Dundon Finger Follower Wear/Cam Wear Fix Update, and Engine Health Monitoring Intro
 

Hello all,

We've received the G.2 Heads and latest revision of cams for us to get final fitment of the finger follower and solid lash adjuster fix.

Looked at the G.2 Heads and there are oil squirters for the exhaust cam and none for the intake. We're going to review adding a spray bar to for the intake side as well to help ensure lubrication. With the lash under control it might be overkill, but it won't hurt...

The heads and cams are all on their way for final measurement. We have to make cams for this kit, so we're going to make a them a bit hotter than stock for a bit more power while you're saving your engine from potential damage. We're also looking at a hot rod head that would include Ti valves and a CNC port on the exhaust side (it's just as cast currently).

Here's some pics:

https://cimg4.ibsrv.net/gimg/rennlis...21c3f16936.jpg
DLC coated camshafts

https://cimg5.ibsrv.net/gimg/rennlis...9082c5768a.jpg
Valves

https://cimg6.ibsrv.net/gimg/rennlis...5273162771.jpg
Exhuast port

https://cimg0.ibsrv.net/gimg/rennlis...1f7407d270.jpg
https://cimg1.ibsrv.net/gimg/rennlis...44de33047d.jpg
https://cimg2.ibsrv.net/gimg/rennlis...9bf089673e.jpg
https://cimg3.ibsrv.net/gimg/rennlis...8329e112f2.jpg
https://cimg4.ibsrv.net/gimg/rennlis...6166e252ca.jpg
https://cimg5.ibsrv.net/gimg/rennlis...0da2c06d67.jpg
https://cimg8.ibsrv.net/gimg/rennlis...26995e73ef.jpg
https://cimg0.ibsrv.net/gimg/rennlis...10bb2ac7e9.jpg
https://cimg1.ibsrv.net/gimg/rennlis...2bdd903b37.jpg

Crankcase Pressure Monitoring System

We're also putting together a crank case pressure logging system with a small logging screen and piggy backing on other work we've been up to decoding the engine computer and car CAN streams to be able to log numerous parameters

Crank case pressure is a vacuum and should stable when the rings are sealing well. As the cam/finger followers wear, metal debris will circulate in the engine and rings and cylinder walls will be worn (as we've seen from pictures from other rennlist members). As the rings and cylinder walls wear the combustion gasses will leak past the rings and the crank case pressure will increase.

The nice thing is Porsche already has a crank case pressure sensor on the car and it can be read with the factory tester. What we're doing is getting the data without the tester and allowing you to log it over time.

The best way to do this is likely at every oil change monitor it for a tank of gas and compare to historical levels. We have all the components including a screen/logger on the way and we're in the final prototype for our CAN decoder. (can do lots of other really cool stuff with the CAN decoder like log brake pressures, ride height for aero development, engine parameters, anything a PIWIS can read we can get and log...)

Just wanted to start a thread to let you know we're working the issue on multiple fronts, both from a monitoring the health of the engine before you get a misfire code, in addition to being able to fix it permanently...

We're testing the monitoring this week, and building the CAN library. More after that!

Great work Jamie, I'll be paying special attention to this thread as many others will also.

LOVE it! Will you also make these for RS?

Great work Jamie. Im really looking forward to following this thread closely.

Just for clarity can you define "G.2" heads and supply a part number for those. I assume these are the very latest heads fitted to the G1/G6 etc swap out crate engines that are now being fitted to cars under warranty?

Congrats on all these developments. Seems very promising. Subscribing.

Absolutely, 991 GT3 and RS

Will grab the part numbers, but yes they are the latest, and the latest cams...
Saw you have a GT4 coming, getting all kinds of toys!!

Jamie,
Great work! The crankcase pressure monitor is an excellent idea for acting prior to major failure. I love it! Also looking forward to the head and cam solution. I will be subscribed.

Good luck with the development and testing phase!

Let's start voiding warranties!!!! Yeah baby!!!!

9A1 104 911 BX

https://cimg4.ibsrv.net/gimg/rennlis...a065ea0b8f.jpg

Makes me regret selling the GT3. :(

Could probably sell the GT4 and get into a used GT3 pretty cheap... ;)

Thinking about it.

Thanks Jamie, will you sell directly to the UK or look for a distributor?

Regards
Fred

Want to know my opinion............?
:icon107:

No idea.:D