RS Spec B16 81.50mm and Hastings Rings
 

Hi All,
I Just bought a set of 81.5mm B16 pistons from RS Machines, and the Set came with Hastings Rings Set (2C 4666 020). I'm afraid because of:

On the Rings Box it says: Acura 1834cc 81.00

Are they 81.00mm or 81.50mm?

Please, don't say that they send me Wrong Rings... https://honda-tech.com/forums/images/smilies/emsad.gif

Thanks!

Re: RS Spec B16 81.50mm and Hastings Rings (rikawa)
 

Same problem here!
First off, I hate Hastings rings...
Second, why the hell do they say 81.00 on the box yet in the part number the last set of numbers (020*) is supposed to be .020" or .5mm oversize which is gay! Why not just put 81.5mm where is says 81.00... I guess because that would make to much sense?

The biggest problem I found with these rings is that the end gaps are way off! On a new 81.5mm bore I get .0225" gaps on top and 2nd rings. Factory specs is .008"-.014" for the top ring and .016"-.022" for the 2nd ring. (for stock engines)
I prefer to use a different method for high performance engines.
I use the Bore X method to get the MINIMUM gap, then round it up to the next whole number. (This method is directly from JE/SRP Pistons and other ring manufacturers are pretty close to these same numbers)

Moderate Performace:
Top Ring bore X .0045"
Second Ring bore X .0038" (I use .0045" here too)

N20/Forced Induction:
Top Ring bore X .006"
Second Ring bore X .0045"

And the min. gap for the oil rings is .015 for all applications

Now, using this method here we get the following for Moderate Performance.
TOP RING END GAP
81mm (3.188967") X .0045 = 0.01435 (.015")
81.25mm (3.198809") X .0045 = 0.01439 (.015")
81.5mm (3.208652") X .0045 = 0.01443 (.015")
SECOND RING END GAP
81mm (3.188967") X .0038 = 0.01211 (.013") (Me = .015)
81.25mm (3.198809") X .0038 = 0.01215 (.013") (Me = .015)
81.5mm (3.208652") X .0038 = 0.01219 (.013") (Me =.015)

This is just a GENERAL GUIDLINE!!!

SO, to wrap this up...
Hastings Rings Suck in my opinion!




Modified by Mochanic at 1:59 PM 1/4/2007