Well, Rick....as Kevin points out, your induction set-up will probably be the
limiting factor re: your application.
You could use a little more compression with this profile, Rick. Say about
9.5-10.1. Go to 19cc combustion chambers on the head with the stock 8.8-1
pistons and that
should put you right in the ballpark in this
respect. At this point, a larger 1.4" inlet would be a nice option as well.
That should about do it, assuming you have
93PON (Citgo, Sunoco or whatever) in your
area.
The less compression you have, the less
"snappier" response will be off the line as
with the wider duration/higher lift cam,
the "trapping efficiency" below about 2.5K
won't as great at 8.8-1 as it would more tightly "squeezed" at the higher
9.5-10-1 CR.
Thus, if you stay at 8.8-1 (octane availability or for whatever reason) the
relatively small throats of the stock SU's will be helpful in ameliorating this
phenomena by keeping
mixture port velocity on the high side at
lower rpm's, with a loss to some extent at
the top end (4.5k+-), using the stock intake valve size.
If you go up on compression, the smaller throats won't be needed for this, the
larger
1.4 intake valve could "produce" and you
can start thinking Weber DCOE, dual 1.5"
HS4's or better yet (depending upon your
point of view:), the very (daily driver)
user-friendly single 1.75" HIF44 set-up (set
it - fogetaboudit....no screwing around with
synchronization, etc.).
Either SU set-up won't have the potential
for immediate (correctly tuned) DCOE off-idle response, but once off the
line, you'd be hard pressed to tell the difference between carb applications as
torque builds with rpm using this strong
mid-range cam profile.
If you want to enhance the profile of the
cam, you simply go to 1.5 ratio rockers.
Or you could take a half-way step in this
respect by going to a true 1.3 rocker ratio
by picking up the MiniMania "improved"
stock set-up (also having improved pedestals for less "side to side"
force...saves on valve guide wear over time/miles).
As Kevin says....make sure the radiator is
in good condition and the addition of the
greater blade pitch, lighter multi-bladed
plastic fan is also very helpful in keeping
operating temps. reasonable.
As is the use of the later "deep impeller"
water pump and larger diameter Cooper
S water pump pulley if it really gets hot
under there.
A good exhaust size with your basic "med.
bore" LCB type header should be 1.75".
Have fun! :)
Cap'n Bob
Basic Frog
Cap'n. Bob '60 :{)
|