Double roller timing chain question

[Turbo Tim]

I bought a complete engine from a guy at the nats, brought it home and tore it down for a rebuild. When I pulled the timing chain cover off I noticed the timing chain was a double roller and the stock tensioner was gone. My question is, is this correct and if so how much slack should the chain have. If I had to guess I would say the chain had about an eighth inch of slack.

 

[Turbo Tim]

By the way, the engin is only supposed to have 20k miles since the last rebuild.

 

[Butch]

I think that the "Roller" replacements don't use a tensioner, and I have heard that they do get slack in them.

I am not an expert!

Butch

 

[buickboy]

Just went through this at my rebuild. I had a Cloyes true roller double roller chain set in mine for a bout a year. When i tore motor down for rebuild, the chain had significant (1/4) slack but motor never made noise and ran smooth and mid 11's at the time. i had the engine line bored since and installed a Rollmaster undersize set. Super tight at install. Hope it stays tight.
Car now runs very low 11's and is still quite.
Mitch

 

[Butch]

BuickBoy, Did the Rollmaster have an idler?

Butch