Just another 2.7 RS

[Henry Schmidt]

Last month we finished an engine for this beautiful little 73 RS light weight.
The dyno numbers were surprising.
The engine was built using stock specifications and produced some nice performance number. We have to believe that the performance increases are the result of dry film and thermal barrier applications. The DU bushings in the rockers also assist in the reduction of parasitic loss in the top end.
Altogether some nice numbers.

[Lapkritis]

Looks great Henry - very nice power up top. What did you do for thermal barriers? I think these have great promise in the air-cooled 911 engines as you may suspect.

[Turbo_pro]

Just another beautifully restored, 1/2 a million dollar factory RS with an incredible Supertec engine; what could be better?

I want one!!!

[jpnovak]

Coatings are a huge benefit. I coated my 3.2SS and have coated 930, 911SC, hot 3.0 parts for others. Each engine runs smooth and makes more power based on butt dyno.

I have seen increased torque as a function of fuel consumption, can run more timing (EFI, knock sensor safety) and slightly leaner mixtures with coated pistons and heads.

It is nice to see numbers to back up my empirical observations.

Great work Henry.

[Henry Schmidt]

Originally Posted by jpnovak

Coatings are a huge benefit. I coated my 3.2SS and have coated 930, 911SC, hot 3.0 parts for others. Each engine runs smooth and makes more power based on butt dyno.

I have seen increased torque as a function of fuel consumption, can run more timing (EFI, knock sensor safety) and slightly leaner mixtures with coated pistons and heads.

It is nice to see numbers to back up my empirical observations.

Great work Henry.

Thanks JP
We were pleased to see the performance enhancements in real terms. Whenever possible, we like to build engines with well documented specifications with only minor changes so that the "real" value of the enhancement can be tested.

This engine was dyno tuned by an independent third party to ensure that no bias was added.

[91133]

Great to see someone backing the TBC approach - very much wanted to do it on my current build (911/63 spec) but the drama with piston top and skirt clearances was just too great to risk with a 'limited' budget. I would be interested in the TBC approach for the case though as this remains doable for us.

[lindy 911]

I used a thermal coat on the piston tops of my 10.5:1 3 liter. I have no front oil cooler, just the engine cooler and never get past about half way up the gauge, even in Texas summer heat. Some say the TBC will not let the piton grow with heat gain and end up with a loose running engine. I have not found this to be the case. Also, the piston skirts were treated with dry film and the engine idles quietly (except for the exhaust).
I also did the main and rod bearings with the dry coat.