Jonathan,
I have run a custom grind high lift cam from Schooner Engineering and
the Isky Z-19 cam with stock Z-S's (except for the needles) and have had
no idle problems (except a little lumpiness) that were cam related. You
may have a vacuum leak and or your carbs may need rebuilding, but if you
are running the Isky Z-19 cam I don't think the cam is your problem. Did
you have the head shaved? Use the shortened push rods? Time the cam
properly? Is your ignition system working properly? Vacuum leaks have
always caused me more idle problems than anything else, and they can be
difficult to track down. I'd start there.
There was a guy at Roebling Road in Savannah a few, well 11 years ago
running a highly modified TR6 with twin 1.75 Z-S's and I assure you his
engine was sucking a lot more air than yours while giving JK Jackson a
run for his money. JK Jackson is partial to SU's, but they are twin 1.75
HS6's, so I doubt that your engine needs more carburation. You might
want to get a second or third mechanic's opinion on your problem.
By the way, if you have the Z-19 cam, the valve lash should be set to
.016" hot. The Z-66+10 spec is .018" hot.
Crazeecooter@aol.com wrote:
>
> Dear List:
>
> I have a problem that has me a bit heartbroken. You see I recently did a
> frame off of my TR6...and did a few things to try to give it some more
> umph...lightened the flywheel a bit, and put in a hotter cam (iskendarian
> cam).
>
> Well I think the cam has screwed me over (or so my mechanic says) because I
> can't get the car to pass california smog emissions. He says the
> hydrocarbons are way up. Also, when hot...my car does not maintain its idle
> sometimes and dies. He does not think this is a result of the lightened
> flywheel. He says my carburetors can't support the cam and thats why I am
> having this problem (Strombergs) He suggests either doing webers (which will
> never pass CA smog..but he says will prevent the car from dying) or going
> back to a stock cam.
>
> We have tried several things to get the car to pass smog as is....set the
> valve clearances as high as 22, as well as running a fuel mixture of 101
> Octane gas and Ethyl Alcohol...to no avail. Could the cam really cause this
> much trouble...or could be it something else...like maybe the carbs need to
> be rebuilt (they don't maintain the oil in the dash pot very well)
>
> As you can imagine...after pouring all this money into the car I am not
> exciting about replacing a cam...or investing in webers...and all around feel
> pretty demoralized. (not looking for sympothy...just venting) So if any of
> you have any suggestons at all about other solutions to the problem...or
> whats the best way to go to new cam...or webers...or something else
> entirely...that would be helpful
>
> Thanks Again:
>
> Jonathan.
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