OzVMX Forum

Clubroom => General Discussion => Topic started by: Doc on October 15, 2007, 04:51:55 pm

Title: Wiseco sizes
Post by: Doc on October 15, 2007, 04:51:55 pm

Not being a wiseco man could someone enlighten me as to the sizing. Would I be assuming correctly if I figured 20thou over (P2) would be 0.50mm, 40thou (P4) 1mm over, 60thou (P6) 1.50mm and P8 or 80thou would be 2mm  ???

Could someone confirm if my assumptions are correct? Thanks

Title: Re: Wiseco sizes
Post by: oldfart on October 15, 2007, 05:28:29 pm

Doc
       Go to the bottom of the serco site .....It explains it in there somewhere.
I have sent you an email to their site             poxy security settings will not allow me to down load the file      ah humbug

Title: Re: Wiseco sizes
Post by: Doc on October 15, 2007, 05:51:42 pm

I s'pose I shoulda thought to look there  ::) thanks Stew. I got a bargain on ebay and i just wanna make doubly sure I haven't fouled things up as this luck doesn't come my way too often  ;D I emailed the PDF wiseco catalogue to you last night  ;)

Title: Re: Wiseco sizes
Post by: Doc on October 15, 2007, 06:49:16 pm

hmmm.. :-\ I couldn't find the specific details I require on the Serco site oldfart. Not to worry, I'm hoping my math is still okay cause I work it out to about 20thou =  0.508mm so a P6 kit would be 1.524mm over :P math was never one of my strong points  ::)

Title: Re: Wiseco sizes
Post by: Lozza on October 15, 2007, 08:01:48 pm

100% correct Doc......but there are 2 schools of measurement first is 40thou per mm the other is 39thou per mm. ;D ;D

Title: Re: Wiseco sizes
Post by: Nathan S on October 15, 2007, 08:04:42 pm

If you had two pistons for the same engine, and one was 0.040" oversize, and the other was 1.00mm oversize, I'd bet that they were the exact same size (allowing for manufacturing tolerances, of course).

Title: Re: Wiseco sizes
Post by: pokey on October 15, 2007, 08:08:24 pm

http://en.wikipedia.org/wiki/Drill_bit_sizes

 Halfway down the page mate/
 is a nice already done conversion  chart

0.020 0.508

0.040 1.016

0.059 1.511

0.079 1.994

Title: Re: Wiseco sizes
Post by: LWC82PE on October 15, 2007, 08:09:25 pm

ive got an old wiseco catalogue from around 80/81 if you want to know anything in that

Title: Re: Wiseco sizes
Post by: Doc on October 15, 2007, 10:01:56 pm

Thanks ppl's  :) this is all good news regardless..my little TM which is on a well worn 1mm over now will live to play another day! ;D

I have to gloat..I picked up a P6 single ring TM Wiseco kit for $24 + $12 postage on egay. Not a soul bid except moi so what I saved pays for the boring ;D

Title: Re: Wiseco sizes
Post by: Graeme M on October 15, 2007, 10:30:34 pm

Nice pickup Doc. I wish I'd seen that, although these days I force myself to stay away from TM searches on eBay, otherwise I'll be the owner of a $10,000 TM in no time. Mind you there seems no shortage of CR pistons, I have bought several of these recently for very reasonable prices.

Title: Re: Wiseco sizes
Post by: Doc on October 15, 2007, 11:43:46 pm

don't you mean the owner of a second $10000 TM Graeme :P :D

I do normally keep an eye on TM/TS/CR piston and more often than not I'll put a token bid on if it's a lower start price and let it run. Normally these items end up in my 'Items Not Won' folder which I clear regularly (just so I don't get emotional about the things I really wanted but missed out on :'( ) but..much to my delight when I checked back on this item it wasn't where I thought it would be. more arse than class  ;)