998cc Short Engine Build

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Monty-4
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Re: 998cc Short Engine Build

Postby Monty-4 » Mon Sep 13, 2021 1:11 pm

Everything is painted, final hurdle is assembly with some custom thrusts to make up the small difference in main bearing width between the 948 and 1098 cranks/blocks.

Might have gotten carried away with the masking tape.
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68' 4-door Saloon, another 'Monty'.

philthehill
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Re: 998cc Short Engine Build

Postby philthehill » Mon Sep 13, 2021 3:33 pm

Do not know about the masking tape - but truly carried away with the paint 8)


kevin s
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Re: 998cc Short Engine Build

Postby kevin s » Tue Sep 14, 2021 9:30 am

Looks very nice but you might want clean one of the lugs back to make sure you have a good earth.

geoberni
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Re: 998cc Short Engine Build

Postby geoberni » Tue Sep 14, 2021 10:56 am

kevin s wrote:
Tue Sep 14, 2021 9:30 am
Looks very nice but you might want clean one of the lugs back to make sure you have a good earth.
That's a definite requirement otherwise we'll be here in a few months with electrics questions.
Monty-4 wrote:
Mon Sep 13, 2021 1:11 pm
Might have gotten carried away with the masking tape.
Far from it, there needs to be a nice clean, bare metal contact on at least 1 of those mounting lugs, preferably both.
A circle of tape would not have gone amiss on that.
With good clean, metal to metal contact maintaining the earth path from generator, to bracket, to engine block, to gearbox, to bodywork.

Not just on classic cars, I've seen far too many people get carried away with making stuff 'pretty' when maintaining electrical continuity is actually essential. Sometimes for static dispersal on workplace equipment.
Personally I'd rather see bare aluminium on the Dynamo/Alternator end castings. I'm pretty sure the original Dynamo only had a painted centre section containing the windings, and that was probably black.
The end sections were bare casting.
Basil the 1955 series II

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Monty-4
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Re: 998cc Short Engine Build

Postby Monty-4 » Tue Sep 14, 2021 11:39 am

Can't please everyone!

I didn't realise the alternator earthed through the block, the starter is painted similarly but with the mating face bare. A trivial matter to remove a little paint from the inside of the lugs though. Thanks.
68' 4-door Saloon, another 'Monty'.

geoberni
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Re: 998cc Short Engine Build

Postby geoberni » Tue Sep 14, 2021 12:03 pm

Monty-4 wrote:
Tue Sep 14, 2021 11:39 am
Can't please everyone!

I didn't realise the alternator earthed through the block, the starter is painted similarly but with the mating face bare. A trivial matter to remove a little paint from the inside of the lugs though. Thanks.
That's what I mean, where did you think the electricity went?
So many people forget about it because they can't see it.
Just removing a 'little paint' won't do it, you require a good metal to metal contact at every point in the circuit, as I explained.
It would actually be possible for you to remove all the paint from inside the lug holes, bolt it in and it not work.
Because without the mating end surfaces connecting you could have an air gap all around the mounting bolts.
Don't decry the idea, and think it must touch, because I've seen it done and wasted time chasing the snag before finding it.
At least you realised the starter needed bare mounting surfaces.
I have seen it so often where people get carried away with painting stuff, like mounting brackets... :roll: :roll:

The other favourite thing is using PTFE tape around electrical temperature senders, thinking the water will provide the earth path and wondering why the temp readings are way off..... :roll:
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Monty-4
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Re: 998cc Short Engine Build

Postby Monty-4 » Tue Sep 14, 2021 12:12 pm

Haha, I do understand that the magic pixies need somewhere to go, I suppose I assumed it was one of the connectors.

Maybe I'll go the whole hog and make a little earthing strap for it.
68' 4-door Saloon, another 'Monty'.

Chipper
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Re: 998cc Short Engine Build

Postby Chipper » Tue Sep 14, 2021 12:38 pm

Great looking paint job on the alternator! How did you do it - spray it or brush? I look forward to seeing it all completely assembled...
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