Rokket Horton Explains M96/M97 Porsche 3-Chain Camshaft Timing for 996 & 997 Series of Porsche 911
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- Опубликовано: 29 авг 2021
- Porsche 996/997 Camshaft Timing :
Rokket Horton Explains Camshaft Valve Timing on M96/M97 3-Chain Chain Porsche Engines for the 996 and 997 series of the Porsche 911. M96/M97 Cams are set in the overlap position on cylinders #1 and #4. Overlap is a state of which the Intake and Exhaust Valves are both open at the exact same time. The Valve Timing Overlap starts the Intake Stroke/Charge a few crankshaft degrees early and the Scavenging effect of the Exhaust Gas Velocity draws Cool air over the crown of the pistons, helps cool exhaust valves, as well as several other performance advantages,
Hope this helps anyone struggling with these fairly complex engine builds.....Rokket
Porsche 996 997 M97 Base Camshaft Timing Specs 3.6L 3.8L Made simple
Porsche Camshaft Timing , Porsche Cam Timing, Porsche 997, Porsche 996, Porsche Carrera, Porsche 997S, Porsche Carrera 4S, Porsche Carrera S, Porsche X51 Rokket Horton Porsche Engine Builder 
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Gawd…
I just did this to my M96.23 (‘03)
Thanks for the straight up instruction!
Lots of ‘confusion fodder on this.
Glad that it helped you! I think this video helps explain the process in a manner that makes it way easier to set up the baseline camshaft timing. Cheers
Thanks for a great video and education. I'm in your neck of the woods in Lakeland.
E = Einlass (inlet) , A = Auslauf (outlet ).
Great tutorial Rokket , just beautifull, thank you
Great explanation, great bloke being so helpful. 👍
Nice video
Thank you for taking the time to share your knowledge good video
Thank you so much my dear falla
Thanks your share
Nice video thank you
Nice Job. More videos on the 996!
Hello Rokket! Cheers from Tampa and thank you very much for covering this topic. With all the videos on 996/997 engines out there, everyone else seems to be either vague, or provide confusing information, or skip over the issue. I was in the process of prepping to replace the IMS bearing on my '03 C2, when I proceeded to lock the camshafts and realized they were not perfectly aligned on bank 1 while engine was on TDC (pin in the teardrop hole at the main pulley). They are very slightly off, and therefore can't install the timing install tool. Engine is already out of the car, but whole. Can I still use the method you describe here to adjust them? Would I need to remove anything else other than oil pump for access to the center bolt and 4 other bolts on the timing sprocket and without removing the valve cover? To clarify, my IMS bearing is probably the culprit (oil seep) in the slight misalignment. Car was running when I started the work. But I would like to lock the camshafts before proceeding to replace the IMS bearing. Thanks in advance and best of luck with the channel!
RESPONSE:
Hello and thanks for watching. There are only a few ways that your camshaft timing can be off and it can be caused by different things depending on how off it is.
1) If the IMS is bad, usually there is a catastrophic engine failure and we have all seen the videos of Porsche Guts laying everywhere inside the engine, this will have a significant effect on the camshaft timing
2) Stretched Timing Chains will most likely be slightly off
3) Worn Tensioners or Chain Guides: I see more defective chain guides than any other cause. I have taken engines apart and found the pads of the tensioner/guides broken off and loose in the engine
4) The Cam Phaser (VVT) is defective and may have a broken vane.
5) If the engine was ever apart it may never have been properly to begin with. We had a 911 GT3 brought to our shop (from another shop) and all 4 of the cams were 180` out of phase.
6) If your engine is out of the car, just go ahead and remove the Valve Cover. This will give you the opportunity to at least view 4 of the 6 tensioners and the valve cover should be off to adjust the timing with less chances for an error.
Cheers Rokket 813.605.5500
Thank you very much for the response, Rokket! Yes now proceeding with opening up the cam covers, and kind of hoping to see parts that are in obvious need to replace. I'm guessing 4 out of the 6 tensioners/chain guides are replaceable with just the cam covers ad cams removed. Is that accurate or would I need to disassemble further? (found 2 small brown plastic pieces in the sump). Thank you again for your time. I will try not to take more of it.
Question I am repairing a broken valve spring on #3 left exhaust valve and will be retiming my cams when done, I am debating replacing the springs with new ones since I had a failure and wondered if you had any thoughts on this?
If you have 1- Broken Valve Spring I recommend that you replace ALL of them...Cheers
Hello Rocket, fantastic video on a complex shop manual read but I still have a question. You don’t speak to the cam timing slots not being equal (1/2 moons) so the timing tool only only fits on the cams in overlap but yours seems to fit in compression and overlap. Are my cam journals worn or am I missing a step? Thanks
Hah, a year later I finally figured out that this motor is set up so that both banks are on TDC overlap, for demonstration purposes. That means the cams are shown 180˚ out of time from where they should be for a running engine. So don't make your cams look like this at the same time when you're timing your motor! (posted more for future reference for others)
Thank you very much for the video. I have a question, can the same tool for locking the cams be used on bank 1-3 and 4-6?
Or the tool fits only on bank 1-3 and has to be modified to fit on bank 4-6?
Thanks
Fits both sides
And it’s not for locking the cams, it’s for verifying alignment of the cams. You’ll bend it if you’re not careful and it’ll no longer give good readings
And the tool will NOT fit on both sides at the same time. I don’t understand how they did for Rocket
At 3:45 you state the camshafts should be facing outboard for cylinder #4. "101 Projects for your Porsche 911" says the lobes should be facing inboard towards each other for bank 2 and away from each other in bank 1. Can you help clear that up?
Is that at # 1 TDC on compression stroke? I gave instructions on setting up both banks on #1 TDC. That would be 180’ out of phase on #4
@@HydraulicsTampa it looks like Bentley and 101 Projects both state to time bank 2 (cams on 4 pointed straight in), rotate to U6 (eg not a full rotation of crank) and time/tighten bank 1 from that position.
I read this as you timed both simultaneously by starting with bank 2 pointed out (which requires the cam support brace to open the valves on 5 and 6) and timed both at same TDC, resulting in
Bank 2: cyl 4 cams outwards, cyl 5 intake partially open, cyl 6 exhaust fully open
Bank 1: cyl 1 cams 45 degrees out and down (valves closed), cyl2 intake vertical exhaust inwards (valves closed), cyl3 intake 45 degress down inward exhaust near vertical, valves closed.
Does that make sense? That seems a lot easier, if you can open the cyl5/6 valves with the brace.
(I ask as I have a sealed bank 2 and the cam tool fits in both 180˚ phases, so valve open/close is my only reference without cracking the valve cover off to time bank 1)
hi, i have one question. I have car service, and I work porsche carrera 4s 2007. And i have problem. when the car is warm, a loud bang is heard when starting. we raised the clip, and I have a problem because we can't gear like you did. when we do like you did the car doesn't want to work at all. I hope you have some suggestions on what we could try. thanks in advance
I need more information. Where is the banging coming from? What service where you performing?
@@HydraulicsTampa we are from Serbia
Read the comments. This video is incorrect.
Basically rock 6 and fire cylinder one like any other engine