Transplant 80ci into 74ci Cases

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Derek43WLC
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Transplant 80ci into 74ci Cases

#1

Post by Derek43WLC » Mon Jan 13, 2020 7:09 pm

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I have an 80ci motor minus the cases...I also have an extra set of bare 1974 74ci cases.
Can I transplant all the 80ci stuff into the 74ci cases?
Anything to look out for? Any clearance issue, etc..

Thanks in advance,
D.



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Re: Transplant 80ci into 74ci Cases

#2

Post by RUBONE » Mon Jan 13, 2020 8:25 pm

It all fits, just make sure the crankpin nut clears the right side and left case bosses. I'm not even going to ask how you came up with those parts.... :roll:

Derek43WLC
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Re: Transplant 80ci into 74ci Cases

#3

Post by Derek43WLC » Mon Jan 13, 2020 8:47 pm

.
Thanks for the reply Robbie, all good :D

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Re: Transplant 80ci into 74ci Cases

#4

Post by Andygears » Mon Jan 13, 2020 9:40 pm

You don’t mention pistons but pistons for 4 1/4 stroke need to be used.

Andygears

Derek43WLC
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Re: Transplant 80ci into 74ci Cases

#5

Post by Derek43WLC » Mon Jan 13, 2020 9:59 pm

Andygears wrote:
Mon Jan 13, 2020 9:40 pm
You don’t mention pistons but pistons for 4 1/4 stroke need to be used.

Andygears
Thanks for the reply Andy,
I have the most of the motor parts (...complete crank assembly, rods, pistons, cylinders, complete heads)
Missing some pieces like the oil pump, tappet blocks, rollers, pushrods...

D.

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Re: Transplant 80ci into 74ci Cases

#6

Post by RooDog » Mon Jan 13, 2020 11:05 pm

I have an oil pump listed in the Classifieds section....
....RooDog....

Derek43WLC
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Re: Transplant 80ci into 74ci Cases

#7

Post by Derek43WLC » Tue Jan 14, 2020 10:07 pm

.

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Re: Transplant 80ci into 74ci Cases

#8

Post by RooDog » Fri Jan 17, 2020 5:39 pm

Sorry, for some reason I was thinking this was Flathead Stuff, but I do have some Oil Pump parts for Shovelheads if you are interested I can sort them out for a complete package....
You should be on the lookout for a pair of 1973 and newer drive gears. They spin the pump faster for better lubrication flow.
....RooDog....

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Re: Transplant 80ci into 74ci Cases

#9

Post by kitabel » Fri Jan 17, 2020 6:24 pm

Good idea.
How to visual the drive gears:
1936-72: 20% engine speed (1/5th); “5:1” ratio
Pump drive gear 5 teeth
Pinion gear 25 teeth

1973-*: 25% engine speed (1/4th); “4:1” ratio
Pump drive gear 6 teeth
Pinion gear 24 teeth

The 1968-* pump internal gears are all the same size; feeds are .4375" thick, returns are .625" thick (and larger than previous), only the speed changes.

More comments on my site here: http://victorylibrary.com/tech/OHV-pump.htm

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