Don Terrill’s Speed-Talk

The easiest thing to change is the driver.

Erland, Your 2 transfers just above the intake port, where are they leading to : 1) to the intake port, or 2) to their own path of some sort through the jug to the crankcase, or 3) to the combined transfer port cavity in the jug That type of boost port is fed by holes in the piston, just under the ...

Nice article, thanks for posting it here!

Seems like I've heard this story before. Brilliant, foresighted, hardworking innovator with an amazing record of success dies broke.

Who makes the 1.6 roller rockers?

Take a look at the lack of passages surrounding two of the bores. Then look at the Fel-Pro intake gasket for that engine, noting the way it blocks coolant ports. See how the flow is being redirected to the hot spots?

Larry Wiechman

I received my Vizard porting book today. Scanning through it the info looks to be very thorough with many color photos. On page 106 he offers some information on "calculating peak power RPM", unfortunately it seems there may be a typo issue as running numbers for me gives total garbage. S...

Anyone know how to decode the formulas for peak power RPM and port velocities given at the bottom of page 106?
Looks like misprinted gibberish to me.

How big is the motor?

Barbapapa wrote:BTW, are these supposed to be the bike equivalant of F1 or not? The specs read almost like a mass produced 1000cc sportbike with 3 cylinders lobbed off. Not that that's a bad thing.

What do you expect for only $35,000?

Do a Google search on "plastic impregnated aluminum castings". Lots of information about process and providers.
The only downside is that weld repairs are almost impossible after a casting is treated.

Larry

jfn wrote:Has anyone flow tested the screen used in some mass air sensors. Does it restrict air flow and if so how much?

Are you going to use the screen as a flow straightener for a motorcycle carb?

LJW

Sad news.
http://www.profblairandassociates.com/GPB_Tribute.html

What is the best hot tank concoction for removing carbon deposits? I'd like to make a homemade hot tank for cleaning the inside of 2-Stroke expansion chamber exhaust pipes.

Larry

Check into Fortal. Amazing stuff to work with.
http://www.fortal.biz/

Larry