jester1614

iTrader: (13)

I am running a cam that has .572 lift with 1.5 rockers, I am currently going to run them with 1.5s untill i can get 1.6 rockers.

I have a set of 10308-1 crane cams valve springs that i want to run but the max lift for them is .600 and with 1.6 rockers I will be running .610 lift, I know that I will be running these springs past their "MAX".

my rebuild is being done on a budget and the car account is almost empty (as always). Is it stupid of me to even think about running these springs .010 past their max?

cam is 242 242 572 572 112 solid roller cam and this car will not see high (6200+) rpm often at all

thanks in advance

joshh123

iTrader: (1)

i just reread that its a solid roller.. i highly doubt those springs are up for that task.

jester1614

iTrader: (13)

according to the crane install pdf these are the specs for this spring

For mechanical street roller equipped engines
- Recom’d installed spring pressure and height (valve closed)-------------145 lbs.@ 1.812”
- Open checking pressure and height ---------------------------------------------426 lbs.@ 1.110”
- Maximum recommended valve lift and RPM ----------------------------------.600” - 7500 RPM

jester1614

iTrader: (13)

back to the top

RamAir95TA

iTrader: (2)

Ideally you want at least .030" between when a coil binds and the max lift of the camshaft. On a setup like yours you'd be foolish to take a chance with going past their maximum capability. I would look for a spring that supports .640" or better.

And explain to me this, what is the point of going solid roller if you aren't going to use the RPMs that cam needs?

jester1614

iTrader: (13)

Yeah I didnt think It was a good idea, but figured I would throw it out there.

I went solid roller cause i got the cam and entire valvetrain setup (pushrods lifters guideplates roller rockers springs) for free from a friend. the cam will see high rpm occasionally.

This car will see the track occasionally as i can afford it, but mostly a street cruiser/weekend car. At the track it will see high rpms but mostly it will be used mildly.

RamAir95TA

iTrader: (2)

It only takes one high RPM dig to cause problems. It's not worth it, even "occasionally."

Getting things from friends for free is nice and all, but if it doesn't suit what you needs why bother? I would have sold it all, gotten a far more mild hydraulic roller and THEN you could have (likely) used the 99893s.

JMHO...

boosted LT1

iTrader: (3)

Yes it is.

Save the $$$ leave the current springs and 1.5 rockers. That will help your budget, save the springs and I bet you won't notice the lose even at that track.

jester1614

iTrader: (13)

I plan on using the 1.5s for quite a while, probably a year at least. I will get new springs when i get new rockers.

so what do you guys think of these springs per this application, keeping the 1.5 ratio rockers that make the lift .572 .572, spring limit is .600

joshh123

iTrader: (1)

patriot golds or extremes would be better but i still don 't think its the right spring for a solid roller unless its go some really lazy lobes. what does the cam card suggest?

jester1614

iTrader: (13)

cam card doesnt have spring suggestions on it

this is whats printed on the cam card

duration at .050 242 int 242 exh
lobe lift 381 int 381 exh
Lobe seperation 112


seat duration
at gross valve
lift 278 int 278 exh

valve lash hot 020 020

degree intake center lobe to 108 ATDC

Seat timing intake btdc 14.9 abdc 51.2

seat timing exhaust bbdc 59 atdc 7.4

can anyone figure out what my intake center line is from this info

myltwon

iTrader: (1)

A low rpm single pattern solid roller cam sounds kinda lack luster