>Kenneth Brown wrote:
>>
>> I'm in the process having the head rebuilt for my 1968 TR250 and am wonder
>> should upgrade the cam. I don't plan on racing but do enjoy spirited
driving
>> around the country roads. If I do upgrade am I just opening up a can of
worm
>> with idling, timing, emissions (Calif. car) problems etc. Also is it worth
>> money installing roller rockers. I would like to do it once and do it
right.
>> Thanks,
>Ken,
And Joe IV responded, in part:
>some advice~ be warned that a major increase in "duration" is what con-
>tributes to those "can't idle" and "peaky powerband" qualities you seem
>to want to avoid.
>
> The thread a while ago on roller rockers pertained to increased ratio
>roller rockers, which by virtue of their longer length (on the valve side)
>increase the "lift" of the valve. The added benifit, besides the HP gains
>of reduced frictional losses, is that one can increase the vale lift with-
>out having to go through all the trouble and expense of changing the cam
>and lifters.
> In your case, where you are changing the cam already, are not in pursuit
>of the utmost power, and are not considering sustained high RPM running,
>I really wouldn't recomend roller rockers, and living in Califonia as you
>do, I would be leery of modifying the camshaft as well. Sorry to disappoint
>you, but I think the TR 250 has "enough" power already, anyhow...
>
> JOE IV
> TR 250
> WALLINGFORD, CT. USA
>
And my 2 cents' worth is: that if the stock engine is in good shape and
good tune, it's not the limiting factor to your motoring pleasure as much
as the shifter & gear ratios, and suspension limitations...not to mention
the air emissions questions. I'd suggest leaving well enough alone, un-
less you think your car needs to act like a dragster, in which case I'd
recommend finding a car that more fits the bill, like a '69 Chevelle 454.
8*() :-)
Tom Tweed
SW Ohio
TR-250 (just sold)
Enfield .303
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