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Thank you for your answers . I have not a piston problem , my company is making pistons . But I got the info some days ago from a forum member the the Polo pistons fit the t37 - T40 . But I was not able to find any volkswagen piston in my piston catalogs for this cars .
Because I have a company a Polo piston cost me only 50 € , in this case I would buy them and save the time to make them . Desiderata , I am in the lucky position , that we can make anything , from pistons to crankshafts and complete engines . So I must not buy anything in england , but I know what you are talking about .
I am building a t40 engine unblown and will raise the compresion high about 3mm .I hope I can bring this engine from running like a steam engine into a combustion engine .

Author:	Udolahr [ Sun Jun 26, 2011 7:40 pm ]
Post subject:	Pistons T37
what about the story, Volkswagen Golf pistons for a T37 - T40 ? I can not find a Volkswagen piston with the correct compression height, diameter and piston pin diameter . Do I need to ask Little Red Riding Hood or the Wolf ?

Author:	Herman [ Sun Jun 26, 2011 7:42 pm ]
Post subject:	Re: Pistons T37
Perhaps they can only be used as blanks? (so they need rework)

Author:	Udolahr [ Sun Jun 26, 2011 8:53 pm ]
Post subject:	Re: Pistons T37
The only Volkswagen I found has diameter 70mm , piston pin 20mm and compression height 40mm with a recess 4mm . And who can machine a piston ?

Author:	37quest [ Sun Jun 26, 2011 9:03 pm ]
Post subject:	Re: Pistons T37
I think you are confusing your volkswagens! VW polo pistons were very commonly used before the UK restorers started making proper replacements, however they are far from like for like and a 37 engine still using 1970s polo pistons is likely to be slow. 1970's polo pistons supplies dried up as very few are now needed hence making proper ones.

Author:	Udolahr [ Sun Jun 26, 2011 9:55 pm ]
Post subject:	Re: Pistons T37
so there is no real Volkswagen replacement for a T37 piston , better to make new pistons .

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Author:	37quest [ Mon Jun 27, 2011 12:20 pm ]
Post subject:	Re: Pistons T37
Hi Udo the polo pistons only really worked in blown cars as the crown hight was lower hence a lot of unblown cars chugging around, the BOC now make T37 pistons suitable for a blown car ie slightly lower compression ratio. However if you want a specific hight for an unblown car talk to Malcolm at Gentry restorations though not listed on there web site they make them to your specific spec: http://www.gentryrestorations.co.uk/par ... ype=engine

Author:	Desiderata [ Mon Jun 27, 2011 1:43 pm ]
Post subject:	Re: Pistons T37
When dealing with the Bugatti specialists in England it is well worth shopping around. From personal experience some are exorbitantly expensive, unreliable, dishonest or a combination of all three. However, have found Robin Townsend (not sure of spelling) to be the best informed about the type 37/40 engine. He was conveniently based near Prescott.

Author:	Udolahr [ Mon Jun 27, 2011 8:20 pm ]
Post subject:	Re: Pistons T37
Thank you for your answers . I have not a piston problem , my company is making pistons . But I got the info some days ago from a forum member the the Polo pistons fit the t37 - T40 . But I was not able to find any volkswagen piston in my piston catalogs for this cars . Because I have a company a Polo piston cost me only 50 € , in this case I would buy them and save the time to make them . Desiderata , I am in the lucky position , that we can make anything , from pistons to crankshafts and complete engines . So I must not buy anything in england , but I know what you are talking about . I am building a t40 engine unblown and will raise the compresion high about 3mm .I hope I can bring this engine from running like a steam engine into a combustion engine .

Author:	Bugwrench [ Wed Jun 29, 2011 7:38 pm ]
Post subject:	Re: Pistons T37
Udolahr wrote: Thank you for your answers . I have not a piston problem , my company is making pistons . But I got the info some days ago from a forum member the the Polo pistons fit the t37 - T40 . But I was not able to find any volkswagen piston in my piston catalogs for this cars . Because I have a company a Polo piston cost me only 50 € , in this case I would buy them and save the time to make them . Desiderata , I am in the lucky position , that we can make anything , from pistons to crankshafts and complete engines . So I must not buy anything in england , but I know what you are talking about . I am building a t40 engine unblown and will raise the compresion high about 3mm .I hope I can bring this engine from running like a steam engine into a combustion engine . In the past there were two types of VW Polo pistons, one with a C/H 47mm and suitable for the T37-40 engine and another one with 40.35mm C/H which was suitable for the Brescia. These flat top pistons produced by Mahle and KS were absolute top quality and were a direct fit with 20mm gudgeon pins and three sizes Ø69.51,70.51 and 70.51. KS reference is 93 157 600. As building a proper engine in most cases means new conrods the correct C/R was chosen by fitting longer rods. A Polo piston and 204mm rod gives a C/R around 8.1 and most times higher as the crankcase has usually been skimmed more than once. Bugwrench

Author:	Udolahr [ Sun Jul 03, 2011 1:35 pm ]
Post subject:	Re: Pistons T37
I found the Volkswagen pistons with 69,5mm in a old mahle catalog from 1993 . It looks to me like a compromise . And because I already did make the chill mould for the pistons , I make new pistons and do not change the con rods . To bad that I can not use the 37 mould for the brescia , so need to make a second one .

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