25hp Piston Manufacture

Martin Southwell · Posted: Thu Jun 30, 2011 10:25 am Post subject: 25hp Piston Manufacture

Tried buying 25hp, 75mm pistons or piston/barrel assemblies recently? Impossible it seems, unless somebody out there knows something I don't! Somebody suggested that early Golf/Polo pistons are the same. Is this true? Has anybody fitted any of these? Sounds too good to be true, but stranger things have happened.

I'm exploring avenues for manufacturing the pistons, providing there is a demand, initially 1st oversize, and have a few reliable leads i'm actively following up at present, from coutries with a long engineering history.

The aim is to make them generally available providing it's worth doing so, and potentially offer a service whereby liners/barrels can be machined to match. Price is obviously going to be the key issue here. What would people be prepared to pay for a set of pistons?

Does anybody have any original plans/prints of these early pistons, as they do seem to vary? Thanks for any help.

Martin

ps Bad Camberg was very good.

johnshenry · Posted: Thu Jun 30, 2011 10:57 am Post subject:

I think I have an NOS set of 25hp pistons Martin. They will probably be going into an engine build in the next 10-12 months however. If you want any measurements/pics from them, LMK.

Nice meeting you at BC as well, great weekend for sure.....
_________________
John Henry

'57 Deluxe
'51 11E Standard Sunroof (PhotoBucket resto pics)

Martin Southwell · Posted: Thu Jun 30, 2011 11:21 am Post subject: 25hp Pistons

Hello again - Pictures would be good, even though I do have a set myself. You can't have too much information!

Nice to meet up with you and one hundred others. Didn't the time fly by?

Enfo · Posted: Thu Jun 30, 2011 12:17 pm Post subject:

I've got a feeling that MK1 Polo pistons are interchangeable, have a Google I'm sure you'll find something.

Enfo · Posted: Thu Jun 30, 2011 12:26 pm Post subject:

These pistons can be used in place of 25 horse ones, supposedly.
AUDI Fox 1.3 09.1978 00.1981 FY B 40 54

Enfo · Posted: Thu Jun 30, 2011 12:27 pm Post subject:

These pistons can be used in place of 25 horse ones, supposedly.

Whatsthatsmoke · Posted: Thu Jun 30, 2011 12:41 pm Post subject:

http://www.oldtimer-motorenteile.com/index.php?cat=c1078_VW-Derby-1-3---77---7-79.html

Martin Southwell · Posted: Thu Jun 30, 2011 12:43 pm Post subject: Where can I buy one of these?

Thanks for that info. Any idea where I can buy one to compare? These can't be easy to locate these days? When did you last see a Mk1 Polo on the road?

Martin Southwell · Posted: Thu Jun 30, 2011 12:53 pm Post subject: Similar, but not the same

Thanks again for that info. This German web-site doesn't have any 25hp pistons, and the 1300 Polo pistons are 75mm diameter, but too short in length - 66.6mm instead of 80mm. The pin diameter is the same at 20mm, so could be used at a push.

Standard Diameter : 75 mm
Compression Height : 38,7 mm
Piston Lenght : 66,6 mm
Pin Diameter : 20 mm

Martin Southwell · Posted: Thu Jun 30, 2011 1:04 pm Post subject: How much?

Just been back on the site, and for 4 Polo pistons the cost before shipping is 476 euros! This being the case, my manufacturing intentions are still a viable option!

tstracy39 · Posted: Thu Jun 30, 2011 1:32 pm Post subject:

Can you make a few aluminum cases and cylinder heads while you're at it please.
_________________
Check my classifieds for kewl gauges:

http://www.thesamba.com/vw/classifieds/search.php?username=tstracy39

nlorntson · Posted: Thu Jun 30, 2011 8:05 pm Post subject:

Did anything come of this post?

http://www.thesamba.com/vw/forum/viewtopic.php?t=4...ght=piston

Standardfahrer · Posted: Fri Jul 01, 2011 2:29 am Post subject:

Here you can get a set (4pcs) for 250,-€.

http://cgi.ebay.de/Kolben-Audi-50-VW-Polo-1300N-NE...1c1cc0db87

I have a set in my split since 2003isch and no problems since then.

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

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

Marcus

Martin Southwell · Posted: Fri Jul 01, 2011 11:12 am Post subject: Interesting

Thanks for this info. How common are these early Polo pistons? I guess they can't be that common these days. Does this seller have plenty of stock? Would it make having 25hp pistons manufactured a non starter?

The earlier query about whether a former thread had come to anything can be seen by looking at the American sellers web-site, which shows that they have none in stock.

geneL3c · Posted: Fri Jul 01, 2011 5:47 pm Post subject:

Martin ,

I was in the same situation when rebuilding my 25HP several years ago , trying to find a usable STD cyl & pist assembly . I was able to find STD pistons , but not cylinders .

After purchasing several " serviceable " cylinders that were all unusable , I decided to have ALL the cylinders bored to first oversize and have pistons made , after talking to Venolia Piston in California .

They made four new pistons , for under $300.00 ( without wrist pins ) and Rimco , also in California bored the cylinders and fitted the new pistons .

New rings were found although I can't recall price or supplier ( might have been Wolfsburg West ) .

Hope this is of some help , Gene

tstracy39 · Posted: Sat Jul 02, 2011 12:00 am Post subject:

Is there no one casting standard size cylinders nowadays? There might be a warmer market with casting new cylinders. Out of all the parts that get extracted from old 25 horse engines, the cylinders are the ones that tend to be rusted up tight and often break when they're pried out.
_________________
Check my classifieds for kewl gauges:

http://www.thesamba.com/vw/classifieds/search.php?username=tstracy39

geneL3c · Posted: Sun Jul 03, 2011 1:50 pm Post subject:

It would seem to me that there is a market for 25 HP cylinder barrels since , as has been already said , most originals either do not survive the disassembly process or are rusted and/or scored . Most pistons I have come across however are NOS or used , serviceable . It had been recommended to me at one point to rebore the case and heads for 36 HP which are still available , but cutting an original all aluminum case and heads seemed to be sacrilege .

RichOakley · Posted: Sun Jul 03, 2011 2:01 pm Post subject: Re: Where can I buy one of these?

Splitdog · Posted: Sun Jul 03, 2011 2:32 pm Post subject:

You also have pin location to worry about. I would do the 36hp option. Is there any way to tell?
_________________
CH3NO2.

Der Blitzkrieg Kafers

Martin Southwell

I heard back this week from the maufacturer, who will produce 25hp pistons for me, but quoted for a set of 4! I've explained that I initially require 25 sets (100) and want a price for this quantity, and they still have to get back to me.

Still have to decide what size to produce initially. 2nd oversize is the favourite option to begin with. Watch this space.

>Help >Donate >Buy Shirts >Register >Log in	See all Samba banner ads \| Advertise on TheSamba.com

Forum Index -> Beetle - Split-Window/1938-53 VWs		Share:
		Print View

	Forum Index -> Beetle - Split-Window/1938-53 VWs	All times are Mountain Standard Time/Pacific Daylight Savings Time Goto page 1, 2 Next
Page 1 of 2