Greg wrote,
>What other things did you have to do in order for 8000 rpm not to break
>things. I may consider trying for this but I expect there is some expensive
>mods required. Is 7000rpm going to pose many problems?
8000 RPM engine needs much or all of the following.:
Balance everything.
Cam profiled to the requirement.
BIG valves.
Clean up the ports.
Port match.
Have the crank thouroughly tested before any machining.
Carrillo rods.
Lightened pistons.
Chevy lightened wrist pins.
Lightweight double valve springs.
Titanium valve keepers.
Lightweight custom datsun 510 valves.
Main oil passages in crank dilled and cleaned.
Lightweight flywheel with lightweight clutch (7 inch).
7000 RPMs could use stock rods (get some of Ramons ARP rod bolts),
a cam, some porting, balance and stiffer valve springs.
Anything you can make lighter in the valve train is a good idea.
7000 RPM engine is going to need more carb than stock.
DCOE webers are nice, a 36/36 DGV would be OK.
Puting in oversized chokes (Bill Lewis) in a zenith 36WIA/WIP as well as
larger jets would help out alot.
I wouldnt use the stroms unless I had to for smog.
2500 RPM to 7000 RPM usable range is doubtfull unless your
criteria is that the engine can operate within that range.
In practice a 7000 RPM alpine engine will have a very big hole
below 3000 RPM.
I have what I would call a 7000 RPM on my alpine now, and if you
make the mistake of letting the revs drop below 3000 RPM,
the engine sputters and spits through the carbs. Fuel injection
will fix this, but the engine still doesnt make torque till 3500.
>Why did you use 6 inch and not 5.7 inch chev rods? I measured up for 6 inch
>and thought there was no way I'd find an off the shelf piston that small.
6 inch rods are longer.
Your smokey yunich book will say that you want to increase the rod to stroke
length ratio. Ideally we want an infinitely long rod, but thats not going
to
happen, to we use the longest rod that we can accomodate with pistion pin
height offset. Added benefit is that the piston gets very short and
lighter.
>What is the magic article on the 2000cc rootes engine?
SAOC had an articcle some years back telling of making a low$ high
displacment
rootes engine.
It consisted of Avenger 96mm pistons, some other rootes conecting rod and
alot
of faith in the integrity of your block.
Yielded 1944cc if I'm not mistaken.
What is not apperant though is how do you seal the .180 thou overbore holes
in you block.
Jarrid Gross
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