley out , to be dynamic balanced.

Here's my project....if things go as planned (and they never do) . I'll have this setup in the engine in a few weeks.

Good luck with your project, looks good.
_________________
pete

[the2ndcashboy]

Slowtwitch: where are you going to send your pulley to be balanced? I did mine using the toothwheel off of an Escort, and I'd like to know if its balanced well enough.

[mynameistory]

Unless you feel like sending out your whole crank assembly, pulley to pressure plate, don't bother. Although that thing IS pretty massive. I tried to make mine lightweight.

[Alexander_Monday]

Lionheart,

Here is a picture of the vr signal on my ancient scope. (Excuse the blur I took it by hand while holding a cordless drill with the Berg pulley in the other) It looks identical to the signal from the factory trigger wheel! I used an 11/32 bit for the first set of holes, and a 13/32 bit to clean up the holes. They are 1/4" deep. I have already taken apart the jig I made, however it consisted of a 1/4" piece of aluminum sheet that I had previously cut a 6-3/4" hole out of, a piece of plywood that the aluminum was bolted to, a long coupling nut that I drilled out to 11/32 (then 13/32) bolted to the board with spacers to the height I wanted through the aluminum to use as a drill bit guide. I drilled a hole every 10 degrees, centered 5 degrees offset, because the space between the holes is the equivalent of the teeth. I then removed the metal between 2 holes with the same jig. This is the stock size equalizer. You would need to adapt the hole sizes for a different diameter.

_________________
Danth’s or Parker’s Law:
“If you have to insist that you've won an internet argument, you've probably lost badly.”

Alexander_Monday->What were the rings gapped at?
bedlamite->Almost enough.

[Lionhart94010]

Alexander,

Great picture!

Do you see the missing tooth signal pass by on your scope?

Are you supercharging or turboing your bug? You may need wheel bars :0)

What is your ETA on firing-up your setup?
_________________
Current VWs 71 T2 Westy SO-72/6(Miami), 71 Crew Cab, 2015 GSW TDI
Other owned VW’s 59, 68 1500s, 69 & 71 Bug’s; 72 & 73 S-Bug’s; 67 Westy, 67 Deluxe, Other 71 DC, 72 KG GT that now lives in Australia, 12 JSW TDI, 2015 GSW TDI, 2023 Tiguan
VW technical information sights
thesamba - www.ratwell.com - www.shoptalkforums.com/ - www.vw-resource.com - http://www.type2.com/
http://bobhooversblog.blogspot.com/ - www.aircooled.net/gnrlsite/resource/articles.htm

[Mr. Unpopular]

I can't imagine you'll have a problem.

A friend of mine stuck a 20v Toyota motor in an old corolla. He used Megasquirt and an EDIS setup to run it. He just eyeballed the trigger wheel to the balancer and tacked it into place. He spun that motor 9200 RPM every chance he got without issues.
_________________
"In any racing engine, the nearer you are to it disintegrating, the better it's performance will be"
-Keith Duckworth, creator of the Ford/Cosworth DFV

[Alexander_Monday]

[Lionhart94010]

Thanks for the better picture, sounds like you will have one fast bug when you are done :0)

I know what you mean waiting for parts is a drag :0( hope you get them soon!
_________________
Current VWs 71 T2 Westy SO-72/6(Miami), 71 Crew Cab, 2015 GSW TDI
Other owned VW’s 59, 68 1500s, 69 & 71 Bug’s; 72 & 73 S-Bug’s; 67 Westy, 67 Deluxe, Other 71 DC, 72 KG GT that now lives in Australia, 12 JSW TDI, 2015 GSW TDI, 2023 Tiguan
VW technical information sights
thesamba - www.ratwell.com - www.shoptalkforums.com/ - www.vw-resource.com - http://www.type2.com/
http://bobhooversblog.blogspot.com/ - www.aircooled.net/gnrlsite/resource/articles.htm

[Alexander_Monday]

[miniman82]

Great post!

Maybe I'll copy you, since my CB pully leaks like a friggin stuck pig.

[Alexander_Monday]

Actually, I machined another keyway in the pulley to be able to move the
sensor. A machine shop wanted $120 to do it, so I figured what the heck if I
mess it up Ill buy another one. Believe it or not I used a sawsall, took my
time, and it came out perfect. I know I was shocked.
_________________
Danth’s or Parker’s Law:
“If you have to insist that you've won an internet argument, you've probably lost badly.”

Alexander_Monday->What were the rings gapped at?
bedlamite->Almost enough.

[miniman82]