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Richard Jemison
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Discussion Starter #1
Just profiled, large BC (1.160 which is same as Motronic intake BC) from 1.8 turbo;
Here`s the full profile:
116 1.8L Turbo Cam Data
Cam Lift Dur. at “0” lash
BC 1.160 (2mm larger than Nord 1.080)

.010 358 (large seating ramp for quietness)
.020 291
.040 242
.050 237
.080 225
.100 217
.150 198
.200 178
.250 159
.300 138
.350 113
.400 83
.450 31
.448 Max Lift 11.65 mm
 

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Nice work Richard :D

You'll have to excuse my ignorance, but camshaft profiles always cause my brain to overload :confused:

11.65mm of lift seems like a decent amount for a factory cam.
I've read a few times that any more than 25% of valve diameter for the lift figure is not worth it. Is that the case, because that has the 80mm bore 1.8 at 46.6mm (or there abouts), which sounds to big for standard?
 

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Don't some consider this information "Not for release to the general public."?
Interesting cam. What applications would it best fit? Did it have a factory number?
 

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Stock 75 1.8T has #116990320000 intake and 105200320000 exhaust cams.
Interestingly enough, the intake is the same as the ancient 1300 cam #101000320000, but with an oiling groove in the front journal. Cam lift 8.6mm and 217* @ 1.25mm. You may also remember the exhaust cam as being a Spica cam, with 9.6mm lift and 222* @ 1.25mm! This was Alfa performance thinking regarding their first mass-produced turbo engine back in 1986.
Oh, I forgot...Lobe centers are 97* and 114*.
Jim K.
 

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Thanks Jim! Nothing ever completely new with the odd Alfa stuff. Great history.
 

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Richard Jemison
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Discussion Starter #6 (Edited)
Factory Turbo Cam

This is later stock Alfa cam, casting # 116550320008 as delivered to Australia. Large intake BC as provided in 1990 & later engines.
 

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The last few units of the 75 1.8T model were produced in early 1992. Since April 1990 the engine code became 61203 from the previous 6134. The engine differences introduced (in the so-called QV or Potenziato edition) were the adoption of the 2-plane exhaust manifold (of Evoluzione origin) the intake temperature sensor on the rear of the intercooler and power steering. Everything else in the engine remained the same. A revised ignition advance curve considering intercooled air tempeature, resulted in 165hp according to Alfa. A popular misconception is that these later cars were cat-equipped but this is not true. No 1.8T's were ever made for unleaded fuel or cats for any one of the few markets they were sold in.
Btw, Evoluzione engines (code 6158) were different than 6134 units, having thicker main bearing caps, a beefier block, 2-plane exhaust manifold and 79.6mm bore instead of 80mm, for a total volume of 1762cc. This was done for homologation purposes. In 1987 the turbo multiplier was 1.7; using the smaller bore (79.6mm) they could compete in the under-3liter class as 1762x1.7=2996cc, while the std 1779cc engine would put them over the 3liter limit. Evo cars also had 155hp (same as the 6134 engines) in spite of what various sources have claimed throughout the years. Note I am only referring to engine differences here.
Jim K.
 

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Richard, I apologize profusely for (briefly) stealing your thread - though this is directed to you (and Jim K. should he care to comment). I'll move it very quickly to its own thread if it goes beyond a post or two.

I want to slightly warm up a 2000 TS, but keeping the Motronic, before installing it in my early Alfetta GT. Since I know it has been done, I would like to get a fairly warm inlet street cam, which retains the VVT. I'll add that I'll also install 10.5:1 pistons (and yes, Richard, I know your feelings of installing Nord rods instead but feel 11:1 is too much for a daily driver street car).

Can you help me with a VVT inlet cam?

Biba
 

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This is later stock Alfa cam, casting # 116550320008 as delivered to Australia. Large intake BC as provided in 1990 & later engines.
The only 1.8T 75 in Australia was a Factory Group A racer that got written off.
 

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Richard Jemison
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Discussion Starter #11
Cams

The only 1.8T 75 in Australia was a Factory Group A racer that got written off.
I suppose my customer should have consulted you before buying, Huh:rolleyes:

Can you help me with a VVT inlet cam?
Biba, I can furnish several profiles,and have a separate listing for TS cams, which has been sent to you. However only changing one cam does not address the issue of PROPER exhaust timing which is as important as the intake cam. however as TS cores are not available and it will have to be built using your core.
 

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LHD markets, as there was no RHD ever made.
Yes, the engine is a 105 Nord with several necessary changes. Its impressive that they will withstand up to ~500hp with stock internals!
Jim K.
 
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