Hi Everyone,

Im on the route of getting the Cosworth 272 Cams,
What is the best/good Springs and retainer to match with this,
there is two brand crossing my mind;
Brian Crower BC0100 and Manley 26125,
Or can i use a Uprated Springs and use my stock retainers?
Engine is from Evo5, thought please










.

 

You can't go wrong with Kiggly

 

Gsc beehive. P#5039.
Stock replacement,stock retainers 8500 rpm tolerance.

 

I would not use the 5039. Several stories of the stock aluminum retainers breaking with upgraded springs. The MX2 will be fine with the GSC 5040, GSC 5041, or Kiggly springs.

 

I wouldnt buy upgraded springs. stock will be fine to 9000rpm on those cams

most people are just uneducated when it comes to springs for cams. over springing your valvetrain is not a free lunch. it costs horsepower, friction, heat, increased wear, etc, etc.

two people in here commenting about 5039 springs. they arent even aware your car didnt come with beehive springs from the factory. so I would take their advice with a grain of salt.

15 years ago the main tuning tool for the 4g63 was a simple AFC. this device recorded RPM data. and it had peak hold feature. there were threads back then about how much RPM the stock springs could be revved to with after market cams. there were many reports of accidental downshift over revs to well over 10,500rpm.

one of my cars was built with stock evo 8 valvetrain. bc280 cams. regularly revved to 9300rpm in AEM logs. 34psi boost 600whp/571wtq

most people dont understand that long duration cams can have a lobe shape that is easier to follow than a stock cam.

you really need to know if ramp rates are sharper on the cam you are using. thats when extra spring pressure is needed.

 

oh damn ive been on these for 2 years and i just bought some for my brothers build. Scared me now sir.

 

Ok change of plan as my friend will give to me his spare set of Cosworth Springs 20000164 beehive without the retainers, question is can use the stock retainers from evo789 to match with this springs?





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his springs are also weaker than e8 springs so your advice of him sticking with stock is a bit off..

another issue is spring stiffness vs RPM.. not breaking a spring at high RPM is no indication that the spring is stiff enough..

 

early springs measure 62 seat
beehive are 52

15 years ago there were no evos here. so those rpm figures came from early springs and earlier heavier hardware to boot.

my advice comes not just from reading forums. its amassed from working on the 4g63 for the last 20 years. making dozens of cars fast.

 

Run the BC springs and Ti retainers in my car for the past ~70k on 2 different cams sets now. VC was off ~5k ago to upgrade to S2 Billet cams and springs and retainers were still mint, absolutely no reason to change them out per tuners advice, as I was ready to go to GSC's spring/retainer kit.

Had no issues with tuning and car revs to 8.5k regularly on these and the previous cam set without any sign of issue in logs or in car. Never had any valvetrain related issue with the car to date.

Pick one that is compatible with the lift/duration of that cam set. Generally you'll never go wrong getting parts from the same manufacturer as you plan to. Throw them in, tune away, and enjoy!!

 

Curious:
So early 4G63 stock springs had spring pressure of 62 pounds.
And Kiggly Beehive are 52 pounds of pressure?

And based on your experience, may I ask how you see Beehives (Kiggly) work with GSC S2 cams:
What rpm approximately are they safe to?
Are the beehives excessively stiff for GSC S2 cams, wasting some energy in friction?

Thank you

 

52lbs is the stock evo 8 pressure. dave buschur thought the evo 8 springs were junk as they were so much less pressure than earlier springs. but it was realized all the moving parts that spring control was made lighter. so they were indeed an improvement in design.

I think kiggly springs are 90lbs seat?? they are overkill for most setups.

 

ive been on stock springs and retainers with Cosworth 272s for about 80k miles now and no issues (car has 120k miles total). car still runs smooth and strong

 

i know this is old but can you tell me how much hp, how high you revved, and what size turbo you were on?