1976 TR6 - Part 10 - Degreeing The Camshaft

Let's make our own degree wheel and use it to time the camshaft. What do we need to know about the fine tuning... the short version that is more then enough for us to know in order to time our engine, but also.... the longer version that tears apart the camshaft gear and explains how it does what it does.

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[timmarsh]

Great to have you get to the bottom of how the variation works. I, like you, thought the holes were non-perpendicular, but your new explanation makes perfect sense. Thank you.

[boatboattmmrp]

This is one of those subjects that shouldn’t be hard to understand, but the problem is most other videos out there assume you have a cam card and timing marks. They never actually show you how to degree a cam with math. Your videos were a huge help and really simplified the process and gave me piece of mind.

[PeterStickley]

Many thanks for the explanation at the end - makes perfect sense now.

[davidnicholson]

Your work is SO helpful to me in my restoration of my 3B. Thank you, thank you! Have a merry merry Christmas with your family and a Happy New Year!

[johnclancy]

Elin, another great video and the best one yet on Timing. Not an easy subject in some ways ! Thanks for all of your work

[alanm.]

Good explanations, Elin! Your new and improved degree wheel should help avoid those accidental BDC timing errors! 😊
I never understood why they didn't simply make the duplex cam gear symmetrical from side to side, to allow the 1/4 tooth adjustment with it, too. Maybe they just figured 1/2 tooth was "good enough".
FYI, adjustable (vernier) cam gears are available for both the 6-cylinder (TR6, GT6, etc.) and 4-cylinder (TR2 - TR4A) engines. They are a duplex design, accommodating the double row chains.
Of course, the adjustable gears are considerably more expensive than the non-adjustable... $165-$170 versus $43-$45 at BP Northwest.
Unfortunately, BPNW doesn't offer for Spitfire.
However, Rimmer Bros. offers kits including an adjustable cam gear, duplex chain, and crankshaft gear for Spitfire as well (one kit for Mk 1, 2, 3... another for Mk 4 & 1500).
Rimmer also offers similar kits for the 6-cyl. and big 4-cyl. engines.

[MikeAarset]

I actually really enjoy doing cam timing. I put a race cam in my A-Series 948 bugeye engine. Went through all the steps timing the cam to piston one. Had to use a offset woodruff key to get the timing correct. It was such a joy a couple days ago to start up this engine on my garage floor and it actually started and revved up cleanly.

[graemelliott]

Elin Awesome video! If you eve have enough time get an Alfa Romeo twin cam 4 cylinder engine up to 1995. Each cam is infinitely and independently adjustable at the timing chain sprocket. When setting the timing those engines you can adjust the cams and control when they begin to open & close the valves and control valve overlap as well as scavenging in relation to crank angle. The theory is crazy interesting. All this in a regular production car too. Nuts.

[andrewdonald]

Thanks for producing these videos Elin. I really enjoyed this timing one. Have a merry Xmas and a great new year.

[MrDazvere]

Another great video Elin. Very informative and very well narrated. Merry Christmas to you and your loved ones and a Happy and prosperous New Year!

[tomswindler]

Very nice tutorial on timing, enjoyed it.just continue on with what you’re doing and on to the next video.be safe 😎😎😎👍👍👍

[jackn]

Merry Christmas and a happy New Year to everyone. Another well explained tutorial on an essential skill. Lending tools that never come back, what's the saying, " never a lender or borrower be?"

[BruceBoschek]

First, I guess. 🙂 Looking forward to watching this, as always. Thanks Elin!

[kge]

Not sure why but this is one of my favorite things to watch. @2:30 would that be Dave that borrowed it?

Merry Christmas to you and your family.

[davidwarr]

Another very informative video. After watching your video I am amazed that I ever got the timing right on my GT6 40 years ago when I changed the timing gears and chain. Maybe I didn’t but it still runs well. I was a little worried when I saw you take off the degree wheel and bend the pointer. Why didn’t you loop the chain over the sprocket before you did the alignment?

[philhunt]

Great explanation on how 1/4 tooth is achieved on TR4 but why can't the remanufactured sprockets be made like the originals? Thanks Phil

[MrMikeyspfx]

Thanks Elin your videos never fail to teach us, just curious as to what model tr is on the tv behind you, it looks like a combination of a 3 and 4. Maybe AI ?

[davidsnipes]

Interesting. Those old designers and engineers were amazing. Say, that TR on the screen behind you is making my head spin. The turn signals and running lights and fender shape and grill are like messing with what I thought I knew about the front end of a TR4… or am I missing something? Help me understand that please… well done!