Ok, how much HP can a TRS drive handle
#2
i have heard they are good to right around 500HP. a bit more if you watch the throttles. a friend of mine had 750's on trs's in a 38 scarab and went through a bunch of drives every season. should be fine with the 496's
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Throttles- Cleveland Construction 377 Talon
08 OPA Class 1 National Champion
08 Class 1 Geico Triple Crown Champion
08 OPA High Points Champion
10 OPA Class 1 National Champion ( happy now Ed! )
#5
If the drives are put together with the machined shim in the lowers , they are good to about 600 hp. If there put together with the regular crush ring I would say 500hp . The weak link in the drives are the right hand drive . The lower gear in the right hand drive that is located aft of the vertical drive shaft is the most common problem .This gear is not as well supported as the left hand drive . The left hand drive gear is located fore of the vertical shaft and is much better supported. The key to these drives is to machine the shim for the lowers and a make sure that the preloads on the bearings are proper. You should be more than fine with the 496's. Tom
#8
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I would have to agree that the nose of the TRS gear-case provides better support for the prop-shaft gear than the carrier assmb. behind the pinion as used with the right hand drive, but I don't understand why the crushable ring won't work as well as a machined shim. The load pushing on the gear is directly against the carrier thrust ring and not the load ring. Can someone please explain? And yes; I highly recommend cryo-treating. Just be sure you have an EXPERIENCED professional do the assembly work. Shimming for bearing preload and gear lash is CRITICAL and the upper and lower must set up as a unit...not independently. I feel that most TRS drives that have been apart fail because they were not reassembled quite properly. I'm inputting about 600 H.P. to a RH drive with no problems, but I'm not a cowboy. --- Jer
#10
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jp, you hit it right on the head, I cannot see a benefit in the solid shim.
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www.mercruiserparts.com
www.go-fast.com
www.bammarine.com
www.cyborgtransmissions.com
It's not alive -www.BoatStuffExpress.com - temporarily retired