Superb video of 911 RSR motor build

[uwanna]

This is a beautiful montage of a 911 RSR race motor build from start to finish.
Great visual if you've never had one apart or built one from scratch!
Done by a German shop named Mittlemotor. 21 minutes of beauty.

Montage Porsche 911 Carrera RSR Motor - YouTube

[fanaudical]

I don't understand the use of the heat gun while tightening the bolts on the fiberglass shroud and engine "tin". Is that supposed to reduce cracking or something?

[jimtweet]

Originally Posted by fanaudical

I don't understand the use of the heat gun while tightening the bolts on the fiberglass shroud and engine "tin". Is that supposed to reduce cracking or something?

correct

[Flieger]

I don't understand not wearing a mask or glasses when using a cutting wheel on and sanding the fiberglass...

[rattlsnak]

why does it take so long to rev up when they go to wide open throttle? Must be restricting the fuel?

[ClickClickBoom]

Originally Posted by Flieger

I don't understand not wearing a mask or glasses when using a cutting wheel on and sanding the fiberglass...

He is German, they are impervious to such things.....

[Flieger]

Originally Posted by rattlsnak

why does it take so long to rev up when they go to wide open throttle? Must be restricting the fuel?

No, that is how a real dyno works. They control the brake torque electronically. They control the engine speed by controlling the load on it. This way you can fully map all operating regimes- part throttle and full throttle, steady-state and transient.

[ClickClickBoom]

Originally Posted by rattlsnak

why does it take so long to rev up when they go to wide open throttle? Must be restricting the fuel?

Start with high load to prevent over reving, reduce load to allow engine to reach max rated RPMs under control and measure output.

[BGCarrera32]

Where is he injecting whatever it is in the syringe at 6:00?

[michael lang]

That shop reminded me of the restoration shop at the museum. Clean, very well organized, all business and did I mention clean. They make it look so easy and they have such an abundance of tools. Watching that video definitely helps to understand how some of the things on these engines go together.

[dicklague]

Originally Posted by michael lang

That shop reminded me of the restoration shop at the museum. Clean, very well organized, all business and did I mention clean. They make it look so easy and they have such an abundance of tools. Watching that video definitely helps to understand how some of the things on these engines go together.

Agree. Nice to see a fanatically clean shop.

[NOLAsc]

Any idea why the injectors are at the tops of the stacks when idling but at the heads when running up to speed? (At about 20:45.)

[uwanna]

Originally Posted by NOLAsc

Any idea why the injectors are at the tops of the stacks when idling but at the heads when running up to speed? (At about 20:45.)

Just noticed what you discovered, good eye. Must be two different motors.

[kodioneill]

Originally Posted by BGCarrera32

Where is he injecting whatever it is in the syringe at 6:00?

I was thinking the same.

[kodioneill]

Originally Posted by Flieger

I don't understand not wearing a mask or glasses when using a cutting wheel on and sanding the fiberglass...

No OSHA there. I'm surprised there's no cover over the distributor hole while he's installing bolts and washers on the shroud.

[1200images]

Great video. Thanks for posting.

[Elombard]

Very clever to cut the hole in the back side of the shroud so he can get to the bolt on the back of the intake. Must have done this before :-).

Interesting they run no alternator on the motor (or did they not show it). So they do sprint races on the battery only?

I used to do that on my datsun running SCCA Production racing. Saved a pound and added a horsepower but it was a pain.

[NOLAsc]

Originally Posted by uwanna

Just noticed what you discovered, good eye. Must be two different motors.

I'm not sure they were different motors. The video showed the head-level injectors as well as the tapping of the horns for injectors. I just wonder why they went from one spot to the other -- or why they were placed high at all. Maybe they were placed high just to confirm good flow???

[Flieger]

Testing power difference between the injector location. Porsche went back and forth. I guess these guys figured the low mounted were a little more drivable and didn't give up any power. 956 had an injector pointing against the flow and high mounted if I remember correctly. Needed more time to mix the fuel and air.