Calas Cam VS. Riva anyone?

[jetplane]

That's a myth. In fact, Riva actually saw a torque increase on their dyno with their Spring/Retainer kit.

What about the retainers with oem springs ?

[05_RXP]

Exactly! We floated valves at 8650 on stock springs and just retainers.

So how does one know when he's ÔÇ£floating valvesÔÇØ

[TAB686]

The valves have a meeting with the pistons and then they let you know the hard way!

[tiderider]

So how does one know when he’s “floating valves”

Things that make you go BOOM!

[guybb3]

I did just Riva retainers with the stock springs and valves on my old 2008 TX. It wasn't long before the need for speed returned......

What will be your targeted max rpm?

I really don't know. I hit the rev limiter the way it is set up (8500 rpm tune and 90 degree intake) now and all I plan on doing is the IMUK since I have to retune to raise the rev limiter anyway. Springs and retainers and 8800?

[1tommygunner1927]

I really don't know. I hit the rev limiter the way it is set up (8500 rpm tune and 90 degree intake) now and all I plan on doing is the IMUK since I have to retune to raise the rev limiter anyway. Springs and retainers and 8800?

8800 rpm with springs and retainers is totally doable and is reliable.

[guybb3]

8800 rpm with springs and retainers is totally doable and is reliable.

Thank you, Tommy. So if I'm going with springs and retainers would you guys bother to pull the head to do it or do it in place? If I pull the head I would go with head studs. Whole nother project, although not a big one.

[05_RXP]

The valves have a meeting with the pistons and then they let you know the hard way!

I guess that's the worst case. However you know you can float valves With out doing any damage and there are ways to see this. However most of the time it's referred to as dropping a valve when contact is made.

[1tommygunner1927]

Thank you, Tommy. So if I'm going with springs and retainers would you guys bother to pull the head to do it or do it in place? If I pull the head I would go with head studs. Whole nother project, although not a big one.

Do a compression & leakdown test. If results are good no need to pull the head to change springs/retainers. Buy or borrow the proper tools to do the job yourself or have your favorite shop do the work.

[TAB686]

You are correct. A lot of high rpm performance can be held back when doing upgrades other places and not doing at least retainers.

I guess that's the worst case. However you know you can float valves With out doing any damage and there are ways to see this. However most of the time it's referred to as dropping a valve when contact is made.

[GB RIVA]

Riva says they will have new rocker arms this spring that will handle the better springs and more rpms

[GB RIVA]

I have a 2018 rxpx 300 25 original hours(all riva) with xx wheel, cam, Thur hull vt100 injectors, water box fresh air intake
maptuner 3 plus with cam 8900 rpms stock springs with retainers
ran great first time out 84-85 lots of fun

took back out now will not run over 80 with 8450 rpms

new pump, 58-60 fuel pressure super slips at 16-17 lbs, no leaked in intercooler
battery good, new 93 fuel just put in tank all three cylinder's same compression about 115 cold

the only think we can come up with is the motor 5 years old and the stock springs are bad

anyone else gone thru this
?????

[Water4fire]

Intake manifold upgrade kit to support manifold, to aid it, so it wont burst. May have intake manifold leaking boost.

[ou812]

If you talk with calas he will tell you over 9000 rpm it's not a question of if you will break a rocker but when you will.

My buddies ski broke an arm @ 8800 with a CRT cam with springs & retainers that CRT supplied. Ruined the head and CRT cam.

[ou812]

We just bought the Calas cam so we'll see the results against the CRT cam with same CRT ECU'd stage 3 setup. Can't speak for the riva though.