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04-08-2023, 01:53 PM | #1 |
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Merc. crank in 59 engine
If putting a Merc. crank in a 59 flathead will the crank pulley from the stock 59 engine fit the Merc. crank? Will the 59 front pulley fit any 8BA engine?
Last edited by Sid; 04-08-2023 at 04:20 PM. |
04-08-2023, 02:55 PM | #2 |
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Re: Merc. crank in 59 engine
Use the 59A pulley. The Mercury pulley will put the belt too far forward. Also use the 59A timing gears.
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04-08-2023, 04:21 PM | #3 |
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Re: Merc. crank in 59 engine
The Merc crank is the same as the early crank dimensionally, except for the 4" stroke You can use the early rods as well as the late ones. You must use a piston with the wrist p
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04-08-2023, 05:11 PM | #4 |
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Re: Merc. crank in 59 engine
Yes the 59A pulley will Fit but you will have to use the matching early water pumps and distributor.
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04-08-2023, 05:33 PM | #5 |
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Re: Merc. crank in 59 engine
Thank you. After setting over the winter for about 7 months and after putting the stock 46 distributor in and started after warm up I noticed moisture in the oil. Not a belly full of water but still a little moisture present. I'm thinking if I need to look for another good 59ab I am going to put a Merc. crank in the 40. I just don't want to have to re design the front pulley fan set up to do so.
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04-08-2023, 08:41 PM | #6 |
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Re: Merc. crank in 59 engine
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04-08-2023, 09:13 PM | #7 |
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Re: Merc. crank in 59 engine
you always use the flywheel thats made for the block. Crank flange is the same, its starter location that dictates that. Not sure what pumps to use, others will fill the gap there
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04-08-2023, 09:14 PM | #8 | |
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Re: Merc. crank in 59 engine
Quote:
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04-08-2023, 09:36 PM | #9 |
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Re: Merc. crank in 59 engine
What type of moisture did you see? It's not uncommon to see moisture in a crankcase or inside an engine after sitting over the winter, especially if it's an unheated garage. You'd be surprised at how much can accumulate when the dew points are in cahoots against you.
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04-08-2023, 09:58 PM | #10 | |
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Re: Merc. crank in 59 engine
Quote:
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04-09-2023, 01:23 PM | #11 |
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Re: Merc. crank in 59 engine
I've done 4 early engines with a 4 inch crank. 2 of them I was lucky to score new still in cosmoline 59L blocks. I used an 8BA cam in all four so I could use the late style top mount distributor. Water pumps were mute as on all 4 I used my 409 water pump kit with my machined aluminum front timing cover and converted Chevy distributors.
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04-09-2023, 02:43 PM | #12 |
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Re: Merc. crank in 59 engine
If you're trying to put the later block in a 40 chassis - and want the easiest possible way to do it, then make the WHOLE front of the engine the same as a 39-48 24 stud engine.
You'll use the 59AB water pumps, timing cover, crank/cam gears, T-Slot camshaft, crank pulley, front-mount distributor, etc.. On the rear of the engine, you'll need to use the 49-53 flywheel and obviously the engine-to-trans bellhousing adapter and associated starter plate. The other thing that you'll need is the correct rear-sump oil-pan - which I believe is a bit hard to find and only on certain Mercury models and possibly trucks. The gang here can tell you what to look for??? This allows you to use the 40 Fan and Generator setup as well . . . |
04-09-2023, 07:56 PM | #13 |
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Re: Merc. crank in 59 engine
Is there any advantage to a relieved 59 AB block?
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04-09-2023, 09:16 PM | #14 |
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Re: Merc. crank in 59 engine
The age-old question and debate!
For a street engine that is NOT really ran at higher RPMs (like over 4500), it is probably of no use - and actually lowers compression. Compression is your friend . . . so losing it at lower RPMs and never really building a race engine (that needs the higher RPM breathing of a complete port/relief/valve/cam package) is a losing proposition. Now, if you're building a big cubic inch, heavily ported, big-valves, big cam, high RPM race style engine, it can help flow across the transfer area - but only at higher RPMs. |
04-09-2023, 09:35 PM | #15 |
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Re: Merc. crank in 59 engine
Kinda what I thought. It looks like it could drop at least 1/2 point in compression maybe slightly even more.
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