honing damper for slip fit

[rocketracer380]

sbc fluidamper can i convert to slip fit and safety wire the crank bolt

[Dragsinger]

a press fit is required for proper damper operation. The harmonics/vibrations are transferred and dissipated from the crankshaft to the damper through the press fit.

Several damper manufacturers list the suggested interference fit on their respective web sites

[af2]

a press fit is required for proper damper operation. The harmonics/vibrations are transferred and dissipated from the crankshaft to the damper through the press fit.

Several damper manufacturers list the suggested interference fit on their respective web sites

That................

[bobalattie]

Many newer production engines use slip fit dampers...

[makin chips]

Many newer production engines use slip fit dampers...

Are they fluidampr pieces? If not, it really has no bearing on the conversation. How does that, apply to fluidampr operation?

[Roundybout]

If the fit isn't tight on a harmonic balancer designed for an interference fit it will not absorb the vibrations and can lead to failure of the crank or damper keyway, retaining bolt not to mention possible internal damage from undamped harmonics.

It can also produce a lot of heat making removal difficult if microwelding occurs. I'd follow the manufacturer recommendations.

[modok]

You are more likely to get away with that if the crank bolt is substantial size, and LONG, countersink and threaded as deep or deeper in the crank than the damper hub.

Then when you tighten the bolt it expands the crank. so while it may not be a press fit when loose, it is when tightened.
Long bolts also rarely come loose, so you don't need any safety wire.

It's held in place by interference fit, or the bolt. or in some cases some of each. Not safety wire.

[F-BIRD'88]

If the (press) fit is just a hair too tight you can heat the whole damper up in a big pot of boiling water on a stove.
Bring the water to a boil , then turn the heat down just to maintain a boil. Give it say 10 minutes to fully expand the damper.. Using good oven mits to avoid burning your hands, quickly put the hot (212°F) ish damper on the crank. Tap on with a wood or soft blow mallet. It will go right on. If it does not the hole is way too small.
A local machine shop can hone the hole slightly to make the correct press fit. Do not eliminate the press fit.
I have had new sbc dampers where the hole was just a few thousands too tight. It either has the correct press fit spec or it don't. Your machine shop can correct it.
Someone smart will know the correct press fit spec.

[rocketracer380]

pontiacs and buicks i believe arent press fit

[ClassAct]

pontiacs and buicks i believe arent press fit

I believe they ARE press fit for a Fluidamper. If you don't have the instructions, by all means CALL Fluidamper and ask them.

That damper is designed for press fit regardless of the name on the valve cover. Until FD says otherwise, I'm sticking to it. Since its been since 2008 since I've done a Pontiac I won't say for sure but I'm pretty sure I had to hone the FD to fit with .0005-.001 press fit

[MadBill]

pontiacs and buicks i believe arent press fit

No, but the bolt torque spec. is 160 lb-ft.!

[Geoff2]

And the bolt diam is bigger than the SBC so the bolts do not snap off @ 160 ft/lbs......

[Dragsinger]

I think the bottom line is doing what is recommended for each respective engine. The SBC is designed for a press fit.

[mag2555]

True, some motors are not a press fit, there a jam fit so to speak.

[Circlotron]

Then when you tighten the bolt it expands the crank. so while it may not be a press fit when loose, it is when tightened.

Holden 253 and 308 motors are like this I think.