Timing chain loose?

[87we410877]

I put the comp cams double roller on today just to test fit it and there is about a half inch play in the chain from side to side. This is supposed to be really tight no? Also, my gear that slides over the crank isnt loose on the keyway but isnt tight either. Its a nice smooth fit. I can slide it in and out no problem. Is this normal? Thanks alot.

 

[Steve V]

If you had a line bore or hone you may need and undersized chain. Full throttle sell'em. Not sure about comp cams.

 

[87we410877]

It was line bored. I gues i'll get an undersized one. How do i know how much to undersize? .002, .004 or .006" ? thanks.

 

[Steve V]

Not sure about that :frown: ,Mike at full throttle sell'em maybe he'd know.

Somebody here knows,I bet they'll chime in.

 

[83ttypecooled]

rollers

Hi,
I don't think a roller chain will fit tightly,because you no longer have a tensioner. I understand that you can not use a tensioner with this configuration. Correct me if I am wrong.

 

[87we410877]

I believe you are correct as no tensioner came out of the motor and it had a double roller just not a comp set up. I put that on and it is just as loose.

 

[turbobose13]

Your chain is fine, and the crank sproket is too put the cover on and go.

 

[87we410877]

Your chain is fine, and the crank sproket is too put the cover on and go.

LOL. Im sorry but im going to need a little more info than that with some backup evidence. I have seen SBC timing chains all go on pretty dang tight. So why is it ok to have alot of play in mine? Not to say you dont know what your talking about because i am the one who made the post. But, a little bit of supporting evidence or a second or third person to varify your post, and i'll have a little more assurance. Thanks alot.

 

[101prf]

Why can't you use the tensioner with a double roller chain?

 

[87we410877]

Any takers on how to determine how tight the chain should be? Or should i just order them all and send back the ones that dont fit?

 

[Ormand]

Why can't you use the tensioner with a double roller chain?

The stock pin-and-link chain is flat and smooth on the outside, where the tensioner slides. Many roller chains have "figure eight" links, so that both sides of the chain are wavy, and if the tensioner runs against a wavy surface like that, it will wear out in a few days, leaving junk inside the engine. My experiene with rollers is that they go on pretty tight. Since they sell them undersize, it seems logical that they want them to be that tight. If it was alright to run them loose, why bother to make shorter ones? Besides, if there's a lot of slop in the chain, the cam timing will also be sloppy, as well as the cam sensor readings.

 

[87we410877]

Thats exactly what im thinking. I will start with i guess a .006" and take it from there. I'll post up what happens when it happens. Thanks alot.