Home Built engine build. Saving the unsaveable.
10-13-2017, 11:50 PM
#31
We became involved in Jeff's engine project so we could have some fun. We love these older engines but do not get the opportunity often to work on them. It has turned out to be a lot more work than either Jeff or we ever thought.
Once the parts arrived and were inspected, it soon became apparent we had a huge task ahead of us. This project has allowed us to do work that we typically would not do as most would look for alternative parts. It shows what we can do, if required.
Most of the work has being bringing the parts back to life. The case head stud bores are back where they should be, the through holes in the cylinder heads are now in their proper position and size, the heads have new guides and seat inserts fitted along with the second spark plug hole. All the heads were from different sets, so none matched. They all needed matching for height, chamber volume as well as requiring all different sized OD seat inserts fitted. One guide boss was cracked so that had to be welded and then the boss reshaped in the port.
I would love to know the history this engine has seen. How it got into this shape and the person who actually did all of the damage.
We have designed new Pistons for this engine which have more current technology. Unfortunately, the forging I wanted to use cannot go down to this bore size, but it can be used in a 1.00mm larger bore size. But we have shortened the compression height, using a smaller pin diameter, narrowed the ring stack and narrower rings. The rods will be top guided to help keep the piston straighter in the bore. The rods have the pin bushing offset to match the shorter comp height. This add another 3.00mm to the rod length.
The crankshaft had the normal work done. Mag'ed, straightened, plugs out and flushed, journals polished, balanced etc. Nothing really more can be done. No knife edging as this is the worst modification you can do to these crankshafts.
The oil pump is getting new scavenge gears with should help scavenge the oil out of the case more efficiently and lower the aeration helping cooling the oil.
We have designed a new Camshaft for this engine quite different to the typical cams these engines have used in the past.
Jeff is converting over to EFI and we are working on a complete kit that will include all the sensors, wiring harnesses, ECU with a good base map included etc. Jonny from Classic retro is supplying his CDI units to use so we will have the best ignition available.
All of these parts will be available from us once we have Jeff's engine tested.
Once the parts arrived and were inspected, it soon became apparent we had a huge task ahead of us. This project has allowed us to do work that we typically would not do as most would look for alternative parts. It shows what we can do, if required.
Most of the work has being bringing the parts back to life. The case head stud bores are back where they should be, the through holes in the cylinder heads are now in their proper position and size, the heads have new guides and seat inserts fitted along with the second spark plug hole. All the heads were from different sets, so none matched. They all needed matching for height, chamber volume as well as requiring all different sized OD seat inserts fitted. One guide boss was cracked so that had to be welded and then the boss reshaped in the port.
I would love to know the history this engine has seen. How it got into this shape and the person who actually did all of the damage.
We have designed new Pistons for this engine which have more current technology. Unfortunately, the forging I wanted to use cannot go down to this bore size, but it can be used in a 1.00mm larger bore size. But we have shortened the compression height, using a smaller pin diameter, narrowed the ring stack and narrower rings. The rods will be top guided to help keep the piston straighter in the bore. The rods have the pin bushing offset to match the shorter comp height. This add another 3.00mm to the rod length.
The crankshaft had the normal work done. Mag'ed, straightened, plugs out and flushed, journals polished, balanced etc. Nothing really more can be done. No knife edging as this is the worst modification you can do to these crankshafts.
The oil pump is getting new scavenge gears with should help scavenge the oil out of the case more efficiently and lower the aeration helping cooling the oil.
We have designed a new Camshaft for this engine quite different to the typical cams these engines have used in the past.
Jeff is converting over to EFI and we are working on a complete kit that will include all the sensors, wiring harnesses, ECU with a good base map included etc. Jonny from Classic retro is supplying his CDI units to use so we will have the best ignition available.
All of these parts will be available from us once we have Jeff's engine tested.
10-14-2017, 12:23 AM
#32
That lump was truly butchered and many if not most builders would have just tossed it or said 'take it elsewhere'....lucky you wanted to assist...very.
Amazing job....do you think it'll run?
jk
Amazing job....do you think it'll run?
jk