Don Terrill’s Speed-Talk

It def would make power

If there were no errors, how does power increase?

I must admit I'm somewhat surprised.
Frequently, such effort on my part is met with one of the following.
1. "You're wrong"
2. "I already knew that"
3. "It's not relevant to the original post"

Bultaco 250 moto-X 2-stroke

Because of the shallow SLR, some of these combinations will knock at low RPM in traffic, where an auto trans would not.

Intake is low because heat rises.
Way back, small race bikes didn't use a pump, the natural thermal action provided sufficient cooling.

Trigonometry may also supply another minor data point. The piston motion near TDC is relatively mild in terms of motion per degree of crankshaft rotation. The range will be linear to the stroke length, but also track "n" (the connecting rod to stroke ratio). Very low "n" values (...

(Continued from above) To calculate the lateral (scrub) movement (L): L = (Sine of valve stem angle) × lift change Sine 26°= .438 A BBC intake valve valve moving @ 26° from .100" open to contact at .200" (dial on the stem) will track across the dome by .044". If you had only .060"...

The optimal shape of the valve relief in the dome will vary. An engine with vertical valves (parallel to the bore axis) will display a perfect concave disc (a short cylinder, with its diameter exceeding the valve head diameter by a safety & flow enhancement distance, and the height the relevant ...

Heat energy is lost in the exhaust plumbing

What kind of car you buy is being decided by the people who supply the components.
Spelled C H I N A

know how much that affects the core
The lobes are in different clock positions.

IDK, have you investigated Dynamat?

Apparently, no one has noticed the many, many nearly stock LS engines with single turbo passing 1,000 hp...?
Google "Precision" to see what size you need.

I've wanted twins for many years

#1 reason for anything but a race car: to talk about it.

What's your reason for making it more expensive, complicated, and heavy?

I have twins on my 2JZ-GTE Lexus but they're factory.

It was discovered, painfully, 50 years ago that VW Type I (beetle) engines running heavier than 20 weight blew up.
The heavy oil didn't carry away heat from the bearings fast enough.