335 Hydraulic Tensioner's. Does the engine really require them

The hydraulic tensioner keeps the idler wheel in contact with the belt at all times, It keeps both sides of the belt tight. If you rotate an engine backwards you can watch how it works... Very important part.

 

Pretty much what Andy said.

I won't get technical, but they are a lot better than the old school fixed tensioners because when the belt slowly but surely stretches over time *they don't stretch much*, the hydraulic tensioner keeps moving outwards keeping good tension on the timing belt.

Fixed tensioners don't keep moving outwards to keep good tension on the timing belt.

They still work, but the hydraulic ones work better.

Probably why Ferrari and every other car manufacturer in the world has been using hydraulic tensioners since the mid 90's till today.

 

Another fix for a non existent problem. I suspect it was adopted in anticipation of the 10,000 RPM target redline that never came to fruition and the belt life issues related to that.

The prior designs never suffered for their absence. The V12 in production at the same time never suffered for their absence. A very large number of other engine designs including race motors that survive much higher RPM ranges never suffered for their absence.

 

none on the GT2 355 engine
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Nice fix.

 

The GT2 engine does how many years between belt changes?

Oh, about 1 race or 1,500 miles give or take.

 

On a standard road car, i would simply stick with the tried and proven design,albeit fitting new tensioners and hill idlers. Set the belt to factory spec and enjoy. Simple.

 

If someone came to my shop and asked me to fit some cobbled together belt tensioners to their engine, they would be shown the door. This would be a great modification for the diy weekend warrior who has the money to repair the engine when it ends up in a screaming heap.

 

And a nice fix for what????? Do these fail all the time?? Ive seen these faulty and still the belt has been in tact and ok???

 

And faulty after 16 years. The procedure is to simply replace them. Any shop doing otherwise is looking for a court case.

 

Who advocated not using them?


Some people really need to learn the language.