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Old 14-10-2011   #1
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85s 1500 valve springs -heavier bmw valve spring as alternative

I have recently been working on a 85s head for my x1/9. I am chasing higher rated valve springs. I have seen " Isky performance springs" listed for x1/9's on a Fiat distributors web site. As far as I can tell Isky does not produce valve springs at standard specs for any 1500 Fiat, but they do produce a BMW double spring for a 2002 316i that is almost a perfict fit (99%) with a higher spring rating.(serial number 625/626). Can any one confirm is this the same product people are sell as fiat performance springs. If so I am sure many Fiat owners would be interested. Thankyou.
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Old 14-10-2011   #2
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Re: 85s 1500 valve springs -heavier bmw valve spring as alternative

I've no idea. Only real ay to tell would be to test, on a bench, each set.

But an 85 in an X1/9?

Can't see any advantage over the old alternative of putting a twin cam in.
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Old 14-10-2011   #3
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Re: 85s 1500 valve springs -heavier bmw valve spring as alternative

Yes I intend on comparing the spring rate on both the stock Fiat valve spring and alternative option to identify the compression load difference. I am doing it for improved valve performance at high revs.. Not sure what the Twin cam ref was in relation to?? Thankyou anyway.
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Old 15-10-2011   #4
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Re: 85s 1500 valve springs -heavier bmw valve spring as alternative

Ok I have just realised an error. The 625/626 isky valve spring are from BMW's 1600 and 2002 (as in vintage cars). Not 2002 316i as I prev stated.. Slight error there folks... The top retainer sits snug in the outer spring and there is the slights amount of side movement with the retainer for the inner spring. hights are fine. Go to iskycams.com for the 625/626 spring specs..
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Old 18-10-2011   #5
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Re: 85s 1500 valve springs -heavier bmw valve spring as alternative

The twin cam reference: for decades people have been putting various versions of the Fiat twin-cam engine in the X1/9. It fits, there are still plenty about, in 2 litre form it'll give somewhere between 130 and 190 bhp (depending on state of tune).
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Old 18-10-2011   #6
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Re: 85s 1500 valve springs -heavier bmw valve spring as alternative

Just an idea to try, You might wanna send John an Email/message asking about this, he's done crazy amounts of work/development on racing X1-9 fiats etc, if anyone will know it will be him, Just an idea . .

http://www.engine-machining.com






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