>Yeah, I realize 150hp is pushing it without magic crankshafts etc as I
don't
>think 8000 rpm will be in my budget. But I thought I'd aim for this
>initially to see if anyone had any encouraging formula. I think 130 to 140
>will be more realistic. I race hillclimbs and motorkhanas too as well as
>circuit, and a wide power band will also be necessary.
>Turbo, eeeeeek. But I am intending to stroke and bore to about 1950cc. I
>don't want to overbore and be blowing head gaskets all the time so I'll
>stroke and use 1592 cc rods or maybe chev rods (2 inch bearings also). I
>haven't finalized this yet. There may be some cheap light japper rod that
>will do the trick. Any ideas? It would be good to keep the bore to 80 thou
>over max so I can use standard head gaskets, but I've been talking to
>someone in Aus who is running 2100cc which sounds pretty yummy. He says it
>runs real sweet too. I'll get the details and pass them on if anyone is
>interested.
Well, 130 to 140 BHP is still going to need some revs.
The 2 liter engine you describe will still need 7000 RPM to make your
140BHP.
Wide power band and 140 BHP wont come in the same package, sorry, we
only have two valves here.
I have used 6.0 inch chevy "carillo" rods with with 2.0 inch journals, and
7/16 inconel cap screws. Certainly a way to make a bulletproof bottom
end, but then again, I was building an 8000 RPM motor. This also BTW
make for some VERY short and rather lightweight pistons.
The rods although many times stronger, and .365 longer still weighed in
less than the stock pieces.
I looked into the big bore thing a while back, and it looked to me that
bores beyond .060 were beyond what I would call an acceptable sealing
area on the head gasket.
This means you will need over .5 inch stroke (.250 offset grind) to get
from 1725 to 2000 CC.
Many of us have read the magic artical on making the 2000cc rootes engine,
but nobody has ever told us what the author used for a gasket.
I calculate the one could attain 1856cc with a .080 overbore (if it seals),
then with a .200 stroke (.100 offset ground), one can attain a 1913cc engine
within the confines of what CAN be done with a factory head gasket, and
the amount of meat on the crank.
Jarrid Gross
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