What Gordon said; it also matters what state of tune it's in (and by that I mean how high it was designed to be revved). A 140hp 1776 with a redline of 7,000 or 7500rpm will be a whole lot fussier and less tolerant of things like over-revving and lack of maintenance (you'll be messing with it more, and can probably guess how I know this) than a 22 or 2300 (or even 2400) cc engine making the same (or a little more!) power with a 1,000 or 1500rpm lower powerband. What you will get with the bigger engine is all the power under the curve; all the extra torque from idle up will make it an easier car to drive. You are right- the larger displacement engine won't have to work as hard just to get and keep the car moving.
The bigger engine won't necessarily operate at lower rpm's on the street or highway; that's decided by what gearing is in the car. You can though, gear a car with a bigger engine slightly different, so it runs at a little lower rpm's when cruising at legal highway speeds (guys will do this to run at higher than posted speeds), but that takes experience to do well, and get it wrong and you've destroyed your 5- 6 or $8,000 powerplant. You have to know VW aircooled engines well, and realize that "cruising" is at light throttle so the engine isn't making a lot of heat and lugging it up a hill at the same engine speed will create a lot of heat fast, and be prepared to shift down a gear to get the fan speed up so it will cool itself properly as it's working harder. It also means proper engine monitoring (oil temp and temperature compensated cylinder head temp gauges and the experience to interpret what they are telling you), an extra cooler/fan and adequate air intake into the engine compartment so the carbs aren't robbing air from the fan. Hope this helps. Al
PS- Do you have a first name (and no, I'm not calling you "Sir"...)?
Originally Posted by Bob: 2004 Intermeccanica S. Canada:
I have a 2332 c.c. CBPerformance engine in my Speedster, and it's as reliable as you could ask for, from any engine. Doesn't use a drop of oil, starts cleanly every time, runs smoothly, and pulls like a locomotive. With Weber 48's, I haven't had to adjust the carbs since I bought the car.
Bob- What linkage are you running?