| Author |
Message |
bnam
Samba Member
Joined: July 02, 2006
Posts: 3461
Location: El Dorado Hills CA/ Bangalore, India
|
 Posted: Thu Jun 26, 2025 7:45 am Post subject: 1300 vs 1600 cranks |
 |
|
While the stroke was the same for 1600, 1500, and 1300cc engines, were the cranks exactly the same?
Shouldn’t the 1600 crank be weighted differently than a 1300 to account for the higher reciprocating masses of the pistons?[/b]
_________________
1971 1302LS Convertible (RHD) owned since '74
Click to view image
1965 Karmann Ghia Coupe - under restoration
1966 Fiat 1500 Cabrio (with 1600 Twin cam)
1952 Citroen TA 11BL
Last edited by bnam on Thu Jun 26, 2025 5:00 pm; edited 1 time in total |
|
| Back to top |
|
 |
VWporscheGT3
Samba Member
Joined: September 01, 2006
Posts: 2177
Location: Gardnerville, NV
|
| Posted: Thu Jun 26, 2025 8:06 am Post subject: Re: 1300 vs 1600 cranks |
|
|
it has always been my understanding that the crank, flywheel and clutch are balanced together. since the weight of the rods, pistons, rings, wrist pins etc are directly opposite of one another in the engine it is key to get those as closely matched in pairs as possible. 1&3 and 2&4 respectively so they cancel one another out. meaning as long as those are balanced to one another , it should have no appreciable influence on the balance of the crank.
if someone has a better explanation or can correct me be my guest.
_________________
If you have any questions about Forged ICON 4032 VW pistons just shoot me a line. |
|
| Back to top |
|
|
oprn
Samba Member
Joined: November 13, 2016
Posts: 14769
Location: Western Canada
|
| Posted: Thu Jun 26, 2025 12:56 pm Post subject: Re: 1300 vs 1600 cranks |
|
|
| bnam wrote: |
| While the stroke was the same for 1600, 1500, and 1300cc engines, where the cranks exactly the same? |
There are slight differences in the oil hole drillings. The newer ones have a sort of elongated slot on the surface of the journals. There may be other minor differences too.
| bnam wrote: |
| Shouldn’t the 1600 crank be weighted differently than a 1300 to account for the higher reciprocating masses of the pistons?[/b] |
The stock cranks did not have counterweights therefore there would be nothing to change when changing displacement. VW counted on the opposing pistons and rods to cancel each other's weight out. Which they do.. sort of...
_________________
Our cars get old, we get old but driving an old VW never gets old! |
|
| Back to top |
|
|
Bobs67vwagen
Samba Member
Joined: March 27, 2005
Posts: 343
Location: Eastern north carolina
|
| Posted: Sun Jun 29, 2025 7:37 am Post subject: Re: 1300 vs 1600 cranks |
|
|
| The 1300 crank was made to accept the 6 volt flywheel. So if my memory serves me correctly you could not bolt a 12 volt flywheel to it. |
|
| Back to top |
|
|
|
