POLO 4 cylinder 911 engine and 1967 912 almost done

[Chris Pomares]

Drew and I spent close to an hour looking at each others cars at LUF7 in San Diego. He is a very nice young man and a wonderful fabricator. We're both very fortunate to own these cars. The best of everything Porsche.
It would have been great to grow up in a family like that with those fabrication skills. I have to outsource bodywork. Fortunately I have access to some good guys.

https://youtu.be/Rmwvs3EKzbQ

[Chris Pomares]

I've been reading up on 1973 to 1975 Dino 308 GT4's. Does anyone own one?

[Rick Cabell]

After watching the whole video, I didn’t hear whose motor it is. Polo? Rothsport? A masterpiece for sure.

[Chris Pomares]

The engine is a Chuck Beck build from many years ago. I think he built 2 POLO/Rothsport type engines. They where both 6's with the center part of the cases removed and welded together. I think Drew had the engine disassembled and freshened. My engine sounds different. Actually most sound different as most of us have used different exhaust systems.

[Chris Pomares]

I just went from 42# 440cc injectors to 36# 380cc injectors. I think I could have gone to 30# 315cc injectors. All are Bosch. The engine ran somewhat rich at idle and throttle tip in and I had to pull fuel. It still is but not to the extent as before. My goal is to run 0 adjustment rich or lean at idle after warm up, then adjust fuel curve after that. It's the anneal quest for perfection. 28mpg from Rennsport to Denver at 70 to 90 mph. I want 32 to 34 mpg at 14.5 afr under light load at 80 mph. At 80 mph on flat terrain with light wind I only need to depress the throttle maybe 3/8ths of a inch. Torque comes in handy when cruising cross country. At 80 mph and the afr adjusted correctly I won't pick up mileage when cruising. It's the better throttle tip in and low load metering that will save some fuel I hope. Time will tell. Under full load the 4 50mm throttle bodies can suck fuel crazy. But that's usually when I smile the most.

[mepstein]

Drew’s Beck engine was built before there was a polo/rothsport 4 cylinder engine. Actually, it’s the only true Porsche engine of the bunch (modified of course). The other engines use a Porsche type design but are aftermarket cases. No porsche serial numbers.

[Chris Pomares]

Dean sold a 912 turbo engine he had in a Speedster to the Emory's. Now what? He had a Mag case with a rod sticking out that had no future as a running engine. He cut it up to make a buck to see if a 4 cylinder 911 case would fit. It did. Now what to use for a running engine?
The first running POLO was based on a 3.2 Carrera motor as explained in the top link article, down a ways next to THE DESPERADO 356. It was put in the Desperado and driven by Milt Minter. New cases today are freshly cast out of a Aluminum/Titanium mix, with 5 main bearings and a very short non flexy crank. The bottom end is VERY strong. I suspect 911 cranks flex very little if at all.
I was on the phone today with Dean for 30 to 45 minutes. He is as busy as ever.
My engine has 27,000 miles on it and running just fine. Dry as a bone. No oil leaks. As to who built the first one I can't say. Dean stayed with the project and I'm glad he did. Oh, and the Emory/ Rothsport engine is also very fine indeed.

https://www.doubledeclutch.com/?p=9881

https://www.early911sregistry.org/fo...O-4-Type-930-4

[Chuck Miller]

I was at Willow during one of Milt's DESPERADO tests .....

It had most unholy buzz-saw howls I ever heard from any Porsche of any cylinder configuration...AND, it was HAULING ASS !!!

[Chris Pomares]

Chuck, my understanding is POLO #1 when the crank was cut and welded up, it ended up being a flat plane crank. That could account for the wild sound.

[Chris Pomares]

This is a picture of a drive I did last week. We're supposed to get more mild Colorado weather in the high 40's to low 50's between Christmas and New Year. It's been a slow start to the ski season so far. For those of us around Denver it's a driving season that just keeps going.