701M BLOCK ENGINE NUMBER P30477 REBUILD

‘need to get some of whatever you used!’

Yeh, well good luck with that Will. When I set out on this rebuild, I remembered that I had a bottle of some sort of rust remover on the shelf. Looked it out and gave it a try. Brilliant stuff. Only problem, its about 40 years old, and will no doubt contain everything that is banned today!. Had another look on the shelf yesterday, and came across the large tub of rust remover that I actually bought myself about 10 years ago, but had completely forgotten about. Hopefully, when I come to use it, that has also got some nasties in it that todays meh stuff has not. Note from Government, ‘Be careful out there children, don’t hurt your fingers with this stuff’.

Re machining costs, there seems to be a huge differentiation in prices between shops now. I did shop around before alighting on the company that I have used before. I have used Gosnsays in the past, but discovered that they never carried out engine balancing themselves, they farmed it out, so they were never going to be reasonable for that job. Also, they are quite a distance from me, so I passed on them. Having said that, just like painting a car, it is worth travelling for the right people.

You will find though, that costs have risen ridiculously over the past 2 years, due to electricity prices and the ‘little man’ in russia. Chating to the owner of the engineers I used, he told me that shop costs now are crazy and electric prices for commercial users only ever go up, unlike residential prices that fluctuate.

Re acid dipping, my shop quoted £150 + VAT and said they take blocks to Birmingham to get that done. I passed on that, as I thought the price steep, and also believed that they would not get the block any cleaner than I achieved. The sludge in my block had turned to dust as it had been kept dry for 40 years, and just digging at it with various tools removed it all. A pressure washer would have come in handy there, but a good hose and nozzle sufficed,

Leslie

I was searching for detail on my engine and came across this article
lotus-cortina.com/library/block/blocks.htm

I’ve been lucky enough to have found two L blocks in run of the mill cortina’s here in Australia. Maybe your engines backstory is linked to it being a factory replacement?
Cheers
Vaughan

Already covered in previous posts Vaughan.

Just a thought Jon. If you are coming up this way to see your daughter, I could take your block / crank and bits to my shop, or you could take them there yourself. They are about 1/2 an hour from me. By the sound of it, you would save a packet.

Leslie

A little bit of progress. The jackshaft is in, as is the crank.

I don’t know how I found the time to go to work, way back when. Just far to many jobs to sort, and now not enough time to get into the workshop. Very pleased with the machined parts though. The crank is still running STD thust bearings both sides, with 3 thou clearance ! Pwaah. Hope I have put them in the right way round :laughing:

Leslie



Looks pretty lush to me!

Is that Graphene on the caps, Les?

No, its Graphogen Jon. Sounds similar, but an entirely different substance. I believe graphene is a rare earth material and is used in mobile phones…but could be wrong.

L

Graphene is 100% carbon, but only 1 atom thick. Lots of hype about what it could be used for, but I am not sure it is currently used for anything outside of a research lab.

Sorry Les, I meant Graphogen. Autocorrect got me! I have an assembly lubricant that I used on my motorcycle engine - I’ll be using it when I reassemble my Twink.

Andy, off topic but graphene does get used outside of a lab. There are several startups trying to make a go of it, eg Versarien who are near me (coincidence). They sell it as an additive for tyre compounds, amongst other things. However, despite holding over 130 patents, their share price is 3p. So I guess graphene isn’t ready to hit the big time yet.

A little bit more work done but rebuild shelved for this year now as I am busy with other things. I hope to get back to it in the spring. Everything has been oiled up to stop flash rust appearing over the winter. Block now covered up to stop any dust getting in there. Pleased with the progress, but would have liked to have gotten the bottom end finished. Hey ho.



Found another picture. Note the + 0.015" small cut out pistons. The only oversize pistons that Lotus supplied in period 50 years ago. Bought off ebay 10 years ago. Asked the fellow if he had any more. One more set came the reply. Collected both sets from Rownham Services on the M3 on my way down to Dorset. Everybodys happy. Don’t know if the chap is on here, can’t remember his name, could have been Mike. Said he was a friend of Mr G’s of Bracknell manor. I didn’t hold that against him :laughing:

Leslie


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