? air over electric senders?

where can i get the sending units to trigger the pro mag timing control box with air pressure. it needs to be a normal open unit so i can retard timing down track.

 

Bruce:

Call me please.

Bill Ancona 817-563-7222

 

I use switches that Bob Brooks sells. They have provisions for an air fitting on top, one terminal (common) on one end and an NO (normally open) terminal and NC (normally closed ) terminal on the other. They are very light and very durable. You can set them side by side and they take the shake very well. I put them in DT's car and he's got many miles on them.

 

try www.mscdirect.com

 

Mike, Last time i chaecked they had them, can't find 'em, now. For a normally closed switch use Mr Gasket part # 7872 (cost about $13), for a normally open, use autometer part # 3241.

 

Mike, I went to the auto parts store and got a couple of idiot light senders. They have 3 prongs and you can pick either normally open or normally closed. They are preset for 3-7 lbs, the burst pressure on the Hobbs switches is 750 lbs. i'll be trying them out this weekend on the air solenoids and i'll let you know how they work. Best part is only 6 bucks.

 

hi bruce i use a brake light switch the old style run by brake pressure it has a 1/8 pipe on it you can take a female fitting and put it right on it and wire it in. its normaly open and you can wire it in to the box. if you need more info call me at 207-793-2078 thanks

 

Bump for Nitro Madness

 

I have built several six shooter timers and pressure switches. I use a hobbs which you can get at your local parts store. The one I use is NO and has a 50 lb. opening pressure. I was afraid to use the low pressure switch as bad things can happen when it only requires 3-4 lbs to close the contacts.