which Starter selinoid for wiring relays in the car?

[monte_kev]

Anyone have the part number for the starter selinoid everyone uses for relays in race car wiring?

[Sparky]

I don't have the Part # but, Most NAPA Stores carry them. Just ask for a constant duty solenoid.
It is a complete waste of time to use these for N20 and Fuel pump.
A normal 40 amp relay is enough to support most N20 systems and Fuel pumps. I have tested back to back Solenoids vs. Relays. There were no gains what so ever with the Solenoids vs. Relays. If you’re worried you’re going to shake a relay with tire shake. It's going to take some serious shake to disrupt a locked relay. I think using these solenoids is more a case of monkey see, monkey do.

A good overlooked example of this is:
Most all of Pro Mod/Pro Stock cars run Electric Shocks, most Shock Controllers with a Digi-Set Timer are mounted on the Right front area of the Wheel Tub.
A Digi-Set Timer is no more than a mechanical relay with a timed circuit.

Now, what area of a racecar is going to experience more violent shake then the wheel tub area?
Having said that, I have never seen the Electric Shocks bounce back and fourth from position to position due to tire shake upsetting the Digi-Set, nor have I seen anyone use a timed circuit to control a starter solenoid for the shocks.
Monkey see, Monkey do….
I hope this helps
Sparky
www.wiresandpliers.com