Any experience with Oversized 36hp Pistons

EriksOval

I am getting ready to build a 36hp for my oval and was wondering if anybody had any experience honing out the cylinder and using .5mm Mahle oversized pistons.

oval56 · Posted: Wed Mar 21, 2007 1:38 am Post subject:

normaly you have to use bigger pistons, or do i have lost some information that i can use oversize pistonsrings on stock pistons??( only rework cylinders???)
_________________
www.oval56.com

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

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

virtanen · Posted: Wed Mar 21, 2007 2:12 am Post subject:

A work shop can bore your worn STD cylinders to match the oversize pistons. This work just requires special tooling to hold cylinder during machining.

oval56 · Posted: Wed Mar 21, 2007 4:04 am Post subject:

virtanen · Posted: Wed Mar 21, 2007 5:19 am Post subject:

Of course

Wolfgang1 · Posted: Wed Mar 21, 2007 6:25 am Post subject:

and oversized piston rings....off course.

I was lucky to find a set of 77.95 (second oversize) pistons and a set of NOS 2.oversize piston rings.

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

I gave the used cylinders to a machine shop to bore them to 78mm.
In combination with the okrasa stroker crank the cylinder capacity increases to almost 1330ccm.

Wolfgang

EriksOval · Posted: Wed Mar 21, 2007 6:40 am Post subject:

Thanks,
Yes the pistons are oversized, I got a couple of sets probably 8 years ago from Wolfsburg West. I will see if RIMCO can hone out some used cylinders I have collected and fit those pistons.

Mr. Okrasa

Im in the process of making 83mm "big bore" piston and cylinder kits for the 25hp/36hp engines. I have had alot of requests for these and nobody seems to want to take on the task of manufacturing them. There is a need for them since the only way to get more cc's out of these "tiny" engines is to stroke them....

I WILL NOT release them to the general public until all my testing is done. These piston and cylinder kits MUST last just as long as the factory 77mm original types. They will maintain the same cylinderwall thinkness or even thicker as that of a stock 77mm liner with NO cylinder distortion! I will put out a "Press Release" when they are ready to be distributed. Wont be cheap but you get what you pay for.... Enjoy photo!

Cheers! Mr. Okrasa Wink

view my website at: www.imageevent.com/mrokrasa

vw56german · Samba Member Joined: October 20, 2005 Posts: 26

Ok, Mr Okrasa, dont tease. Show us the neat toy on the underside of that motor. Others may have, but I have not seen that item before. It looks sweet. Cool

25horseboxer · Samba Member Joined: July 02, 2006 Posts: 210

Those cylinders aren't going to stay black are they? Confused

oval-55 · Posted: Fri Sep 28, 2007 9:10 am Post subject:

gimmesomeshelter · Posted: Sat Mar 29, 2008 6:56 pm Post subject:

Hello-

Any progress?

Thanks,

Paul
_________________
"I would rather have questions that can't be answered than answers that can't be questioned."

Richard Feynman

Mr. Okrasa

I have checked with several manufactures of pistons and cylinders and the price seems to be around $1850 retail. Too much money!!! Still working to get a "better" price.

Will keep working on it...............

Stay tuned...

Mr. Okrasa


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