why do cammed LS1s always tick?
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
You can quiet them some with the correct lifter preload. If you are running stock lifters, you want to be in the 0.080" - 0.100" range of preload with the stock rockers. You could just pull one rocker and make a measurement, but something like an XER lobe will be noisier.
I think Crane takes a little different approach, they go a little easier on the ramp rates of the cam and pop the valve faster using the rocker (assuming you are using the Crane rockers). It does make for a quieter setup though.
Race Director
Joined: Dec 2004
Posts: 13,760
Likes: 75
From: Haymarket VA
My 346 w/ a 230-236 XE-R 112 cam sounded like a sewing machine. I'm running a MUCH larger cam in my 402 but use Cadillac Racing lifters and Trend .110 pushrods and it's not much noisier than stock.
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Team Owner
Joined: May 2003
Posts: 23,480
Likes: 9
From: East Meadow NY
St. Jude Donor '12
Team Owner
Joined: Mar 2001
Posts: 25,889
Likes: 7
From: Virginia Beach
CI 3-5-6-7-8 Veteran
I have an '01 Z06, my father has an '04 Z06, and my mother a '99 MN6 vert... they all have a sewing machine like noise to some extent. It's the nature of the beast.
I'll be installing a G5-X2 cam in mine w/ comp 921's and I fully expect more valvetrain noise... it's not a problem to me.
I'll be installing a G5-X2 cam in mine w/ comp 921's and I fully expect more valvetrain noise... it's not a problem to me.
Race Director
Joined: Oct 2002
Posts: 16,477
Likes: 26
From: Gone
CI 6-7-8-9-10 Veteran
St. Jude Donor '03
G5X4 cam (24x/24x XE-R lobes on a 111 lsa), PRC dual springs, 7.425" pushrods.
Stock heads, lifters, rockers, etc. (for a limited time
).
Engine is very quiet, no ticking. Inside the car with radio off, if you focus really hard, you can detect a faint "sewing machine" sound...but it certainly isn't obvious or noticible.
I was actually surprised at how quiet it was when I first drove it after the cam swap.
Of course I can never be content, so the car is in the process of being torn down again to flycut the pistons, and put on some stage 2 TEA 5.3 heads, GMPP "caddy" lifters, ARP studs, .040" Cometics, and probably some adjustable roller rockers.
Stock heads, lifters, rockers, etc. (for a limited time
).Engine is very quiet, no ticking. Inside the car with radio off, if you focus really hard, you can detect a faint "sewing machine" sound...but it certainly isn't obvious or noticible.
I was actually surprised at how quiet it was when I first drove it after the cam swap.
Of course I can never be content, so the car is in the process of being torn down again to flycut the pistons, and put on some stage 2 TEA 5.3 heads, GMPP "caddy" lifters, ARP studs, .040" Cometics, and probably some adjustable roller rockers.
Drifting
Joined: Oct 2004
Posts: 1,345
Likes: 3
From: Mesa Arizona
I'd like to know more about these Cady racing lifters.
