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grailoc Samba Member
Joined: March 25, 2004 Posts: 1441 Location: FRANCE and now QUEBEC city
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TinCanFab Samba Member
Joined: April 04, 2006 Posts: 2743 Location: Waterford, California
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grailoc Samba Member
Joined: March 25, 2004 Posts: 1441 Location: FRANCE and now QUEBEC city
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Kjell Roar Samba Member
Joined: December 08, 2008 Posts: 1326 Location: Norway
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Posted: Mon Jan 23, 2017 9:53 pm Post subject: Re: Domed piston into stock 36hp engine |
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It depend of how doomed the pistons are, but VW used doomed pistons in T3 1500 and T1 1200 73-up some years.
You want higher compression, so no modifications needed unless you want higher compressions. I know that you can flycut the heads more than 3 mm without problems, with the flat pistons. _________________ I got a historic car, every scratch got a history...
My car, Aug. 4th, 1955 / an early 56: http://www.thesamba.com/vw/forum/album_page.php?pic_id=610438 |
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grailoc Samba Member
Joined: March 25, 2004 Posts: 1441 Location: FRANCE and now QUEBEC city
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Mr. Motorhead Mad Scientist
Joined: January 06, 2004 Posts: 717 Location: Practitioner of 36hp alchemy
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Posted: Fri Jan 27, 2017 2:06 pm Post subject: Re: Domed piston into stock 36hp engine |
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And our survey says *bing!* No it will not cause any real problems. If you have the USA spec engine (most likely) of 6.6:1 stock compression the dome tops will bring you to around 7:1 or there about depending on the shape of the dome. Large, open chambers on the heads allow this. Make sure to check before assembling that your dome does not interfere (hit) with the head. If it does just simply clearance with a die grinder (.040" minimum). _________________ 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 |
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grailoc Samba Member
Joined: March 25, 2004 Posts: 1441 Location: FRANCE and now QUEBEC city
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Mr. Motorhead Mad Scientist
Joined: January 06, 2004 Posts: 717 Location: Practitioner of 36hp alchemy
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Posted: Fri Jan 27, 2017 7:00 pm Post subject: Re: Domed piston into stock 36hp engine |
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grailoc wrote: |
thank you Matt,
this is the answer I was looking for.
Here is a picture of my head, do you think it will clear the space?
my car is a US spec bought new in Germany with the US program back in 56.
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As you are looking at that head picture, the two places that -may- need some trimming are the two sides on ether side of the spark plug hole. That wholly depends on the style domes you have, there are three I know of. Most clear just fine but it never hurts to make sure for your own piece of mind. I always do a .040" minimum clearance. _________________ 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 |
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grailoc Samba Member
Joined: March 25, 2004 Posts: 1441 Location: FRANCE and now QUEBEC city
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Kjell Roar Samba Member
Joined: December 08, 2008 Posts: 1326 Location: Norway
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Posted: Sat Jan 28, 2017 11:41 am Post subject: Re: Domed piston into stock 36hp engine |
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VW added doomed pistons on 1200 40hp in the seventies, so I will be very surprised if you got problems with the 36hp, with lower compression than the 40 hp.
But check the deck height, if it is 40 hp pistons you got, they are 1mm higher from the piston pin. _________________ I got a historic car, every scratch got a history...
My car, Aug. 4th, 1955 / an early 56: http://www.thesamba.com/vw/forum/album_page.php?pic_id=610438 |
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grailoc Samba Member
Joined: March 25, 2004 Posts: 1441 Location: FRANCE and now QUEBEC city
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gregson1 Samba Member
Joined: December 13, 2004 Posts: 464
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Posted: Sun Jan 29, 2017 11:48 am Post subject: Re: Domed piston into stock 36hp engine |
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Are you doing the build? If you want to remove all doubt, measure it. You can do this by 'mocking up' the build. Get some solder or modeling clay and lay out some THIN strips of it across the top of the pistons, then slowly roll it though the cycles. Don't get crazy with the amount of clay. Take it apart and check that the impressions in the clay or thickness of the solder. If it's less than 040" you could have some clearancing to do. I've also done this to verify the clearance of the case and piston skirts. |
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grailoc Samba Member
Joined: March 25, 2004 Posts: 1441 Location: FRANCE and now QUEBEC city
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grailoc Samba Member
Joined: March 25, 2004 Posts: 1441 Location: FRANCE and now QUEBEC city
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sgmalt46 Samba Member
Joined: April 20, 2005 Posts: 1296 Location: south san francisco
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Posted: Wed Feb 08, 2017 10:48 am Post subject: Re: Domed piston into stock 36hp engine |
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now this is a high compression piston ! made by jahns back in the day. 8.5 to one. maybe use them on my next build ? _________________ 55 deluxe 23 window bus
64 crew cab
55 rag top beetle
66 beetle
71 square back (sold) ! good luck with it Henry!
46 beetle 552nd royal army service corps CCG |
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grailoc Samba Member
Joined: March 25, 2004 Posts: 1441 Location: FRANCE and now QUEBEC city
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Snort Samba Member
Joined: April 02, 2005 Posts: 1957 Location: Seattle, WA
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Posted: Thu Feb 09, 2017 10:59 am Post subject: Re: Domed piston into stock 36hp engine |
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grailoc wrote: |
I will post closer pic of mine when I receive them. |
When you post your photo, I would be interested to know how tall the crown of the dome is compared to the top of the piston edge. |
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grailoc Samba Member
Joined: March 25, 2004 Posts: 1441 Location: FRANCE and now QUEBEC city
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grailoc Samba Member
Joined: March 25, 2004 Posts: 1441 Location: FRANCE and now QUEBEC city
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