Raceproved Preoiler

[dvs_dave]

Classic Chim said:

dvs_dave said:

Lack of lubrication to the top end isn’t the issue. TVR themselves supposedly ran a test rig with the valve gear submerged in oil to test the lack of lubrication theory and it made no difference.

Incorrect/mismatched material hardness of the cams and finger followers is the problem, along with soft valve stem seals. This and a few other tweaks/upgrades are what the rebuilds fix.

I’ve always wanted to know this and thanks for making it clear and simple.
What other tweaks/ upgrades are we talking about here as I’m often asked about the engine so it would be good to pass on good advice regarding rebuilt units.

Oil pump is upgraded as well as the halftime bearings with an oil feed. Factory setup has no oil feed so the bearings fail and lunch the engine.

Better crank and rod bearings, cap bolts and upgraded rings are added whilst in there as why wouldn’t you. 4.3 and 4.5 builds have replacement billet cranks, new rods and pistons, hence why they’re so much more expensive.

And lastly, the engine is reassembled properly and with proper tolerances and care. Not slapped together and patted on the bum like they were in the factory.

Edited by dvs_dave on Saturday 4th May 18:57