dirt track racer 81

iTrader: (39)

This is on a friends truck (DozerDan) its the new style 918..

jrpimp00

iTrader: (17)

What exactly happend to make it break?Anything other than normal driving?

elias_799

iTrader: (8)

wow that sucks. was the car cammed ? also you might have more then cylinder head damage there.

good luck, let us know how it goes.

dirt track racer 81

iTrader: (39)

Thats the sad part. He was just cruisin down the highway. When you have somethin like this happen, you want a good story to go with it like racin a vette or somethin.. cam was .600 lift.

Yes it has a .600 lift cam. im sure the motor is toast.

Nitroused383

iTrader: (10)

Were those springs actually recommended for the cam? What lobe profiles were being use, what cam was it exactly. How many miles on the setup? Need more info before you go blaming a spring. If his specs are anything close to your cam, I think those are far from ideal springs.

dirt track racer 81

iTrader: (39)

its a lunati 232 237 .600 .600 112 lsa cam. he bought it used, thats all the specs the guy told him and thats the springs the guy was using. i dont think they had 10k on the clock

99_Z28

iTrader: (3)

Those springs are rated for a max of 600 lift...looks like you cut it a little to close. I wouldnt run anything bigger than a 580 lift cam with those springs.

allngn_c5

iTrader: (3)

Probably should jumped the comp 921's for some added safety.

cam

iTrader: (9)

I have no idea why anyone uses those single beehive comp crap springs. I understand the science behind them and all the hooplah but the proof is in the pudding and I see all sorts of breakage complaints with these. I've never seen ONE single complaint of breakage on Patriot Golds yet and they cost less.... Why everyone doesn't run them boggles my mind

Raise

iTrader: (31)

agreed, but dont dog the behive design. i have yet to see a thread on a broken PAC spring. i went with PAC 1218s and PAC also has 1518s which are also a single behive spring. the difference is 1218=good to .600 lift and 1518= good to .650 lift. there are plenty of satisfied PAC users and like i said, i have yet to see a PAC spring break.

however, to the original poster, why cut it so close? Im running PAC 1218s cuz my cam only has .563 lift. if i was anywhere near .600 i would upgrade. not to mention...why the hell would you buy a spring that breaks all the time? there are so many instances of those 918s breaking. i dont know if its caused by bad install and mismatching or the spring itself, but all the horror stories alone were enough to stray me away from them

cam

iTrader: (9)

Well thats true enough. The factory uses beehives and I dont see many recalls about them so the design itself i suppose must work well and the tech behind the beehive design sure is interesting.

As for PAC? Yeah man a great rep... and the price to match it.

I'm a value guy so I spend where its nec but no more than nec and Patriot have my vote for the best bang for the buck in the spring dept right now.

massls1guy

iTrader: (9)

These are PAC 1218's, $122.95 from SDPC. Good price if you ask me:
http://www.sdparts.com/product/SDL16...S1Setof16.aspx

cam

iTrader: (9)

Hmm Cheaper than i recall. Anyways no seals or ti retainers included in that price. Add those items to the PACs and compare to the patriot package at $255 for all and forget it there no where close

DaveX

PAC and PSI are both good choices for that cam.

vettenuts

iTrader: (4)

Curious, did you measure installed height?

Before blaming the spring, measure the others. Most stock setups come in at around 1.760" (yet everyone assumes its 1.800"). The Comp 918 coil binds at 1.140". Since you had 0.600" lift, that means you were compressing the spring to within 0.020" of coil bind. That setup was living on borrowed time and I am really surprised it went this long if your installed height is as short as I think it may be.

You really need to measure so if that is what happened you don't repeat the error on the next setup.

Raise

iTrader: (31)

also remember, whenever you put dual springs on stock heads, it is usually a good idea to change spring seats...not to mention, new retainers and locks are a must. it is fortunate that the patriot gold kit includes these. anyway, you can swap single beehive springs with no other changes whatsoever. you can use the stock retainers and locks. you can drop some valvetrain weight by going to titanium retainers, but bang for the buck...a single beehive is a good spring when its matched up with the right cam.

STEEPSS

iTrader: (30)

that is EXACTLY why i went with duals.

1BADTALS1

iTrader: (4)

first time ive heard of the 918's having problems i got them with my cam .581 lift 112lsa and they been in for about 20k miles...no problems at all...

whitew01ws6

iTrader: (12)

thats why i just say go with dual springs no matter what. even if one does break u have a some security. rather be over kill than have a valve rape a cylinder wall

vettenuts

iTrader: (4)

Everyone is blaming the spring with no information on the installation. My money is on installation issues.