engine and drivetrain Race engine questions

[Guest Anonymous]

Are titanium valve spring retainers worth it? What about rocker locks?

[Guest Anonymous]

I think the rocker locks are mainly for high reving engines or engines that will be run at high RPM's for long periods of time.

I might be wrong but this is what I've hear.

Leif

[Guest Anonymous]

Lee, I run both. I'm not sure about the keepers but the lock are a big yes. You can buy them directly from Rutland

and save big time......

[Guest Anonymous]

at high rpm's the springs that position the rockers can start to slide

around causing the eccentric to move off the valve. i did mine for

insurance and less clutter in the head. it's not a race motor but autox

and driving schools.

mike

[Guest Anonymous]

Ti retainers are worthwhile for an engine that sees high rpm use.

Ti will let you run lighter springs & result in less cam/rocker wear, and have fewer broken rocker arms.

The heavier steel retainer requires more spring force to move the extra mass.

Too bad there's not a cheap alternative to the heavy valves the M10 requires. Going to a 7 mm stem & guides would be worth even more weight savings, but the costs are far greater

The current trend is to use the "beehive" valve springs, which feature reduced diameter at the top coils. This allows even less mass at the end that travels the most, thru the smaller top coils + the smaller diameter retainer required.

At the Detroit Auto Show last month, I saw a Japanese automaker's engine that had this technology in production already. Great idea, why did it take so long to rethink the traditional valve spring design?

Same old basic parts, just a better design that's affordable for many applications.

[Guest Anonymous]

(nt)

[Guest Anonymous]

(nt)

[Guest Anonymous]

(nt)

[Guest Anonymous]

Do you have a website URL? TIA.

[Guest Anonymous]

URL: http://www.ruland.com/products.html

(nt)

[Guest Anonymous]

They seem to offer metric and SAE sizes. The rocker shaft measures 15.5mm, my guess is that I should go with a 16mm and hope there is enough tolerance to be tight around the rocker shaft.

[Guest Anonymous]

It looks like he got 5/8" two-piece collars.

[Guest Anonymous]

I may be wrong, but I was thinking the shafts were 14.5 mm and the SP-9-A collar (0.5625") could get reamed to size (14.5 mm is near 0.570")

If the shafts are 15.5 mm, then I'd find the next smaller size collar bore & use a reamer to finish size.

[Guest Anonymous]

I'd like to get closer to the proper size if possible.

Wonder how feasible it is to resize the next smaller collar.

[Guest Anonymous]

It ranges from $3.80 to $9.00

I guess that the regular black plated steel will do at $3.80. Bob uses aluminum ones, but I am reluctant when it comes to torque a small bolt in aluminum...