I mean, how long do you think a 9k redline engine could possibly last long term? I Want the F20C engine really badly but I just think that realistically, the 2.2 engine would last longer in the long run because it's less wear and tear. What do you guys think? Im' talking about driving the car to it's max all the time. Valve springs at 9000 RPM vs. valve springs at 8000 rpm....do you think that extra 1000 RPM will make a difference?

 

piston speeds are probably the same when the f20c is at 8900 rpm and the f22c is at 8000 rpm. engine wear and tear should be similar on both engine @ redline.

 

IMHO the engine will be destroyed by a driver mistake long before it dies on it's own.

 

Yup, like he said. due to the change in stroke (i think it was the stroke?) the piston speed and stress on the bottom end on the F22 is the same at 8200rpm as the F20 at 9000rpm.

Either way, I don't see why the F22 would outlast the F20 and vice versa. Both were built with redlines for a reason, and both were built to honda's tolerances.

 

Sorry for my stupidity or ignorance, but please explain how the stroke difference changes the stress on different engines at different rpm's (I'm actually really curious, not challenging at all). Thanks.

 

take for example the following formula which calculates piston speed (in feet per minute):

P = (S * R) / 6

Where:

P = Piston Speed in feet per minute
S = Stroke in inches
R = RPM = Revolutions per minute

As you can see, the higher the stroke, the higher the piston speed at a given rpm.

 

F20C - 84mm stroke, 8900rpm = 81.76 fps average piston speed
F22C - 90.7mm stroke, 8200rpm = 81.34 fps average piston speed

Hardly any difference. So in terms of cylinder wall wear, I don't think one or the other will be noticeably more reliable. Design considerations like oiling setup and the like will have a much greater effect - redline, not so much.

 

hmm, very interesting. thanks for all the information. So with all this said, why wouldn't anyone want the F22C engine? (besides a lowered redline) the F22C seems to have more potential when it comes to tuning. And 30-50 MPH, 50-70 MPH, acceleration is faster than the F20C. Is this all pretty much true? I guess, what are the pros and cons in a nutshell? thanks!

 

Hello, I'm really interested in this topic. I'm planning to buy this car soon. Is this the type of engine I could depend on to get me 150k miles solid with out having major problems and hp loss issues? I drive an Audi and all though I

 

Because, unless you want to buy one seperately, you have to get it with the AP2 chassis and many still prefer the AP1.