Have 327 trying to get the timing right some info I get is from 10 12 btc and other say 4 to 8 btc what should it be? I have it set at 8 and seems to run well but when I run it to 2500 to 3000 it seems to have some hesitation could that be my mixture need to be set different? I get the highest vac at this setting I hope I'm going in the right direction Posted using the Full Custom H.A.M.B. App!
Going from memory.....stock specs for a 250/300 hp would be at 4 degrees. A little advance would change idle and or performance some. You get it to high and I think it will crank hard. Been a few years but 4degrees can't be far off. Tim
Try 4 - 6 degrees BTDC. Pop the cap and rotor off and check your centrifugal weights, make sure they're not sticking. That could be the source of your hesitation.
Does anybody know where in Louisiana that has a dyno That could help me get this tuned right? Posted using the Full Custom H.A.M.B. App!
Have you checked the total timing? It should be somewhere around 34-36 degrees when the RPM's are at 3000 or so. If its at say 8* initial (with the Vac line removed and plugged) and you raise the RPM's up to 3000 you should see the mark move a good bit under the timing light. If the advance weights are stuck or not fully advancing there is your problem most likely.
Another point that hasn't been addressed yet is make sure your accelerator pump activates the discharge when the throttle is moved, instantly not lagging the throttle movement. When discharge lags throttle movement a hesitation is the usual reaction. Frank
put a mirror over the carb air inlet and open the throttle up some and you should see a squirt of fuel in the barrels , you can also check the accel pump lever ( depending on the carb type ) do not put your head over the carb while the car is running , a backfire can blind you or at worse give you a weird haircut and eyebrow removal ..
First off what kind of timing light are you using. A fancy one with all the bells and whistles that lets you set your advance or just a regular strobe gun that you hook up and shoot at the balancer marks? Second. If it is a regular gun without the bells and whistles I would suggest that you get MSD timing tape and install it on your balancer like so. Third. Plug off your vacuum line. at carb and distributor Fourth. Fire the engine Rev and hold at 3000RPM to take out the mechanical advance out. Read the tape. You haven't told us anything about the motor so I am going to think on a conservatively 30 -34 degrees total? You don't need a dyno to set this thing up. Just common sense and some ***istance from guys on this site. Jay
Make sure your balancer is for a 327,not a 350,t.d.c. is different in relation to the crank keyway,forgot by how many degrees it was.
Thanks you guys for the help I have hei distributor and I'm using matco mtl500 timing light going to put timing tape today and see Posted using the Full Custom H.A.M.B. App!
Todays fuel is different for when this car was built,my need some more base timing.Hei usually have a very slow advance curve,change the springs and weights,increase spark gap to at least. .045
May be bad question but just checking Is this the right way for the timing tape ? Posted using the Full Custom H.A.M.B. App!
Yes. As long as the TDC postion on the tape is on the mark of of the harmonic balancer you are good to go. Remember. Counter clockwise will advance the timing. clockwise will retard. set it at about 30 and see where it sits. Jay
I would also make sure since your running a aftermarket cover and tab that TDC lines up with your marks. Pull #1 plug use a piece of coated wire rotate engine by hand you should be able to tell by feeling inside plug hole when the piston reaches the top 8 degrees initial and 30-34 total should run great Posted using the Full Custom H.A.M.B. App!
Don't mean to hi jack,but I have a 390 Caddy engine---my centrifugal advance is only 12*--so to get total at say 32*,I would have to set initial at 20*,but the books say sat it at 5* which would only give me 17* total--any thoughts on this?
If your distributor has 12 degrees of advance in it this will translate to 24 crank degrees; as the crank rotates 2x for every revolution of the distributor.
Will try to start it tomorrow and see if the tape stays I used clear paint to try to see if it will stay Posted using the Full Custom H.A.M.B. App!
FWIW, stock points that are double sprung will go to 7,500 rpm for about a week. Then, as the plastic dizzy lobe follower wears back, only to 65 to 7,000!! And I always timed mine by the starter kick-back method AND THEN threw a timing light on her. pdq67
a question nobody has asked is what carb is being used if it is edelbrock the vac might be hooked to the wrong port just a thought tom
The Jalopy Journal
