Domed 36 hp. pistons???

[mightymax1800c]

wanted to knwo if anyone on here knows anythign about the domed VW 36hp pistons?

[gatorwyatt]

in the mid 90's i found a oval with a 36hp with a hole in the top of the block.the owner had the draeger dip stick oil temp gauge hanging in his shop. iknew there was a stoker crank in the engine so i bought it with out knowing.i took it home and the pistons were ruined but were domed top and the crank was a okrasa crank. it had empi stamped on it and i sold it to someone.anyway...it did not have barrel spacers that i can remember but it was still single port .whoever owned it went the chep route.

[mightymax1800c]

ok so they do exist.

[morymob]

I have a set of 36-dome pistons & cyls,wanted to use in my 58ragtop.anyone know if a swap out replacement and compression ratio??

[oval56]

some use later pistons from the 1200 engine, and machine the dome on it becaus 36 hp have one mm less fire land than the later pistons, so you can machine the dome..

also vw offerd formula vee pistons with dome, also for later 1200cc engines with 77mm bore
_________________
www.oval56.com

1956 Oval, 2364ccm typ4
1957 Oval Ragtop 1584ccm singel port modified
1950 Hebmüller, 1584ccm okrasa modified

DBK Germany!!!!!!!!!!
www.dbkvw.com

[Mr. Motorhead]

I'm running a set of dometops in a 57 sedan I drive every day.With the head flycut .040 and the domes it makes 7.5/1 compression.Never gets hot even though I've pushed it hard at 60-70 for the last 3000 miles (I'm not running a splitcase transmision).Only setup issue is a small clearance problem with the dome on the heads,an easy fix.Runs good on any grade gas,32-38mpg depending on how hard you step on it.
_________________
30 years experience in the sales of new and used auto parts!
36 horsepower parts for sale at http://www.aircooledresearch.com/
Or the new site at http://www.bugparts.com
Check out the Bonneville project:
http://aircooledresearch.com/docs/thebonnevilleproject.html#

"All limitations are self imposed."
Some Chinese guy

[morymob]

I see a problm with 1200 pistons=pins are larger.

[oval56]

[Mr. Motorhead]

Let's talk a little bit about the small differences between 36hp (1200cc),40hp (1200cc),and 1300cc engines. 36hp and 40hp have a couple things in common.They share the same stroke of 64mm and a wrist pin size of 20mm,and same size piston of 77mm. The 40hp piston is 1mm taller than the 36hp piston.Don't get either confused with a 77mm piston from a 1300cc engine (22mm pin,different size ring grooves).A 1300cc engine is like a 1600 on the bottom end.69mm stroke and rods with a 22mm wrist pin.These came in US imports for just a couple years but was offered in the Euro std model as a dual port (please correct me if I'm wrong...).All US 1300 models had flat top pistons,but most Euro 1300s I've seen had dome tops.These (1300 dome tops) might make a good piston if you are useing a crank with Porsche rods since they have a 22mm pin size.
_________________
30 years experience in the sales of new and used auto parts!
36 horsepower parts for sale at http://www.aircooledresearch.com/
Or the new site at http://www.bugparts.com
Check out the Bonneville project:
http://aircooledresearch.com/docs/thebonnevilleproject.html#

"All limitations are self imposed."
Some Chinese guy

[morymob]

Some mentioned using mazda 323 77.5 pistons,what yr/engine did these come from also what is wr/pin size,rods,cys shims etc ???

[Unkl Ian]

Some of the Mazda pins are 36 hp size.

[petrol punk]

[Mr. Motorhead]

[petrol punk]