Lotus Europa Community
Lotus Europa Forums => Garage => Topic started by: LotusJoe on Monday,October 12, 2015, 12:24:27 PM
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I'm looking for the bore size on the various Europas. I found in the workshop manuals that the TwinCam uses a master that is .875 inches. I recall that the S-2s used a .70 bore, but I can not find any reference in the manuals. Does anyone know the size on the S2s?
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http://www.parts.banks-europa.co.uk/display_photo.php?296
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Thanks for the reference. I'm looking for confirmation on the size of a non-servo tandem master for an S-2
(http://www.lotuseuropa.org/gallery/albums/album13/S_2_master.sized.jpg)
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I think the UK TC also had a 0.7" bore, mine did when I first got it and there was nothing in the history to say it had been replaced. I used a 0.75" single circuit one for a while with the standard brakes and servo, which had a shorter travel.
When I was doing some research for my dual circuit system I looked up the Triumph Spitfire range because they had the same front calipers and no servo and came up with the data I've tagged on here. It was quite interesting to see what was fitted and taken as acceptable ratios of m/cyl bore to caliper/drum piston sizes.
Basically they had similar disc/drum brakes without servo and used a range of master cylinder bores from 0.625" through to 0.7" with 0.75" on the last GT6 cars, which I think included a servo as standard. (not sure on that one)
Brian
Edit to add - Looking at your post I'm wondering if a 5/8" master was fitted to the early non-servo cars ? A vague recollection and I could be getting confused with early non-servo Elans but the theory used to be that adding a servo meant a bigger bore and non-servo cars had smaller bores so you had less pedal pressure (but longer travel)
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Joe,
To answer your question;
.700 for an S2
.875 for a TC/Special
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Joe,
To answer your question;
.700 for an S2
.875 for a TC/Special
Thank You :beerchug:
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I have several spare MCs that I thought were for a S2. Four measure approx. 0.86" on the rear most bore (I don't have a bore gauge to measure the front bore). The other two measures 0.69". It now looks like the four with the 0.86" bore is for a TC. The numbers cast into the body also seem to pretty consistent on the application.
TCs are numbered: G 64676717 0(x)
S2s are numbered: G 64676597 03(x)