Discussion in 'Buick FAQ' started by LARRY70GS, Jan 2, 2005.
OK, make it "First Time at the track with my Buick" Just start another thread in The Bench.
40 pages for ignition issues and information, wow.
Larry you wrote that Buicks have fast burn heads or most of them.
Did you know if the 300 V8 had them too?
I'm at a learning stage at Buick 300 engines. I know SBC's, BBC's same on Fords, also Flatheads Ford.
I read a lot about the 300 engines the last 2 weeks and know that there is nearly no aftermarket for these engines.
On our engine there is the stock distributor, I want change to a pointless version with all the adjustable stuff my MSD has on my SBC (I changed the non adjustable vacuum can to one adjustable from ACCEL and add 8° of vac advance, also recurved with changing the springs etc.). I found some distributor that will fit.
You have options with your stock distributor like adjustable vacuum advance, advance limiter plates, one wire electronic ignition conversions, etc. ALL of which I sell.
Do you ship international?
Yes I do. send me a PM
Would the two silver springs make the advance come in at 2200 on any distributor, or only the Buick HEIs, or only your distributor?
No, those RPM are approximate. Weights vary, so you must check. Easy to do with a light and tachometer.
Two silver gave me about 2600rpm all in with a TA HEI. I have a silver and a yellow and it's around 2100 all in. Still have to adjust the vacuum advance, but it's snowing right now so i really don't want to bother with it. The crane kit is a good kit, I like it. Question: you only have to use the limiter plate if it puts too much vacuum advance in, right? What amount of advance does it put out uninhibited? I didn't find that number in the instructions.
A lot, at least 20* I would say. If all your mechanical advance is in by 2100, hook up your vacuum advance, rev it to 2100, and use the dial back light to see what your total is. Then subtract. With all your advance in that early, your vacuum advance may put you at mid 50's, and that can frequently cause part throttle ping or surging. In General, mid 40's works best, so 8-12* is what you want.
The limiter plate is used to reduce the amount of vacuum advance. If you follow the directions, they tell you to attach the plate on end mounting screw of the canister. Then when you rotate the plate, it pushes the link further into the canister. This is undesirable for 2 reasons. One, it retards your initial timing (2* per tooth), and two, it preloads the spring inside the canister.
A better way to use the plate is to drill and tap a hole in the canister arm AHEAD of the link. That way, the plate limits the distance the link can move, and therefore limits the amount of advance the canister can deliver. You can adjust the spring independently with the allen key through the vacuum port.
Interestingly enough, the instructions I found don't mention the limiter plate at all, but just an adjustment through the vacuum port. I am wondering if the Crane units are now like the Acell adjustable vacuum advance canisters. The allen wrench adjusts amount and rate of vacuum advance at the same time.
So if I install the plate as you describe... Would I need to mess with the allen adjustment at all? It says to turn it all the way clockwise... Is that setting max vac advance? I assume so because it then mentions drive around and back it off two turns if it knocks. I have it attatched to ported vacuum with the adjustment screw all the way in. Drove around and didn't notice any lnocking longing or surging. With the ta HEI my timing must have been around 52*. I have 9.5:1 with a crower level 3... Maybe thats why it can tolerate so much? I'll have to double check it with a light to be sure its working.
See post 790 above. Did the limiter plate come with your kit? I ask because the new instructions don’t mention the plate. Do your instructions mention it or are they like the ones I attached?
Previous kits used the plate to limit the AMOUNT of vacuum advance. The Allen key adjustment controlled the RATE. Varying the spring preload controls when the vacuum advance comes in (vacuum level) and how fast it goes away when you punch it.
I’m not sure if the current Crane canisters have the adjustment all in one via the Allen key like the Acell units did. You should be able to tell with a vacuum gauge and timing light.
My kit did come with the plate and directions on how to use it, must be an older kit. Bought it from summit.
OK, then you have everything you need to set it up. If you send me an e mail to the address in my signature, I’ll send you some more pictures on how to mount the plate.