Thread: carb size ?

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Try this at home.....

Set a cam "straight-Up" set the initial timing at 8degrees BTDC....

now pull the front cover....degree the cam 4 degree advance....put it all back together....run the engine....

Now read the timing light....Notice I did NOT mention touching the distributor.... cause I did NOT....

The timing light WILL read 16 degrees BTDC.... bet you a Dollar....

The cam is fased with the distributor in this situation.... we moved the timing in relation to the crankshaft.....

Some will argue when you adavnce a cam you have to reset total time you have to bump it back 8 degrees....

Oldsmobile would argue in it's day the fact that the more you advance a cam the more total it can handle.....

Also running a cam "straight-up" you will be lucky to get the initial timing up to 16 degrees and it will still start most time it wont.... It will drag hell out of the starter/ kill the battery

Advance it 4 and initial at 16 it will crank easy as pie.....I have rebuilt umptine Olds motors...Tis how I know....

Same theory works on any engine you can adjust the cam without pulling the distributor....

Do you supose thats why in computorised vehicles the General may run as much as 55-60 degrees total

Any debate?