twin ignition head temps?

[Shuie]

Do any of the builders here have thoughts on whether or not using a twinplug setup on something like a 9.5:1 2.5L street engine would help reduce cylinder head temps or make the engine last any longer than normal? I understand it would be unnecessary, but would there be any benefit? Would it make oil temps more manageable or make the car run better on regular pump gas?

TIA

[BURN-BROS]

Hi Shuie,

The timing reduction would lower cylinder head temps by lowering cylinder pressure BTDC. The lower cylinder pressure would also guard against detonation.

[Flieger]

It will also give you a wee bit more power because you can run less advance.

[Carbster09]

I would love to twin plug the2.5l in my 914/6 ... but is the expense worth the gain? Maybe 5% more hp? What is the overall cost? $3k ish?

[Flieger]

I doubt it would be 5%. Maybe 1%. The real reason to do it is to allow for higher compression ratios (which on an old 911 requires a high-domed piston), which will make more power.

[Steve@Rennsport]

Originally Posted by Flieger

I doubt it would be 5%. Maybe 1%. The real reason to do it is to allow for higher compression ratios (which on an old 911 requires a high-domed piston), which will make more power.

Its more than 1%, all things being equal.

The gains transcend just BHP,.......you get improved throttle response, improved drivability, and lower cylinder head temps (which on a hot day, help VE's).