spark plugs

baz1 · Hornet Joined: Oct 05, 2009 Posts: 55 Location: England

anyone know the correct spark plugs for my hudson hornet thanks

51hornet · Posted: Thu Feb 25, 2010 2:03 am Post subject: Re: spark plugs

Here are Champion and NGK numbers for the plugs that will work. I use the Champion H-10 in my 308's. Maybe you can still get Champion plugs in England.

Champion H10C or NGK B6L

Champion H11 or NGK B4L

baz1 · Hornet Joined: Oct 05, 2009 Posts: 55 Location: England

hi thanks for the info should get those here not to keen on the jap plugs the hudson might spit em out. anyway i have seen somewhere an article on timing the hudson with a vac gauge cant find it now any help out there thanks Barry

51hornet · Posted: Fri Feb 26, 2010 9:41 am Post subject: Re: spark plugs

Advance the timing until you get the maximum steady vacuum showing on the gauge, then back off 1 inch of vacuum on the gauge. Its best to use direct manifold vacuum for your gauge, the line going from the intake to the vacuum pump(if you have a dual mode fuel pump that has vacuum pump) try not to use the one going to the wipers it can give faulty readings. The line going from the carb to the vacuum advance is ported and won't give you the right reading either.

You can now use the vacuum gauge to set your idle mixture. Turn the screws in lean until you notice the vacuum drop a bit, then richen it up until you get max vacuum again. Do that for each idle mixture screw on your carb. When you think you have them right, check the idle mixture screw again. Repeat until a quarter turn and back causes a vacuum drop and recover. You will be at the optimum lean range for your elevation.

Using a vacuum gauge to set your timing will usually end up setting you timing more advanced than spec but it will be correct for your elevation. You should then check the timing with a timing light.

Its also good to pull the distributor if you can and check the advance canister to see if its moving freely and also blow out the distributor and make sure the counter weights are moving freely and apply a little lube. Its at times like these I pull the distributor apart and clean everything and install the Pertronix module to do away with points and condensors.