F355 Rimac Valve Spring Tester - Ferrari Life
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post #1 of 34 Old 03-16-2015, 07:28 AM Thread Starter
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Rimac Valve Spring Tester

Hey Guys,

I just bought a Rimac 0-125# Valve spring tester off ebay for a pretty good price. Seems these really hold value.

If anyone ever needs springs checked, send me a PM and I'll check yours for free.

-Dave
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post #2 of 34 Old 03-16-2015, 10:03 AM
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Dear Dave,

Can you do these?

Best regards,
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Past: 500 Mondial S2 0556(0446)/MD owned 58 years from June 1960 to August 2018
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post #3 of 34 Old 03-16-2015, 10:11 AM Thread Starter
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Originally Posted by Admiral Goodwrench View Post
Dear Dave,

Can you do these?

Best regards,
Hello Admirl,

I'm guessing those are torsion springs so, no, I cannot. The Rimac I bought is for compression springs.

I'm guessing you knew that
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post #4 of 34 Old 03-16-2015, 10:28 AM
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I think that was one of those rhetorical trick questions...

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post #5 of 34 Old 03-16-2015, 10:36 AM
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Quote:
Originally Posted by David @ FluentInFerrari View Post
I think that was one of those rhetorical trick questions...
Of course, shame on me...

Best regards,

Robert

Past: 500 Mondial S2 0556(0446)/MD owned 58 years from June 1960 to August 2018
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post #6 of 34 Old 03-16-2015, 10:49 AM
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See what happens when you get old, you have to check your spring pressure

Nice unit Dave but its for "automobiles"

LOL

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post #7 of 34 Old 03-16-2015, 10:53 AM
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Besides, they are nicely installed and I do not plan on removing them anytime soon.

Best regards,
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Past: 500 Mondial S2 0556(0446)/MD owned 58 years from June 1960 to August 2018

Last edited by Admiral Goodwrench; 03-16-2015 at 01:40 PM.
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post #8 of 34 Old 03-16-2015, 10:55 AM Thread Starter
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Originally Posted by Admiral Goodwrench View Post
Besides, they are nicely installed and I do not play on removing them anytime soon.

Best regards,

Just to have the opportunity to work on that car, I can come remove them for you
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post #9 of 34 Old 03-16-2015, 01:39 PM
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Dear David,

Thanks for the offer but the motor runs great since my last rebuild. I am about wrapped up fixing an intermittent recalcitrant 3rd gear issue and am down to making new gaskets as we speak. It is a five speed transaxle with no synchs but "dog clutch" engagement. Requires practice and finesse. Sorry for the hi-jack.

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Past: 500 Mondial S2 0556(0446)/MD owned 58 years from June 1960 to August 2018
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post #10 of 34 Old 03-26-2015, 02:08 PM Thread Starter
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Got the spring tester last. 15 minutes of clean up today and it's like new.

Looking forward to trying it.
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post #11 of 34 Old 03-26-2015, 02:12 PM Thread Starter
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post #12 of 34 Old 03-26-2015, 02:47 PM
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Dave, did you buy a couple of reference springs for it? Used Rimac's are known to be off by as much as 10-20% because they rarely get recalibrated.

'99 550, Rosso Corsa / Nero, S/N:114654, Assy: 31836, Engine: 52084

High mileage, low compression, and missing on a few cylinders.....just like my cars.

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post #13 of 34 Old 03-26-2015, 03:23 PM Thread Starter
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Quote:
Originally Posted by cribbj View Post
Dave, did you buy a couple of reference springs for it? Used Rimac's are known to be off by as much as 10-20% because they rarely get recalibrated.
John,

I have not (yet). I have new springs in my shop that I can use to check. If I don't have heavy ones, I can order some from my supplier. My buddy might have a load cell we can test with.

I thought these units where self calibrating or they held there calibration? Apparently not so that you for the tip.

