[cnc]

Ok another question
How does one go about measuring the length of chain u need ....whether it be standard.... or .005 or
.010 shorter......

[track73]

I got this from Rollmaster
HOW TO DETERMINE TUNNEL BORE SIZES
AFTER FITTING YOUR STANDARD ROLLMASTER TIMING CHAIN SET TO THE ENGINE YOU NEED TO
PINCH WITH TWO FINGURES THE CHAIN HALFWAY BETWEEN THE CRANK AND THE CAM SPROCKET
ON THE RIGHT HAND SIDE.
WITHOUT FORCING OR PUSHING HARD JUST MOVE THE CHAIN BACK AND FORTH AND NOTE THE
AMOUNT OF MOVEMENT.
USE THIS FORMULA
1/4" = .002 TO .004”
5/16” = .004 TO .006”
3/8” = .006” TO .008”
1/2” = .008 TO .010”
THESE SIZES ARE THE AMOUNT OF THE OVERSIZE YOU NEED TO ORDER TO OBTAIN THE BEST
POSSIBLE RESULTS FOR CHAIN FITMENT.
**HOW TO ORDER AN OVERSIZE OR LINE BORE TIMING SET**
ADD TO THE STANDARD P/N THE OVERSIZE YOU FOUND FROM THE DEFLECTION MEASURED .
EXAMPLE CS1000-006
THIS INFORMATION INFORMS ROLLMASTER THAT YOU NEED A SMALL BLOCK CHEV SET THAT IS
.006 THOU LARGER ON THE CAM SPROCKET.
ROLLMASTER SUGGEST THAT YOU KEEP ONE STANDARD TIMING SET FOR REFFERENCING EACH
ENGINE TYPE YOU USE.
THE SIZING OF OUR STANDARD TIMING SETS WITH IWIS CHAIN WILL NOT VARY AS EACH SET IS
MATCHED PAIRED FOR EXACT CENTER TO CENTER DISTANCE.
THIS WILL ALLOW YOU TO MAINTAIN A CONSTANT RELATIONSHIP BETWEEN STANDARD CENTER
TO CENTER DISTANCES AND LINE BORED BLOCKS.
HOW DOES THIS WORK AND WHY ?
WHEN YOU MACHINE THE ENGINES MAIN BEARING TUNNEL THE DISTANCE BETWEEN THE CAMSHAFT
AND THE CRANKSHAFT CAN BECOME CLOSER CAUSING A STANDARD SET TO FIT WITH
SLACK IN THE TIMING CHAIN.
ROLLMASTER SOLVES THIS PROBLEM BY MANUFACTURING SPROCKETS SLIGHTLY LARGER IN
THOU INCREMENTS. THE LARGER SPROCKETS ARE SIMILAR TO ENGINE BEARINGS BEING THICKER
FOR CRANKS THAT HAVE BEEN GROUND. THE RESULT IS THE LARGER SPROCKET TAKES UP THE
SLACK IN THE DISTANCE BETWEEN THE CRANK AND THE CAM AFTER MACHINING.
DO NOT USE CHAINS THAT CLAIM TO HAVE SMALLER PITCHES AS THESE SOON WEAR AND YOU
END UP WITH A POOR FITTING TIMING SET VERY SHORTLY AFTER.
DO NOT MIX AND MATCH ROLLMASTER TIMING SPROCKETS AS THESE ARE MATCHED PAIRED.
ROLLMASTER LISTS FACTORY CENTER TO CENTER DISTANCES FOR MOST POPULAR ENGINES ON
THE FRONT PAGE OF THIS WEB AT THE Sprocket Data Button.
THE INFORMATION SUPPLIED HERE IS A GUIDELINE ONLY. USER DISCRETION IS REQD.

[grivera]

Originally Posted by track73

I got this from Rollmaster
HOW TO DETERMINE TUNNEL BORE SIZES
AFTER FITTING YOUR STANDARD ROLLMASTER TIMING CHAIN SET TO THE ENGINE YOU NEED TO
PINCH WITH TWO FINGURES THE CHAIN HALFWAY BETWEEN THE CRANK AND THE CAM SPROCKET
ON THE RIGHT HAND SIDE.
WITHOUT FORCING OR PUSHING HARD JUST MOVE THE CHAIN BACK AND FORTH AND NOTE THE
AMOUNT OF MOVEMENT.
USE THIS FORMULA
1/4" = .002 TO .004”
5/16” = .004 TO .006”
3/8” = .006” TO .008”
1/2” = .008 TO .010”
THESE SIZES ARE THE AMOUNT OF THE OVERSIZE YOU NEED TO ORDER TO OBTAIN THE BEST
POSSIBLE RESULTS FOR CHAIN FITMENT.
**HOW TO ORDER AN OVERSIZE OR LINE BORE TIMING SET**
ADD TO THE STANDARD P/N THE OVERSIZE YOU FOUND FROM THE DEFLECTION MEASURED .
EXAMPLE CS1000-006
THIS INFORMATION INFORMS ROLLMASTER THAT YOU NEED A SMALL BLOCK CHEV SET THAT IS
.006 THOU LARGER ON THE CAM SPROCKET.
ROLLMASTER SUGGEST THAT YOU KEEP ONE STANDARD TIMING SET FOR REFFERENCING EACH
ENGINE TYPE YOU USE.
THE SIZING OF OUR STANDARD TIMING SETS WITH IWIS CHAIN WILL NOT VARY AS EACH SET IS
MATCHED PAIRED FOR EXACT CENTER TO CENTER DISTANCE.
THIS WILL ALLOW YOU TO MAINTAIN A CONSTANT RELATIONSHIP BETWEEN STANDARD CENTER
TO CENTER DISTANCES AND LINE BORED BLOCKS.
HOW DOES THIS WORK AND WHY ?
WHEN YOU MACHINE THE ENGINES MAIN BEARING TUNNEL THE DISTANCE BETWEEN THE CAMSHAFT
AND THE CRANKSHAFT CAN BECOME CLOSER CAUSING A STANDARD SET TO FIT WITH
SLACK IN THE TIMING CHAIN.
ROLLMASTER SOLVES THIS PROBLEM BY MANUFACTURING SPROCKETS SLIGHTLY LARGER IN
THOU INCREMENTS. THE LARGER SPROCKETS ARE SIMILAR TO ENGINE BEARINGS BEING THICKER
FOR CRANKS THAT HAVE BEEN GROUND. THE RESULT IS THE LARGER SPROCKET TAKES UP THE
SLACK IN THE DISTANCE BETWEEN THE CRANK AND THE CAM AFTER MACHINING.
DO NOT USE CHAINS THAT CLAIM TO HAVE SMALLER PITCHES AS THESE SOON WEAR AND YOU
END UP WITH A POOR FITTING TIMING SET VERY SHORTLY AFTER.
DO NOT MIX AND MATCH ROLLMASTER TIMING SPROCKETS AS THESE ARE MATCHED PAIRED.
ROLLMASTER LISTS FACTORY CENTER TO CENTER DISTANCES FOR MOST POPULAR ENGINES ON
THE FRONT PAGE OF THIS WEB AT THE Sprocket Data Button.
THE INFORMATION SUPPLIED HERE IS A GUIDELINE ONLY. USER DISCRETION IS REQD.

That's interesting. If 1/4 inch slack isn't acceptable, how much is? 1/8"?

[cnc]

cool info thanks