4 stroking a Merco 61…

4 stroking a Merco 61…

This topic has 31 replies, 5 voices, and was last updated 15 August 2019 at 06:56 by JasonB.

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14 August 2019 at 14:04 #424126
JasonB
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@jasonb
belt drive would be very simple at the bottom end as you just need to replace the gear I showed with a toothed pulley, don't even really have to cover it up if you use a sealed bearing or two. The backplate could then be made the same overall shape as the original which would look neater. Then just a pulley with twice the number of teeth on the camshaft(s) or rotary valve(s). Check your PMs.
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14 August 2019 at 20:38 #424218
Martin Field 1
Participant
@martinfield1
Hmm, good points, Jason.

I was wondering whether I could turn the new liner from brass and have it chrome plated like the proprietary engines. I have a piece of 1" diameter brass already which is the right size for the crankcase. OK, I would have to silver solder a flange on top, but that ain't a problem.

Does anyone have any experience of this method?

Martin
14 August 2019 at 20:42 #424219
JasonB
Moderator
@jasonb
Sorry, I've only ever turned my liners from Cast Iron or steel barstock and either lapped in the piston or used rings.

Edited By JasonB on 14/08/2019 20:47:08
14 August 2019 at 20:49 #424221
Martin Field 1
Participant
@martinfield1
Ah, as I thought, Jason. I've never turned cast iron, apart from a smallish flywheel for a stationary engine. But that went surprisingly well actually, so maybe doing a C.I. liner isn't so frightening.

Martin
14 August 2019 at 21:15 #424229
Former Member
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@formermember32069
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14 August 2019 at 21:17 #424231
Martin Field 1
Participant
@martinfield1
Hmmm, I guess you're right. I can't find a decent chrome plater at the best of times!

Is C.I. barstock easily available?

Martin
15 August 2019 at 06:56 #424264
JasonB
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@jasonb
Yes.
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