EDIT: Hey John, thanks for the tip. I contacted a place that might have a calibrated spring and will send it to me. He will let me know in the morning. Don't know what I was thinking about using something I have as they are not calibrated

Last edited by dave rocks; 03-26-2015 at 03:57 PM.
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post #14 of 34 Old 03-26-2015, 04:19 PM
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Dave, there's an engine builder supplier that sells reference springs. I've forgotten the name, but they have all kinds of cool stuff, including the biggest doggone degree wheel you've ever seen, which is also digital encoder based and has a resolution down to tenths of degrees, for when you really want to hit the numbers dead nuts...

You ain't truly OCD until you have one of those puppies in your shop

'99 550, Rosso Corsa / Nero, S/N:114654, Assy: 31836, Engine: 52084

High mileage, low compression, and missing on a few cylinders.....just like my cars.

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post #15 of 34 Old 03-26-2015, 05:23 PM
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Sorry, I was confusing 2 different suppliers.

Here's the reference valve springs: Rimac Calibrating Springs

And the laser pointer 24" degree wheel from the same supplier: 24" Laser Camshaft Degree Wheel

But here's the dog's balls in degree wheels: Digicam digital engine degree wheel

'99 550, Rosso Corsa / Nero, S/N:114654, Assy: 31836, Engine: 52084

High mileage, low compression, and missing on a few cylinders.....just like my cars.

Maranello Skunkworks Team Member
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post #16 of 34 Old 03-26-2015, 06:24 PM Thread Starter
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Thanks for the links John.

I think I'll make a 60 inch wheel

I actually would like to make one so I can engrave finer divisions. However, given the amount of adjustment within the pulleys, it a bit of a moot point unless start making offset pins
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post #17 of 34 Old 03-27-2015, 06:36 AM
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I use this tool quite often. In my experience it's easier to be accurate if using a dial caliper with this tool rather than the scale.

Also it's best to test the spring with the retainer and (if there is one) spring seat in place.

(of course considering the thickness of those parts when calculating installed height and open height)
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post #18 of 34 Old 03-27-2015, 09:57 AM Thread Starter
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Quote:
Originally Posted by INTMD8 View Post
I use this tool quite often. In my experience it's easier to be accurate if using a dial caliper with this tool rather than the scale.

Also it's best to test the spring with the retainer and (if there is one) spring seat in place.

(of course considering the thickness of those parts when calculating installed height and open height)

Yes, I would use calipers. The seat idea is also good but I would expect these to have ground flats so I would think they would stay square. But, I get the point, it will simulate the condition inside the head better.

Thanks for the tip Jim
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post #19 of 34 Old 03-27-2015, 10:11 AM
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By the time you adjust for parallax error, air density, gravitational pull and the fourth law of thermodynamics, the end result is identical to just using a conventional degree wheel. For a moment, I thought my browser had been hijacked to another site. Oh no....!

And when you get into measuring Ferrari spring rates, keep in mind that the only specs that matter (and are actually correct) are loaded and near bind. The free length figures for most car given in the WSMs are incorrect and will lead you down a path of thinking that the ones you have are defective. In reality, you'll find that the "new ones" are identical t what you pulled out.

Yep, bought that pony and sent her back to the farm...

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post #20 of 34 Old 03-27-2015, 10:19 AM Thread Starter
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Quote:
Originally Posted by David @ FluentInFerrari View Post
By the time you adjust for parallax error, air density, gravitational pull and the fourth law of thermodynamics, the end result is identical to just using a conventional degree wheel. For a moment, I thought my browser had been hijacked to another site. Oh no....!

And when you get into measuring Ferrari spring rates, keep in mind that the only specs that matter (and are actually correct) are loaded and near bind. The free length figures for most car given in the WSMs are incorrect and will lead you down a path of thinking that the ones you have are defective. In reality, you'll find that the "new ones" are identical t what you pulled out.

Yep, bought that pony and sent her back to the farm...

LMAO!! Dave, I think you are telling me I just spent $300 on a boat anchor Well, it will look cool in the garage and give people the impression that I know what I'm doing
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