Eibach Valve Springs

[faverymi]

Hi there.

Anybody has used this set up?

They have 2 kinds,

Porsche 911 Air Cooled (from eibach website)

20701.212 (Set of 12) Dual Spring 31.6 mm 17.6 mm 55 lbs @ 36.5 mm 183 lbs @ 25.5 mm 11 mm 20.5 mm

20444.212 (Set of 12) High Lift Spring 31.75 mm 17.3 mm 90 lbs @ 36 mm 277 lbs @ 23.3 mm 12.7 mm

considering it for my 2.7 heads with solex cams.

Thank you.

[neilca]

I would go with the heavier set (20444.212) I am running springs that have a seat pressure of 130# with Solex cams. About 300" open pressure. I have revved the engine to 8300 rpm without float. If you are running on the street the 90# seat will be fine.

[Henry Schmidt]

I just bought two sets and I will test them and get back to you.
On paper both sets looks pretty good.

[BURN-BROS]

Originally Posted by neilca

I would go with the heavier set (20444.212) I am running springs that have a seat pressure of 130# with Solex cams. About 300" open pressure. I have revved the engine to 8300 rpm without float. If you are running on the street the 90# seat will be fine.

Hi Neil, as a reference, with the spring # you have you can run a DC90 profile to approx 8700rpm with stock adj rockers/ Ti retainers. You can free up some Hp by setting your springs to a more moderate rate such as 80-90 lbs @ the seat.

[ALEX P]

Interested in this one as they seem very reasonably priced. I've seen the Eibach springs for sale on Ebay but where else sells them?

Eibach Valve Spring-Set of 12 Porsche 911 63-97 - eBay (item 400158097033 end time Jan-24-11 03:46:49 PST)

Originally Posted by Henry Schmidt

I just bought two sets and I will test them and get back to you.
On paper both sets looks pretty good.

Henry, please can you tell us what retainers are you testing them with and how long do you you expect to test them over?

[neilca]

Aaron,

What would you recommend with the DC70 cam and steel retainers?

Thanks,
neil

[BURN-BROS]

Hi Neil,

I ran 110 lbs at the seat with the DC90 which IIRC has the same exhaust profile as the DC70. This was with a Ti retainer. If you are running John"s springs and are shifting at 8200rpm 110-120 lbs is acceptable. John may be a bit more conservative and have you run 120-130 lbs. Always double check with your cam guy prior to setting spring height.

Some Empirical data for you; We had a missed shift and broke an exhaust rocker @ 9300-9400 rpm. No visual damage to the valve but it was replaced anyway. This was with the settings in the above post.

[faverymi]

Here they are. Don't really have a way to test them. I hope I can have them working in the spring.
Going in 2.7 heads(with the forged retainers) with webers and DC-30 cams.

If anybody knows something that I should be aware, please let me know. Believe me I'm a rookie. And for the price just looked right.

Thank you.

[cmcfaul]

Just completed a rebuild with the DC30 cams. Love them!

Chris
73 911 E

[964-RSR]

This springs can be used with original steel valve spring retainers and seats without modification ?

[996tt_Stevo]

Would these work ok in my 3.0 SC with DC60 Cams?

[carslutt]

i drive by the eibach factory just about every time i leave my house, i wonder if i can stop in and pick up some springs in person. my motor over haul is asking for some better valve springs.

[faverymi]

So........ I'm just a driveway warrior. Any attempts are at your own risk.. LOL

I felt after talking to some builders that this were a good deal. Eibach is known for making springs. I paid 179 bucks for the set and this are the stiffer ones that can work on turbo and high RPM applications. I think they are a ridiculous deal for the price.

From talking to Eibach they would work on any air-cooled 911. Just checked how much power you are adding. The only problem is that it could stretch your timing belt after soooo many years of use. How do you know that and when it's going to happen??? I don't know and at that point I'm sure I will be tinkering in a different car.

Ask the pros but until 1977 ( 2.7 heads) valve retainers are forged so they are better. After that the retainers are cast so they are a little weaker. Again ask the pros for the right answer. If it makes a difference in my spirited street driving
i can't really tell.

I hope this helps and doesn't confuse anybody.

[faverymi]

And they are made in the USA. God bless america!!!

[996tt_Stevo]

so how long have they been in motor for and is everything going just fine?

[faverymi]

Stevo.

I just drop them at the machine shop. I will tell you in the spring how they perform.

Talking to my machinist I should be able to go 7200 RPM no problem.

There is a previous post by Nelica (I think) that is using them in a race app.

[996tt_Stevo]

Thanks

[neilca]

I am not currently using these springs, but thinking about it.

[996tt_Stevo]

I think I will just pull the trigger on these, I was a bit skeptical as not a lot are using them, but I have just done some research online and I can't find any issues with them and they do MANY applications. Let's face it Eibach have been around for many years and are renowned for their Springs whether Industrial or Automobile... sure they will be up to the job.

[Flieger]

Originally Posted by faverymi

... From talking to Eibach they would work on any air-cooled 911. Just checked how much power you are adding. The only problem is that it could stretch your timing belt after soooo many years of use. How do you know that and when it's going to happen??? I don't know and at that point I'm sure I will be tinkering in a different car.

...

I hope this helps and doesn't confuse anybody.

I am interested to hear how a 911's timing belt can stretch since they have been used for *so* many years.