BC springs and retainers VS Ferrea springs and retainers.

[Red7m]

I already have a set of BC springs and retainers that I planed to do with my build, the reason I got them was because of the price. But recently I came across a good deal on a set of ferrea components and dont know if I should go the route.

I am starting to think the BC ones wont be up to the task of what I want. For now I will be spinning the motor to the stock rev limiter with fcon/vpc/gcc unit as the EM and a greddy 20g turbo and supporting mods. But I plan on taking the motor up to the 7.5-8krpm range after I get my bottom end built and go stand alone.

So my question is does any of the more experienced guys on here think that the BC components will take those revs or should I get the Ferrea?

BC specs:
Spring Pressure:
BC1320 Seat: 34mm @ 60 lbs / Open: 24 @ 153 lbs / Coil Bind: 22.4mm

Ferrea Specs:
Seat: 67 lbs @ 34 mm / Open: 177 lbs @ 24 mm / Coil Bind: 19 mm

 

[Poodles]

the comp cams springs would handle that speed...

IJ would recommend the Ferrea since they're dual valve springs incase one of the springs break it will save your motor...

 

[bowsercake]

Pretty sure stock springs at 35lbs. I've heard that the CompCam BBC are 55-60. They are definitely a lot stiffer than stock. Stock can be compressed easily by hand. The BBC springs will not compress much at all just using your fingers.

 

[NeatOman]

the comp cams springs would handle that speed...

IJ would recommend the Ferrea since they're dual valve springs incase one of the springs break it will save your motor...

I thought a 7m was non interferences?

 

[Doward]

Non-interference has nothing to do with dropping a valve down into the piston

 

[IJ.]

the comp cams springs would handle that speed...

IJ would recommend the Ferrea since they're dual valve springs incase one of the springs break it will save your motor...

 

[NeatOman]

Non-interference has nothing to do with dropping a valve down into the piston

I just thought that if the spring brakes it would just sag a bit... I really didn't put much thought into it. :sarcasm:

 

[cuel]

With no spring pressure, what's going to hold the retainers in place?

 

[quake]

are we saying the comp cam springs and crower springs art the same spring?

 

[supra_ed]

isnt the ferrea valvetrain cheaper than the crowers any way? so why not get the cheaper dual spring and stainless o.s. valve setup

 

[quake]

isnt the ferrea valvetrain cheaper than the crowers any way? so why not get the cheaper dual spring and stainless o.s. valve setup

no way more expensive

 

[supra_ed]

really...i could have sworn i bought my ferrea valvetrain cheaper than what crower has theirs posted for. my bad

 

[Adjuster]

If your going to the 8k range, then the dual design would be good insurance.

If your using the stock rpm range, then it's a waste of money in my opinion.

The Comp springs are plenty for the stock range. More than plenty actually. The stock springs are a single design. They held up fine for the stock rpm.

The Comp springs have higher pressures, and possibly better metalurgy, and they are brand new. (Something your going to be hard pressed to find most people using on the 7M)

Cost? it's not a contest.

Comp Cams springs are 70.00 or LESS complete.

That is the deal of the century for this motor. Any rebuild of the head should include a set of these springs, even if your going to run stock fuel, turbo etc. They are just the best replacement spring for the money out there.

 

[IJ.]

Greg: Stock are duals?

 

[Red7m]

If your going to the 8k range, then the dual design would be good insurance.

If your using the stock rpm range, then it's a waste of money in my opinion.

.

Well I already have the BC springs and retainers and I am only doing a half of a build right now. I am going full on the head and just a stock build on the bottom for now so I can get the car running this spring, then do build the bottom with a spare block that I have. I was just second guessing the BC, but for now I will just be running the stock rev limiter untill I build the bottom and go stand alone So I guess they will do.

 

[tte]

I thought a 7m was non interferences?

Its like this...With a non-interence motor, if in case you got the timing horribly wrong or the timing belt snaps and when the pistons move up to top dead center , the pistons will never hit the valves when they are fully opened.

But if a spring breaks, this drops the valves into the cylinder and would collide with the moving piston.


Cheers,
Roy

 

[NeatOman]

I know... I just didn't think before i posted. Thats why to take the springs out you have to hold the vale up then push the spring down to remove the retainers. JEEZ cant i have a brain fart and say something dumb! LOL Its good really that you guys pick stuff out like that.

P.S. I have changed springs before... its easy as butta.

 

[Adjuster]

No. Stock is a single spring.

The Comp Cams are single springs, but they are part of the "Dual spring" setup for a big block GM engine. (The inner spring on that setup.)

The BC's I've never seen before, but it sounds like they are a single spring.

The "upgrade" springs from Japan are all single setups that I've seen.

Only the Ferrea setup has dual springs that I know of. (And IJ, you are the only guy I know of that has broken a spring in a 7M, but I'm sure others have done it, and never posted about it.)

In my opinion, the valve train setup stock is stronger than the rods for engine speed, and only those of us with stronger rods, lighter cranks and ECU's that allow higher than stock engine speeds need to worry about breaking valve springs before other stuff goes away. (Heck, with my stroker setup, the stock rpm limit is plenty fast enough even with the Pauter rods )

Perhaps if you destroked a 7M to 2.8L, and planned on running it at 8500 to 9000rpm, then valve springs would become a very serious issue. Lighter valves would be important as well. (Ti intake for example, or getting ones with undercut stems to reduce the mass, lighter Ti retainers and one part buckets would all be ways to reduce mass if your going to max valve train speed.)

But, my opinion is if your running stock engine speeds, the Comp springs are the best bang for the buck using stock valves or 1mm oversize valves etc. (And the best bang for the buck for those is e-bay.)

 

[IJ.]

Greg: LOL correct (been a long time since I've played with a stock head)

Just went out and popped a valve out of a junk head to check (not that I didn't believe you )

 

[jdub]

The BC springs are in fact single as well...got a set right here