Changing Horses in Mid Stream....

[Guest]

I canceled my order for a new GP2 cam (had to pay full price anyway) and ordered instead Ted Schumacher's S2 cam with hardened cam followers. Very similar grind. Sending the head off to get the valves reworked and passages cleaned. Will stay with the roller rockers and nix the auxiliary oil line to the head.

Should be good to go in about 3 weeks, might make the New Orleans show.

 

[TR6oldtimer]

Hmmm, let's see, higher lift, longer duration, peak power range moved to higher rpms. Looks to me to be closer to the GP3 cam. Putting a little lope in your life?

Do you need to re-curve the distributor?

This will be cool.

 

[DrEntropy]

Wash or better, replace the chain while you're in there, too. Can you envision checking a few of the bearings? Especially the thrust side (upper) of the rods.

 

[vettedog72]

Bill
That makes good sense.

 

[2wrench]

Interesting, Bill, very interesting.
Sounds like fun. Anybody got one of these
cams?

You figure you'll feel it at idle, Bill, or is
this one soft enough that it won't be that bad?

Do ya figure the auxillary oil line actually did any
diservice to ya considering your present situation?

Heard said by some to have all the blood shooting to
the crank is their preference. I just don't really
know. But if you had any reason to suspect that
auxillary oil line, it would be cool to hear about it.

Best of luck and keep on drilling.... I mean, wrenching.

 

[Guest]

2Wrench, Ted Schumacher sells the cam and it is a bit more radical than the GP2 cam. There will be a noticeable lope, but at my age, any lope is a sign that I am still alive.

Ted was the one that was emphatic that I take that auxiliary line off, said is was doing more harm than good.

 

[DNK]

Interesting, Bill, very interesting.
Sounds like fun. Anybody got one of these
cams?

I have 1 in mine never been started yet

Do ya figure the auxillary oil line actually did any
diservice to ya considering your present situation?

Heard said by some to have all the blood shooting to
the crank is their preference. I just don't really
know. But if you had any reason to suspect that
auxillary oil line, it would be cool to hear about it.

Ted's not a real fan the the aux line.

 

[LastDeadLast]

Bill,

Don't know if you've seen these yet, but from Moss's new products section:

https://www.mossmotors.com/Shop/ViewProducts.aspx?PlateIndexID=66149

 

[Guest]

I wonder how much they are from APT direct.

 

[2wrench]

By Gucci?

 

[2wrench]

Gotcha, Bill. Maintaining/increasing lope is a
constant battle for we who qualify to order off the
Senior Menu.

 

[LastDeadLast]

Yeah.. Moss is usually the most expensive for stuff like this. I would be surprised if you couldn't get them from APT much cheaper... but "You gotta pay to play!"

 

[martx-5]

What's the diameter of the TR6 tappets? The ones I bought from Ken at BF&E for the TR3 motor are phosphated with the drain hole, and are $11 each. They are 0.937" (or something close to that). He also has them in 0.875". Curious though, he doesn't list tappets for the TR6.

 

[LastDeadLast]

Something slightly off topic but very related to Bill's engine failure, but what would it take to engineer roller lifters for the TR motor. Just curious.

 

[Brosky]

The lifters are not on APT's website as of this afternoon. It says they are coming, but not posted yet.

The TR6 lifters are 0.800" if I remember correctly.

I'm curious to know if these have a radius on the bottom and what it is. They are coated for break in so that's a good thing. Now to find a matching cam and all will be well.

Maybe......

 

[Guest]

Paul, the APT website hasn't been updated since 2003.
They operate by catalog and phone...

 

[Guest]

Having called pretty much all over the country about my revolting development, the scary part is the comments I am getting from different vendors, both large and small. From such things as, "Gee, that's the first time I've seen that happen." (which I don't believe) or "They don't make them for the TR6." or "They are back-ordered and should be in by mid March." or "The other guy's stuff is pure junk." (Won't even touch that one)

The bottom line is I am beginning to believe a truth, that cam followers are not what they either should or used to be. And I am not too sure about other parts.

 

[Brosky]

Shannon,

A good mechanical design engineer, with an automotive drive train background could do the design on his/her CAD system in about two hours, tops.

The problem would be getting a manufacturer willing to tool up to machine them and assemble them as matched parts, then to sell them at a price affordable to a market of about 20-30 nuts like us.

Not much incentive or margin of profit in that business plan.

 

[70herald]

Shannon,

A good mechanical design engineer, with an automotive drive train background could do the design on his/her CAD system in about two hours, tops.

The problem would be getting a manufacturer willing to tool up to machine them and assemble them as matched parts, then to sell them at a price affordable to a market of about 20-30 nuts like us.

Not much incentive or margin of profit in that business plan.

I have been mulling this over for a while, and have come to the conclusion that the most likely way for this to succeed would be to find an existing roller, which is slightly smaller diameter than the 0.8" TR tappets, maybe from some Japanese or European engine? If they are smaller it would be quite simple to get some sleeves made up for the current bores. Length of the lifter wouldn't be a real problem since there are already sources for custom made rods so any length could easily be compensated for.
The American V8s all use much larger diameter followers. To bad since they are so readily available!

 

[LastDeadLast]

Well, with the American v-8 design, most come in pairs and are connected at the top by a hinged bar:

I always assumed that this design kept the roller lifter from rotating and thus keeping the roller correctly positioned on the cam.

If I remember right (it's been 3 years), aren't our tappets completely inserted in a hole? How could you keep them from rotating? The answer might be simple, I just can't remember the engine design that clearly right now.

But gosh it would be sweet if it could be done. Think of the interesting cam profiles that could be used!