Can you use the stock retainers with comp 918's?

 

yes....

 

Thanks!

 

someone said that they talked to comp and comp said the there is slack with the stock retainers and 918's. Im swapping tomorrow. I just bought 918's and new 918's retainers. For $40 I think its worth it to be safe

 

I used stock retainers for 7+K miles on 918's with no issues.

 

i called comp about using the stock retainers with the 918s when doing the cam swap just to make sure there were no potential issues. comp indicated the stock retainer fitment wasn't as good as the comp retainers and suggested i use their retainer. i looked at as cheap insurance. when doing a side-by-side fitment comparision, the stock retainers had a lot of slop IMO, whereas the comps fit fairly precise with little lateral movement.

 

Did you do that comparison with the retainer locked and installed?
I was unable to budge the retainer installed and much less compressed.
the only way I would change those is if I spun over 6300 rpm and I would swap them for titaniums.
Stockers work just fine. (Nothing scary there).

 

I went TI just because they were thrown into the deal. help me out with valve float maybe for a few rpms.

 

If you don't mind me asking, where did you get ti retainers for $40.

 

no. i did the compare with the springs sitting on the bench. i placed both the stock and comp retainer on a spring and visually compared the amount of play each retainer had. the stock retainer had a smaller ID locating diameter allowing it to move around on the spring more than the comp retainer. IMO that small amount of play could allow the spring to move around at certain harmonics or in the event of some valve float, which could be possible trouble. i did it for the peace of mind, besides the comp steel retainers are only like $60, and are machined pieces, fit good without play, and are a lot stronger than the factory pieces.

 

my bad. they were $50 at tr

 

$50? at Thunder? that is about $70 cheaper than anywhere else...that can't be right.

 

Comp Cams makes 2 styles of retainer for the 918 spring. Steel and Titanium. He got the steel set.
Per Thunder Racing's web site the Titanium Retainers for 918 springs are $272.99.