need a new valve spring manufacture...

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03-07-2004 | 11:20 AM

#31

performancemary

Pressurized

Joined: Feb 2003

Posts: 360

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Sounds like some smart folks out there. Can anyone give me some advice. I have a pair of HP500's that were just pulled to do the springs. The leak down test netted over 20% on alll cylinders, one had 30% another was at 40%. Given the motors are out should I be doing the whole refresh or wait another 200 hrs. Hate to spend the cash if I don't need to . They ran fine last summer, they top out at 5050 rpm with 30" props and don't use any oil between changes. They have 270 hrs now.

03-07-2004 | 11:29 AM

#32

traviss

Thread Starter

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Joined: Oct 2000

Posts: 3,372

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From: On the river

if ya got em out.. might as well slap on some 14- 71's blowers

03-07-2004 | 11:29 AM

#33

RedDog382

Registered

Joined: Sep 2003

Posts: 3,029

Likes: 1

From: Toledo, Ohio/Las Vegas, NV

Sterling Performance uses Isky. Enough said?

03-07-2004 | 11:41 AM

#34

mcollinstn

Platinum Member

Joined: Sep 2001

Posts: 5,769

Likes: 150

From: tn

pmary

the leakdown should have indicated WHERE the leaks were (intake, exhaust, or rings). If your leaks are in the heads, then you MUST do the heads while the motors are out. If it is the rings (which would be odd) then your motors have been run hard into detonation or stored improperly...

03-07-2004 | 05:45 PM

#35

Ric232

Guest

Posts: n/a

Does anyone know the correct replacement springs (in ISKY and COMP) for a Gen VI 454 Mag MPI? I would have a stock cam but I will be upgrading to 1.8 roller rockers.

For what it's worth, the shop manual shows:

Inner and outer spring assembled
Free length = 2.15 in
Installed ht = 1.88 in
Pressure at 1.88in = 110 lbs
Pressure at 1.34 in = 316 lbs

Stock lift is .483/.483 w/ 1.7 rockers; .512/.512 w/ 1.8 rockers.

Thanks

Last edited by Ric232; 03-07-2004 at 06:33 PM.

03-08-2004 | 12:15 PM

#36

rmbuilder

MarineKinetics

Joined: Oct 2002

Posts: 942

Likes: 5

From: Rochester, NY

Traviss,
If you are going to replace the retainers, go as light as you can. Any weight you can remove from the valve side of the fulcrum is a plus especially at the lift and RPMs you plan on running.
Ric,
Ill check.
Bob

Last edited by rmbuilder; 03-08-2004 at 12:19 PM.

03-13-2004 | 11:15 PM

#37

Fountainclimber

Gold Member

Joined: Feb 2003

Posts: 428

Likes: 0

From: Sunny Florida

Can anyone recommend which Titanium retainers to use with the ISKY 8205-SP springs and which locks (at the standard height)? Isky's are $180 which is a little steep but if I have to, I have to...

Thanks

F

09-24-2009 | 02:24 AM

#38

FrankRizzo

Registered User

Joined: May 2007

Posts: 77

Likes: 0

Quote:

Originally Posted by Nordicflame

I just installed a set of the Isky 8205-PLUS.
These are the "Endurance plus series, extreme high endurance"
They are not the standard 8205 as these have tool room outers. Said to be the best they sell in this size.
At 1.906 they are 144 lbs and 434 lbs at .635 lift.
These are said to be the perfect numbers for the Crane 741 cam with crane hyd roller lifters.
I do know where you can get a great price on these if interested.
Dave

Hey Dave, it's been 5+ years since this post on springs; how did they work out? Any problems I can avoid? Thanks for your insight

09-24-2009 | 07:08 AM

#39

Nordicflame

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Joined: Mar 2002

Posts: 1,546

Likes: 4

From: Layton, Utah

We replaced those about 1.5 years ago and after 300+ hours thay had only lost 10 lbs.
I'm now running the 9005PLUS springs on my twin setup as I'm running 170 lbs. on the seat with the new high rpm Morel lifters and .670 lift.
RMBuilder can get you hooked up on all of your valve train stuff. Money well spent when considering the technical assistance he offers.
Dave