Opinions - B18CR Bottom End with Alaniz head

[82911]

point is perhaps that the use of CTR pistons is about to be empirically tested...

Yes, I understand the intention, but the method is flawed. Tested against what? Is the engine builder going to back to back the CTR's against say a wiseco slug?
I think the biggest thing going against the CTR piston is it's weight. It's heavy. The fact that it's dome is large didn't seem to stop the Honda engineers from extracting amazing power from the B16B.
Just a thought.....

[tinkerbell]

Yes, I understand the intention, but the method is flawed. Tested against what? Is the engine builder going to back to back the CTR's against say a wiseco slug?

hmmm, yes, well, i guess it wont be so empirical then will it...

also - the B16B has a very high R/S ratio - 1.8 or higher? maybe the piston weight helped it spin?

or is all extra reciprocating weight bad?

[82911]

or is all extra reciprocating weight bad?

Mostly, yes. Unless you are chasing a smooth idle or building stationary type engines (gensets etc) But you can't race a genset!!!!

also - the B16B has a very high R/S ratio - 1.8 or higher

You are correct, a high rod stroke ratio does offset some of the problems with flame propogation through the chamber. To be specific. It allows the use of less timing and a later spark initiation because the piston dwells at TDC longer but accellerates away faster.

[fatboyz39]

Mostly, yes. Unless you are chasing a smooth idle or building stationary type engines (gensets etc) But you can't race a genset!!!!


You are correct, a high rod stroke ratio does offset some of the problems with flame propogation through the chamber. To be specific. It allows the use of less timing and a later spark initiation because the piston dwells at TDC longer but accellerates away faster.

Thats a little to technical for this site dude All I meant by the B18B comment was CTR pistons with a reshaped combustion chamber it will be interesting to see what this engine does whn its running.

[82911]

All I meant by the B18B comment was CTR pistons with a reshaped combustion chamber it will be interesting to see what this engine does whn its running.

OK, I understand..

But as for being too technical.....
I believe that having good SOLID acurate tech is the only way to refute the internet myths that abound regarding the Honda engines and what does, and does not work.
I appologise if any of it makes your head hurt!!
But ask yourself this.......Don't you want to understand "why it is so" rather than just believe the crap that some other internet "wannabe engine builder" has reguritated from some US based site??? If we challenge the "myths" with solid proven theory then we will find the truth.... That is the advantage that engine builders use over those who run what everone else says works...

does having larger diameter pistons also help flame propagation? or does the long stroke hinder this?

meaning they rely on displacement?

All other things being equal, the larger bore diameter will always make more power.

[ewendc2r]

Thats a little to technical for this site dude All I meant by the B18B comment was CTR pistons with a reshaped combustion chamber it will be interesting to see what this engine does whn its running.

The only way I can see this site ever getting technical is with more posts like this. This is the all motor forum anyhow -- The Tech information is what I love about Honda-tech..

TB -- Even with the clutch on the AC I am assuming there will still be parasitic losses driving the belt etc, maybe I am overestimating them...

........................ Pure curiosity. I've seen stroker 2L kits (bigger stroke) & 2L Bore kits (retainign stock 1.8 stroke). Both achieve same capacity through different ratios, I am assuming that because the bored version squares up the R/S ratio that it is a better option? With the 2L stroke kit, I guess that are then boring and sleeving to get 2.2L ?? (only benefit?)

[tinkerbell]

The only way I can see this site ever getting technical is with more posts like this. This is the all motor forum anyhow -- The Tech information is what I love about Honda-tech..

TB -- Even with the clutch on the AC I am assuming there will still be parasitic losses driving the belt etc, maybe I am overestimating them...

the belt free spins when A/C is off, Honda already got that covered mate!

........................ Pure curiosity. I've seen stroker 2L kits (bigger stroke) & 2L Bore kits (retainign stock 1.8 stroke). Both achieve same capacity through different ratios, I am assuming that because the bored version squares up the R/S ratio that it is a better option? With the 2L stroke kit, I guess that are then boring and sleeving to get 2.2L ?? (only benefit?)

pardon?