74 vs 80 Cylinders
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looking at the dome one could surmise the compression is different - BUT keep it around 8.5 to 1 - the reason is the Fuel is garbage today
if you have an 80 inch lower unit the compression height is different than that of the 74 inch motor pistons -- and in the interest of common parts SO you can fix it with out braking the bank keep the stuff with the parts in common - IE all 74 stuff if its a 74 all 80 stuff if its an 80 inch its cheaper trust me
if you have an 80 inch lower unit the compression height is different than that of the 74 inch motor pistons -- and in the interest of common parts SO you can fix it with out braking the bank keep the stuff with the parts in common - IE all 74 stuff if its a 74 all 80 stuff if its an 80 inch its cheaper trust me
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1941 was the change year for the big twin and earlier motors are restored to the later if the entire engine is re done as it is easyer to get replacements going foward
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Both cyls the same length, piston wrist pin location on the 3 31/32" stroke 74", is lower than the 4 1/4" 80" piston.
Scott
Scott
__________________
HILLSIDE MOTORCYCLE & MACHINE, INC.
HARLEY-DAVIDSON SPEED & SERVICE CENTER
5225 SOUTH MAIN ST., MUNNSVILLE, N.Y. 13409
Sales/Support 315-495-6650
www.hillsidecycle.com
Walk-in Retail Showroom
Complete H-D Machine Shop
Case & cylinder boring
Complete Cylinder Head Shop
High-Performance Engine Kits
Crank Rebuilding
Direct Link & PowerVision Tuning
Goodson HD Tooling Manufacturer
Maxton Mile World Record
4500 sq ft. facility
OVER 35 YEARS OF H-D ENGINE BUILDING.
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HILLSIDE MOTORCYCLE & MACHINE, INC.
HARLEY-DAVIDSON SPEED & SERVICE CENTER
5225 SOUTH MAIN ST., MUNNSVILLE, N.Y. 13409
Sales/Support 315-495-6650
www.hillsidecycle.com
Walk-in Retail Showroom
Complete H-D Machine Shop
Case & cylinder boring
Complete Cylinder Head Shop
High-Performance Engine Kits
Crank Rebuilding
Direct Link & PowerVision Tuning
Goodson HD Tooling Manufacturer
Maxton Mile World Record
4500 sq ft. facility
OVER 35 YEARS OF H-D ENGINE BUILDING.
See us on Facebook.
Last edited by Hillsidecycle.com; 10-29-2014 at 06:58 PM.
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