Ti rebuild decisions

[Joesprocket]

Hey there - I’m in the middle of an engine rebuild and have some decisions to make in terms of if I want to go back stock vs a ti homage. 
 

for starters my car is a 2002 late 68 build. 121ti head. I’ll most likely be going back with 90mm bathtub pistons 10:1. 
 

aside from side draft carbs (Weber or Solex) what else in terms of the block and head would need to be true. Did the ti have a more aggressive cam profile than that of stock 2002? Maybe different valves or header? 
 

I’ve read so much positive reviews of the OG Solex 36/40 PDSIT which I have and could rebuild

 

i enjoy spirited driving with both open and twisty roads but not track worthy

Edited February 7 by Joesprocket

[Jam3422]

The stock ti spec was pretty straightforward - 9.3:1 mahle pistons, dual solex 40 phh carbs, stock cam (264).  The BMW 300 cam was an option.  When I rebuilt the engine in my ti a few years ago, I stuck with the original specs as above, though I did use the 300 cam and slightly larger valves. 

 

If you are doing a ti tribute, you gotta go with the phhs, nothing else looks right.  Just my opinion of course.  

[Joesprocket]

I’ve been cruising the classifieds and eBay looking for the Solex PHHs and no luck so far. Would I need to make any modifications to my 121 ti head or is there a manifold involved at all or just bolt on? 
 

thanks again for this 

[Jam3422]

Bathtubs are correct for the 121 head, so no modification unless you go with the 300 cam - it has larger journals than the stock cam.

 

Yes, you would need a manifold for the sidedrafts, either the BMW version, or an aftermarket.  If you decide to find phhs, be aware that almost all of them for sale are for an NK, either the 1800ti or the 2000.  You can make them work, but they are different than the 2002ti version.

 

There is a ton of info about these topics here on the faq, just do a search.

[jgerock]

If you are building an engine, buy a Schrick 292 cam for an engine with dual sidedraft carburetors.  Replace all worn out cylinder head components.

[Joesprocket]

Thanks @jgerock yes the head is being rebuilt as well. I’m assuming you’re suggesting this to add to the fun factor.  does a 292 mean also different valves, dizzy or exhaust header. Or can that stay stock. Making sure I understand cause and effect. 

[jgerock]

22 hours ago, Joesprocket said:

Thanks @jgerock yes the head is being rebuilt as well. I’m assuming you’re suggesting this to add to the fun factor.  does a 292 mean also different valves, dizzy or exhaust header. Or can that stay stock. Making sure I understand cause and effect. 

My engine is basically stock tii spec.      123 dizzy, tii exhaust manifold, freshened 121 head, Schrick 292 cam.

 

edited- I also have the single Schrick HD valve springs

Edited February 8 by jgerock

[Bassie81]

You don’t need differente valves. You might want to upgrade your valve springs (schrick has a nice set heavy duty valve springs that are not to expensive) to cope with higher revs a 292 will invite you to.

 

With the 292 cam I would recommend getting a exhaust header to pair. But many seem happy with the tii header.

 

I will follow this topic as I plan to rebuild the engine for my mid ‘68 2002. 

Edited February 7 by Bassie81

[Oldtimerfahrer]

The phh Solex's were not the first choice of in period mods, but drive well and look right if originality is the goal. I shelved mine and went with DCOE's, but kept the stock air can setup...I find pancake and other  filters change the look more than solex vs weber. If you do want to dial your carbs in for the compression, camshaft, etc. the weber jetting options are bountiful, not to speak of choke sizes and trumpets to expand or reduce the cross section of the carbs or length of the intake tract. Not many restore the solex's, not sure what is available on jetting and chokes but I am sure some members here would know.

Andrew

[Jeff]

The Schrick 292 or even 304 camshafts with upgraded valve springs should be considered. If keeping the Solex PHH carburetors  jetting is available from ebay seller Alfa 1750's page    https://www.ebay.com/str/alfa1750scarburetorspartsstore?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=gfBdhOfJRLy&sssrc=3418065&ssuid=rKbkfAjKQs6&widget_ver=artemis&media=COPY 

I would also consider lighting the stock flywheel some, not too much. Many of the aftermarket aluminum flywheels are too light in my opinion for a street car. The lighter flywheel will make the engine much more responsive and Rev quicker. Make sure the Distributer is rebuilt with new bushings and drive gear. The Solex PHH Carburetors should be completely rebuilt with new throttle shaft bushings and throttle blades, if the Bores on the carburetors are worn, they must be line bored and oversized throttle blades installed.

 

-Jeff