Post by Debs on Mar 30, 2007 14:40:56 GMT
Well I finally decided to go totally radical with the engine!
I'm working with Roger Fabry at Sabre Heads.
www.sabre-heads.co.uk/1.html
We are going to an 84mm bore (standard is 80mm) which allows me to have the biggest possible valves. Obviously this means new liners which will be 'interference fit', as well as new forged pistons.
Additionally the design of the 1800 K Series is less than ideal because, being long stroke, it is 'undersquare', and therefore less 'revvy' than, say, the 1600. This problem is compounded by the long stroke crank and short con-rod : piston deck ratio which gives rise to excessive piston acceleration (hence the problems with piston lands breaking at high rpm).
To combat this I am dropping the stroke from 89.3 mm to about 88mm (which means a custom forged steel crank), and increasing the rod length (which means custom forged steel rods). An 84mm bore x 88mm stroke = 1951cc.
This will also require a spacer plate to be made up and bolted between the engine deck and the cylinder head which will allow us to alter the waterways to a more ideal system. Gasket wise it will use a multi-layer system with separate oil and water seals and a separate fire ring set up (possibly 'Wills Rings'). The flywheel will also be an extremely light one to aid engine 'pick up'.
The cylinder head will have some fairly extreme work done on it by Roger (who was one of the guys responsible for both the 'Motor Sport' cylinder head (often incorrectly called the 'VHPD head'), as well as the 1400cc K Series Land Speed Record engine. This will be coupled with (initially) the stock VVC inlet cam set up and a hairy exhaust cam, although eventually I'll go for a different inlet cam with more lift. Additionally I intend to go for separate throttle bodies and richer injectors, although I'll run the plenum set up in the early stages.
It will be interesting to see what the motor produces in its differing stages of development, but we should get (eventually) at least 250bhp, since that is what the standard stroke, 82.4mm bore (1901cc) engines produce.
Ultimately I'll also be running direct port nitrous injection, probably a progressive 100 shot. ;D
I'm working with Roger Fabry at Sabre Heads.
www.sabre-heads.co.uk/1.html
We are going to an 84mm bore (standard is 80mm) which allows me to have the biggest possible valves. Obviously this means new liners which will be 'interference fit', as well as new forged pistons.
Additionally the design of the 1800 K Series is less than ideal because, being long stroke, it is 'undersquare', and therefore less 'revvy' than, say, the 1600. This problem is compounded by the long stroke crank and short con-rod : piston deck ratio which gives rise to excessive piston acceleration (hence the problems with piston lands breaking at high rpm).
To combat this I am dropping the stroke from 89.3 mm to about 88mm (which means a custom forged steel crank), and increasing the rod length (which means custom forged steel rods). An 84mm bore x 88mm stroke = 1951cc.
This will also require a spacer plate to be made up and bolted between the engine deck and the cylinder head which will allow us to alter the waterways to a more ideal system. Gasket wise it will use a multi-layer system with separate oil and water seals and a separate fire ring set up (possibly 'Wills Rings'). The flywheel will also be an extremely light one to aid engine 'pick up'.
The cylinder head will have some fairly extreme work done on it by Roger (who was one of the guys responsible for both the 'Motor Sport' cylinder head (often incorrectly called the 'VHPD head'), as well as the 1400cc K Series Land Speed Record engine. This will be coupled with (initially) the stock VVC inlet cam set up and a hairy exhaust cam, although eventually I'll go for a different inlet cam with more lift. Additionally I intend to go for separate throttle bodies and richer injectors, although I'll run the plenum set up in the early stages.
It will be interesting to see what the motor produces in its differing stages of development, but we should get (eventually) at least 250bhp, since that is what the standard stroke, 82.4mm bore (1901cc) engines produce.
Ultimately I'll also be running direct port nitrous injection, probably a progressive 100 shot. ;D
). 
