Lotus Elan

Relay in addition to starter solenoid?

PostPost by: disquek » Thu Mar 21, 2019 2:41 pm

The PO of my car (S4 with BDP) had installed a regular relay between the key and the starter solenoid.

The starter is a Tilton Super Starter hi torque.

I've never seen this previously. Before I remove the relay, I wanted to see if maybe the Elan key switch wasn't up to the current required by the solenoid or if there was some other issue that I wasn't aware of.

Thank you!!!
-Kyle
'70 S4 Elan - Cosworth BDP & Spyder Chassis
'62 S2 Super Seven Cosworth
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PostPost by: alan.barker » Thu Mar 21, 2019 6:09 pm

Are you sure the po has not put all the Cables on th same Terminal of the Original Starter Solenoid to use as a Terminal Block. I think the Tilton has an internal Solenoid. The Relay is to stop too much power going through the Ignition Switch.
Alan
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PostPost by: disquek » Thu Mar 21, 2019 6:24 pm

Yes. I'm sure.

The PO has put a relay between the key and the solenoid. So the key activates the relay. The relay activates the solenoid.

-Kyle
'70 S4 Elan - Cosworth BDP & Spyder Chassis
'62 S2 Super Seven Cosworth
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PostPost by: englishmaninwales » Fri Mar 22, 2019 1:56 pm

Maybe fitted to get around old wires and connectors resulting in sufficient voltage drop, especially when hot, resulting in failed start.
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1994 Caterham 7
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PostPost by: billwill » Fri Mar 22, 2019 4:04 pm

The inductive nature of the solenoid activating coil tends to make the starter contacts on the ignition switch spark and burn, so fitting a relay as described lengthens the lifetime of the ignition switch.

Relays are cheaper and more readily available than ignition key-switches.
Bill Williams

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PostPost by: Frogelan » Fri Mar 22, 2019 9:14 pm

I think there have been bits of debate on this already (I'm rather tired now to look it up).

I'm hoping to use a relay to the intergrated solenoid on my starter motor (I have no old loom for reference and have not looked up the details).

Could someone sketch up a diagram showing the best solution that does not damage the ignition switch or the starter by any chance ? Recommendations on relays would also be very appreciated !

Many thanks
1965 Lotus Elan S2 26/4022 (originally Dutchess Lotus East, PA and NJ Area, USA)
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