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Date: 6-24-08 01:42
From: NickVyse in Provence, France  
Subject: New Tii for my next M2 project. e12/e121 head question..  
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It's complete, but for complete restoration. Question - is the early intake design (plastic intake runners) noticeably better than the late style? I've also read that the e12 head is little better in reality over the later e121 - but can someone enlighten me whether it's the pistons in this earlier engine that raise the compression ratio or whether it's the head?
Just running through options as the car comes with 2 early style Tii engines.
Best thing about the car - it's in Corsica, so I need a holiday to pick it up. _________________ 1973 m2 Touring - RHD. Asleep dreaming of a new body
1967 1600-2 LHD. Daily use
1967 1600-2 LHD. Parts car
1972 2002Tii LHD. Resto project
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Date: 6-24-08 03:49
From: wegweiser
Subject: Re: New Tii for my next M2 project. e12/e121 head question..
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Hey Nick,
A good friend of mine just returned from Corsica...you'll love it! ...and if this car was driven in Paris (noting the awesome decal!) then it has truly had the shit kicked out of it.....and that's glorious in "real sportscar" kinda way!
I have always....ALWAYS preferred the early tii runners, head, and compression ratio over the later cars. Early cars with plastic runners nearly ALL should have "121ti" heads...which are interchangeable with "121". the "ti" isn't anything special unique to the tii. Later tiis (mid 72 on) should all have "E12" casting heads. The pistons are not interchangeable, but builders can get equal power from either head/piston combo if tweaked / modified properly.
Why do I like the early cars?
less weight
higher compression (Euro spec were 10:1!!!)
awesome "prototype" look to the plastic runners - almost "experimental" in appearance. Sure you have to replace O rings every 5-10 years, and they CAN crack with age...but those are special cars to me. A 10:1 spec early tii is a completely different driving experience from even a later round light (let's say late 72 - 73) car. ....and the 74 US cars feel like luxury vehicles by comparison... far more refined, but heavier and FAR slower.
I'm all about the visceral with these cars. Noise/smells/aching limbs...all of it...maybe that's why I like inefficient, stinky, gulping, deafening, Webers.
Paul Wegweiser
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Date: 6-24-08 08:39
From: 02fanatic in Pennsylvania
Subject: I agree with you Paul.....
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This is exactly why I "Saved" Hugo tii #129! Gotta love them early tii's!
John _________________ Mit freundlichen Grüßen
John Weese
'72tii "Hugo"
'73tii "Atlantik"
'74 '02 "Inka"
'76 '02 "Malaga"
'72tii engine VIN 2760081 - waiting on a rebuild
"Keep your revs up and watch your mirrors!"
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Date: 6-25-08 12:42
From: NickVyse in Provence, France
Subject: Re: New Tii for my next M2 project. e12/e121 head question..
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| wegweiser wrote: | Hey Nick,
A good friend of mine just returned from Corsica...you'll love it! ...and if this car was driven in Paris (noting the awesome decal!) then it has truly had the shit kicked out of it.....and that's glorious in "real sportscar" kinda way! |
My parts car from the South-West of France has the same Paris sticker - and good old Andreas at Mobile Tradition states that all 3 of my French 02's (I've mentally taken ownership of the Tii already) were delivered to Paris. I think that all French 02's probably arrived that way.
Corsica will have to wait until next month, but it's only a short hop across the water from here. _________________ 1973 m2 Touring - RHD. Asleep dreaming of a new body
1967 1600-2 LHD. Daily use
1967 1600-2 LHD. Parts car
1972 2002Tii LHD. Resto project
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Date: 6-25-08 08:17
From: PatAllen in Quebec
Subject: Re: New Tii for my next M2 project. e12/e121 head question..
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those plastic runners are known to pop-out and/or melt when there is back fires.
the injection pump should have a different cone (v3? versus V4?)) to match the higher compression and different combustion chamber.
Different compression ratio and combustion chamber=different fueling needs.
_________________
1976 turbocharged 2002, 14psi, T3, 70%LSD, urethane bush, 36x15 intercooler, 63mm tby,SDS EM4F, 5sp overdrive. Bilsts. Tech edge wb02, datalogger, recaros.
1974 2002 auto
1992 325i
1991 318is
1985 XR4TI, 22psi
1986 Toyota pick-up
1997 Pathfinder
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Date: 6-26-08 12:23
From: NickVyse in Provence, France
Subject: Re: early tii heads all had big intake valves according to
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| wegweiser wrote: | Well I'll be a monkey's UNCLE! (avatar notwithstanding).
Indeed...my fiche jockey skills must be slipping. (it's only been a few years since I was doing this stuff daily - ugh). This sucks. How unbelieveably embarassing!
YES! BMW shows only ONE part number for the tii intake valves, regardless of VIN or cylinder head. I double checked on the valve seats, too....again - same as non tii E12 big valve heads.
So that means that 121"ti" heads all have big intakes while 121 (non "ti") heads got standard intake valves?
I guess I better shut up for a while and bathe in some humility. :-(
Paul Wegweiser |
You were confusing the hell out of me there Paul - I'd read the Tii e121 heads had the same larger valves but I was putting it down to Internet 'fact' and bowing to your superior knowledge. I'm afraid all your credibility has now been blown and I shall never believe another word you say ;-) _________________ 1973 m2 Touring - RHD. Asleep dreaming of a new body
1967 1600-2 LHD. Daily use
1967 1600-2 LHD. Parts car
1972 2002Tii LHD. Resto project
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