Dual Valve springs or?
11-22-2021, 10:58 PM
#1
Dual Valve springs or?
Cams from 590-600 lift
660 BTR Dual valve springs with tit retainers or
Pac Beehive 1218-19s
From my search of forums : One camp says the beehive might break so duals are insurance, other say the lack of bad harmonics/resonance and RPm capability make the beehive the choice for the smaller lift cams?
opinions?
Pac says the beehive... my tuner says dual springs.
660 BTR Dual valve springs with tit retainers or
Pac Beehive 1218-19s
From my search of forums : One camp says the beehive might break so duals are insurance, other say the lack of bad harmonics/resonance and RPm capability make the beehive the choice for the smaller lift cams?
opinions?
Pac says the beehive... my tuner says dual springs.
11-23-2021, 01:29 AM
#2
Le Mans Master
I've had a dual spring break and nothing happened other than me swearing to never buy another Tx Speed valve spring. I had a Comp Cams (918) single beehive spring break and it cost me an engine. Just changed a set of BTR .660 dual springs with titanium retainers and after 30K miles with a .620 lift cam, they still tested good. Think I'll stick with the BTR dual springs. I'd listen to your tooner.
11-23-2021, 11:58 AM
#3
I've had a dual spring break and nothing happened other than me swearing to never buy another Tx Speed valve spring. I had a Comp Cams (918) single beehive spring break and it cost me an engine. Just changed a set of BTR .660 dual springs with titanium retainers and after 30K miles with a .620 lift cam, they still tested good. Think I'll stick with the BTR dual springs. I'd listen to your tooner.
11-23-2021, 07:40 PM
#4
Le Mans Master
When the Comp cams 918 spring broke, the cam was a mild blower cam. Something like a 222/230 116LSA with .580ish lift. I believe the cam was made by Comp also. Comp 918 spring failures were VERY common back when this happened. Comp gave me a new set of springs but didn't offer to pay for any of the engine damage.
When the Texas Speed dual spring broke the cam was a Cam Motion I had custom made. 218/230 118lsa with lift a little over .600. Tx Speed installed the springs on a set of their PRC heads. Texas Speed offered to give me 1 (one) spring and SELL me the other 15 at a reduced cost. They really stepped up, didn't they? I've been using the BTR platinums since then. I also told Tx Speed that I wouldn't hesitate to tell the story the way it happened. And I don't.
When the Texas Speed dual spring broke the cam was a Cam Motion I had custom made. 218/230 118lsa with lift a little over .600. Tx Speed installed the springs on a set of their PRC heads. Texas Speed offered to give me 1 (one) spring and SELL me the other 15 at a reduced cost. They really stepped up, didn't they? I've been using the BTR platinums since then. I also told Tx Speed that I wouldn't hesitate to tell the story the way it happened. And I don't.
11-25-2021, 10:18 AM
#5
Melting Slicks
When I put a TSP 228R 600 lift cam in my C5 I used dual 660 springs and wished I had went with the pac 1218-19’s. Yes dual springs are good insurance but I feel like it was too much spring for that cam. In addition to giving up some horsepower they were super loud. I hate an excessively noisy valvetrain and those def made plenty of noise. If you plan on the car seeing a lot of high rpm’s then yea prob go with the dual springs but if you are like me and just did some occasional spirited driving then go with the 1218-19’s
11-25-2021, 03:11 PM
#6
Race Director
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2021 C6 of the Year Finalist - Modified
My cam is a 220°/234° ..585"/.585" .118° LSA .Cam Motion custom grind cam in my PD 'Heartbeat' supercharged LS3.
Since the lift is less than .600" I am using the PAC-1218 'beehive' springs ... These are a 'drop-in' replacement spring for the OEM stock beehive springs that only have a seat pressure of 90 PSI
The PAC-1218 springs have a seat pressure of 135 PSI and an open pressure of 318 PSI, these springs are pretty easy on the valvetrain parts ... I only spin the engine to 6,400 rpm.
Since the lift is less than .600" I am using the PAC-1218 'beehive' springs ... These are a 'drop-in' replacement spring for the OEM stock beehive springs that only have a seat pressure of 90 PSI
The PAC-1218 springs have a seat pressure of 135 PSI and an open pressure of 318 PSI, these springs are pretty easy on the valvetrain parts ... I only spin the engine to 6,400 rpm.