On Fri, 17 Jan 2003, "Rick Behning" wrote:
> wondering what the implications of running the rover on
> unleaded are?
Converting the head for unleaded fuel use requires using
good quality exhaust valves (oem rover = "stellite", after
market = stainless) and hardened exhaust seats. An
automotive machine shop can do this relatively
easily/cheaply. What has most likely happened, in the case
where your engine is stock, is that the exhaust valves have
cracked and the exhaust valve seat has "fallen", or been
miss-shapen by the the pressure of the valve closing. The
lead in fuel helped this by cooling and lubricating the
exhaust valve on it's way out. You can still get a product
called "instead-o-lead" but you probably won't find leaded
gas in North America anywhere.
> So I could go 33"x15x9.5 but
> I am wondering if the extra inch or so is going to greatly
> impact the performance offroad.
My neighbor runs these on his stock 69 88. Pretty noticable
difference in highway speed power, but not noticable in 4lo.
Basicly, you end up bouncing around gears more than normal
when you're on a long steady climb (like a mountain pass),
but off-road they'll be great. Obviously there is an effect
on the drive ratio, but off-road the series trucks have
plenty of low gear. He ran the tires with his stock springs
and they lightly rubbed from time to time. He went to Rocky
Mountain Parabolics a few years ago and the tires stay way
clear of the truck now. I wouldn't say that the 33-9.50's
are a clearance problem on stock springs though.
Bryan
62 88
70 109
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