I have a Crane cam in my TR-6 which I set to 0.28 and 0.30 HOT per their
instructions. It is noisy. It produces useful torque well past 6000 RPM (my
red plastic fan shattered at 7000 RPM at the dragstrip but the engine was
unfazed). I am planning to experiment with tighter clearances just to see
if there is a reasonable noise trade off but first I plan to refurbish my
valve train (shaft & rockers) so that everything is tight.
-Erik
At 09:50 PM 10/31/2000 -0500, Scott Tilton wrote:
>Greetings Fellow Triumphers,
>
>I've been lurking and MIA from this list for a long time, and I'm about to
>break the drought with some questions.
>
>I bought a 1970 Triumph TR-6 back on July 4th weekend and have been
>enjoying the hell out of it since then. Actually the Toyota Truck died
>near the same time so the 6 has been my daily driver.
>
>In addition to commuting to work, it has been through the VTR regional
>here in Richmond, (autocrossing is FUN!!) went to events in northern and
>western Virginia, even went down to Euro 2000 autofestival at the BMW
>plant in South Carolina. All in all I've put about 5000 miles on it since
>getting it. All without a safety net (spare working car), nor even a cell
>phone. (that's not exactly true. . . my wife has a cell phone and I can
>borrow a car if I really need to)
>
>I'd love to hear that I'm not alone in my daily use of a LBC . . . it
>would make me feel a little less crazy. Let me tell you though, there is
>nothing like necessity to force action.
>Depend on your LBC for transportation and you'll find time to work on it.
>
>It was probably the dependability of the Toyota for the last decade that
>put my TR-4's into deep comas.
>
>Okay Okay . .so get to the question already Scott. . .
>
>Valve clearances:
>
>This TR-6 has some performance / hot rod goodies on it, one of which is an
>older performance camshaft. It was probably bought and installed in the
>early to mid 1980s.
>The former owner sent me the spec sheet on the "PAECO Superlift Camshaft"
>and pointed out the non standard valve clearances . . . it says
>
>Intake Lash .018"
>Exhaust Lash .020"
>
>If memory serves me correctly stock is .010"
>
>Does this seem pretty excessive to anyone else?
>
>I'm wondering what the theory is behind valve lash.
>I thought it was there because there was potential for thermal expansion
>and the valve stem could actually lengthen a tiny bit and the relative
>geometry between the rocker and the valve stem would change.
>
>Wouldn't want the engine to heat up and the valves not fully close.
>
>Well . . . if that was the theory . . .what in the heck would make a valve
>stem get that much hotter and grow in length that much more?
>
>Maybe they think I'm going to run the thing at 6500 RPM. (I drive it
>hard, but not that hard)
>
>
>Currently I'm fudging. . . the valve clatter sounded very loud with .016"
>and I adjusted it down a bit.
>Am I being stupid?
>
>Anyone got some tech tips on the right way to adjust valve clearances?
>
>
>Finally, while recently reading the story of
>
>The "Diner" TR3 gets back on the road
>
>(John Lye's and Chris Kantarjiev's journey to Savannah which I recommend
>reading: http://www.dimebank.com/Diner.txt )
>
>I saw the following:
>
> >We used one of the Clikadjust tools, which is truly a miraculous device.
> >Set all 8 valves in about 10 minutes.
>
>Yeah I know John and should ask him myself. . . . but . . .
>
>Does anyone know what a Clickadjust tool is?
>
>Thanks in Advance
>
>Scott Tilton
>In Richmond Virginia (for a little while longer)
>With TR-4 parts all over the place
>And a TR-6 that's going all over the place.
>
>
>
>
--
Erik Quackenbush, V.P. Operations, Midwest Filter Corporation
1-847-680-0566 fax: 1-847-680-0832 http://www.midwestfilter.com
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