77mm cylinders

vwsteve · Posted: Mon Dec 19, 2011 5:37 pm Post subject:

They changed them to get more fins and more fin surface area for better cooling.

dakdak · Posted: Mon Dec 19, 2011 5:11 pm Post subject:

8287111 · Posted: Mon Dec 19, 2011 1:22 pm Post subject:

Yes,and the "replasement style"is original from 66 up.

zabo · Posted: Mon Dec 19, 2011 11:37 am Post subject:

just pulled up this old thread from glutamodo

maybe this is where my confusion lies

Image may have been reduced in size. Click image to view fullscreen.

_________________
1960 6 volt sedan- 1978 adventurewagen
–wanted bill spreen atlanta dealer tag frame

8287111 · Posted: Mon Dec 19, 2011 10:02 am Post subject:

Early(up to-65)and late(66 and later)style 1200 sylinders,and off the later style there is two versions,earliel whit same dimensons as early and later whit larger outer dimension at lower end(same as 1300,1500,1600.
Sorry my bad english.

zabo · Posted: Mon Dec 19, 2011 7:57 am Post subject:

yep I was going to order new cylinder/piston set.

Just want to make sure i get the right one- Ill measure the stroke when i get home this evening.

If they did put on 1300 cylinders when it was rebuilt the case would have been machined correct?
_________________
1960 6 volt sedan- 1978 adventurewagen
–wanted bill spreen atlanta dealer tag frame

dakdak · Posted: Mon Dec 19, 2011 7:20 am Post subject:

As a quick check, measure the old cylinder against the new cylinder.
_________________
The great enemy of the truth is very often not the lie - deliberate, contrived and dishonest, but the myth - persistent, persuasive and unrealistic.

JFK

dakdak · Posted: Mon Dec 19, 2011 7:16 am Post subject:

No they're not interchangable. If you try to put 1200 cylinders on the 1300 engine, the pistons will be banging into the head and you will bugger the engine in no time. If you put 1300 cylinders on the 1200 engine, your compression will be down. In either scenario, your pushrod tubes, push rods, carb inlet manifold, exhaust, tinware and the like will not fit due to the difference in the stroke of the engine. There will be a difference of 10mm (just under 1/2") on the width of the engine.

The stroke is the up and down movement of the piston in the cylinder. This is determined by the crankshaft. To measure, rotate the crank till a piston is at its lowest point of travel. Measure the distance from the engine case to the top of the piston. Rotate the crank till that same piston is at its highest point of travel. Measure from the same point on the engine case to the top of the piston. The difference in measurement will be the stroke. Either 64mm (1200) or 69mm (1300).

If you have removed your cylinders off the conrods, then measure to the top of the conrod.

Hope this helps.
_________________
The great enemy of the truth is very often not the lie - deliberate, contrived and dishonest, but the myth - persistent, persuasive and unrealistic.

JFK

zabo · Posted: Mon Dec 19, 2011 6:54 am Post subject:

thanks- im a little confused- I just pulled apart my engine -

I know it was rebuilt a few years ago.

but it is a 1200 engine (code 5742676) and it had the 1300 cylinders on it.

are they interchangeable? How do you measure the stroke?
_________________
1960 6 volt sedan- 1978 adventurewagen
–wanted bill spreen atlanta dealer tag frame

dakdak · Posted: Mon Dec 19, 2011 6:17 am Post subject:

The top photo with the case bolts passing the outside of the cylinders are 1200 pistons/cylinders. They are slightly shorter than the lower photo which shows the case bolts passing through the cylinder fins. These are 1300 pistons/cylinders which has a 69mm stroke as opposed to the 64mm stroke of the 1200.

Hope this helps.
_________________
The great enemy of the truth is very often not the lie - deliberate, contrived and dishonest, but the myth - persistent, persuasive and unrealistic.

JFK

zabo · Posted: Mon Dec 19, 2011 4:30 am Post subject:

no one?

_________________
1960 6 volt sedan- 1978 adventurewagen
–wanted bill spreen atlanta dealer tag frame

zabo · Posted: Sun Dec 18, 2011 8:18 pm Post subject: 77mm cylinders

whats the difference between these two types of 77mm cylinders?

this style:

& this style

_________________
1960 6 volt sedan- 1978 adventurewagen
–wanted bill spreen atlanta dealer tag frame


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