Trash or treasure: Ancient TwinCam race engine
Posted: Mon Aug 27, 2018 5:23 pm
Hello all,
Much of the back story here is nonessential, so I'll just give the important details: I have in my possession a TwinCam engine that was used by my father for racing in the late 60s, 70s, and possibly the early 80s. I don't believe the engine has run since the car(s) it powered were retired from racing (one of them was my Elan, which now has just a standard road engine). Unfortunately my father passed in 2014, so I have very limited information about how this engine was modified over its time in service.
Anyways, enough of the boring sad stuff. Here are some pictures with my comments on what I've found so far. I'd also appreciate input on whether or not this engine is able to be restored. Warning: Pictures are large.
This is the engine, as I found it. It was sitting on a wooden dolley, which was lucky for me as there was no help in sight to assist in moving it!
I was somewhat pleasantly surprised when I pulled the cam cover. I expected worse.
Upon closer inspection however, the exhaust cam is pretty tired. This was the lobe for cylinder #2. The lobe for cyl 3 was pitted and had one small chip near the edge also. So, this camshaft is now suitable for use as a paperweight (or a trophy to put on my desk?)
This is the block exactly as I found it when I pulled the head. The bad news is that all four bores have rust in them. The good news it that this block has never been bored out. Pistons 1 and 2 are also in rough shape, as you can see. The cooling channels are very badly corroded indeed, and the surface of the block isn't in great shape.
I don't have any pictures of the bottom end, and I didn't get to pulling the pistons and crank yet, but my only comments there were that 1) the sump was converted to a dry sump system and 2) the bottom end was free of rust and nothing stuck out to me as a red flag, similarly the jackshaft was free of pitting or rust and showed very little wear.
I suspect that the dust in the cylinders (especially #2) was unfortunately corroded aluminum dust from the head, as that exhaust valve was left open when it was stored. The rust dust in cyl 1 was also due to a similar problem, but was due to rust in the exhaust headers going back into the head when I tipped the engine over on its other side. I don't have any pictures of the head, and I haven't assessed its condition yet but the entire valvetrain would need to be redone at minimum. I just started this a few days ago and had to go out of town yesterday, so apologies for making this post before I finished cataloging everything. I'll update within the next week or so as I make more progress.
Edited 10/11 to fix some statements I made previously that I now know were incorrect
Much of the back story here is nonessential, so I'll just give the important details: I have in my possession a TwinCam engine that was used by my father for racing in the late 60s, 70s, and possibly the early 80s. I don't believe the engine has run since the car(s) it powered were retired from racing (one of them was my Elan, which now has just a standard road engine). Unfortunately my father passed in 2014, so I have very limited information about how this engine was modified over its time in service.
Anyways, enough of the boring sad stuff. Here are some pictures with my comments on what I've found so far. I'd also appreciate input on whether or not this engine is able to be restored. Warning: Pictures are large.
This is the engine, as I found it. It was sitting on a wooden dolley, which was lucky for me as there was no help in sight to assist in moving it!
I was somewhat pleasantly surprised when I pulled the cam cover. I expected worse.
Upon closer inspection however, the exhaust cam is pretty tired. This was the lobe for cylinder #2. The lobe for cyl 3 was pitted and had one small chip near the edge also. So, this camshaft is now suitable for use as a paperweight (or a trophy to put on my desk?)
This is the block exactly as I found it when I pulled the head. The bad news is that all four bores have rust in them. The good news it that this block has never been bored out. Pistons 1 and 2 are also in rough shape, as you can see. The cooling channels are very badly corroded indeed, and the surface of the block isn't in great shape.
I don't have any pictures of the bottom end, and I didn't get to pulling the pistons and crank yet, but my only comments there were that 1) the sump was converted to a dry sump system and 2) the bottom end was free of rust and nothing stuck out to me as a red flag, similarly the jackshaft was free of pitting or rust and showed very little wear.
I suspect that the dust in the cylinders (especially #2) was unfortunately corroded aluminum dust from the head, as that exhaust valve was left open when it was stored. The rust dust in cyl 1 was also due to a similar problem, but was due to rust in the exhaust headers going back into the head when I tipped the engine over on its other side. I don't have any pictures of the head, and I haven't assessed its condition yet but the entire valvetrain would need to be redone at minimum. I just started this a few days ago and had to go out of town yesterday, so apologies for making this post before I finished cataloging everything. I'll update within the next week or so as I make more progress.
Edited 10/11 to fix some statements I made previously that I now know were incorrect