JSTAN

iTrader: (1)

Which is the better spring? Comp 921's or PP Dual Golds

leaftye

Why leave out the PRC double?

tomaSS

iTrader: (1)

I have the Patriot's and like them. There was a thread a while ago about this same topic. Try a search.

jrp

iTrader: (16)

what are the spec's of the 921's, i dont believe ive seen them yet myself. the PP golds and PRC spec's are in the cam guide in my sig.

jrp

iTrader: (16)

found it

Recommended Camshaft Style Roller hydraulic
Number Of Springs Per Valve Dual
Outside Diameter Of Outer Spring (in) 1.300
Installed Height (in) 1.770
Seat Pressure At Installed Height (lbs) 135
Open Height (in) 1.220
Open Pressure (lbs) 400
Inside Diameter Of Outer Spring (in) .870
Inside Diameter Of Inner Spring (in) .655

mrr23

iTrader: (3)

what about the vinci /crane duals http://www.vincihighperformance.com/superwebdeals.HTML

cyphur

iTrader: (10)

mrr23, i've not seen a lot of people run those springs? but why pay 330 for springs less battle proven over springs that everyone knows will be good to go, for 280? just curious what warrants the $50 difference!

hc_performance

iTrader: (4)

mmrr23, you must really really like vinci high performance!!

Beast96Z

iTrader: (21)

There have been a few posts about the cranes not being able to stack up against some of the cams out there. The Patriot/PRC springs havn't been fadded yet to my knowledge. The cranes have also had a few failures which can be undesirable. For the question at hand, I'd go with the Patriot/PRC's. There basically the same spring and come from the same company. The specs just had to be squed a bit on the PRC's to make them "diffrent" from the Patriots.

mrr23

iTrader: (3)

well seeing as my wife's car is one of their test cars, i guess so.

cyphur - i have the Crane/ vinci springs in the wife's car currently. i'm sure there are plenty others running the springs. they just call them Crane. Crane and vinci work together in developing LSx products. the $50 difference? steel material they use would be one reason. do the ones for $280 include titanium retainers and spring seat locators?

mrr23

iTrader: (3)

the cranes you say that have had failures, is this the new current design ones with the blue(i think) stripe? or the first design? even PP had a problem with their first design. to my recollection, i think all the cam manufacturers have had issues with their first design springs.

the current duals on the wife's car are the first design. they've been on since april 04. granted on a stock cam, but no issues with them.

Beast96Z

iTrader: (21)

I wouldn't say that they were bad springs, but when you can get the Patriot/PRC springs for ~$50 cheaper and they can handle more, why not???

mrr23

iTrader: (3)

well they handle the same. .650 lift. but i'm with you, if they are good and less expensive, get those.

Beast96Z

iTrader: (21)

Comp 918's are supposed to hold .625" lift to, but there is no way I'd run that on my car......

mike c.

iTrader: (1)

i run the 921's. g5x2 cam lots of 7,000rpm shifts and 10sec passes. they work great.

AZ Power & Sound

iTrader: (2)

Ive tried one set of the cranes on an X3 car and they floated bad at high RPMs... Ive used over 20 sets of Comp 921s all with flawless performance... I have over 20,000 miles on mine in the current car with the G5X4 and still pulling HARD at 7000 with no hint of valve float

Beast96Z

iTrader: (21)

The comps are good if you have the extra $. It all falls back to the dough. Why spend more if you don't have too? After some searching, the cranes seem to have pretty low open and closed seat pressures. This makes them weaker when it comes to bigger cams. Although I believe the post I'm fixing to link to was pointless as the original topic goes, it did bring forth a bit of good information.: https://ls1tech.com/forums/showthrea...pring+pressure

2000PewterZ28

PRC duals is the way to go.