Isky Valve Springs and Wear

Keep it on topic, it will make it easier to find what you need.
ScoopMan
Posts: 135
Joined: Thu Oct 07, 2010 2:12 pm
Your car is a: 1971 Sport Spider and 1979 Spider 2000
Location: Fairfield, CT

Isky Valve Springs and Wear

Postby ScoopMan » Thu Jun 01, 2017 5:50 pm

Hi there, just wondering if anyone had concerns or opinions about Isky valve springs leading to more wear on the cam lobes and tappets. Higher stiffness means more force, more force means more friction, which means more wear. GC springs much pricier, but worth it? I am rebuilding a 1608 with 9.8 CR pistons, possibly a hotter intake cam (TBD), some head work (TBD). I have a new Weber 32/36 DFEV and an 1800 intake manifold on hand, but somewhat tempted to go the dual carb route. Engine is out and I will dissassemble this weekend and bring the pieces to the machine shop shortly afterward.

Nothing too wild here. Not a track car, just want more fun blasting around country roads on sunny weekend days. I want it to last a while.... :)

User avatar
So Cal Mark
Posts: 13839
Joined: Wed Jan 25, 2006 3:45 pm
Your car is a: Fiat
Location: upland, ca.

Re: Isky Valve Springs and Wear

Postby So Cal Mark » Thu Jun 01, 2017 11:52 pm

the spring pressure still has to be set and the advantage to Isky or GC springs is to allow higher rpm, not just raise the seat pressure
Mark Allison
allisonsautomotive.com Fiat and Alfa Romeo parts and service. Performance parts our specialty!
Headers, ignitions, wheels, cams, flywheels
starsmark@hotmail.com 909-981-3566

fiatfactory
Posts: 506
Joined: Sun Jun 13, 2010 11:22 pm
Your car is a: 1970 128

Re: Isky Valve Springs and Wear

Postby fiatfactory » Fri Jun 02, 2017 8:08 am

.
Last edited by fiatfactory on Mon Jul 01, 2019 11:45 pm, edited 1 time in total.
nothing to see here... move along.

ScoopMan
Posts: 135
Joined: Thu Oct 07, 2010 2:12 pm
Your car is a: 1971 Sport Spider and 1979 Spider 2000
Location: Fairfield, CT

Re: Isky Valve Springs and Wear

Postby ScoopMan » Fri Jun 02, 2017 10:44 am

Thanks Mark and Steve. I have not driven this car properly since I have owned it, since I bought is as a mechanical basket case that could barely run, with only 100 psi compression. I also have a 1979 2000 that runs well, but living with that car for years I have learned there is nothing to be gained by taking revs much over 6000 with that engine. With the 1608, highly doubtful I would run it to 8000 much if at all, even though I understand it to be a much higher revving motor than the 1995. I will probably not run it much over 7000 to be honest, except winding it out on the on ramps.

As far as lightweight valve components, not really sure where to go with that, the options are basically OE steel or stainless valves, correct? I do not know the weights of the valves, but 'normal' steel and ss have nearly identical density. Do you think oversized valves are worth it with this little motor, assuming I get the throats opened up in the head accordingly? Maybe with a restrictive single carb it might not make lots of sense, but I would probably want the headroom for a dual carb set up if I chose to go that route at some point. All restrictions are cumulative, so it cannot hurt to reduce them when reasonable possible, I am thinking.

User avatar
engineerted
Posts: 531
Joined: Tue Feb 21, 2006 9:57 pm
Your car is a: 1974 124 spider
Location: Farmington Hills, MI

Re: Isky Valve Springs and Wear

Postby engineerted » Fri Jun 02, 2017 10:55 am

I have been running with Isky springs for the last 11 years, no issue for lobe wear. Oil type is going to be the bigger factor, choose an oil with higher level of ZDDP, (not trying to start another oil debate here) i use Rotella 15w40
Ted
1978 124 Spider, Complete Restoration
1974 Fiat 124 F Production Race car

User avatar
Odoyle
Posts: 440
Joined: Mon Dec 01, 2014 10:06 pm
Your car is a: 1983 Pinafarina Spider
Location: CA

Re: Isky Valve Springs and Wear

Postby Odoyle » Mon Jul 13, 2020 1:16 am

Thinking about getting a set, can anyone else share their experiences? Good and Bad please.


Return to “Engine and Tuning”

Who is online

Users browsing this forum: No registered users and 4 guests