Question about boring

[t3/t4eclipse]

I am sending my block out to get cleaned and bored to fit the new ross pistons. My question is since cylinder #1 tends to be the hottest do I want to get the clearence in the hotter cylinders to be a little bigger to allow for a tad bit most piston expansion. I was just wondering if anyone has bored the hotter cylinders a little more than the others and if so about how much more? I just figured Im going all out on this build might as well cover all the bases and get some deeper info.

 

[t3/t4eclipse]

My bad I was thinking boring for some reason. But what are you talking about fuel system and assumption. Im building a whole new motor and my fuel sytem is a walbro 255 pump, aero afpr, ss lines on every inch and a dsmlink to manage it all what assumptions are you talking about. Did you even understand my question? On most motors they find the hottest cylinders and HONE them out just a tad bigger to compensate for the increased heat and therfor increased piston expansion. My question to people that thought that out and tryed it was how much bigger they went in those cylinders. I thought that there was always a hotter cylinder regardless of fuel system components. Hence tapping cylinder 1 for the egt probe. ???? Hopefully someone with more experiance than me or you will read this thread. - no diss by the way I understand where you are coming from.

 

[TSIfreek]

Cylinder#1 doesnt get so hot were the bore size needs to be increased to compensate. I have never heard of anyone doing this. As long as your A/F ratio is correct you wont have any problems.

 

[project_tsi]

Actually #2 cylinder runs the hotest. B/c of the designs in the intake system, #2 runs between 50 and 150* hotter.

Although boring or honing the hottest cylinder out a tad more is not benificary.

 

[Defiant]

On most motors they find the hottest cylinders and HONE them out just a tad bigger to compensate for the increased heat and therfor increased piston expansion.

35+ years at this, and I've not heard of this practice. The amount of difference you'd need could only be measured in a lab.

 

[t3/t4eclipse]

Thanks for all the replies