From:Chris Newbold e-mail:Chris@cgn-ltd.co.uk
Subject:RE: RE: RE: RE: RE: Ace pistons Date:Mon Apr 21 02:38:09 2014
Response to:5135

Thanks Doug I have e mailed Egge and will await their reply it's just the
engine is fitted with the wrong piston so I had nothing to use as a guide. I
will see Ken today at a bike jumble he is a great help and he rides a lot like
us.

Chris
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Egge has made pistons for Ace, taken from my NOS alloy
pistons.
ACEdoug

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Hello Chris ,two sugars please !! hope to be there on my
Indian ACE , did 165miles on it yesterday , running nice and
stopping now after relined bands due to right side going
awol last weekend !! good fun riding home !! relying on left
heel brake and left toe clutch !! Best of luck , Ken

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Ken your a bloody hero I can now forward that onto our
supplier, are you
going to Ashford on Monday buy you a large tea. The problem
I had was
Nicks engine was fitted with pistons from an Austrian
compressor of course
the we're never made to take combustion temperatures hence
there
destruction in 1.5 hours.

Many thanks Ken

Chris
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Hello Chris ,
I have the old pistons frrom my Ace which are cast iron
and they
measure 3-1/4 inches O/A height , 1.4 inches compression
height
I would give 8thou clearance (saves some running in) or
6thou and
run in for 500miles , although take it easy for a few
hundred anyway
the weight is 7.85 ounces .
I used Harley (sorry) 45 pistons which are nearly 3
ounces heavier
standard but had to take 0.90thou of the crown to get
compression
right and make bronze bushes for the gudgeon pins . I used
the 45
pistons that take the inner circlip not the ones where the
gudgeon pin
takes the circlip . Although the 45 pistons are only 2-
7/8ths high , I
haven't had any problems in about 7,000miles . I believe
Egge M/Co
used to supply Pistons for Indian Fours and possibly ACE but
not sure
if they still do , part number 1307 see -
http://www.egge.com/
Hope this is a bit helpful , best of luck , keep us informed
and don't
forget to keep - https://groups.yahoo.com/neo/groups/Ace-
fourcylinders/info
informed too , also might get more help there !!
Ken

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Could anybody help with the following please

We have a 1922 ace undergoing an engine rebuild require the
following
information if possible

The piston diameter is 2.714 which is 1922 oversize

Require
Overall height of piston from skirt to crown
Target weight of piston without rings and pin
Compression height ( centre of pin to crown )
Piston to bore clearance

Many thanks

Chris