This question is very easy to answer. Power wise w/o worry about consumption:
.28 > .25 > .21
As simple as that.

Yeah, I like the idea (and sound..) of higher revs though..

I'm still curious about the 21's though - blue Paloma vs. Elite 8...

Crankpin sizes vary through manufacturers in very small amounts

5.00mm would be very big for nova and barely fit in rod bushing , most novas come new at 4.97-99mm to allow space for lubrication . When a nova crank reaches 4.92mm it is the last time its serviceable (ie. New rod).

hope this helps

Yeah I thought 4.95 sounded a bit small. I checked my p5 after 2 gallons and it was still 4.98. I've got a 15007t with about a quart on it and it's 4.99.

It's not anywhere near 4.99 or 5.00. The actual hole in the rod bushing is 5.00. If the crankpin was also 5.00, you would be unable to assemble the engine, much less run it.

Need a new engine. Mito 4 vs legend 4 wish one would it be better? Running the 4btt/a at the moment.

Sorry if this questions was ask before.

Gaskets
 

Does anyone lubricate their gaskets (motor & pipe) with oil or grease? If so, what seems to work best?

i use shock oil, just a lil to get the pipe to slip over..

Do not use silicon oil. If the oil reaches the glowplug, it will be an insulator for the heat from the plugfilament, and your ngine wont run right before you change your glowplug.

Audi, VW amongst other says do not use silicon liquid gaskets as the residue or fumes can damage airmass meters, oksygen and tempsensors. Use bearing oil or spit.

First off.. don't knock it till you tried it.. you're not bathing the gasket, i just rub a little on it so that the other end can slide over, never had problem... if you have never tried it don't say don't ever do it...

VW also doctored their emission tests.. but hey...

after cleaning the gasket,litle after run oil will not harm anyway

i had a brocken screw inside the novarossi crankshaft yestarday ,it was a chinese screw ,my folt my mistake ,i spended all night drilling the broken screw inside the crank hole and cleaning with a 3mm tap ,finally succes saved the crank .seems like the cobalt drill is not destroing the crank cause its hardened ,if ever hapens to any of you guys just drill it with 2.5 and clean with tap

Thanks everyone. I have been using after run oil too. Was wondering if there was anything else that worked better or was common. I'll stick with aro.

There are two types of silicon gasket, the old type releases acetic acid when drying, the new RTV silicon is sensor safe.

I for one use RTV silicon to fill my cranks... ;)

I also use silicon oil from time to time to lubricate the gaskets, you don't need much.
If I remember correctly silicone oil is inert also.

the silicon that is fitited inside the crank its an other story has nothing to do with the silicon oil like we are using for shocks .for iner use inside use its not good for the engine and its nit a temperature product also .for the silicon ruber at pipes in line and for gasket special product is parker silicon ,its protecting all kind off orings and gaskets to last 3 times more,but still we sould avoid in general that silicon oils are entering inside the combustion chamber,i hope you will not misunterstood my thouths :)