I just got my DUI distributor in the mail. It's late I'm tired and I'm not tearing my old one apart right now but does anyone know if there are supposed to be c clips installed on the posts the weights go on. I found them in a weird position when I opened it up, over lapping eachother. (There are grooves in the post for a c clip)

also does anyone know the specs of this vacuum can based on this number. I did a quick search and could not come up with anything.

 

I would add the e-clips.
I could not find any reference to 51610 for that vac advance canister.
Keep an eye on those weights for wear where they rub against each other.
I would think that Davis uses quality weights, but ???
Soft weights wear. And then you have strange throttle response issues that have nothing to do with the carb.
Moroso makes "glass hard" weights that do not wear.

 

Thanks for your response.

I did some digging and it seems to be the 516 is the last 3 digits of the GM pn for the can and the 10 is how many degrees it is capable of adding?? Still trying to find when the can deploys.

 

Double post

 

Slap a bunch of lubriplate (white grease) on the weights to reduce friction and wear.

Don't forget, the weights and springs are tuning aids. They can easily be swapped and mismatched to get a desired timing curve. You can have one big and small weight or one light and heavy spring like in the picture.

Weights determine how much advance is in the curve. Springs determine how quickly the advance goes through the rpm curve.

 

Are there any numbers on the other side?

http://outintheshop.com/faq/Vac%20Adv%20Spec.pdf

 

I agree 100% with NoEmissions84TA here , I wouldn't trust those weights to not lift up beyond where they belong without the missing C clips . If the manufacturer spent the .002 cents per unit machining those C clip grooves , it means they are needed , and were forgot during that particular distributor's assembly .

Send your photo of the area of the missing clips to the retailer and tell them , nicely , that you'd please like ALL the parts the distributor was supposed to have been built with ......

 

I spoke with Davis today and the girl yelled across the room to her manager and he replied just push them down and put thenrotor back on...

I asked about the can and they said it will give 15 degrees I said ok I asked for only 10 in the can. Ok ya that's what it is.

I have been quite less than satisfied with them considering the money I paid for the unit.

 

That it ****ed up I will never order from DUI now.

 

Yep , the "push them down" comment would be enough for me to scratch them off of my preferred vendor list .....

 

Alkyiroc if you see this I would akso like your opinion on the clips, you have been always been very helpful to me.

 

I don't think I've ever seen an HEI without clips but then I also haven't seen or used one in years. Unless the shafts are very worn out, I highly doubt the weights will lift up enough to disengage. The last time I used an HEI, I welded everything up so it wouldn't move and locked the distributor to full advance.

If it bothers you, go to the junkyard and pull some clips off an old HEI.

 

I can't believe that distributor was not supplied with a vacuum advance limiter plate.
https://www.summitracing.com/parts/crn-99619-1

 

My worry about the missing clips is this ;

In reality , I do think the rotor being in place would keep the weights from lifting , until such time the weights have worn out the bottom of the plastic rotor enough to allow the weights to lift up enough to cause problems . I'm sure that's why it was originally designed with the clips , it's gonna take a Hell of a lot longer to wear out those metal C clips that it will take to wear out the bottom of the plastic rotor . Remember , centrifugal force (the spinning weights) is a fickle mistress indeed , and if the design calls for clips I personally wouldn't dare run it without them .

Also , again I agree with NoEmissions84TA , the original poster says he paid top dollar for that distributor , and with the missing clips and omitted limiter plate I don't feel he got his money's worth ...

 

Is this the one?

https://www.summitracing.com/parts/d...20rd/overview/

 

It's not a street strip.. They have a lineup they offer for the gmpp crate motors with fastburn heads. It came w 22 degree total mechanical all in By 3000. Gm claims the fast burns do not like more than 32-34 total. I played around with advance kits in my old distributor as far as I'm concerned there junk they bind up etc.

Davis uses a good old sun machine and dials it in.

I'm going to pull my old hei Sunday and see if theres clips over the weights.

The rotor really has nothing to do with holding the weights in place. It cant or they would bind on them. I am convinced with the centrifugal motion the weights would never end up in the position i found them in due to shipping, however if they are going to rise up they could possibly knock the springs off.

I have been less than satisfied. However I'm going to see how the car performance is with the new curve in it. I did talk to a guy in tech while I was in the ordering process I played dumb and was pretty impressed with what he was telling me. The fastburns really are sensitive with the timing. An off the shelf hei will ping those heads unless you run around 7 or 8 degree base.