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#5196 - 07/17/14 05:20 AM Timing chain stretch
1930 Offline
journeyman

Registered: 06/06/14
Posts: 96
Looking at videos on-line about checking for it and I see steps like turning engine whilst viewing rotor and approximating how long things take to coincide but I am not sure this is the best approach.

Anyone here have any suggestions on the best way to check for this to determine an unacceptable amount of slop?

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#5197 - 07/17/14 05:21 PM Re: Timing chain stretch [Re: 1930]
CNC-Dude Offline

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Registered: 01/22/10
Posts: 1150
Loc: Parts unknown
To have any slop is going to introduce timing inconsistencies regardless of how little it is. It will be a personal preference on how loose you feel comfortable in letting it get before you change the timing set. If the timing cover is removed and you can grab the chain on one side with all the tension taken out of it between the crank and cam, it should be pretty snug and not be able to be pushed in from the side or pulled out.

Some engines are the interference type, and if the chain gets too loose you can have piston to valve contact if its too sloppy.
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If you never are the lead dog....the view doesn't change!

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#5203 - 07/18/14 09:17 PM Re: Timing chain stretch [Re: CNC-Dude]
Nexxussian Offline
addict
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Registered: 01/26/10
Posts: 600
Loc: Alaska
At one time someone was making a chain tensioner for the SBC, basically a spring loaded shoe that pulled on the "slack" side of the chain.

I've wondered if anyone else made a retrofit like that.

I know it would retard the cam as the chain wore, but it should reduce or eliminate any flutter.
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#5205 - 07/19/14 05:50 PM Re: Timing chain stretch [Re: Nexxussian]
1930 Offline
journeyman

Registered: 06/06/14
Posts: 96
Ok thanks for the replies guys. Im going to get more into this in the near future so at least I have a starting point.

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