The V8 Owners Forum -

There are two things not to be mixed up: First we have the mathematical/geometrical ratio like explained above assumed the air is in the cylinder and combustion chamber and is than reduced to volume of only combustion chamber what is the chamber in the head, the gasket & the piston. Second is the pr...

If not familiar with tuning and tuning of the Rover I would aim for not catching too much problems by climbing mountain territory. The stock EFI 4.6 Rover can do a lot that the 4 litre will only do after a lot of tricks. The stock fuel injection just from the metal parts is not bad and can be upgrad...

The later heads are machined a little bit to compensate the bigger composite gasket. You can mill the original heads but the surface for the inlet manifold must be machined, too. Bigger rise in compression ratio must be achieved with other pistons with less dish. As the engine did some miles it woul...

Agree to that, although the Rover P6 cam is a bit smoother compared to the 285 Piper and from that can not handle higher CRs. The hotter the cam the higher the CR ratio can/must be! As suggested it is a good chance to bring the combustion chamber to the size of the 94mm bore what allows to avoid som...

DaveEFI wrote:I've never seen a compression that low due to piston/bores even on a very worn engine.

That is correct, that is why I wrote piston/bore related what also
includes broken rings that might scratch into the bore or the piston
or a damaged piston where some relevant parts fell off.

The question is what is really needed and what is felt to be done a bit lazy by the Rover company but does no harm. So the cam lobes have a slight angle to both rotate the lifters and cause a force to push the cam inside the housing. Normally they press against the housing and never move away toward...

Sorry I am German and will explain what I mean: The crank is the original Buick crank like it should be and fits into the crankcase. The problem was solved in the factory to make it fit. They did so by not fitting the whole required counterweight to the crank. So it fits but is not balanced properly...

What you will need is a systematically searching for leaking instead of working on the most likely failures. For that I would make a sparkplug that can be connected to compressed air. Connect and apply pressure about 5 bars and be aware that the piston will move to BDC with some power. Than you have...

I have no idea why any would worry about using a 40 yo engine that the P76 4.4 engine is. It wasn't a great engine when new and is worse now. A bottle ship can be built easily without the bottle :-) It is the challenge and it is the ROVER that especially attracts me to investigate in silly projects...

Could the crank modification be applied to the 4.6 blocks? They are already cross-bolted mains and able to support larger bores. If you look at my pictures you can see a 5.7 litre engine based on the 4.6 cross bolt with flanged liners. It has the maximum bore somewhat above 96mm and a 98mm stroke w...

My plan was to also use an aftermarket Buick 300 stroker flywheel on the 350. I didn't want to get into making complicated rebalancing or shaving the counterweights on the crank. Interesting report and how far you already have been. You can be happy that you did not finish. My crank was externally ...

The P76 is the better block for that purpose. Looks quite good but there remains the problem with the manifold. Did you rebalance the crank? It is externally balanced what leaves the problem that pulley and flywheel are imbalanced and are different to the Rover parts? Seems the problems moved elsewh...

Some pictures, they tell more than words! First is the front of the crank. Note how the oil hole moves due to grinding mains down from 3" to 2.5" https://dl.dropboxusercontent.com/s/htag58rl7mgsqqg/340%20crank%20front.jpg Same problem with the mains in the middle https://dl.dropboxusercontent.com/s/...

Yes, will do. What do you want to know? Anyway it will not become a race engine but a strong puller just from idle because stroke is very long and rod length is limited creating high acceleration and max speed on the piston. I had it in use with a 260 degree ISKY hydraulic cam. The piston was simila...

It is the 3.85 crank with 3" mains. Do not remember but I think it was the 340 and there are some differences, one fits the other one not. The main steps had been to cut the mains to 2.5" cut the rear end and drill the holes for flywheel took the extralight 5.85" Chevy rods and forged pistons from K...